Mercurial > dive4elements > framework

annotate artifacts-common/src/main/java/de/intevation/artifacts/common/utils/XMLUtils.java @ 276:8b58259d3dd3

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Added static toString(Document) method which transform XML documents to Strings. artifacts/trunk@2093 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Thu, 09 Jun 2011 09:33:29 +0000
parents 23d642319a0b
children 715bdf990739
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
103
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9 package de.intevation.artifacts.common.utils;
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10
234
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11 import java.util.zip.GZIPInputStream;
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12 import java.util.zip.GZIPOutputStream;
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13
147
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14 import java.io.ByteArrayInputStream;
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15 import java.io.FileInputStream;
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16 import java.io.BufferedInputStream;
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17 import java.io.ByteArrayOutputStream;
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18 import java.io.File;
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19 import java.io.IOException;
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20 import java.io.InputStream;
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21 import java.io.OutputStream;
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22 import java.io.StringWriter;
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23
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24 import javax.xml.namespace.NamespaceContext;
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25 import javax.xml.namespace.QName;
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26
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27 import javax.xml.parsers.DocumentBuilderFactory;
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28 import javax.xml.parsers.ParserConfigurationException;
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29
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30 import javax.xml.transform.Transformer;
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31 import javax.xml.transform.TransformerConfigurationException;
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32 import javax.xml.transform.TransformerException;
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33 import javax.xml.transform.TransformerFactory;
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34 import javax.xml.transform.TransformerFactoryConfigurationError;
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35
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36 import javax.xml.transform.dom.DOMSource;
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37
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38 import javax.xml.transform.stream.StreamResult;
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39
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40 import javax.xml.xpath.XPath;
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41 import javax.xml.xpath.XPathConstants;
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42 import javax.xml.xpath.XPathExpressionException;
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43 import javax.xml.xpath.XPathFactory;
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44
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45 import org.apache.log4j.Logger;
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46
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47 import org.w3c.dom.Attr;
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48 import org.w3c.dom.Document;
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49 import org.w3c.dom.Element;
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50
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51 import org.xml.sax.SAXException;
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52
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53 /**
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54 * Some helper functions to ease work with XML concering namespaces, XPATH
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55 * and so on.
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56 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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57 */
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58 public final class XMLUtils
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59 {
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60 /**
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61 * W3C URL of XForms
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62 */
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63 public static final String XFORM_URL = "http://www.w3.org/2002/xforms";
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64 /**
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65 * W3C prefix of XForms
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66 */
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67 public static final String XFORM_PREFIX = "xform";
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68
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69 private static Logger logger = Logger.getLogger(XMLUtils.class);
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70
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71 private XMLUtils() {
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72 }
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73
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74 /**
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75 * Helper class to generate elements and attributes with
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76 * namespaces.
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77 */
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78 public static class ElementCreator
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79 {
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80 /**
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81 * owner document of the elements to be created
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82 */
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83 protected Document document;
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84 /**
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85 * namespace to be used
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86 */
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87 protected String ns;
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88 /**
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89 * prefix to be used
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90 */
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91 protected String prefix;
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92
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93 /**
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94 * Constructor to create an element/attribute creator
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95 * with a given namespace and namespace prefix using a
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96 * given owner document.
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97 * @param document The owning document
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98 * @param ns The namespace
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99 * @param prefix The namespace prefix
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100 */
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101 public ElementCreator(Document document, String ns, String prefix) {
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102 this.document = document;
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103 this.ns = ns;
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104 this.prefix = prefix;
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105 }
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106
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107 /**
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108 * Creates a new element using the owning document with
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109 * the this creators namespace and namespace prefix.
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110 * @param name The name of the element
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111 * @return The new element
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112 */
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113 public Element create(String name) {
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114 Element element = document.createElementNS(ns, name);
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115 element.setPrefix(prefix);
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116 return element;
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117 }
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118
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119 /**
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120 * Adds a new attribute and its value to a given element.
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121 * It does not set the namespace prefix.
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122 * @param element The element to add the attribute to
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123 * @param name The name of the attribute
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124 * @param value The value of the attribute
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125 */
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126 public void addAttr(Element element, String name, String value) {
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127 addAttr(element, name, value, false);
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128 }
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129
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130 /**
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131 * Adds a new attribute and its value to a given element.
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132 * If the namespace prefix is used is decided by the 'addPrefix' flag.
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133 * @param element The element to add the attribute to
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134 * @param name The name of the attribute
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135 * @param value The value of the attribute
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136 * @param addPrefix If true the creators namespace prefix is
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137 * set on the attribute.
