1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.tools;
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3 |
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4 | import static org.openstreetmap.josm.tools.I18n.tr;
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5 | import static org.openstreetmap.josm.tools.I18n.trn;
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6 |
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7 | import java.awt.Color;
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8 | import java.awt.Toolkit;
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9 | import java.awt.datatransfer.Clipboard;
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10 | import java.awt.datatransfer.ClipboardOwner;
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11 | import java.awt.datatransfer.DataFlavor;
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12 | import java.awt.datatransfer.StringSelection;
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13 | import java.awt.datatransfer.Transferable;
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14 | import java.awt.datatransfer.UnsupportedFlavorException;
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15 | import java.io.BufferedReader;
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16 | import java.io.Closeable;
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17 | import java.io.File;
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18 | import java.io.IOException;
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19 | import java.io.InputStream;
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20 | import java.io.InputStreamReader;
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21 | import java.io.OutputStream;
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22 | import java.io.UnsupportedEncodingException;
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23 | import java.net.HttpURLConnection;
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24 | import java.net.MalformedURLException;
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25 | import java.net.URL;
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26 | import java.net.URLConnection;
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27 | import java.net.URLEncoder;
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28 | import java.nio.charset.StandardCharsets;
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29 | import java.nio.file.Files;
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30 | import java.nio.file.Path;
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31 | import java.nio.file.StandardCopyOption;
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32 | import java.security.MessageDigest;
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33 | import java.security.NoSuchAlgorithmException;
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34 | import java.text.MessageFormat;
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35 | import java.util.AbstractCollection;
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36 | import java.util.AbstractList;
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37 | import java.util.ArrayList;
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38 | import java.util.Arrays;
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39 | import java.util.Collection;
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40 | import java.util.Collections;
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41 | import java.util.Iterator;
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42 | import java.util.List;
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43 | import java.util.concurrent.ExecutorService;
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44 | import java.util.concurrent.Executors;
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45 | import java.util.regex.Matcher;
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46 | import java.util.regex.Pattern;
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47 | import java.util.zip.GZIPInputStream;
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48 | import java.util.zip.ZipEntry;
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49 | import java.util.zip.ZipFile;
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50 | import java.util.zip.ZipInputStream;
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51 |
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52 | import javax.xml.XMLConstants;
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53 | import javax.xml.parsers.ParserConfigurationException;
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54 | import javax.xml.parsers.SAXParser;
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55 | import javax.xml.parsers.SAXParserFactory;
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56 |
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57 | import org.apache.commons.compress.compressors.bzip2.BZip2CompressorInputStream;
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58 | import org.openstreetmap.josm.Main;
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59 | import org.openstreetmap.josm.data.Version;
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60 | import org.xml.sax.SAXException;
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61 |
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62 | /**
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63 | * Basic utils, that can be useful in different parts of the program.
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64 | */
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65 | public final class Utils {
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66 |
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67 | public static final Pattern WHITE_SPACES_PATTERN = Pattern.compile("\\s+");
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68 |
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69 | private Utils() {
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70 | // Hide default constructor for utils classes
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71 | }
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72 |
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73 | private static final int MILLIS_OF_SECOND = 1000;
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74 | private static final int MILLIS_OF_MINUTE = 60000;
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75 | private static final int MILLIS_OF_HOUR = 3600000;
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76 | private static final int MILLIS_OF_DAY = 86400000;
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77 |
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78 | public static final String URL_CHARS = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-._~:/?#[]@!$&'()*+,;=%";
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79 |
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80 | /**
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81 | * Tests whether {@code predicate} applies to at least one elements from {@code collection}.
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82 | */
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83 | public static <T> boolean exists(Iterable<? extends T> collection, Predicate<? super T> predicate) {
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84 | for (T item : collection) {
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85 | if (predicate.evaluate(item))
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86 | return true;
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87 | }
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88 | return false;
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89 | }
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90 |
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91 | /**
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92 | * Tests whether {@code predicate} applies to all elements from {@code collection}.
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93 | */
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94 | public static <T> boolean forAll(Iterable<? extends T> collection, Predicate<? super T> predicate) {
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95 | return !exists(collection, Predicates.not(predicate));
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96 | }
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97 |
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98 | public static <T> boolean exists(Iterable<T> collection, Class<? extends T> klass) {
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99 | for (Object item : collection) {
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100 | if (klass.isInstance(item))
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101 | return true;
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102 | }
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103 | return false;
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104 | }
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105 |
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106 | public static <T> T find(Iterable<? extends T> collection, Predicate<? super T> predicate) {
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107 | for (T item : collection) {
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108 | if (predicate.evaluate(item))
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109 | return item;
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110 | }
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111 | return null;
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112 | }
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113 |
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114 | @SuppressWarnings("unchecked")
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115 | public static <T> T find(Iterable<? super T> collection, Class<? extends T> klass) {
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116 | for (Object item : collection) {
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117 | if (klass.isInstance(item))
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118 | return (T) item;
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119 | }
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120 | return null;
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121 | }
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122 |
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123 | public static <T> Collection<T> filter(Collection<? extends T> collection, Predicate<? super T> predicate) {
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124 | return new FilteredCollection<>(collection, predicate);
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125 | }
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126 |
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127 | /**
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128 | * Returns the first element from {@code items} which is non-null, or null if all elements are null.
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129 | * @param items the items to look for
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130 | * @return first non-null item if there is one
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131 | */
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132 | @SafeVarargs
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133 | public static <T> T firstNonNull(T... items) {
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134 | for (T i : items) {
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135 | if (i != null) {
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136 | return i;
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137 | }
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138 | }
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139 | return null;
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140 | }
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141 |
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142 | /**
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143 | * Filter a collection by (sub)class.
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144 | * This is an efficient read-only implementation.
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145 | */
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146 | public static <S, T extends S> SubclassFilteredCollection<S, T> filteredCollection(Collection<S> collection, final Class<T> klass) {
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147 | return new SubclassFilteredCollection<>(collection, new Predicate<S>() {
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148 | @Override
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149 | public boolean evaluate(S o) {
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150 | return klass.isInstance(o);
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151 | }
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152 | });
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153 | }
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154 |
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155 | public static <T> int indexOf(Iterable<? extends T> collection, Predicate<? super T> predicate) {
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156 | int i = 0;
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157 | for (T item : collection) {
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158 | if (predicate.evaluate(item))
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159 | return i;
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160 | i++;
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161 | }
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162 | return -1;
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163 | }
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164 |
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165 | /**
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166 | * Returns the minimum of three values.
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167 | * @param a an argument.
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168 | * @param b another argument.
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169 | * @param c another argument.
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170 | * @return the smaller of {@code a}, {@code b} and {@code c}.
