Mercurial > dive4elements > framework

annotate artifacts-common/src/main/java/de/intevation/artifacts/common/utils/XMLUtils.java @ 323:1d3607ceb9fa

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Improved the XMLUtils to support xpath expressions that contain variables. artifacts/trunk@2540 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Wed, 24 Aug 2011 07:44:11 +0000
parents 715bdf990739
children e7d3f74854fb
rev   line source
102
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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.common.utils;
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10
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11 import java.util.Map;
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12 import java.util.zip.GZIPInputStream;
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13 import java.util.zip.GZIPOutputStream;
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14
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15 import java.io.ByteArrayInputStream;
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16 import java.io.FileInputStream;
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17 import java.io.BufferedInputStream;
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18 import java.io.ByteArrayOutputStream;
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19 import java.io.File;
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20 import java.io.IOException;
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21 import java.io.InputStream;
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22 import java.io.OutputStream;
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23 import java.io.StringWriter;
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24
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25 import javax.xml.namespace.NamespaceContext;
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26 import javax.xml.namespace.QName;
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27
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28 import javax.xml.parsers.DocumentBuilderFactory;
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29 import javax.xml.parsers.ParserConfigurationException;
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30
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31 import javax.xml.transform.Transformer;
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32 import javax.xml.transform.TransformerConfigurationException;
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33 import javax.xml.transform.TransformerException;
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34 import javax.xml.transform.TransformerFactory;
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35 import javax.xml.transform.TransformerFactoryConfigurationError;
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36
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37 import javax.xml.transform.dom.DOMSource;
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38
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39 import javax.xml.transform.stream.StreamResult;
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40
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41 import javax.xml.xpath.XPath;
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42 import javax.xml.xpath.XPathConstants;
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43 import javax.xml.xpath.XPathExpressionException;
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44 import javax.xml.xpath.XPathFactory;
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45 import javax.xml.xpath.XPathVariableResolver;
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46
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47 import org.apache.log4j.Logger;
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48
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49 import org.w3c.dom.Attr;
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50 import org.w3c.dom.Document;
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51 import org.w3c.dom.Element;
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52
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53 import org.xml.sax.SAXException;
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54
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55 /**
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56 * Some helper functions to ease work with XML concering namespaces, XPATH
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57 * and so on.
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58 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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59 */
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60 public final class XMLUtils
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61 {
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62 /**
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63 * W3C URL of XForms
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64 */
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65 public static final String XFORM_URL = "http://www.w3.org/2002/xforms";
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66 /**
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67 * W3C prefix of XForms
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68 */
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69 public static final String XFORM_PREFIX = "xform";
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70
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71 private static Logger logger = Logger.getLogger(XMLUtils.class);
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72
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73 private XMLUtils() {
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74 }
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75
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76 /**
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77 * Helper class to generate elements and attributes with
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78 * namespaces.
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79 */
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80 public static class ElementCreator
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81 {
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82 /**
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83 * owner document of the elements to be created
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84 */
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85 protected Document document;
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86 /**
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87 * namespace to be used
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88 */
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89 protected String ns;
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90 /**
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91 * prefix to be used
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92 */
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93 protected String prefix;
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94
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95 /**
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96 * Constructor to create an element/attribute creator
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97 * with a given namespace and namespace prefix using a
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98 * given owner document.
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99 * @param document The owning document
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100 * @param ns The namespace
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101 * @param prefix The namespace prefix
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102 */
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103 public ElementCreator(Document document, String ns, String prefix) {
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104 this.document = document;
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105 this.ns = ns;
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106 this.prefix = prefix;
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107 }
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108
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109 /**
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110 * Creates a new element using the owning document with
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111 * the this creators namespace and namespace prefix.
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112 * @param name The name of the element
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113 * @return The new element
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114 */
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115 public Element create(String name) {
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116 Element element = document.createElementNS(ns, name);
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117 element.setPrefix(prefix);
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118 return element;
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119 }
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120
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121 /**
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122 * Adds a new attribute and its value to a given element.
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123 * It does not set the namespace prefix.
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124 * @param element The element to add the attribute to
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125 * @param name The name of the attribute
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126 * @param value The value of the attribute
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127 */
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128 public void addAttr(Element element, String name, String value) {
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129 addAttr(element, name, value, false);
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130 }
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131
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132 /**
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133 * Adds a new attribute and its value to a given element.