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138 */
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139 public void addAttr(
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140 Element element,
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141 String name,
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142 String value,
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143 boolean addPrefix
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144 ) {
202
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145 if (addPrefix) {
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146 Attr attr = document.createAttributeNS(ns, name);
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147 attr.setValue(value);
102
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148 attr.setPrefix(prefix);
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149
202
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150 element.setAttributeNode(attr);
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151 }
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152 else {
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153 element.setAttribute(name, value);
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154 }
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155
102
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156 }
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157 } // class ElementCreator
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158
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159 /**
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160 * Creates a new XML document
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161 * @return the new XML document ot null if something went wrong during
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162 * creation.
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163 */
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164 public static final Document newDocument() {
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165 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
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166 factory.setNamespaceAware(true);
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167
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168 try {
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169 return factory.newDocumentBuilder().newDocument();
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170 }
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171 catch (ParserConfigurationException pce) {
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172 logger.error(pce.getLocalizedMessage(), pce);
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173 }
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174 return null;
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175 }
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176
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177 /**
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178 * Loads a XML document namespace aware from a file
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179 * @param file The file to load.
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180 * @return the XML document or null if something went wrong
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181 * during loading.
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182 */
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183 public static final Document parseDocument(File file) {
147
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184 InputStream inputStream = null;
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185 try {
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186 inputStream = new BufferedInputStream(new FileInputStream(file));
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187 return parseDocument(inputStream);
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188 }
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189 catch (IOException ioe) {
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190 logger.error(ioe.getLocalizedMessage(), ioe);
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191 }
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192 finally {
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193 if (inputStream != null) {
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194 try { inputStream.close(); }
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195 catch (IOException ioe) {}
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196 }
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197 }
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198 return null;
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199 }
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200
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201 public static final Document parseDocument(InputStream inputStream) {
102
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202 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
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203 factory.setNamespaceAware(true);
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204
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205 try {
147
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206 return factory.newDocumentBuilder().parse(inputStream);
102
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207 }
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208 catch (ParserConfigurationException pce) {
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209 logger.error(pce.getLocalizedMessage(), pce);
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210 }
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211 catch (SAXException se) {
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212 logger.error(se.getLocalizedMessage(), se);
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213 }
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214 catch (IOException ioe) {
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215 logger.error(ioe.getLocalizedMessage(), ioe);
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216 }
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217 return null;
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218 }
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219
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220 /**
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221 * Creates a new XPath without a namespace context.
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222 * @return the new XPath.
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223 */
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224 public static final XPath newXPath() {
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225 return newXPath(null);
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226 }
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227
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228 /**
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229 * Creates a new XPath with a given namespace context.
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230 * @param namespaceContext The namespace context to be used or null
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231 * if none should be used.
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232 * @return The new XPath
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233 */
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234 public static final XPath newXPath(NamespaceContext namespaceContext) {
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235 XPathFactory factory = XPathFactory.newInstance();
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236 XPath xpath = factory.newXPath();
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237 if (namespaceContext != null) {
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238 xpath.setNamespaceContext(namespaceContext);
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239 }
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240 return xpath;
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241 }
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242
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243 /**
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244 * Evaluates an XPath query on a given object and returns the result
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245 * as a given type. No namespace context is used.
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246 * @param root The object which is used as the root of the tree to
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247 * be searched in.
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248 * @param query The XPath query
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249 * @param returnTyp The type of the result.
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250 * @return The result of type 'returnTyp' or null if something
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251 * went wrong during XPath evaluation.
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252 */
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253 public static final Object xpath(
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254 Object root,
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255 String query,
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256 QName returnTyp
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257 ) {
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258 return xpath(root, query, returnTyp, null);
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259 }
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260
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261 /**
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262 * Evaluates an XPath query on a given object and returns the result
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263 * as a string. A given namespace context is used.
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264 * @param root The object which is used as the root of the tree to
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265 * be searched in.
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266 * @param query The XPath query
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267 * @param namespaceContext The namespace context to be used or null
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268 * if none should be used.
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269 * @return The result of the query or null if something went wrong
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270 * during XPath evaluation.
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271 */
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272 public static final String xpathString(
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273 Object root, String query, NamespaceContext namespaceContext
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274 ) {
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275 return (String)xpath(
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276 root, query, XPathConstants.STRING, namespaceContext);
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277 }
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278
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279 /**
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280 * Evaluates an XPath query on a given object and returns the result
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281 * as a given type. Optionally a namespace context is used.