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171 | */
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172 | public static int min(int a, int b, int c) {
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173 | if (b < c) {
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174 | if (a < b)
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175 | return a;
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176 | return b;
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177 | } else {
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178 | if (a < c)
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179 | return a;
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180 | return c;
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181 | }
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182 | }
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183 |
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184 | /**
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185 | * Returns the greater of four {@code int} values. That is, the
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186 | * result is the argument closer to the value of
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187 | * {@link Integer#MAX_VALUE}. If the arguments have the same value,
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188 | * the result is that same value.
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189 | *
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190 | * @param a an argument.
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191 | * @param b another argument.
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192 | * @param c another argument.
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193 | * @param d another argument.
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194 | * @return the larger of {@code a}, {@code b}, {@code c} and {@code d}.
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195 | */
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196 | public static int max(int a, int b, int c, int d) {
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197 | return Math.max(Math.max(a, b), Math.max(c, d));
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198 | }
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199 |
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200 | /**
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201 | * Ensures a logical condition is met. Otherwise throws an assertion error.
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202 | * @param condition the condition to be met
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203 | * @param message Formatted error message to raise if condition is not met
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204 | * @param data Message parameters, optional
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205 | * @throws AssertionError if the condition is not met
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206 | */
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207 | public static void ensure(boolean condition, String message, Object...data) {
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208 | if (!condition)
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209 | throw new AssertionError(
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210 | MessageFormat.format(message,data)
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211 | );
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212 | }
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213 |
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214 | /**
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215 | * return the modulus in the range [0, n)
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216 | */
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217 | public static int mod(int a, int n) {
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218 | if (n <= 0)
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219 | throw new IllegalArgumentException("n must be <= 0 but is "+n);
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220 | int res = a % n;
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221 | if (res < 0) {
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222 | res += n;
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223 | }
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224 | return res;
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225 | }
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226 |
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227 | /**
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228 | * Joins a list of strings (or objects that can be converted to string via
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229 | * Object.toString()) into a single string with fields separated by sep.
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230 | * @param sep the separator
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231 | * @param values collection of objects, null is converted to the
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232 | * empty string
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233 | * @return null if values is null. The joined string otherwise.
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234 | */
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235 | public static String join(String sep, Collection<?> values) {
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236 | CheckParameterUtil.ensureParameterNotNull(sep, "sep");
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237 | if (values == null)
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238 | return null;
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239 | StringBuilder s = null;
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240 | for (Object a : values) {
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241 | if (a == null) {
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242 | a = "";
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243 | }
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244 | if (s != null) {
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245 | s.append(sep).append(a.toString());
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246 | } else {
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247 | s = new StringBuilder(a.toString());
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248 | }
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249 | }
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250 | return s != null ? s.toString() : "";
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251 | }
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252 |
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253 | /**
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254 | * Converts the given iterable collection as an unordered HTML list.
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255 | * @param values The iterable collection
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256 | * @return An unordered HTML list
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257 | */
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258 | public static String joinAsHtmlUnorderedList(Iterable<?> values) {
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259 | StringBuilder sb = new StringBuilder(1024);
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260 | sb.append("<ul>");
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261 | for (Object i : values) {
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262 | sb.append("<li>").append(i).append("</li>");
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263 | }
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264 | sb.append("</ul>");
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265 | return sb.toString();
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266 | }
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267 |
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268 | /**
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269 | * convert Color to String
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270 | * (Color.toString() omits alpha value)
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271 | */
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272 | public static String toString(Color c) {
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273 | if (c == null)
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274 | return "null";
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275 | if (c.getAlpha() == 255)
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276 | return String.format("#%06x", c.getRGB() & 0x00ffffff);
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277 | else
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278 | return String.format("#%06x(alpha=%d)", c.getRGB() & 0x00ffffff, c.getAlpha());
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279 | }
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280 |
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281 | /**
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282 | * convert float range 0 <= x <= 1 to integer range 0..255
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283 | * when dealing with colors and color alpha value
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284 | * @return null if val is null, the corresponding int if val is in the
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285 | * range 0...1. If val is outside that range, return 255
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286 | */
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287 | public static Integer color_float2int(Float val) {
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288 | if (val == null)
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289 | return null;
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290 | if (val < 0 || val > 1)
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291 | return 255;
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292 | return (int) (255f * val + 0.5f);
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293 | }
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294 |
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295 | /**
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296 | * convert integer range 0..255 to float range 0 <= x <= 1
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297 | * when dealing with colors and color alpha value
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298 | */
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299 | public static Float color_int2float(Integer val) {
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300 | if (val == null)
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301 | return null;
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302 | if (val < 0 || val > 255)
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303 | return 1f;
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304 | return ((float) val) / 255f;
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305 | }
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306 |
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307 | public static Color complement(Color clr) {
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308 | return new Color(255 - clr.getRed(), 255 - clr.getGreen(), 255 - clr.getBlue(), clr.getAlpha());
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309 | }
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310 |
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311 | /**
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312 | * Copies the given array. Unlike {@link Arrays#copyOf}, this method is null-safe.
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313 | * @param array The array to copy
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314 | * @return A copy of the original array, or {@code null} if {@code array} is null
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315 | * @since 6221
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316 | */
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317 | public static <T> T[] copyArray(T[] array) {
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318 | if (array != null) {
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319 | return Arrays.copyOf(array, array.length);
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320 | }
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321 | return null;
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322 | }
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323 |
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324 | /**
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325 | * Copies the given array. Unlike {@link Arrays#copyOf}, this method is null-safe.
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326 | * @param array The array to copy
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327 | * @return A copy of the original array, or {@code null} if {@code array} is null
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328 | * @since 6222
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329 | */
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330 | public static char[] copyArray(char[] array) {
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331 | if (array != null) {
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332 | return Arrays.copyOf(array, array.length);
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333 | }
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334 | return null;
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335 | }
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336 |
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337 | /**
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338 | * Copies the given array. Unlike {@link Arrays#copyOf}, this method is null-safe.
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339 | * @param array The array to copy
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340 | * @return A copy of the original array, or {@code null} if {@code array} is null
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341 | * @since 7436
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342 | */
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343 | public static int[] copyArray(int[] array) {
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344 | if (array != null) {
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345 | return Arrays.copyOf(array, array.length);
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346 | }
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347 | return null;
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348 | }
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349 |
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350 | /**
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351 | * Simple file copy function that will overwrite the target file.