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134 * If the namespace prefix is used is decided by the 'addPrefix' flag.
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135 * @param element The element to add the attribute to
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136 * @param name The name of the attribute
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137 * @param value The value of the attribute
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138 * @param addPrefix If true the creators namespace prefix is
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139 * set on the attribute.
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140 */
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141 public void addAttr(
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142 Element element,
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143 String name,
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144 String value,
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145 boolean addPrefix
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146 ) {
202
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147 if (addPrefix) {
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148 Attr attr = document.createAttributeNS(ns, name);
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149 attr.setValue(value);
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150 attr.setPrefix(prefix);
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151
202
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152 element.setAttributeNode(attr);
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153 }
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154 else {
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155 element.setAttribute(name, value);
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156 }
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157
102
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158 }
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159 } // class ElementCreator
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160
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161 /**
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162 * Creates a new XML document
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163 * @return the new XML document ot null if something went wrong during
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164 * creation.
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165 */
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166 public static final Document newDocument() {
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167 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
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168 factory.setNamespaceAware(true);
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169
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170 try {
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171 return factory.newDocumentBuilder().newDocument();
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172 }
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173 catch (ParserConfigurationException pce) {
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174 logger.error(pce.getLocalizedMessage(), pce);
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175 }
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176 return null;
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177 }
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178
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179 /**
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180 * Loads a XML document namespace aware from a file
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181 * @param file The file to load.
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182 * @return the XML document or null if something went wrong
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183 * during loading.
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184 */
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185 public static final Document parseDocument(File file) {
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186 InputStream inputStream = null;
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187 try {
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188 inputStream = new BufferedInputStream(new FileInputStream(file));
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189 return parseDocument(inputStream);
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190 }
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191 catch (IOException ioe) {
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192 logger.error(ioe.getLocalizedMessage(), ioe);
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193 }
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194 finally {
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195 if (inputStream != null) {
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196 try { inputStream.close(); }
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197 catch (IOException ioe) {}
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198 }
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199 }
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200 return null;
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201 }
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202
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203 public static final Document parseDocument(InputStream inputStream) {
102
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204 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
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205 factory.setNamespaceAware(true);
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206
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207 try {
147
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208 return factory.newDocumentBuilder().parse(inputStream);
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209 }
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210 catch (ParserConfigurationException pce) {
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211 logger.error(pce.getLocalizedMessage(), pce);
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212 }
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213 catch (SAXException se) {
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214 logger.error(se.getLocalizedMessage(), se);
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215 }
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216 catch (IOException ioe) {
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217 logger.error(ioe.getLocalizedMessage(), ioe);
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218 }
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219 return null;
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220 }
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221
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222 /**
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223 * Creates a new XPath without a namespace context.
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224 * @return the new XPath.
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225 */
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226 public static final XPath newXPath() {
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227 return newXPath(null, null);
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228 }
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229
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230 /**
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231 * Creates a new XPath with a given namespace context.
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232 * @param namespaceContext The namespace context to be used or null
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233 * if none should be used.
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234 * @return The new XPath
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235 */
323
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236 public static final XPath newXPath(
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237 NamespaceContext namespaceContext,
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238 XPathVariableResolver resolver)
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239 {
102
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240 XPathFactory factory = XPathFactory.newInstance();
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241 XPath xpath = factory.newXPath();
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242 if (namespaceContext != null) {
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243 xpath.setNamespaceContext(namespaceContext);
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244 }
323
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245
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246 if (resolver != null) {
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247 xpath.setXPathVariableResolver(resolver);
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248 }
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249 return xpath;
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250 }
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251
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252 /**
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253 * Evaluates an XPath query on a given object and returns the result
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254 * as a given type. No namespace context is used.
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255 * @param root The object which is used as the root of the tree to
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256 * be searched in.
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257 * @param query The XPath query
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258 * @param returnTyp The type of the result.
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259 * @return The result of type 'returnTyp' or null if something
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260 * went wrong during XPath evaluation.
