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