Mercurial > mxd2map
annotate src/java/de/intevation/mxd/utils/XMLUtils.java @ 247:30e10eb9ac68
Print out a message if an empty layer is not written to the mapfile.
author | raimund renkert <raimund.renkert@intevation.de> |
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date | Wed, 10 Aug 2011 13:23:29 +0200 |
parents | df4e0946ef02 |
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rev | line source |
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1 /* |
243 | 2 * Copyright (c) 2011 by Intevation GmbH, Germany <info@intevation.de> |
3 * | |
4 * This file is part of MXD2map. | |
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5 * |
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6 * This program is free software under the LGPL (>=v2.1) |
243 | 7 * Read the file LICENCE.txt coming with the software for details |
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8 * or visit http://www.gnu.org/licenses/ if it does not exist. |
243 | 9 * |
10 * MXD2map has been developed on behalf of the | |
11 * Bundesamt fuer Seeschifffahrt und Hydrographie (BSH) in Hamburg | |
12 * by Intevation GmbH. | |
13 * | |
14 * Authors: | |
15 * Raimund Renkert <raimund.renkert@intevation.de> | |
16 * Bjoern Schilberg <bjoern.schilberg@intevation.de> | |
17 * Stephan Holl <stephan.holl@intevation.de> | |
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18 */ |
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19 |
33
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20 package de.intevation.mxd.utils; |
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21 |
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22 import java.io.ByteArrayInputStream; |
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23 import java.io.FileInputStream; |
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24 import java.io.BufferedInputStream; |
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25 import java.io.ByteArrayOutputStream; |
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26 import java.io.File; |
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27 import java.io.IOException; |
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28 import java.io.InputStream; |
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29 import java.io.OutputStream; |
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30 |
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31 import javax.xml.namespace.NamespaceContext; |
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32 import javax.xml.namespace.QName; |
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33 |
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34 import javax.xml.parsers.DocumentBuilderFactory; |
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35 import javax.xml.parsers.ParserConfigurationException; |
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36 |
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37 import javax.xml.transform.Transformer; |
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38 import javax.xml.transform.TransformerConfigurationException; |
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39 import javax.xml.transform.TransformerException; |
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40 import javax.xml.transform.TransformerFactory; |
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41 import javax.xml.transform.TransformerFactoryConfigurationError; |
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42 |
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43 import javax.xml.transform.dom.DOMSource; |
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44 |
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45 import javax.xml.transform.stream.StreamResult; |
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46 |
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47 import javax.xml.xpath.XPath; |
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48 import javax.xml.xpath.XPathConstants; |
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49 import javax.xml.xpath.XPathExpressionException; |
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50 import javax.xml.xpath.XPathFactory; |
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51 |
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52 import org.apache.log4j.Logger; |
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53 |
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54 import org.w3c.dom.Attr; |
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55 import org.w3c.dom.Document; |
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56 import org.w3c.dom.Element; |
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57 |
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58 import org.xml.sax.SAXException; |
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59 |
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60 /** |
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61 * Some helper functions to ease work with XML concering namespaces, XPATH |
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62 * and so on. |
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63 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a> |
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64 */ |
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65 public final class XMLUtils |
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66 { |
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67 /** |
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68 * W3C URL of XForms |
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69 */ |
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70 public static final String XFORM_URL = "http://www.w3.org/2002/xforms"; |
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71 /** |
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72 * W3C prefix of XForms |
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73 */ |
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74 public static final String XFORM_PREFIX = "xform"; |
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75 |
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76 private static Logger logger = Logger.getLogger(XMLUtils.class); |
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77 |
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78 private XMLUtils() { |
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79 } |
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80 |
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81 /** |
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82 * Helper class to generate elements and attributes with |
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83 * namespaces. |
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84 */ |
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85 public static class ElementCreator |
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86 { |
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87 /** |
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88 * owner document of the elements to be created |
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89 */ |
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90 protected Document document; |
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91 /** |
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92 * namespace to be used |
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93 */ |
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94 protected String ns; |
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95 /** |
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96 * prefix to be used |
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97 */ |
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98 protected String prefix; |
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99 |
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100 /** |
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101 * Constructor to create an element/attribute creator |
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102 * with a given namespace and namespace prefix using a |
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103 * given owner document. |
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104 * @param document The owning document |
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105 * @param ns The namespace |
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106 * @param prefix The namespace prefix |
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107 */ |
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108 public ElementCreator(Document document, String ns, String prefix) { |
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109 this.document = document; |
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110 this.ns = ns; |
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111 this.prefix = prefix; |
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112 } |
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113 |
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114 /** |
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115 * Creates a new element using the owning document with |
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116 * the this creators namespace and namespace prefix. |
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117 * @param name The name of the element |
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118 * @return The new element |
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119 */ |
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120 public Element create(String name) { |
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121 Element element = document.createElementNS(ns, name); |
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122 element.setPrefix(prefix); |
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123 return element; |
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124 } |
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125 |
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126 /** |
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127 * Adds a new attribute and its value to a given element. |