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261 */
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262 public static final Object xpath(
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263 Object root,
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264 String query,
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265 QName returnTyp
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266 ) {
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267 return xpath(root, query, returnTyp, null);
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268 }
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269
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270 /**
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271 * Evaluates an XPath query on a given object and returns the result
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272 * as a string. A given namespace context is used.
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273 * @param root The object which is used as the root of the tree to
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274 * be searched in.
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275 * @param query The XPath query
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276 * @param namespaceContext The namespace context to be used or null
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277 * if none should be used.
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278 * @return The result of the query or null if something went wrong
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279 * during XPath evaluation.
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280 */
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281 public static final String xpathString(
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282 Object root, String query, NamespaceContext namespaceContext
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283 ) {
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284 return (String)xpath(
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285 root, query, XPathConstants.STRING, namespaceContext);
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286 }
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287
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288 /**
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289 * Evaluates an XPath query on a given object and returns the result
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290 * as a given type. Optionally a namespace context is used.
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291 * @param root The object which is used as the root of the tree to
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292 * be searched in.
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293 * @param query The XPath query
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294 * @param returnType The type of the result.
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295 * @param namespaceContext The namespace context to be used or null
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296 * if none should be used.
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297 * @return The result of type 'returnTyp' or null if something
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298 * went wrong during XPath evaluation.
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299 */
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300 public static final Object xpath(
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301 Object root,
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302 String query,
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303 QName returnType,
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304 NamespaceContext namespaceContext
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305 ) {
323
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306 return xpath(root, query, returnType, namespaceContext, null);
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307 }
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308
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309 public static final Object xpath(
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310 Object root,
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311 String query,
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312 QName returnType,
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313 NamespaceContext namespaceContext,
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314 Map<String, String> variables)
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315 {
102
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316 if (root == null) {
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317 return null;
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318 }
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319
323
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320 XPathVariableResolver resolver = variables != null
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321 ? new MapXPathVariableResolver(variables)
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322 : null;
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323
102
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324 try {
323
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325 XPath xpath = newXPath(namespaceContext, resolver);
102
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326 if (xpath != null) {
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327 return xpath.evaluate(query, root, returnType);
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328 }
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329 }
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330 catch (XPathExpressionException xpee) {
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331 logger.error(xpee.getLocalizedMessage(), xpee);
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332 }
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333
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334 return null;
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335 }
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336
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337 /**
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338 * Streams out an XML document to a given output stream.
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339 * @param document The document to be streamed out.
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340 * @param out The output stream to be used.
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341 * @return true if operation succeeded else false.
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342 */
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343 public static boolean toStream(Document document, OutputStream out) {
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344 try {
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345 Transformer transformer =
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346 TransformerFactory.newInstance().newTransformer();
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347 DOMSource source = new DOMSource(document);
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348 StreamResult result = new StreamResult(out);
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349 transformer.transform(source, result);
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350 return true;
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351 }
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352 catch (TransformerConfigurationException tce) {
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353 logger.error(tce.getLocalizedMessage(), tce);
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354 }
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355 catch (TransformerFactoryConfigurationError tfce) {
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356 logger.error(tfce.getLocalizedMessage(), tfce);
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357 }
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358 catch (TransformerException te) {
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359 logger.error(te.getLocalizedMessage(), te);
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360 }
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361
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362 return false;
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363 }
135
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364
286
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365 public static String toString(Document document) {
276
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366 try {
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367 Transformer transformer =
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368 TransformerFactory.newInstance().newTransformer();
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369 DOMSource source = new DOMSource(document);
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370 StringWriter out = new StringWriter();
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371 StreamResult result = new StreamResult(out);
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372 transformer.transform(source, result);
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373 out.flush();
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374 return out.toString();
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375 }
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376 catch (TransformerConfigurationException tce) {
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377 logger.error(tce.getLocalizedMessage(), tce);
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378 }
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379 catch (TransformerFactoryConfigurationError tfce) {
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380 logger.error(tfce.getLocalizedMessage(), tfce);
8b58259d3dd3 Added static toString(Document) method which transform XML documents to Strings.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 234
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381 }
8b58259d3dd3 Added static toString(Document) method which transform XML documents to Strings.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 234
diff changeset
382 catch (TransformerException te) {
8b58259d3dd3 Added static toString(Document) method which transform XML documents to Strings.