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352 | * @param in The source file
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353 | * @param out The destination file
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354 | * @return the path to the target file
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355 | * @throws IOException if any I/O error occurs
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356 | * @throws IllegalArgumentException if {@code in} or {@code out} is {@code null}
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357 | * @since 7003
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358 | */
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359 | public static Path copyFile(File in, File out) throws IOException {
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360 | CheckParameterUtil.ensureParameterNotNull(in, "in");
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361 | CheckParameterUtil.ensureParameterNotNull(out, "out");
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362 | return Files.copy(in.toPath(), out.toPath(), StandardCopyOption.REPLACE_EXISTING);
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363 | }
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364 |
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365 | /**
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366 | * Recursive directory copy function
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367 | * @param in The source directory
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368 | * @param out The destination directory
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369 | * @throws IOException if any I/O error ooccurs
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370 | * @throws IllegalArgumentException if {@code in} or {@code out} is {@code null}
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371 | * @since 7835
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372 | */
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373 | public static void copyDirectory(File in, File out) throws IOException {
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374 | CheckParameterUtil.ensureParameterNotNull(in, "in");
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375 | CheckParameterUtil.ensureParameterNotNull(out, "out");
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376 | if (!out.exists() && !out.mkdirs()) {
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377 | Main.warn("Unable to create directory "+out.getPath());
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378 | }
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379 | for (File f : in.listFiles()) {
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380 | File target = new File(out, f.getName());
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381 | if (f.isDirectory()) {
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382 | copyDirectory(f, target);
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383 | } else {
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384 | copyFile(f, target);
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385 | }
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386 | }
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387 | }
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388 |
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389 | /**
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390 | * Copy data from source stream to output stream.
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391 | * @param source source stream
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392 | * @param destination target stream
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393 | * @return number of bytes copied
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394 | * @throws IOException if any I/O error occurs
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395 | */
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396 | public static int copyStream(InputStream source, OutputStream destination) throws IOException {
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397 | int count = 0;
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398 | byte[] b = new byte[512];
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399 | int read;
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400 | while ((read = source.read(b)) != -1) {
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401 | count += read;
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402 | destination.write(b, 0, read);
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403 | }
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404 | return count;
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405 | }
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406 |
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407 | /**
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408 | * Deletes a directory recursively.
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409 | * @param path The directory to delete
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410 | * @return <code>true</code> if and only if the file or directory is
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411 | * successfully deleted; <code>false</code> otherwise
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412 | */
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413 | public static boolean deleteDirectory(File path) {
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414 | if( path.exists() ) {
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415 | File[] files = path.listFiles();
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416 | for (File file : files) {
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417 | if (file.isDirectory()) {
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418 | deleteDirectory(file);
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419 | } else if (!file.delete()) {
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420 | Main.warn("Unable to delete file: "+file.getPath());
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421 | }
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422 | }
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423 | }
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424 | return path.delete();
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425 | }
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426 |
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427 | /**
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428 | * <p>Utility method for closing a {@link java.io.Closeable} object.</p>
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429 | *
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430 | * @param c the closeable object. May be null.
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431 | */
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432 | public static void close(Closeable c) {
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433 | if (c == null) return;
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434 | try {
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435 | c.close();
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436 | } catch (IOException e) {
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437 | Main.warn(e);
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438 | }
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439 | }
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440 |
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441 | /**
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442 | * <p>Utility method for closing a {@link java.util.zip.ZipFile}.</p>
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443 | *
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444 | * @param zip the zip file. May be null.
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445 | */
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446 | public static void close(ZipFile zip) {
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447 | if (zip == null) return;
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448 | try {
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449 | zip.close();
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450 | } catch (IOException e) {
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451 | Main.warn(e);
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452 | }
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453 | }
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454 |
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455 | /**
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456 | * Converts the given file to its URL.
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457 | * @param f The file to get URL from
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458 | * @return The URL of the given file, or {@code null} if not possible.
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459 | * @since 6615
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460 | */
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461 | public static URL fileToURL(File f) {
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462 | if (f != null) {
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463 | try {
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464 | return f.toURI().toURL();
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465 | } catch (MalformedURLException ex) {
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466 | Main.error("Unable to convert filename " + f.getAbsolutePath() + " to URL");
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467 | }
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468 | }
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469 | return null;
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470 | }
|
---|
471 |
|
---|
472 | private static final double EPSILON = 1e-11;
|
---|
473 |
|
---|
474 | /**
|
---|
475 | * Determines if the two given double values are equal (their delta being smaller than a fixed epsilon)
|
---|
476 | * @param a The first double value to compare
|
---|
477 | * @param b The second double value to compare
|
---|
478 | * @return {@code true} if {@code abs(a - b) <= 1e-11}, {@code false} otherwise
|
---|
479 | */
|
---|
480 | public static boolean equalsEpsilon(double a, double b) {
|
---|
481 | return Math.abs(a - b) <= EPSILON;
|
---|
482 | }
|
---|
483 |
|
---|
484 | /**
|
---|
485 | * Copies the string {@code s} to system clipboard.
|
---|
486 | * @param s string to be copied to clipboard.
|
---|
487 | * @return true if succeeded, false otherwise.
|
---|
488 | */
|
---|
489 | public static boolean copyToClipboard(String s) {
|
---|
490 | try {
|
---|
491 | Toolkit.getDefaultToolkit().getSystemClipboard().setContents(new StringSelection(s), new ClipboardOwner() {
|
---|
492 |
|
---|
493 | @Override
|
---|
494 | public void lostOwnership(Clipboard clpbrd, Transferable t) {
|
---|
495 | }
|
---|
496 | });
|
---|
497 | return true;
|
---|
498 | } catch (IllegalStateException ex) {
|
---|
499 | Main.error(ex);
|
---|
500 | return false;
|
---|
501 | }
|
---|
502 | }
|
---|
503 |
|
---|
504 | /**
|
---|
505 | * Extracts clipboard content as string.
|
---|
506 | * @return string clipboard contents if available, {@code null} otherwise.
|
---|
507 | */
|
---|
508 | public static String getClipboardContent() {
|
---|
509 | Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
|
---|
510 | Transferable t = null;
|
---|
511 | for (int tries = 0; t == null && tries < 10; tries++) {
|
---|
512 | try {
|
---|
513 | t = clipboard.getContents(null);
|
---|
514 | } catch (IllegalStateException e) {
|
---|
515 | // Clipboard currently unavailable. On some platforms, the system clipboard is unavailable while it is accessed by another application.
|
---|
516 | try {
|
---|
517 | Thread.sleep(1);
|
---|
518 | } catch (InterruptedException ex) {
|
---|
519 | Main.warn("InterruptedException in "+Utils.class.getSimpleName()+" while getting clipboard content");
|
---|
520 | }
|
---|
521 | }
|
---|
522 | }
|
---|
523 | try {
|
---|
524 | if (t != null && t.isDataFlavorSupported(DataFlavor.stringFlavor)) {
|
---|
525 | return (String) t.getTransferData(DataFlavor.stringFlavor);
|
---|
526 | }
|
---|
527 | } catch (UnsupportedFlavorException | IOException ex) {
|
---|
528 | Main.error(ex);
|
---|
529 | return null;
|
---|
530 | }
|
---|
531 | return null;
|
---|
532 | }
|
---|
533 |
|
---|
534 | /**
|
---|
535 | * Calculate MD5 hash of a string and output in hexadecimal format.
