1 | // License: GPL. Copyright 2007 by Immanuel Scholz and others
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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 |
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6 | import java.io.IOException;
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7 | import java.io.Reader;
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8 | import java.lang.reflect.Field;
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9 | import java.lang.reflect.Method;
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10 | import java.lang.reflect.Modifier;
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11 | import java.util.HashMap;
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12 | import java.util.Iterator;
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13 | import java.util.LinkedList;
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14 | import java.util.Map;
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15 | import java.util.Stack;
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16 |
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17 | import javax.xml.parsers.ParserConfigurationException;
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18 | import javax.xml.parsers.SAXParser;
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19 | import javax.xml.parsers.SAXParserFactory;
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20 | import javax.xml.transform.stream.StreamSource;
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21 | import javax.xml.validation.Schema;
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22 | import javax.xml.validation.SchemaFactory;
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23 | import javax.xml.validation.ValidatorHandler;
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24 |
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25 | import org.openstreetmap.josm.io.MirroredInputStream;
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26 | import org.xml.sax.Attributes;
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27 | import org.xml.sax.ContentHandler;
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28 | import org.xml.sax.InputSource;
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29 | import org.xml.sax.Locator;
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30 | import org.xml.sax.SAXException;
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31 | import org.xml.sax.SAXParseException;
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32 | import org.xml.sax.XMLReader;
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33 | import org.xml.sax.helpers.DefaultHandler;
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34 | import org.xml.sax.helpers.XMLFilterImpl;
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35 |
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36 | /**
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37 | * An helper class that reads from a XML stream into specific objects.
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38 | *
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39 | * @author Imi
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40 | */
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41 | public class XmlObjectParser implements Iterable<Object> {
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42 | public static class PresetParsingException extends SAXException {
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43 | private int columnNumber;
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44 | private int lineNumber;
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45 |
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46 | public PresetParsingException() {
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47 | super();
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48 | }
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49 |
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50 | public PresetParsingException(Exception e) {
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51 | super(e);
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52 | }
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53 |
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54 | public PresetParsingException(String message, Exception e) {
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55 | super(message, e);
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56 | }
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57 |
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58 | public PresetParsingException(String message) {
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59 | super(message);
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60 | }
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61 |
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62 | public PresetParsingException rememberLocation(Locator locator) {
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63 | if (locator == null) return this;
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64 | this.columnNumber = locator.getColumnNumber();
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65 | this.lineNumber = locator.getLineNumber();
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66 | return this;
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67 | }
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68 |
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69 | @Override
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70 | public String getMessage() {
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71 | String msg = super.getMessage();
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72 | if (lineNumber == 0 && columnNumber == 0)
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73 | return msg;
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74 | if (msg == null) {
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75 | msg = getClass().getName();
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76 | }
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77 | msg = msg + " " + tr("(at line {0}, column {1})", lineNumber, columnNumber);
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78 | return msg;
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79 | }
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80 |
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81 | public int getColumnNumber() {
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82 | return columnNumber;
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83 | }
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84 |
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85 | public int getLineNumber() {
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86 | return lineNumber;
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87 | }
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88 | }
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89 |
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90 | public static final String lang = LanguageInfo.getLanguageCodeXML();
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91 |
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92 | private static class AddNamespaceFilter extends XMLFilterImpl {
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93 |
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94 | private final String namespace;
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95 |
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96 | public AddNamespaceFilter(String namespace) {
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97 | this.namespace = namespace;
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98 | }
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99 |
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100 | @Override
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101 | public void startElement (String uri, String localName, String qName, Attributes atts) throws SAXException {
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102 | if ("".equals(uri)) {
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103 | super.startElement(namespace, localName, qName, atts);
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104 | } else {
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105 | super.startElement(uri, localName, qName, atts);
