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annotate artifact-database/src/main/java/de/intevation/artifactdatabase/XMLUtils.java @ 67:ed03cc0e5800

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Added method to XMLUtils to copy an XML document to an output stream. artifacts/trunk@553 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Sun, 17 Jan 2010 14:00:06 +0000
parents 8b72676698b5
children 48d1a9a082c2
rev   line source
20
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1 package de.intevation.artifactdatabase;
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2
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3 import java.io.File;
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4 import java.io.IOException;
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5 import java.io.OutputStream;
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6
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7 import javax.xml.namespace.NamespaceContext;
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8 import javax.xml.namespace.QName;
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9
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10 import javax.xml.parsers.DocumentBuilderFactory;
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11 import javax.xml.parsers.ParserConfigurationException;
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12
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13 import javax.xml.transform.Transformer;
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14 import javax.xml.transform.TransformerConfigurationException;
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15 import javax.xml.transform.TransformerException;
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16 import javax.xml.transform.TransformerFactory;
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17 import javax.xml.transform.TransformerFactoryConfigurationError;
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18
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19 import javax.xml.transform.dom.DOMSource;
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21 import javax.xml.transform.stream.StreamResult;
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22
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23 import javax.xml.xpath.XPath;
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24 import javax.xml.xpath.XPathConstants;
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25 import javax.xml.xpath.XPathExpressionException;
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26 import javax.xml.xpath.XPathFactory;
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28 import org.apache.log4j.Logger;
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30 import org.w3c.dom.Attr;
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31 import org.w3c.dom.Document;
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32 import org.w3c.dom.Element;
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33
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34 import org.xml.sax.SAXException;
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35
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36 /**
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37 * @author Sascha L. Teichmann (sascha.teichmann@intevation.de)
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38 */
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39 public final class XMLUtils
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40 {
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41 public static final String XFORM_URL = "http://www.w3.org/2002/xforms";
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42 public static final String XFORM_PREFIX = "xform";
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44 private static Logger logger = Logger.getLogger(XMLUtils.class);
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45
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46 private XMLUtils() {
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47 }
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48
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49 public static class ElementCreator
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50 {
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51 protected Document document;
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52 protected String ns;
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53 protected String prefix;
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54
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55 public ElementCreator(Document document, String ns, String prefix) {
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56 this.document = document;
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57 this.ns = ns;
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58 this.prefix = prefix;
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59 }
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60
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61 public Element create(String name) {
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62 Element element = document.createElementNS(ns, name);
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63 element.setPrefix(prefix);
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64 return element;
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65 }
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66
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67 public void addAttr(Element element, String name, String value) {
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68 addAttr(element, name, value, false);
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69 }
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70
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71 public void addAttr(
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72 Element element,
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73 String name,
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74 String value,
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75 boolean addPrefix
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76 ) {
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77 Attr attr = document.createAttributeNS(ns, name);
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78 attr.setValue(value);
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79
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80 if (addPrefix)
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81 attr.setPrefix(prefix);
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82
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83 element.setAttributeNode(attr);
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84 }
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85 } // class ElementCreator
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86
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87 public static final Document newDocument() {
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88 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
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89 factory.setNamespaceAware(true);
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90
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91 try {
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92 return factory.newDocumentBuilder().newDocument();
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93 }
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94 catch (ParserConfigurationException pce) {
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95 logger.error(pce.getLocalizedMessage(), pce);
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96 }
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97 return null;
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98 }
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99
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100 public static final Document parseDocument(File file) {
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101 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
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102 factory.setNamespaceAware(true);
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103
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104 try {
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105 return factory.newDocumentBuilder().parse(file);
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106 }
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107 catch (ParserConfigurationException pce) {
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108 logger.error(pce.getLocalizedMessage(), pce);
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109 }
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110 catch (SAXException se) {
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111 logger.error(se.getLocalizedMessage(), se);
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112 }
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113 catch (IOException ioe) {
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114 logger.error(ioe.getLocalizedMessage(), ioe);
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115 }
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116 return null;
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117 }
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118
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119 public static final XPath newXPath() {
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120 return newXPath(null);
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121 }
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122
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123 public static final XPath newXPath(NamespaceContext namespaceContext) {
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124 XPathFactory factory = XPathFactory.newInstance();
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125 XPath xpath = factory.newXPath();
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126 if (namespaceContext != null) {
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127 xpath.setNamespaceContext(namespaceContext);
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128 }
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129 return xpath;
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130 }
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131
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132 public static final Object xpath(Object root, String query, QName returnTyp) {
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133 return xpath(root, query, returnTyp, null);
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134 }
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135
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136 public static final String xpathString(
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137 Object root, String query, NamespaceContext namespaceContext
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138 ) {
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139 return (String)xpath(
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140 root, query, XPathConstants.STRING, namespaceContext);
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141 }
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142
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143 public static final Object xpath(
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144 Object root,
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145 String query,
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146 QName returnType,
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147 NamespaceContext namespaceContext
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148 ) {
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149 if (root == null) {
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150 return null;
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151 }
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152
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153 try {
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154 XPath xpath = newXPath(namespaceContext);
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155 if (xpath != null) {
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156 return xpath.evaluate(query, root, returnType);
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157 }
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158 }
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159 catch (XPathExpressionException xpee) {
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160 logger.error(xpee.getLocalizedMessage(), xpee);
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161 }
25
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162
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163 return null;
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164 }
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165
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166 public static boolean toStream(Document document, OutputStream out) {
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167 try {
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168 Transformer transformer =
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169 TransformerFactory.newInstance().newTransformer();
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170 DOMSource source = new DOMSource(document);
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171 StreamResult result = new StreamResult(out);
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172 transformer.transform(source, result);
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173 return true;
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174 }
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175 catch (TransformerConfigurationException tce) {
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176 logger.error(tce.getLocalizedMessage(), tce);
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177 }
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178 catch (TransformerFactoryConfigurationError tfce) {
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179 logger.error(tfce.getLocalizedMessage(), tfce);
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180 }
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181 catch (TransformerException te) {
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182 logger.error(te.getLocalizedMessage(), te);
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183 }
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184
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185 return false;
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186 }
20
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187 }
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188 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8:
http://dive4elements.wald.intevation.org