|
---|
536 | * @param data arbitrary String
|
---|
537 | * @return MD5 hash of data, string of length 32 with characters in range [0-9a-f]
|
---|
538 | */
|
---|
539 | public static String md5Hex(String data) {
|
---|
540 | byte[] byteData = data.getBytes(StandardCharsets.UTF_8);
|
---|
541 | MessageDigest md = null;
|
---|
542 | try {
|
---|
543 | md = MessageDigest.getInstance("MD5");
|
---|
544 | } catch (NoSuchAlgorithmException e) {
|
---|
545 | throw new RuntimeException(e);
|
---|
546 | }
|
---|
547 | byte[] byteDigest = md.digest(byteData);
|
---|
548 | return toHexString(byteDigest);
|
---|
549 | }
|
---|
550 |
|
---|
551 | private static final char[] HEX_ARRAY = {'0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f'};
|
---|
552 |
|
---|
553 | /**
|
---|
554 | * Converts a byte array to a string of hexadecimal characters.
|
---|
555 | * Preserves leading zeros, so the size of the output string is always twice
|
---|
556 | * the number of input bytes.
|
---|
557 | * @param bytes the byte array
|
---|
558 | * @return hexadecimal representation
|
---|
559 | */
|
---|
560 | public static String toHexString(byte[] bytes) {
|
---|
561 |
|
---|
562 | if (bytes == null) {
|
---|
563 | return "";
|
---|
564 | }
|
---|
565 |
|
---|
566 | final int len = bytes.length;
|
---|
567 | if (len == 0) {
|
---|
568 | return "";
|
---|
569 | }
|
---|
570 |
|
---|
571 | char[] hexChars = new char[len * 2];
|
---|
572 | for (int i = 0, j = 0; i < len; i++) {
|
---|
573 | final int v = bytes[i];
|
---|
574 | hexChars[j++] = HEX_ARRAY[(v & 0xf0) >> 4];
|
---|
575 | hexChars[j++] = HEX_ARRAY[v & 0xf];
|
---|
576 | }
|
---|
577 | return new String(hexChars);
|
---|
578 | }
|
---|
579 |
|
---|
580 | /**
|
---|
581 | * Topological sort.
|
---|
582 | *
|
---|
583 | * @param dependencies contains mappings (key -> value). In the final list of sorted objects, the key will come
|
---|
584 | * after the value. (In other words, the key depends on the value(s).)
|
---|
585 | * There must not be cyclic dependencies.
|
---|
586 | * @return the list of sorted objects
|
---|
587 | */
|
---|
588 | public static <T> List<T> topologicalSort(final MultiMap<T,T> dependencies) {
|
---|
589 | MultiMap<T,T> deps = new MultiMap<>();
|
---|
590 | for (T key : dependencies.keySet()) {
|
---|
591 | deps.putVoid(key);
|
---|
592 | for (T val : dependencies.get(key)) {
|
---|
593 | deps.putVoid(val);
|
---|
594 | deps.put(key, val);
|
---|
595 | }
|
---|
596 | }
|
---|
597 |
|
---|
598 | int size = deps.size();
|
---|
599 | List<T> sorted = new ArrayList<>();
|
---|
600 | for (int i=0; i<size; ++i) {
|
---|
601 | T parentless = null;
|
---|
602 | for (T key : deps.keySet()) {
|
---|
603 | if (deps.get(key).isEmpty()) {
|
---|
604 | parentless = key;
|
---|
605 | break;
|
---|
606 | }
|
---|
607 | }
|
---|
608 | if (parentless == null) throw new RuntimeException();
|
---|
609 | sorted.add(parentless);
|
---|
610 | deps.remove(parentless);
|
---|
611 | for (T key : deps.keySet()) {
|
---|
612 | deps.remove(key, parentless);
|
---|
613 | }
|
---|
614 | }
|
---|
615 | if (sorted.size() != size) throw new RuntimeException();
|
---|
616 | return sorted;
|
---|
617 | }
|
---|
618 |
|
---|
619 | /**
|
---|
620 | * Represents a function that can be applied to objects of {@code A} and
|
---|
621 | * returns objects of {@code B}.
|
---|
622 | * @param <A> class of input objects
|
---|
623 | * @param <B> class of transformed objects
|
---|
624 | */
|
---|
625 | public static interface Function<A, B> {
|
---|
626 |
|
---|
627 | /**
|
---|
628 | * Applies the function on {@code x}.
|
---|
629 | * @param x an object of
|
---|
630 | * @return the transformed object
|
---|
631 | */
|
---|
632 | B apply(A x);
|
---|
633 | }
|
---|
634 |
|
---|
635 | /**
|
---|
636 | * Transforms the collection {@code c} into an unmodifiable collection and
|
---|
637 | * applies the {@link org.openstreetmap.josm.tools.Utils.Function} {@code f} on each element upon access.
|
---|
638 | * @param <A> class of input collection
|
---|
639 | * @param <B> class of transformed collection
|
---|
640 | * @param c a collection
|
---|
641 | * @param f a function that transforms objects of {@code A} to objects of {@code B}
|
---|
642 | * @return the transformed unmodifiable collection
|
---|
643 | */
|
---|
644 | public static <A, B> Collection<B> transform(final Collection<? extends A> c, final Function<A, B> f) {
|
---|
645 | return new AbstractCollection<B>() {
|
---|
646 |
|
---|
647 | @Override
|
---|
648 | public int size() {
|
---|
649 | return c.size();
|
---|
650 | }
|
---|
651 |
|
---|
652 | @Override
|
---|
653 | public Iterator<B> iterator() {
|
---|
654 | return new Iterator<B>() {
|
---|
655 |
|
---|
656 | private Iterator<? extends A> it = c.iterator();
|
---|
657 |
|
---|
658 | @Override
|
---|
659 | public boolean hasNext() {
|
---|
660 | return it.hasNext();
|
---|
661 | }
|
---|
662 |
|
---|
663 | @Override
|
---|
664 | public B next() {
|
---|
665 | return f.apply(it.next());
|
---|
666 | }
|
---|
667 |
|
---|
668 | @Override
|
---|
669 | public void remove() {
|
---|
670 | throw new UnsupportedOperationException();
|
---|
671 | }
|
---|
672 | };
|
---|
673 | }
|
---|
674 | };
|
---|
675 | }
|
---|
676 |
|
---|
677 | /**
|
---|
678 | * Transforms the list {@code l} into an unmodifiable list and
|
---|
679 | * applies the {@link org.openstreetmap.josm.tools.Utils.Function} {@code f} on each element upon access.