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parents: 234
diff changeset
383 logger.error(te.getLocalizedMessage(), te);
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 234
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384 }
8b58259d3dd3 Added static toString(Document) method which transform XML documents to Strings.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 234
diff changeset
385
8b58259d3dd3 Added static toString(Document) method which transform XML documents to Strings.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 234
diff changeset
386 return null;
8b58259d3dd3 Added static toString(Document) method which transform XML documents to Strings.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 234
diff changeset
387 }
8b58259d3dd3 Added static toString(Document) method which transform XML documents to Strings.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 234
diff changeset
388
234
23d642319a0b Added a boolean flag to XML byte serialisation to compress/decompress, too.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 202
diff changeset
389 public static byte [] toByteArray(Document document) {
23d642319a0b Added a boolean flag to XML byte serialisation to compress/decompress, too.
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parents: 202
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390 return toByteArray(document, false);
23d642319a0b Added a boolean flag to XML byte serialisation to compress/decompress, too.
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parents: 202
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391 }
23d642319a0b Added a boolean flag to XML byte serialisation to compress/decompress, too.
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parents: 202
diff changeset
392
135
a48882c9e096 Added a convinience method to transform an document into a byte array.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 103
diff changeset
393 /**
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parents: 103
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394 * Transforms an XML document into a byte array.
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parents: 103
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395 * @param document The document to be streamed out.
234
23d642319a0b Added a boolean flag to XML byte serialisation to compress/decompress, too.
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parents: 202
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396 * @param compress The document should be compressed, too.
135
a48882c9e096 Added a convinience method to transform an document into a byte array.
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parents: 103
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397 * @return the byte array or null if operation failed or
a48882c9e096 Added a convinience method to transform an document into a byte array.
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parents: 103
diff changeset
398 * document is null.
a48882c9e096 Added a convinience method to transform an document into a byte array.
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parents: 103
diff changeset
399 */
234
23d642319a0b Added a boolean flag to XML byte serialisation to compress/decompress, too.
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parents: 202
diff changeset
400 public static byte [] toByteArray(Document document, boolean compress) {
23d642319a0b Added a boolean flag to XML byte serialisation to compress/decompress, too.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 202
diff changeset
401 if (document != null) {
23d642319a0b Added a boolean flag to XML byte serialisation to compress/decompress, too.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 202
diff changeset
402 try {
23d642319a0b Added a boolean flag to XML byte serialisation to compress/decompress, too.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 202
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403 ByteArrayOutputStream baos = new ByteArrayOutputStream();
23d642319a0b Added a boolean flag to XML byte serialisation to compress/decompress, too.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 202
diff changeset
404 OutputStream out = compress
23d642319a0b Added a boolean flag to XML byte serialisation to compress/decompress, too.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 202
diff changeset
405 ? new GZIPOutputStream(baos)
23d642319a0b Added a boolean flag to XML byte serialisation to compress/decompress, too.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 202
diff changeset
406 : baos;
23d642319a0b Added a boolean flag to XML byte serialisation to compress/decompress, too.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 202
diff changeset
407 boolean success = toStream(document, out);
23d642319a0b Added a boolean flag to XML byte serialisation to compress/decompress, too.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 202
diff changeset
408 out.flush();
23d642319a0b Added a boolean flag to XML byte serialisation to compress/decompress, too.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 202
diff changeset
409 out.close();
23d642319a0b Added a boolean flag to XML byte serialisation to compress/decompress, too.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 202
diff changeset
410 return success
23d642319a0b Added a boolean flag to XML byte serialisation to compress/decompress, too.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 202
diff changeset
411 ? baos.toByteArray()
23d642319a0b Added a boolean flag to XML byte serialisation to compress/decompress, too.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 202
diff changeset
412 : null;
23d642319a0b Added a boolean flag to XML byte serialisation to compress/decompress, too.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 202
diff changeset
413 }
23d642319a0b Added a boolean flag to XML byte serialisation to compress/decompress, too.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 202
diff changeset
414 catch (IOException ioe) {