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106 | }
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107 |
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108 | }
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109 |
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110 | }
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111 |
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112 | private class Parser extends DefaultHandler {
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113 | Stack<Object> current = new Stack<Object>();
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114 | StringBuilder characters = new StringBuilder(64);
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115 |
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116 | private Locator locator;
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117 |
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118 | @Override
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119 | public void setDocumentLocator(Locator locator) {
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120 | this.locator = locator;
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121 | }
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122 |
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123 | protected void throwException(Exception e) throws PresetParsingException{
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124 | throw new PresetParsingException(e).rememberLocation(locator);
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125 | }
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126 |
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127 | @Override public void startElement(String ns, String lname, String qname, Attributes a) throws SAXException {
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128 | if (mapping.containsKey(qname)) {
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129 | Class<?> klass = mapping.get(qname).klass;
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130 | try {
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131 | current.push(klass.newInstance());
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132 | } catch (Exception e) {
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133 | throwException(e);
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134 | }
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135 | for (int i = 0; i < a.getLength(); ++i) {
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136 | setValue(mapping.get(qname), a.getQName(i), a.getValue(i));
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137 | }
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138 | if (mapping.get(qname).onStart) {
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139 | report();
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140 | }
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141 | if (mapping.get(qname).both) {
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142 | queue.add(current.peek());
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143 | }
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144 | }
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145 | }
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146 | @Override public void endElement(String ns, String lname, String qname) throws SAXException {
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147 | if (mapping.containsKey(qname) && !mapping.get(qname).onStart) {
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148 | report();
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149 | } else if (mapping.containsKey(qname) && characters != null && !current.isEmpty()) {
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150 | setValue(mapping.get(qname), qname, characters.toString().trim());
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151 | characters = new StringBuilder(64);
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152 | }
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153 | }
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154 | @Override public void characters(char[] ch, int start, int length) {
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155 | characters.append(ch, start, length);
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156 | }
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157 |
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158 | private void report() {
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159 | queue.add(current.pop());
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160 | characters = new StringBuilder(64);
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161 | }
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162 |
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163 | private Object getValueForClass(Class<?> klass, String value) {
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164 | if (klass == Boolean.TYPE)
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165 | return parseBoolean(value);
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166 | else if (klass == Integer.TYPE || klass == Long.TYPE)
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167 | return Long.parseLong(value);
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168 | else if (klass == Float.TYPE || klass == Double.TYPE)
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169 | return Double.parseDouble(value);
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170 | return value;
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171 | }
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172 |
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173 | private void setValue(Entry entry, String fieldName, String value) throws SAXException {
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174 | if (entry == null) {
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175 | throw new NullPointerException("entry cannot be null");
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176 | }
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177 | if (fieldName.equals("class") || fieldName.equals("default") || fieldName.equals("throw") || fieldName.equals("new") || fieldName.equals("null")) {
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178 | fieldName += "_";
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179 | }
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180 | try {
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181 | Object c = current.peek();
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182 | Field f = entry.getField(fieldName);
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183 | if (f == null && fieldName.startsWith(lang)) {
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184 | f = entry.getField("locale_" + fieldName.substring(lang.length()));
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185 | }
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186 | if (f != null && Modifier.isPublic(f.getModifiers()) && String.class.equals(f.getType())) {
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187 | f.set(c, getValueForClass(f.getType(), value));
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188 | } else {
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189 | if (fieldName.startsWith(lang)) {
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190 | int l = lang.length();
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191 | fieldName = "set" + fieldName.substring(l, l + 1).toUpperCase() + fieldName.substring(l + 1);
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192 | } else {
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193 | fieldName = "set" + fieldName.substring(0, 1).toUpperCase() + fieldName.substring(1);
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194 | }
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195 | Method m = entry.getMethod(fieldName);
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196 | if (m != null) {
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197 | m.invoke(c, new Object[]{getValueForClass(m.getParameterTypes()[0], value)});
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198 | }
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199 | }
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200 | } catch (Exception e) {
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201 | e.printStackTrace(); // SAXException does not dump inner exceptions.