|
---|
680 | * @param <A> class of input collection
|
---|
681 | * @param <B> class of transformed collection
|
---|
682 | * @param l a collection
|
---|
683 | * @param f a function that transforms objects of {@code A} to objects of {@code B}
|
---|
684 | * @return the transformed unmodifiable list
|
---|
685 | */
|
---|
686 | public static <A, B> List<B> transform(final List<? extends A> l, final Function<A, B> f) {
|
---|
687 | return new AbstractList<B>() {
|
---|
688 |
|
---|
689 | @Override
|
---|
690 | public int size() {
|
---|
691 | return l.size();
|
---|
692 | }
|
---|
693 |
|
---|
694 | @Override
|
---|
695 | public B get(int index) {
|
---|
696 | return f.apply(l.get(index));
|
---|
697 | }
|
---|
698 | };
|
---|
699 | }
|
---|
700 |
|
---|
701 | private static final Pattern HTTP_PREFFIX_PATTERN = Pattern.compile("https?");
|
---|
702 |
|
---|
703 | /**
|
---|
704 | * Opens a HTTP connection to the given URL and sets the User-Agent property to JOSM's one.
|
---|
705 | * @param httpURL The HTTP url to open (must use http:// or https://)
|
---|
706 | * @return An open HTTP connection to the given URL
|
---|
707 | * @throws java.io.IOException if an I/O exception occurs.
|
---|
708 | * @since 5587
|
---|
709 | */
|
---|
710 | public static HttpURLConnection openHttpConnection(URL httpURL) throws IOException {
|
---|
711 | if (httpURL == null || !HTTP_PREFFIX_PATTERN.matcher(httpURL.getProtocol()).matches()) {
|
---|
712 | throw new IllegalArgumentException("Invalid HTTP url");
|
---|
713 | }
|
---|
714 | if (Main.isDebugEnabled()) {
|
---|
715 | Main.debug("Opening HTTP connection to "+httpURL.toExternalForm());
|
---|
716 | }
|
---|
717 | HttpURLConnection connection = (HttpURLConnection) httpURL.openConnection();
|
---|
718 | connection.setRequestProperty("User-Agent", Version.getInstance().getFullAgentString());
|
---|
719 | connection.setUseCaches(false);
|
---|
720 | return connection;
|
---|
721 | }
|
---|
722 |
|
---|
723 | /**
|
---|
724 | * Opens a connection to the given URL and sets the User-Agent property to JOSM's one.
|
---|
725 | * @param url The url to open
|
---|
726 | * @return An stream for the given URL
|
---|
727 | * @throws java.io.IOException if an I/O exception occurs.
|
---|
728 | * @since 5867
|
---|
729 | */
|
---|
730 | public static InputStream openURL(URL url) throws IOException {
|
---|
731 | return openURLAndDecompress(url, false);
|
---|
732 | }
|
---|
733 |
|
---|
734 | /**
|
---|
735 | * Opens a connection to the given URL, sets the User-Agent property to JOSM's one, and decompresses stream if necessary.
|
---|
736 | * @param url The url to open
|
---|
737 | * @param decompress whether to wrap steam in a {@link GZIPInputStream} or {@link BZip2CompressorInputStream}
|
---|
738 | * if the {@code Content-Type} header is set accordingly.
|
---|
739 | * @return An stream for the given URL
|
---|
740 | * @throws IOException if an I/O exception occurs.
|
---|
741 | * @since 6421
|
---|
742 | */
|
---|
743 | public static InputStream openURLAndDecompress(final URL url, final boolean decompress) throws IOException {
|
---|
744 | final URLConnection connection = setupURLConnection(url.openConnection());
|
---|
745 | final InputStream in = connection.getInputStream();
|
---|
746 | if (decompress) {
|
---|
747 | switch (connection.getHeaderField("Content-Type")) {
|
---|
748 | case "application/zip":
|
---|
749 | return getZipInputStream(in);
|
---|
750 | case "application/x-gzip":
|
---|
751 | return getGZipInputStream(in);
|
---|
752 | case "application/x-bzip2":
|
---|
753 | return getBZip2InputStream(in);
|
---|
754 | }
|
---|
755 | }
|
---|
756 | return in;
|
---|
757 | }
|
---|
758 |
|
---|
759 | /**
|
---|
760 | * Returns a Bzip2 input stream wrapping given input stream.
|
---|
761 | * @param in The raw input stream
|
---|
762 | * @return a Bzip2 input stream wrapping given input stream, or {@code null} if {@code in} is {@code null}
|
---|
763 | * @throws IOException if the given input stream does not contain valid BZ2 header
|
---|
764 | * @since 7867
|
---|
765 | */
|
---|
766 | public static BZip2CompressorInputStream getBZip2InputStream(InputStream in) throws IOException {
|
---|
767 | if (in == null) {
|
---|
768 | return null;
|
---|
769 | }
|
---|
770 | return new BZip2CompressorInputStream(in, /* see #9537 */ true);
|
---|
771 | }
|
---|
772 |
|
---|
773 | /**
|
---|
774 | * Returns a Gzip input stream wrapping given input stream.
|
---|
775 | * @param in The raw input stream
|
---|
776 | * @return a Gzip input stream wrapping given input stream, or {@code null} if {@code in} is {@code null}
|
---|
777 | * @throws IOException if an I/O error has occurred
|
---|
778 | * @since 7119
|
---|
779 | */
|
---|
780 | public static GZIPInputStream getGZipInputStream(InputStream in) throws IOException {
|
---|
781 | if (in == null) {
|
---|
782 | return null;
|
---|
783 | }
|
---|
784 | return new GZIPInputStream(in);
|
---|
785 | }
|
---|
786 |
|
---|
787 | /**
|
---|
788 | * Returns a Zip input stream wrapping given input stream.
|
---|
789 | * @param in The raw input stream
|
---|
790 | * @return a Zip input stream wrapping given input stream, or {@code null} if {@code in} is {@code null}
|
---|
791 | * @throws IOException if an I/O error has occurred
|
---|
792 | * @since 7119
|
---|
793 | */
|
---|
794 | public static ZipInputStream getZipInputStream(InputStream in) throws IOException {
|
---|
795 | if (in == null) {
|
---|
796 | return null;
|
---|
797 | }
|
---|
798 | ZipInputStream zis = new ZipInputStream(in, StandardCharsets.UTF_8);
|
---|
799 | // Positions the stream at the beginning of first entry
|
---|
800 | ZipEntry ze = zis.getNextEntry();
|
---|
801 | if (ze != null && Main.isDebugEnabled()) {
|
---|
802 | Main.debug("Zip entry: "+ze.getName());
|
---|
803 | }
|
---|
804 | return zis;
|
---|
805 | }
|
---|
806 |
|
---|
807 | /***
|
---|
808 | * Setups the given URL connection to match JOSM needs by setting its User-Agent and timeout properties.
