Mercurial > dive4elements > http-client

annotate src/main/java/de/intevation/artifacts/httpclient/utils/XMLUtils.java @ 2:2fdfa20cfa63

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Added an interface that is used to create instances of artifacts depending on the framework that includes this lib. The create() method of the HttpClient makes use of this interface. http-client/trunk@1325 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Thu, 17 Feb 2011 11:19:02 +0000
parents a1db30b33f43
children 0359c4f3b4a1
rev   line source
0
a1db30b33f43 Moved the experimental branch 'work-on-gwt' of the console-client to an own module 'http-client' and removed the console-client.
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1 /*
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2 * Copyright (c) 2010 by Intevation GmbH
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3 *
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4 * This program is free software under the LGPL (>=v2.1)
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5 * Read the file LGPL.txt coming with the software for details
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6 * or visit http://www.gnu.org/licenses/ if it does not exist.
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7 */
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8
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9 package de.intevation.artifacts.httpclient.utils;
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10
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11 import java.io.IOException;
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12 import java.io.InputStream;
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13 import java.io.OutputStream;
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14 import java.io.StringBufferInputStream;
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15 import java.io.StringWriter;
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16
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17 import javax.xml.namespace.NamespaceContext;
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18 import javax.xml.namespace.QName;
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19 import javax.xml.parsers.DocumentBuilder;
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20 import javax.xml.parsers.DocumentBuilderFactory;
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21 import javax.xml.parsers.ParserConfigurationException;
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22 import javax.xml.transform.Transformer;
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23 import javax.xml.transform.TransformerConfigurationException;
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24 import javax.xml.transform.TransformerException;
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25 import javax.xml.transform.TransformerFactory;
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26 import javax.xml.transform.TransformerFactoryConfigurationError;
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27 import javax.xml.transform.dom.DOMSource;
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28 import javax.xml.transform.stream.StreamResult;
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29 import javax.xml.xpath.XPath;
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30 import javax.xml.xpath.XPathConstants;
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31 import javax.xml.xpath.XPathExpressionException;
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32 import javax.xml.xpath.XPathFactory;
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33
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34 import org.apache.log4j.Logger;
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35 import org.w3c.dom.Attr;
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36 import org.w3c.dom.Document;
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37 import org.w3c.dom.Element;
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38 import org.w3c.dom.Node;
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39 import org.w3c.dom.NodeList;
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40 import org.xml.sax.SAXException;
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41
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42 /**
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43 * This class provides many helper-Methods for handling different kinds of
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44 * XML-stuff.
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45 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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46 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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47 */
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48 public class XMLUtils {
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49
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50 /**
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51 * the logger, used to log exceptions and additonaly information
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52 */
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53 private static Logger logger = Logger.getLogger(XMLUtils.class);
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54
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55 /**
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56 * Constructor
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57 */
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58 public XMLUtils() {
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59 }
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60
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61 /**
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62 * Class which could be used to create XML-Elements
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63 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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64 *
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65 */
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66 public static class ElementCreator {
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67
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68 /**
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69 * The document the elements should be placed in.
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70 */
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71 protected Document document;
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72
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73 /**
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74 * The namespace that should be used.
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75 */
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76 protected String ns;
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77
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78 /**
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79 * The prefix of the namespace that should be used.
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80 */
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81 protected String prefix;
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82
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83 /**
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84 * Constructor
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85 * @param document the document the elements should be placed in
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86 * @param ns the namespace that should be used
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87 * @param prefix the prefix of the namespace that should be used
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88 */
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89 public ElementCreator(Document document, String ns, String prefix) {
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90 this.document = document;
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91 this.ns = ns;
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92 this.prefix = prefix;
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93 }
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94
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95 /**
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96 * Creates a new element using the given name.
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97 * @param name the name of the new element.
