Mercurial > dive4elements > river

annotate flys-aft/src/main/java/de/intevation/utils/XML.java @ 4077:97de7a552b79

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Load DIPS XML flys-aft/trunk@3452 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Fri, 16 Dec 2011 16:21:59 +0000
parents 88f801888d85
children 44dc38ca8492
rev   line source
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d09adfa90942 Added XML/XPath support.
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1 package de.intevation.utils;
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2
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3 import java.io.FileInputStream;
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4 import java.io.BufferedInputStream;
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5 import java.io.File;
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6 import java.io.IOException;
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7 import java.io.InputStream;
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8
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9 import org.w3c.dom.Document;
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10
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11 import javax.xml.parsers.DocumentBuilderFactory;
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12 import javax.xml.parsers.ParserConfigurationException;
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13
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14 import org.xml.sax.SAXException;
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15
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16 import org.apache.log4j.Logger;
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17
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18 import java.util.HashMap;
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19 import java.util.Map;
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20
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21 import javax.xml.namespace.NamespaceContext;
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22 import javax.xml.namespace.QName;
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23
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24 import javax.xml.xpath.XPath;
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25 import javax.xml.xpath.XPathExpressionException;
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26 import javax.xml.xpath.XPathFactory;
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27 import javax.xml.xpath.XPathVariableResolver;
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28
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29 public final class XML
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30 {
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31 /** Logger for this class. */
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32 private static Logger log = Logger.getLogger(XML.class);
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33
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34 public static class MapXPathVariableResolver
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35 implements XPathVariableResolver
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36 {
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37 protected Map<String, String> variables;
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38
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39
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40 public MapXPathVariableResolver() {
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41 this.variables = new HashMap<String, String>();
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42 }
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43
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44
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45 public MapXPathVariableResolver(Map<String, String> variables) {
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46 this.variables = variables;
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47 }
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48
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49
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50 public void addVariable(String name, String value) {
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51 variables.put(name, value);
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52 }
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53
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54
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55 @Override
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56 public Object resolveVariable(QName variableName) {
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57 String key = variableName.getLocalPart();
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58 return variables.get(key);
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59 }
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60 } // class MapXPathVariableResolver
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61
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62 private XML() {
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63 }
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64
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65 /**
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66 * Loads a XML document namespace aware from a file
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67 * @param file The file to load.
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68 * @return the XML document or null if something went wrong
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69 * during loading.
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70 */
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71 public static final Document parseDocument(File file) {
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72 return parseDocument(file, Boolean.TRUE);
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73 }
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74
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75 public static final Document parseDocument(File file, Boolean namespaceAware) {
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76 InputStream inputStream = null;
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77 try {
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78 inputStream = new BufferedInputStream(new FileInputStream(file));
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79 return parseDocument(inputStream, namespaceAware);
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80 }
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81 catch (IOException ioe) {
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82 log.error(ioe.getLocalizedMessage(), ioe);
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83 }
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84 finally {
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85 if (inputStream != null) {
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86 try { inputStream.close(); }
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87 catch (IOException ioe) {}
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88 }
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89 }
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90 return null;
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91 }
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92
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93
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94 public static final Document parseDocument(InputStream inputStream) {
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95 return parseDocument(inputStream, Boolean.TRUE);
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96 }
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97
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98 public static final Document parseDocument(
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99 InputStream inputStream,
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100 Boolean namespaceAware
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101 ) {
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102 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
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103
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104 if (namespaceAware != null) {
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105 factory.setNamespaceAware(namespaceAware.booleanValue());
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106 }
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107
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108 try {
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109 return factory.newDocumentBuilder().parse(inputStream);
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110 }
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111 catch (ParserConfigurationException pce) {
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112 log.error(pce.getLocalizedMessage(), pce);
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113 }
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114 catch (SAXException se) {
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115 log.error(se.getLocalizedMessage(), se);
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116 }
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117 catch (IOException ioe) {
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118 log.error(ioe.getLocalizedMessage(), ioe);
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119 }
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120 return null;
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121 }
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122
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123
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124 /**
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125 * Creates a new XPath without a namespace context.
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126 * @return the new XPath.
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127 */
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128 public static final XPath newXPath() {
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129 return newXPath(null, null);
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130 }
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131
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132 /**
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133 * Creates a new XPath with a given namespace context.
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134 * @param namespaceContext The namespace context to be used or null
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135 * if none should be used.
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136 * @return The new XPath
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137 */
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138 public static final XPath newXPath(
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139 NamespaceContext namespaceContext,
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140 XPathVariableResolver resolver)
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141 {
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142 XPathFactory factory = XPathFactory.newInstance();
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143 XPath xpath = factory.newXPath();
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144 if (namespaceContext != null) {
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145 xpath.setNamespaceContext(namespaceContext);
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146 }
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147
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148 if (resolver != null) {
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149 xpath.setXPathVariableResolver(resolver);
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150 }
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151 return xpath;
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152 }
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153
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154 /**
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155 * Evaluates an XPath query on a given object and returns the result
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156 * as a given type. No namespace context is used.
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157 * @param root The object which is used as the root of the tree to
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158 * be searched in.
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159 * @param query The XPath query
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160 * @param returnTyp The type of the result.
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161 * @return The result of type 'returnTyp' or null if something
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162 * went wrong during XPath evaluation.
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163 */
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164 public static final Object xpath(
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165 Object root,
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166 String query,
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167 QName returnTyp
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168 ) {
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169 return xpath(root, query, returnTyp, null);
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170 }
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171
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172 /**
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173 * Evaluates an XPath query on a given object and returns the result
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174 * as a given type. Optionally a namespace context is used.
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175 * @param root The object which is used as the root of the tree to
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176 * be searched in.
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177 * @param query The XPath query
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178 * @param returnType The type of the result.
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179 * @param namespaceContext The namespace context to be used or null
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180 * if none should be used.
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181 * @return The result of type 'returnTyp' or null if something
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182 * went wrong during XPath evaluation.
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183 */
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184 public static final Object xpath(
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185 Object root,
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186 String query,
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187 QName returnType,
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188 NamespaceContext namespaceContext
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189 ) {
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190 return xpath(root, query, returnType, namespaceContext, null);
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191 }
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192
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193 public static final Object xpath(
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194 Object root,
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195 String query,
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196 QName returnType,
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197 NamespaceContext namespaceContext,
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198 Map<String, String> variables)
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199 {
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200 if (root == null) {
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201 return null;
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202 }
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203
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204 XPathVariableResolver resolver = variables != null
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205 ? new MapXPathVariableResolver(variables)
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206 : null;
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207
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208 try {
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209 XPath xpath = newXPath(namespaceContext, resolver);
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210 if (xpath != null) {
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211 return xpath.evaluate(query, root, returnType);
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212 }
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213 }
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214 catch (XPathExpressionException xpee) {
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215 log.error(xpee.getLocalizedMessage(), xpee);
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216 }
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217
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218 return null;
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219 }
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220 }
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221 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org