|
---|
809 | * @param connection The connection to setup
|
---|
810 | * @return {@code connection}, with updated properties
|
---|
811 | * @since 5887
|
---|
812 | */
|
---|
813 | public static URLConnection setupURLConnection(URLConnection connection) {
|
---|
814 | if (connection != null) {
|
---|
815 | connection.setRequestProperty("User-Agent", Version.getInstance().getFullAgentString());
|
---|
816 | connection.setConnectTimeout(Main.pref.getInteger("socket.timeout.connect",15)*1000);
|
---|
817 | connection.setReadTimeout(Main.pref.getInteger("socket.timeout.read",30)*1000);
|
---|
818 | }
|
---|
819 | return connection;
|
---|
820 | }
|
---|
821 |
|
---|
822 | /**
|
---|
823 | * Opens a connection to the given URL and sets the User-Agent property to JOSM's one.
|
---|
824 | * @param url The url to open
|
---|
825 | * @return An buffered stream reader for the given URL (using UTF-8)
|
---|
826 | * @throws java.io.IOException if an I/O exception occurs.
|
---|
827 | * @since 5868
|
---|
828 | */
|
---|
829 | public static BufferedReader openURLReader(URL url) throws IOException {
|
---|
830 | return openURLReaderAndDecompress(url, false);
|
---|
831 | }
|
---|
832 |
|
---|
833 | /**
|
---|
834 | * Opens a connection to the given URL and sets the User-Agent property to JOSM's one.
|
---|
835 | * @param url The url to open
|
---|
836 | * @param decompress whether to wrap steam in a {@link GZIPInputStream} or {@link BZip2CompressorInputStream}
|
---|
837 | * if the {@code Content-Type} header is set accordingly.
|
---|
838 | * @return An buffered stream reader for the given URL (using UTF-8)
|
---|
839 | * @throws IOException if an I/O exception occurs.
|
---|
840 | * @since 6421
|
---|
841 | */
|
---|
842 | public static BufferedReader openURLReaderAndDecompress(final URL url, final boolean decompress) throws IOException {
|
---|
843 | return new BufferedReader(new InputStreamReader(openURLAndDecompress(url, decompress), StandardCharsets.UTF_8));
|
---|
844 | }
|
---|
845 |
|
---|
846 | /**
|
---|
847 | * Opens a HTTP connection to the given URL, sets the User-Agent property to JOSM's one and optionnaly disables Keep-Alive.
|
---|
848 | * @param httpURL The HTTP url to open (must use http:// or https://)
|
---|
849 | * @param keepAlive whether not to set header {@code Connection=close}
|
---|
850 | * @return An open HTTP connection to the given URL
|
---|
851 | * @throws java.io.IOException if an I/O exception occurs.
|
---|
852 | * @since 5587
|
---|
853 | */
|
---|
854 | public static HttpURLConnection openHttpConnection(URL httpURL, boolean keepAlive) throws IOException {
|
---|
855 | HttpURLConnection connection = openHttpConnection(httpURL);
|
---|
856 | if (!keepAlive) {
|
---|
857 | connection.setRequestProperty("Connection", "close");
|
---|
858 | }
|
---|
859 | if (Main.isDebugEnabled()) {
|
---|
860 | try {
|
---|
861 | Main.debug("REQUEST: "+ connection.getRequestProperties());
|
---|
862 | } catch (IllegalStateException e) {
|
---|
863 | Main.warn(e);
|
---|
864 | }
|
---|
865 | }
|
---|
866 | return connection;
|
---|
867 | }
|
---|
868 |
|
---|
869 | /**
|
---|
870 | * An alternative to {@link String#trim()} to effectively remove all leading and trailing white characters, including Unicode ones.
|
---|
871 | * @see <a href="http://closingbraces.net/2008/11/11/javastringtrim/">Java’s String.trim has a strange idea of whitespace</a>
|
---|
872 | * @see <a href="https://bugs.openjdk.java.net/browse/JDK-4080617">JDK bug 4080617</a>
|
---|
873 | * @param str The string to strip
|
---|
874 | * @return <code>str</code>, without leading and trailing characters, according to
|
---|
875 | * {@link Character#isWhitespace(char)} and {@link Character#isSpaceChar(char)}.
|
---|
876 | * @since 5772
|
---|
877 | */
|
---|
878 | public static String strip(String str) {
|
---|
879 | if (str == null || str.isEmpty()) {
|
---|
880 | return str;
|
---|
881 | }
|
---|
882 | int start = 0, end = str.length();
|
---|
883 | boolean leadingWhite = true;
|
---|
884 | while (leadingWhite && start < end) {
|
---|
885 | char c = str.charAt(start);
|
---|
886 | // '\u200B' (ZERO WIDTH SPACE character) needs to be handled manually because of change in Unicode 6.0 (Java 7, see #8918)
|
---|
887 | // same for '\uFEFF' (ZERO WIDTH NO-BREAK SPACE)
|
---|
888 | leadingWhite = (Character.isWhitespace(c) || Character.isSpaceChar(c) || c == '\u200B' || c == '\uFEFF');
|
---|
889 | if (leadingWhite) {
|
---|
890 | start++;
|
---|
891 | }
|
---|
892 | }
|
---|
893 | boolean trailingWhite = true;
|
---|
894 | while (trailingWhite && end > start+1) {
|
---|
895 | char c = str.charAt(end-1);
|
---|
896 | trailingWhite = (Character.isWhitespace(c) || Character.isSpaceChar(c) || c == '\u200B' || c == '\uFEFF');
|
---|
897 | if (trailingWhite) {
|
---|
898 | end--;
|
---|
899 | }
|
---|
900 | }
|
---|
901 | return str.substring(start, end);
|
---|
902 | }
|
---|
903 |
|
---|
904 | /**
|
---|
905 | * Runs an external command and returns the standard output.
|
---|
906 | *
|
---|
907 | * The program is expected to execute fast.
|
---|
908 | *
|
---|
909 | * @param command the command with arguments
|
---|
910 | * @return the output
|
---|
911 | * @throws IOException when there was an error, e.g. command does not exist
|
---|
912 | */
|
---|
913 | public static String execOutput(List<String> command) throws IOException {
|
---|
914 | if (Main.isDebugEnabled()) {
|
---|
915 | Main.debug(join(" ", command));
|
---|
916 | }
|
---|
917 | Process p = new ProcessBuilder(command).start();
|
---|
918 | try (BufferedReader input = new BufferedReader(new InputStreamReader(p.getInputStream(), StandardCharsets.UTF_8))) {
|
---|
919 | StringBuilder all = null;
|
---|
920 | String line;
|
---|
921 | while ((line = input.readLine()) != null) {
|
---|
922 | if (all == null) {
|
---|
923 | all = new StringBuilder(line);
|
---|
924 | } else {
|
---|
925 | all.append("\n");
|
---|
926 | all.append(line);
|
---|
927 | }
|
---|
928 | }
|
---|
929 | return all != null ? all.toString() : null;
|
---|
930 | }
|
---|
931 | }
|
---|
932 |
|
---|
933 | /**
|
---|
934 | * Returns the JOSM temp directory.