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202 | throwException(e);
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203 | }
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204 | }
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205 |
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206 | private boolean parseBoolean(String s) {
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207 | return s != null
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208 | && !s.equals("0")
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209 | && !s.startsWith("off")
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210 | && !s.startsWith("false")
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211 | && !s.startsWith("no");
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212 | }
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213 |
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214 | @Override
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215 | public void error(SAXParseException e) throws SAXException {
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216 | throwException(e);
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217 | }
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218 |
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219 | @Override
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220 | public void fatalError(SAXParseException e) throws SAXException {
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221 | throwException(e);
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222 | }
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223 | }
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224 |
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225 | private static class Entry {
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226 | Class<?> klass;
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227 | boolean onStart;
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228 | boolean both;
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229 | private final Map<String, Field> fields = new HashMap<String, Field>();
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230 | private final Map<String, Method> methods = new HashMap<String, Method>();
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231 |
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232 | public Entry(Class<?> klass, boolean onStart, boolean both) {
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233 | this.klass = klass;
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234 | this.onStart = onStart;
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235 | this.both = both;
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236 | }
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237 |
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238 | Field getField(String s) {
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239 | if (fields.containsKey(s)) {
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240 | return fields.get(s);
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241 | } else {
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242 | try {
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243 | Field f = klass.getField(s);
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244 | fields.put(s, f);
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245 | return f;
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246 | } catch (NoSuchFieldException ex) {
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247 | fields.put(s, null);
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248 | return null;
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249 | }
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250 | }
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251 | }
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252 |
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253 | Method getMethod(String s) {
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254 | if (methods.containsKey(s)) {
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255 | return methods.get(s);
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256 | } else {
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257 | for (Method m : klass.getMethods()) {
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258 | if (m.getName().equals(s) && m.getParameterTypes().length == 1) {
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259 | methods.put(s, m);
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260 | return m;
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261 | }
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262 | }
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263 | methods.put(s, null);
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264 | return null;
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265 | }
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266 | }
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267 | }
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268 |
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269 | private Map<String, Entry> mapping = new HashMap<String, Entry>();
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270 | private DefaultHandler parser;
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271 |
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272 | /**
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273 | * The queue of already parsed items from the parsing thread.
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274 | */
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275 | private LinkedList<Object> queue = new LinkedList<Object>();
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276 | private Iterator<Object> queueIterator = null;
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277 |
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278 | public XmlObjectParser() {
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279 | parser = new Parser();
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280 | }
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281 |
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282 | public XmlObjectParser(DefaultHandler handler) {
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283 | parser = handler;
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284 | }
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285 |
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286 | private Iterable<Object> start(final Reader in, final ContentHandler contentHandler) throws SAXException, IOException {
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287 | try {
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288 | SAXParserFactory parserFactory = SAXParserFactory.newInstance();
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289 | parserFactory.setNamespaceAware(true);
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290 | SAXParser saxParser = parserFactory.newSAXParser();
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291 | XMLReader reader = saxParser.getXMLReader();
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292 | reader.setContentHandler(contentHandler);
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293 | reader.parse(new InputSource(in));
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294 | queueIterator = queue.iterator();
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295 | return this;
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296 | } catch (ParserConfigurationException e) {
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297 | // This should never happen ;-)
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298 | throw new RuntimeException(e);
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299 | }
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300 | }
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301 |
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302 | public Iterable<Object> start(final Reader in) throws SAXException {
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303 | try {
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304 | return start(in, parser);
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305 | } catch (IOException e) {
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306 | throw new SAXException(e);
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307 | }
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308 | }
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309 |
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310 | public Iterable<Object> startWithValidation(final Reader in, String namespace, String schemaSource) throws SAXException {
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311 | try {
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312 | SchemaFactory factory = SchemaFactory.newInstance("http://www.w3.org/2001/XMLSchema");
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313 | Schema schema = factory.newSchema(new StreamSource(new MirroredInputStream(schemaSource)));
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314 | ValidatorHandler validator = schema.newValidatorHandler();
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315 | validator.setContentHandler(parser);
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316 | validator.setErrorHandler(parser);
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317 |
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318 | AddNamespaceFilter filter = new AddNamespaceFilter(namespace);
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319 | filter.setContentHandler(validator);
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320 | return start(in, filter);
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321 | } catch(IOException e) {
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322 | throw new SAXException(tr("Failed to load XML schema."), e);
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323 | }
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324 | }
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325 |
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326 | public void map(String tagName, Class<?> klass) {
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327 | mapping.put(tagName, new Entry(klass,false,false));
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328 | }
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329 |
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330 | public void mapOnStart(String tagName, Class<?> klass) {
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331 | mapping.put(tagName, new Entry(klass,true,false));
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332 | }
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333 |
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334 | public void mapBoth(String tagName, Class<?> klass) {
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335 | mapping.put(tagName, new Entry(klass,false,true));
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336 | }
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337 |
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338 | public Object next() {
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339 | return queueIterator.next();
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340 | }
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341 |
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342 | public boolean hasNext() {
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343 | return queueIterator.hasNext();
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344 | }
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345 |
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346 | @Override
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347 | public Iterator<Object> iterator() {
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348 | return queue.iterator();
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349 | }
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350 | }
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