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98 * @return the new element
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99 */
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100 public Element create(String name) {
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101 Element element = document.createElementNS(ns, name);
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102 element.setPrefix(prefix);
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103 return element;
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104 }
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105
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106 /**
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107 * Adds a new attribute to the given element.
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108 * @param element the element where the attribute should be placed in.
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109 * @param name the name of the attribute
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110 * @param value the value of the attribute
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111 */
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112 public void addAttr(Element element, String name, String value) {
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113 Attr attr = document.createAttributeNS(ns, name);
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114 attr.setValue(value);
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115 attr.setPrefix(prefix);
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116 element.setAttributeNode(attr);
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117 }
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118 } // class ElementCreator
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119
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120 /**
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121 * Creates a new document.
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122 * @return the new document
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123 */
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124 public static Document newDocument() {
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125 try {
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126 return DocumentBuilderFactory.newInstance().newDocumentBuilder()
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127 .newDocument();
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128 } catch (ParserConfigurationException pce) {
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129 logger.error(pce.getLocalizedMessage(), pce);
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130 }
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131 return null;
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132 }
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133
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134 /**
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135 * Creates a new <code>XPath</code>-expression
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136 * @return the new <code>XPath</code>-expression
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137 */
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138 public static XPath newXPath() {
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139 return newXPath(null);
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140 }
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141
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142 /**
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143 * Creates a new <code>XPath</code>-expression
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144 * @param namespaceContext the namespacecontext that should be used.
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145 * @return the new <code>XPath</code>-expression
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146 */
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147 public static XPath newXPath(NamespaceContext namespaceContext) {
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148 XPathFactory factory = XPathFactory.newInstance();
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149 XPath xpath = factory.newXPath();
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150 if (namespaceContext != null) {
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151 xpath.setNamespaceContext(namespaceContext);
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152 }
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153 return xpath;
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154 }
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155
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156 /**
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157 * Fetch the value of an element or attribute from the given resource
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158 * using the query.
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159 * @param root the source where the value should be fetch from
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160 * @param query the query that should be used to fetch the value
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161 * @param namespaceContext the namespacecontext that must match to
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162 * fetch the value.
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163 * @return the value
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164 */
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165 public static final String xpathString(Object root, String query,
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166 NamespaceContext namespaceContext) {
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167 return (String) xpath(root, query, XPathConstants.STRING,
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168 namespaceContext);
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169 }
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170
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171 /**
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172 * Fetch the object rom the given resource using the query.
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173 * @param root the source where the value should be fetch from
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174 * @param query the query that should be used to fetch the object
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175 * @param returnType the Type that must be used to return the object,
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176 * @param namespaceContext the namespacecontext that must match to
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177 * fetch the object.
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178 * @return the value
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179 */
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180 public static final Object xpath(Object root, String query,
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181 QName returnType,
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182 NamespaceContext namespaceContext) {
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183 if (root == null) {
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184 return null;
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185 }
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186 try {
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187 XPath xpath = XMLUtils.newXPath(namespaceContext);
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188 if (xpath != null) {
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189 return xpath.evaluate(query, root, returnType);
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190 }
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191 } catch (XPathExpressionException xpee) {
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192 logger.error(xpee.getLocalizedMessage(), xpee);
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193 }
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194 return null;
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195 }
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196
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197 /**
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198 * Fetch the object rom the given resource using the query
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199 * and the default <code>ArtifactNamespaceContext</code>
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200 * @param root the source where the value should be fetch from
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201 * @param query the query that should be used to fetch the object
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202 * @param returnType the Type that must be used to return the object
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203 * @return the value
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204 */
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205 public static Object getXPath(Object root, String query, QName returnType) {
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206 return getXPath(root,query,returnType,ArtifactNamespaceContext.INSTANCE);
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207 }
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208
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209 /**
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210 * Fetch the object rom the given resource using the query
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211 * and the default <code>ArtifactNamespaceContext</code>
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212 * @param root the source where the value should be fetch from
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213 * @param query the query that should be used to fetch the object
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214 * @param returnType the Type that must be used to return the object.