|
---|
935 | * @return The JOSM temp directory ({@code <java.io.tmpdir>/JOSM}), or {@code null} if {@code java.io.tmpdir} is not defined
|
---|
936 | * @since 6245
|
---|
937 | */
|
---|
938 | public static File getJosmTempDir() {
|
---|
939 | String tmpDir = System.getProperty("java.io.tmpdir");
|
---|
940 | if (tmpDir == null) {
|
---|
941 | return null;
|
---|
942 | }
|
---|
943 | File josmTmpDir = new File(tmpDir, "JOSM");
|
---|
944 | if (!josmTmpDir.exists() && !josmTmpDir.mkdirs()) {
|
---|
945 | Main.warn("Unable to create temp directory "+josmTmpDir);
|
---|
946 | }
|
---|
947 | return josmTmpDir;
|
---|
948 | }
|
---|
949 |
|
---|
950 | /**
|
---|
951 | * Returns a simple human readable (hours, minutes, seconds) string for a given duration in milliseconds.
|
---|
952 | * @param elapsedTime The duration in milliseconds
|
---|
953 | * @return A human readable string for the given duration
|
---|
954 | * @throws IllegalArgumentException if elapsedTime is < 0
|
---|
955 | * @since 6354
|
---|
956 | */
|
---|
957 | public static String getDurationString(long elapsedTime) {
|
---|
958 | if (elapsedTime < 0) {
|
---|
959 | throw new IllegalArgumentException("elapsedTime must be >= 0");
|
---|
960 | }
|
---|
961 | // Is it less than 1 second ?
|
---|
962 | if (elapsedTime < MILLIS_OF_SECOND) {
|
---|
963 | return String.format("%d %s", elapsedTime, tr("ms"));
|
---|
964 | }
|
---|
965 | // Is it less than 1 minute ?
|
---|
966 | if (elapsedTime < MILLIS_OF_MINUTE) {
|
---|
967 | return String.format("%.1f %s", elapsedTime / (float) MILLIS_OF_SECOND, tr("s"));
|
---|
968 | }
|
---|
969 | // Is it less than 1 hour ?
|
---|
970 | if (elapsedTime < MILLIS_OF_HOUR) {
|
---|
971 | final long min = elapsedTime / MILLIS_OF_MINUTE;
|
---|
972 | return String.format("%d %s %d %s", min, tr("min"), (elapsedTime - min * MILLIS_OF_MINUTE) / MILLIS_OF_SECOND, tr("s"));
|
---|
973 | }
|
---|
974 | // Is it less than 1 day ?
|
---|
975 | if (elapsedTime < MILLIS_OF_DAY) {
|
---|
976 | final long hour = elapsedTime / MILLIS_OF_HOUR;
|
---|
977 | return String.format("%d %s %d %s", hour, tr("h"), (elapsedTime - hour * MILLIS_OF_HOUR) / MILLIS_OF_MINUTE, tr("min"));
|
---|
978 | }
|
---|
979 | long days = elapsedTime / MILLIS_OF_DAY;
|
---|
980 | return String.format("%d %s %d %s", days, trn("day", "days", days), (elapsedTime - days * MILLIS_OF_DAY) / MILLIS_OF_HOUR, tr("h"));
|
---|
981 | }
|
---|
982 |
|
---|
983 | /**
|
---|
984 | * Returns a human readable representation of a list of positions.
|
---|
985 | * <p>
|
---|
986 | * For instance, {@code [1,5,2,6,7} yields "1-2,5-7
|
---|
987 | * @param positionList a list of positions
|
---|
988 | * @return a human readable representation
|
---|
989 | */
|
---|
990 | public static String getPositionListString(List<Integer> positionList) {
|
---|
991 | Collections.sort(positionList);
|
---|
992 | final StringBuilder sb = new StringBuilder(32);
|
---|
993 | sb.append(positionList.get(0));
|
---|
994 | int cnt = 0;
|
---|
995 | int last = positionList.get(0);
|
---|
996 | for (int i = 1; i < positionList.size(); ++i) {
|
---|
997 | int cur = positionList.get(i);
|
---|
998 | if (cur == last + 1) {
|
---|
999 | ++cnt;
|
---|
1000 | } else if (cnt == 0) {
|
---|
1001 | sb.append(",").append(cur);
|
---|
1002 | } else {
|
---|
1003 | sb.append("-").append(last);
|
---|
1004 | sb.append(",").append(cur);
|
---|
1005 | cnt = 0;
|
---|
1006 | }
|
---|
1007 | last = cur;
|
---|
1008 | }
|
---|
1009 | if (cnt >= 1) {
|
---|
1010 | sb.append("-").append(last);
|
---|
1011 | }
|
---|
1012 | return sb.toString();
|
---|
1013 | }
|
---|
1014 |
|
---|
1015 |
|
---|
1016 | /**
|
---|
1017 | * Returns a list of capture groups if {@link Matcher#matches()}, or {@code null}.
|
---|
1018 | * The first element (index 0) is the complete match.
|
---|
1019 | * Further elements correspond to the parts in parentheses of the regular expression.
|
---|
1020 | * @param m the matcher
|
---|
1021 | * @return a list of capture groups if {@link Matcher#matches()}, or {@code null}.
|
---|
1022 | */
|
---|
1023 | public static List<String> getMatches(final Matcher m) {
|
---|
1024 | if (m.matches()) {
|
---|
1025 | List<String> result = new ArrayList<>(m.groupCount() + 1);
|
---|
1026 | for (int i = 0; i <= m.groupCount(); i++) {
|
---|
1027 | result.add(m.group(i));
|
---|
1028 | }
|
---|
1029 | return result;
|
---|
1030 | } else {
|
---|
1031 | return null;
|
---|
1032 | }
|
---|
1033 | }
|
---|
1034 |
|
---|
1035 | /**
|
---|
1036 | * Cast an object savely.
|
---|
1037 | * @param <T> the target type
|
---|
1038 | * @param o the object to cast
|
---|
1039 | * @param klass the target class (same as T)
|
---|
1040 | * @return null if <code>o</code> is null or the type <code>o</code> is not
|
---|
1041 | * a subclass of <code>klass</code>. The casted value otherwise.
|
---|
1042 | */
|
---|
1043 | @SuppressWarnings("unchecked")
|
---|
1044 | public static <T> T cast(Object o, Class<T> klass) {
|
---|
1045 | if (klass.isInstance(o)) {
|
---|
1046 | return (T) o;
|
---|
1047 | }
|
---|
1048 | return null;
|
---|
1049 | }
|
---|
1050 |
|
---|
1051 | /**
|
---|
1052 | * Returns the root cause of a throwable object.