23d642319a0b Added a boolean flag to XML byte serialisation to compress/decompress, too.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 202
diff changeset
415 logger.error(ioe);
23d642319a0b Added a boolean flag to XML byte serialisation to compress/decompress, too.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 202
diff changeset
416 }
135
a48882c9e096 Added a convinience method to transform an document into a byte array.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 103
diff changeset
417 }
234
23d642319a0b Added a boolean flag to XML byte serialisation to compress/decompress, too.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 202
diff changeset
418 return null;
135
a48882c9e096 Added a convinience method to transform an document into a byte array.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 103
diff changeset
419 }
147
9a64e0c1c737 Added code to load user from database.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 135
diff changeset
420
9a64e0c1c737 Added code to load user from database.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 135
diff changeset
421 public static Document fromByteArray(byte [] data) {
234
23d642319a0b Added a boolean flag to XML byte serialisation to compress/decompress, too.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 202
diff changeset
422 return fromByteArray(data, false);
23d642319a0b Added a boolean flag to XML byte serialisation to compress/decompress, too.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 202
diff changeset
423 }
23d642319a0b Added a boolean flag to XML byte serialisation to compress/decompress, too.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 202
diff changeset
424
23d642319a0b Added a boolean flag to XML byte serialisation to compress/decompress, too.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 202
diff changeset
425 public static Document fromByteArray(byte [] data, boolean decompress) {
23d642319a0b Added a boolean flag to XML byte serialisation to compress/decompress, too.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 202
diff changeset
426 if (data != null) {
23d642319a0b Added a boolean flag to XML byte serialisation to compress/decompress, too.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 202
diff changeset
427 InputStream in = new ByteArrayInputStream(data);
23d642319a0b Added a boolean flag to XML byte serialisation to compress/decompress, too.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 202
diff changeset
428 try {
23d642319a0b Added a boolean flag to XML byte serialisation to compress/decompress, too.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 202
diff changeset
429 if (decompress) {
23d642319a0b Added a boolean flag to XML byte serialisation to compress/decompress, too.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 202
diff changeset
430 in = new GZIPInputStream(in);
23d642319a0b Added a boolean flag to XML byte serialisation to compress/decompress, too.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 202
diff changeset
431 }
23d642319a0b Added a boolean flag to XML byte serialisation to compress/decompress, too.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 202
diff changeset
432 return parseDocument(in);
23d642319a0b Added a boolean flag to XML byte serialisation to compress/decompress, too.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 202
diff changeset
433 }
23d642319a0b Added a boolean flag to XML byte serialisation to compress/decompress, too.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 202
diff changeset
434 catch (IOException ioe) {
23d642319a0b Added a boolean flag to XML byte serialisation to compress/decompress, too.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 202
diff changeset
435 logger.error(ioe);
23d642319a0b Added a boolean flag to XML byte serialisation to compress/decompress, too.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 202
diff changeset
436 }
23d642319a0b Added a boolean flag to XML byte serialisation to compress/decompress, too.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 202
diff changeset
437 finally {
23d642319a0b Added a boolean flag to XML byte serialisation to compress/decompress, too.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 202
diff changeset
438 try {
23d642319a0b Added a boolean flag to XML byte serialisation to compress/decompress, too.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 202
diff changeset
439 in.close();
23d642319a0b Added a boolean flag to XML byte serialisation to compress/decompress, too.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 202
diff changeset
440 }
23d642319a0b Added a boolean flag to XML byte serialisation to compress/decompress, too.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 202
diff changeset
441 catch (IOException ioe) {
23d642319a0b Added a boolean flag to XML byte serialisation to compress/decompress, too.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 202
diff changeset
442 logger.error(ioe);
23d642319a0b Added a boolean flag to XML byte serialisation to compress/decompress, too.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 202
diff changeset
443 }
23d642319a0b Added a boolean flag to XML byte serialisation to compress/decompress, too.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 202
diff changeset
444 }
147
9a64e0c1c737 Added code to load user from database.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 135
diff changeset
445 }
234
23d642319a0b Added a boolean flag to XML byte serialisation to compress/decompress, too.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 202
diff changeset
446 return null;
147
9a64e0c1c737 Added code to load user from database.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 135
diff changeset
447 }
102
4122dbc9711b Added a new package artifacts-common for classes and utilities used in several packages.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
diff changeset
448 }
4122dbc9711b Added a new package artifacts-common for classes and utilities used in several packages.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
diff changeset
449 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org