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215 * @param context the namespacecontext that must match to
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216 * fetch the object.
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217 * @return the value
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218 */
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219 public static Object getXPath(
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220 Object root, String query, QName returnType, NamespaceContext context
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221 ) {
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222 return xpath(root, query, returnType, context);
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223 }
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224
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225 /**
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226 * Fetch a Nodeset value from a XML-Fragment or XML-Document using the
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227 * given query.
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228 * @param root the source where the String should be fetched from
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229 * @param query the query that should be used,
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230 * @return the Nodeset fetched from the source
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231 */
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232 public static NodeList getNodeSetXPath(Object root, String query) {
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233 return (NodeList) getXPath(root, query, XPathConstants.NODESET);
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234 }
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235
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236 /**
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237 * Fetch a Node from a XML-Fragment or XML-Document using the
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238 * given query.
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239 * @param root the source where the Node should be fetched from
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240 * @param query the query that should be used,
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241 * @return the Node fetched from the source
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242 */
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243 public static Node getNodeXPath(Object root, String query) {
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244 return (Node) getXPath(root, query, XPathConstants.NODE);
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245 }
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246
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247 /**
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248 * Fetch a String value from a XML-Fragment or XML-Document using the
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249 * given query.
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250 * @param root the source where the String should be fetched from
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251 * @param xpath the query that should be used,
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252 * @return the String fetched from the source
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253 */
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254 public static String getStringXPath(Object root, String xpath) {
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255 return getStringXPath(root, xpath, null);
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256 }
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257
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258 /**
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259 * Fetch a String value from a XML-Fragment or XML-Document using the
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260 * given query.
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261 * @param root the source where the String should be fetched from
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262 * @param query the query that should be used,
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263 * @param def the default-value that will be returned id no value was found
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264 * @return the String fetched from the source
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265 */
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266 public static String getStringXPath(Object root, String query, String def) {
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267 String s = (String) getXPath(root, query, XPathConstants.STRING);
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268 return s == null || s.length() == 0 ? def : s;
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269 }
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270
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271 /**
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272 * Reads an XML-document from a given <code>InputStream</code>
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273 * @param inputStream the <code>InputStream</code> where the document
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274 * should be read from
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275 * @return the document that could be read.
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276 */
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277 public static Document readDocument(InputStream inputStream) {
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278 Document returnValue = null;
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279 try {
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280 DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory
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281 .newInstance();
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282 docBuilderFactory.setNamespaceAware(true);
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283 DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder();
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284 returnValue = docBuilder.parse(inputStream);
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285 } catch (ParserConfigurationException e) {
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286 logger.error(e, e);
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287 } catch (SAXException e) {
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288 logger.error(e, e);
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289 } catch (IOException e) {
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290 logger.error(e, e);
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291 }
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292 return returnValue;
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293 }
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294
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295 /**
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296 * Writes a given Document to an <code>OutputStream</code>
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297 * @param document the document that should be written
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298 * @param out the stream where the document should be written to,
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299 * @return true if it was successful, false if not.
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300 */
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301 public static boolean toStream(Document document, OutputStream out) {
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302 try {
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303 Transformer transformer =
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304 TransformerFactory.newInstance().newTransformer();
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305 DOMSource source = new DOMSource(document);
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306 StreamResult result = new StreamResult(out);
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307 transformer.transform(source, result);
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308 return true;
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309 }
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310 catch (TransformerConfigurationException tce) {
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311 logger.error(tce.getLocalizedMessage(), tce);
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312 }
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313 catch (TransformerFactoryConfigurationError tfce) {
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314 logger.error(tfce.getLocalizedMessage(), tfce);
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315 }
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316 catch (TransformerException te) {
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317 logger.error(te.getLocalizedMessage(), te);
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318 }
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319 return false;
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320 }
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321 }
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322 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8:
http://dive4elements.wald.intevation.org