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128 * It does not set the namespace prefix. |
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129 * @param element The element to add the attribute to |
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130 * @param name The name of the attribute |
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131 * @param value The value of the attribute |
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132 */ |
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133 public void addAttr(Element element, String name, String value) { |
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134 addAttr(element, name, value, false); |
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135 } |
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136 |
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137 /** |
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138 * Adds a new attribute and its value to a given element. |
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139 * If the namespace prefix is used is decided by the 'addPrefix' flag. |
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140 * @param element The element to add the attribute to |
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141 * @param name The name of the attribute |
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142 * @param value The value of the attribute |
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143 * @param addPrefix If true the creators namespace prefix is |
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144 * set on the attribute. |
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145 */ |
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146 public void addAttr( |
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147 Element element, |
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148 String name, |
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149 String value, |
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150 boolean addPrefix |
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151 ) { |
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152 if (addPrefix) { |
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153 Attr attr = document.createAttributeNS(ns, name); |
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154 attr.setValue(value); |
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155 attr.setPrefix(prefix); |
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156 |
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157 element.setAttributeNode(attr); |
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158 } |
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159 else { |
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160 element.setAttribute(name, value); |
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161 } |
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162 |
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163 } |
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164 } // class ElementCreator |
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165 |
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166 /** |
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167 * Creates a new XML document |
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168 * @return the new XML document ot null if something went wrong during |
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169 * creation. |
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170 */ |
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171 public static final Document newDocument() { |
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172 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); |
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173 factory.setNamespaceAware(true); |
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174 |
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175 try { |
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176 return factory.newDocumentBuilder().newDocument(); |
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177 } |
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178 catch (ParserConfigurationException pce) { |
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179 logger.error(pce.getLocalizedMessage(), pce); |
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180 } |
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181 return null; |
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182 } |
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183 |
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184 /** |
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185 * Loads a XML document namespace aware from a file |
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186 * @param file The file to load. |
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187 * @return the XML document or null if something went wrong |
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188 * during loading. |
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189 */ |
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190 public static final Document parseDocument(File file) { |
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191 InputStream inputStream = null; |
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192 try { |
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193 inputStream = new BufferedInputStream(new FileInputStream(file)); |
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194 return parseDocument(inputStream); |
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195 } |
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196 catch (IOException ioe) { |
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197 logger.error(ioe.getLocalizedMessage(), ioe); |
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198 } |
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199 finally { |
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200 if (inputStream != null) { |
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201 try { inputStream.close(); } |
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202 catch (IOException ioe) {} |
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203 } |
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204 } |
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205 return null; |
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206 } |
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207 |
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208 public static final Document parseDocument(InputStream inputStream) { |
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209 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); |
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210 factory.setNamespaceAware(true); |
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211 |
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212 try { |
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213 return factory.newDocumentBuilder().parse(inputStream); |
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214 } |
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215 catch (ParserConfigurationException pce) { |
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216 logger.error(pce.getLocalizedMessage(), pce); |
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217 } |
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218 catch (SAXException se) { |
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219 logger.error(se.getLocalizedMessage(), se); |
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220 } |
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221 catch (IOException ioe) { |
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222 logger.error(ioe.getLocalizedMessage(), ioe); |
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223 } |
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224 return null; |
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225 } |
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226 |
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227 /** |
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228 * Creates a new XPath without a namespace context. |
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229 * @return the new XPath. |
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230 */ |
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231 public static final XPath newXPath() { |
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232 return newXPath(null); |
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233 } |
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234 |
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235 /** |
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236 * Creates a new XPath with a given namespace context. |
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237 * @param namespaceContext The namespace context to be used or null |
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238 * if none should be used. |
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239 * @return The new XPath |
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240 */ |
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241 public static final XPath newXPath(NamespaceContext namespaceContext) { |
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242 XPathFactory factory = XPathFactory.newInstance(); |
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243 XPath xpath = factory.newXPath(); |
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244 if (namespaceContext != null) { |
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245 xpath.setNamespaceContext(namespaceContext); |
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246 } |
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247 return xpath; |
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248 } |
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249 |
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250 /** |
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251 * Evaluates an XPath query on a given object and returns the result |
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252 * as a given type. No namespace context is used. |