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282 * @param root The object which is used as the root of the tree to
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283 * be searched in.
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284 * @param query The XPath query
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285 * @param returnType The type of the result.
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286 * @param namespaceContext The namespace context to be used or null
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287 * if none should be used.
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288 * @return The result of type 'returnTyp' or null if something
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289 * went wrong during XPath evaluation.
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290 */
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291 public static final Object xpath(
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292 Object root,
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293 String query,
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294 QName returnType,
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295 NamespaceContext namespaceContext
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296 ) {
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297 if (root == null) {
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298 return null;
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299 }
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300
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301 try {
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302 XPath xpath = newXPath(namespaceContext);
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303 if (xpath != null) {
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304 return xpath.evaluate(query, root, returnType);
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305 }
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306 }
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307 catch (XPathExpressionException xpee) {
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308 logger.error(xpee.getLocalizedMessage(), xpee);
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309 }
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310
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311 return null;
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312 }
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313
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314 /**
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315 * Streams out an XML document to a given output stream.
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316 * @param document The document to be streamed out.
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317 * @param out The output stream to be used.
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318 * @return true if operation succeeded else false.
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319 */
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320 public static boolean toStream(Document document, OutputStream out) {
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321 try {
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322 Transformer transformer =
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323 TransformerFactory.newInstance().newTransformer();
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324 DOMSource source = new DOMSource(document);
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325 StreamResult result = new StreamResult(out);
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326 transformer.transform(source, result);
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327 return true;
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328 }
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329 catch (TransformerConfigurationException tce) {
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330 logger.error(tce.getLocalizedMessage(), tce);
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331 }
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332 catch (TransformerFactoryConfigurationError tfce) {
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333 logger.error(tfce.getLocalizedMessage(), tfce);
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334 }
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335 catch (TransformerException te) {
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336 logger.error(te.getLocalizedMessage(), te);
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337 }
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338
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339 return false;
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340 }
135
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341
276
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342 public String toString(Document document) {
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343 try {
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344 Transformer transformer =
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345 TransformerFactory.newInstance().newTransformer();
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346 DOMSource source = new DOMSource(document);
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347 StringWriter out = new StringWriter();
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348 StreamResult result = new StreamResult(out);
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349 transformer.transform(source, result);
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350 out.flush();
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351 return out.toString();
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352 }
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353 catch (TransformerConfigurationException tce) {
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354 logger.error(tce.getLocalizedMessage(), tce);
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355 }
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356 catch (TransformerFactoryConfigurationError tfce) {
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357 logger.error(tfce.getLocalizedMessage(), tfce);
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358 }
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359 catch (TransformerException te) {
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360 logger.error(te.getLocalizedMessage(), te);
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361 }
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362
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363 return null;
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364 }
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365
234
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366 public static byte [] toByteArray(Document document) {
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367 return toByteArray(document, false);
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368 }
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369
135
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370 /**
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371 * Transforms an XML document into a byte array.
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372 * @param document The document to be streamed out.
234
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373 * @param compress The document should be compressed, too.
135
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374 * @return the byte array or null if operation failed or
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375 * document is null.
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376 */
234
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377 public static byte [] toByteArray(Document document, boolean compress) {
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378 if (document != null) {
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parents: 202
diff changeset
379 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
380 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
381 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
382 ? 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
383 : 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
384 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
385 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
386 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
387 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
388 ? 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
389 : 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
390 }
23d642319a0b Added a boolean flag to XML byte serialisation to compress/decompress, too.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 202
diff changeset
391 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
392 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
393 }
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
394 }
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
395 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
396 }
147
9a64e0c1c737 Added code to load user from database.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 135
diff changeset
397
9a64e0c1c737 Added code to load user from database.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 135
diff changeset
398 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
399 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
400 }
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
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 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
403 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
404 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
405 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
406 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
407 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
408 }
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 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
410 }
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 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
412 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
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 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
415 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
416 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
417 }
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 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
419 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
420 }
23d642319a0b Added a boolean flag to XML byte serialisation to compress/decompress, too.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 202
diff changeset
421 }
147
9a64e0c1c737 Added code to load user from database.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 135
diff changeset
422 }
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
423 return null;
147
9a64e0c1c737 Added code to load user from database.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 135
diff changeset
424 }
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
425 }
4122dbc9711b Added a new package artifacts-common for classes and utilities used in several packages.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
diff changeset
426 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org