|
---|
1053 | * @param t The object to get root cause for
|
---|
1054 | * @return the root cause of {@code t}
|
---|
1055 | * @since 6639
|
---|
1056 | */
|
---|
1057 | public static Throwable getRootCause(Throwable t) {
|
---|
1058 | Throwable result = t;
|
---|
1059 | if (result != null) {
|
---|
1060 | Throwable cause = result.getCause();
|
---|
1061 | while (cause != null && !cause.equals(result)) {
|
---|
1062 | result = cause;
|
---|
1063 | cause = result.getCause();
|
---|
1064 | }
|
---|
1065 | }
|
---|
1066 | return result;
|
---|
1067 | }
|
---|
1068 |
|
---|
1069 | /**
|
---|
1070 | * Adds the given item at the end of a new copy of given array.
|
---|
1071 | * @param array The source array
|
---|
1072 | * @param item The item to add
|
---|
1073 | * @return An extended copy of {@code array} containing {@code item} as additional last element
|
---|
1074 | * @since 6717
|
---|
1075 | */
|
---|
1076 | public static <T> T[] addInArrayCopy(T[] array, T item) {
|
---|
1077 | T[] biggerCopy = Arrays.copyOf(array, array.length + 1);
|
---|
1078 | biggerCopy[array.length] = item;
|
---|
1079 | return biggerCopy;
|
---|
1080 | }
|
---|
1081 |
|
---|
1082 | /**
|
---|
1083 | * If the string {@code s} is longer than {@code maxLength}, the string is cut and "..." is appended.
|
---|
1084 | * @param s String to shorten
|
---|
1085 | * @param maxLength maximum number of characters to keep (not including the "...")
|
---|
1086 | * @return the shortened string
|
---|
1087 | */
|
---|
1088 | public static String shortenString(String s, int maxLength) {
|
---|
1089 | if (s != null && s.length() > maxLength) {
|
---|
1090 | return s.substring(0, maxLength - 3) + "...";
|
---|
1091 | } else {
|
---|
1092 | return s;
|
---|
1093 | }
|
---|
1094 | }
|
---|
1095 |
|
---|
1096 | /**
|
---|
1097 | * Fixes URL with illegal characters in the query (and fragment) part by
|
---|
1098 | * percent encoding those characters.
|
---|
1099 | *
|
---|
1100 | * special characters like & and # are not encoded
|
---|
1101 | *
|
---|
1102 | * @param url the URL that should be fixed
|
---|
1103 | * @return the repaired URL
|
---|
1104 | */
|
---|
1105 | public static String fixURLQuery(String url) {
|
---|
1106 | if (url.indexOf('?') == -1)
|
---|
1107 | return url;
|
---|
1108 |
|
---|
1109 | String query = url.substring(url.indexOf('?') + 1);
|
---|
1110 |
|
---|
1111 | StringBuilder sb = new StringBuilder(url.substring(0, url.indexOf('?') + 1));
|
---|
1112 |
|
---|
1113 | for (int i=0; i<query.length(); i++) {
|
---|
1114 | String c = query.substring(i, i+1);
|
---|
1115 | if (URL_CHARS.contains(c)) {
|
---|
1116 | sb.append(c);
|
---|
1117 | } else {
|
---|
1118 | try {
|
---|
1119 | sb.append(URLEncoder.encode(c, "UTF-8"));
|
---|
1120 | } catch (UnsupportedEncodingException ex) {
|
---|
1121 | throw new RuntimeException(ex);
|
---|
1122 | }
|
---|
1123 | }
|
---|
1124 | }
|
---|
1125 | return sb.toString();
|
---|
1126 | }
|
---|
1127 |
|
---|
1128 | /**
|
---|
1129 | * Determines if the given URL denotes a file on a local filesystem.
|
---|
1130 | * @param url The URL to test
|
---|
1131 | * @return {@code true} if the url points to a local file
|
---|
1132 | * @since 7356
|
---|
1133 | */
|
---|
1134 | public static boolean isLocalUrl(String url) {
|
---|
1135 | if (url.startsWith("http://") || url.startsWith("https://") || url.startsWith("resource://"))
|
---|
1136 | return false;
|
---|
1137 | return true;
|
---|
1138 | }
|
---|
1139 |
|
---|
1140 | /**
|
---|
1141 | * Returns a pair containing the number of threads (n), and a thread pool (if n > 1) to perform
|
---|
1142 | * multi-thread computation in the context of the given preference key.
|
---|
1143 | * @param pref The preference key
|
---|
1144 | * @return a pair containing the number of threads (n), and a thread pool (if n > 1, null otherwise)
|
---|
1145 | * @since 7423
|
---|
1146 | */
|
---|
1147 | public static Pair<Integer, ExecutorService> newThreadPool(String pref) {
|
---|
1148 | int noThreads = Main.pref.getInteger(pref, Runtime.getRuntime().availableProcessors());
|
---|
1149 | ExecutorService pool = noThreads <= 1 ? null : Executors.newFixedThreadPool(noThreads);
|
---|
1150 | return new Pair<>(noThreads, pool);
|
---|
1151 | }
|
---|
1152 |
|
---|
1153 | /**
|
---|
1154 | * Updates a given system property.
|
---|
1155 | * @param key The property key
|
---|
1156 | * @param value The property value
|
---|
1157 | * @return the previous value of the system property, or {@code null} if it did not have one.
|
---|
1158 | * @since 7894
|
---|
1159 | */
|
---|
1160 | public static String updateSystemProperty(String key, String value) {
|
---|
1161 | if (value != null) {
|
---|
1162 | String old = System.setProperty(key, value);
|
---|
1163 | if (!key.toLowerCase().contains("password")) {
|
---|
1164 | Main.debug("System property '"+key+"' set to '"+value+"'. Old value was '"+old+"'");
|
---|
1165 | } else {
|
---|
1166 | Main.debug("System property '"+key+"' changed.");
|
---|
1167 | }
|
---|
1168 | return old;
|
---|
1169 | }
|
---|
1170 | return null;
|
---|
1171 | }
|
---|
1172 |
|
---|
1173 | /**
|
---|
1174 | * Returns a new secure SAX parser, supporting XML namespaces.
|
---|
1175 | * @return a new secure SAX parser, supporting XML namespaces
|
---|
1176 | * @throws ParserConfigurationException if a parser cannot be created which satisfies the requested configuration.
|
---|
1177 | * @throws SAXException for SAX errors.
|
---|
1178 | * @since 8287
|
---|
1179 | */
|
---|
1180 | public static SAXParser newSafeSAXParser() throws ParserConfigurationException, SAXException {
|
---|
1181 | SAXParserFactory parserFactory = SAXParserFactory.newInstance();
|
---|
1182 | parserFactory.setFeature(XMLConstants.FEATURE_SECURE_PROCESSING, true);
|
---|
1183 | parserFactory.setNamespaceAware(true);
|
---|
1184 | return parserFactory.newSAXParser();
|
---|
1185 | }
|
---|
1186 | }
|
---|