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253 * @param root The object which is used as the root of the tree to |
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254 * be searched in. |
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255 * @param query The XPath query |
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256 * @param returnTyp The type of the result. |
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257 * @return The result of type 'returnTyp' or null if something |
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258 * went wrong during XPath evaluation. |
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259 */ |
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260 public static final Object xpath( |
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261 Object root, |
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262 String query, |
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263 QName returnTyp |
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264 ) { |
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265 return xpath(root, query, returnTyp, null); |
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266 } |
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267 |
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268 /** |
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269 * Evaluates an XPath query on a given object and returns the result |
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270 * as a string. A given namespace context is used. |
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271 * @param root The object which is used as the root of the tree to |
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272 * be searched in. |
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273 * @param query The XPath query |
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274 * @param namespaceContext The namespace context to be used or null |
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275 * if none should be used. |
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276 * @return The result of the query or null if something went wrong |
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277 * during XPath evaluation. |
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278 */ |
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279 public static final String xpathString( |
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280 Object root, String query, NamespaceContext namespaceContext |
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281 ) { |
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282 return (String)xpath( |
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283 root, query, XPathConstants.STRING, namespaceContext); |
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284 } |
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285 |
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286 /** |
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287 * Evaluates an XPath query on a given object and returns the result |
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288 * as a given type. Optionally a namespace context is used. |
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289 * @param root The object which is used as the root of the tree to |
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290 * be searched in. |
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291 * @param query The XPath query |
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292 * @param returnType The type of the result. |
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293 * @param namespaceContext The namespace context to be used or null |
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294 * if none should be used. |
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295 * @return The result of type 'returnTyp' or null if something |
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296 * went wrong during XPath evaluation. |
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297 */ |
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298 public static final Object xpath( |
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299 Object root, |
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300 String query, |
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301 QName returnType, |
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302 NamespaceContext namespaceContext |
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303 ) { |
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304 if (root == null) { |
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305 return null; |
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306 } |
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307 |
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308 try { |
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309 XPath xpath = newXPath(namespaceContext); |
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310 if (xpath != null) { |
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311 return xpath.evaluate(query, root, returnType); |
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312 } |
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313 } |
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314 catch (XPathExpressionException xpee) { |
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315 logger.error(xpee.getLocalizedMessage(), xpee); |
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316 } |
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317 |
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318 return null; |
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319 } |
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320 |
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321 /** |
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322 * Streams out an XML document to a given output stream. |
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323 * @param document The document to be streamed out. |
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324 * @param out The output stream to be used. |
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325 * @return true if operation succeeded else false. |
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326 */ |
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327 public static boolean toStream(Document document, OutputStream out) { |
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328 try { |
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329 Transformer transformer = |
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330 TransformerFactory.newInstance().newTransformer(); |
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331 DOMSource source = new DOMSource(document); |
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332 StreamResult result = new StreamResult(out); |
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333 transformer.transform(source, result); |
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334 return true; |
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335 } |
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336 catch (TransformerConfigurationException tce) { |
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337 logger.error(tce.getLocalizedMessage(), tce); |
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338 } |
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339 catch (TransformerFactoryConfigurationError tfce) { |
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340 logger.error(tfce.getLocalizedMessage(), tfce); |
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341 } |
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342 catch (TransformerException te) { |
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343 logger.error(te.getLocalizedMessage(), te); |
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344 } |
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345 |
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346 return false; |
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347 } |
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348 |
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349 /** |
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350 * Transforms an XML document into a byte array. |
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351 * @param document The document to be streamed out. |
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352 * @return the byte array or null if operation failed or |
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353 * document is null. |
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354 */ |
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355 public static byte [] toByteArray(Document document) { |
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356 if (document == null) { |
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357 return null; |
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358 } |
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359 ByteArrayOutputStream baos = new ByteArrayOutputStream(); |
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360 return toStream(document, baos) |
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361 ? baos.toByteArray() |
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362 : null; |
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363 } |
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364 |
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365 public static Document fromByteArray(byte [] data) { |
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366 if (data == null) { |
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367 return null; |
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368 } |
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369 return parseDocument(new ByteArrayInputStream(data)); |
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370 } |
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371 } |
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372 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |