Mercurial > dive4elements > framework
comparison artifacts-common/src/main/java/de/intevation/artifacts/common/utils/XMLUtils.java @ 323:1d3607ceb9fa
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 |
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| 322:93a774fe2bb4 | 323:1d3607ceb9fa |
|---|---|
| 6 * or visit http://www.gnu.org/licenses/ if it does not exist. | 6 * or visit http://www.gnu.org/licenses/ if it does not exist. |
| 7 */ | 7 */ |
| 8 | 8 |
| 9 package de.intevation.artifacts.common.utils; | 9 package de.intevation.artifacts.common.utils; |
| 10 | 10 |
| 11 import java.util.Map; | |
| 11 import java.util.zip.GZIPInputStream; | 12 import java.util.zip.GZIPInputStream; |
| 12 import java.util.zip.GZIPOutputStream; | 13 import java.util.zip.GZIPOutputStream; |
| 13 | 14 |
| 14 import java.io.ByteArrayInputStream; | 15 import java.io.ByteArrayInputStream; |
| 15 import java.io.FileInputStream; | 16 import java.io.FileInputStream; |
| 39 | 40 |
| 40 import javax.xml.xpath.XPath; | 41 import javax.xml.xpath.XPath; |
| 41 import javax.xml.xpath.XPathConstants; | 42 import javax.xml.xpath.XPathConstants; |
| 42 import javax.xml.xpath.XPathExpressionException; | 43 import javax.xml.xpath.XPathExpressionException; |
| 43 import javax.xml.xpath.XPathFactory; | 44 import javax.xml.xpath.XPathFactory; |
| 45 import javax.xml.xpath.XPathVariableResolver; | |
| 44 | 46 |
| 45 import org.apache.log4j.Logger; | 47 import org.apache.log4j.Logger; |
| 46 | 48 |
| 47 import org.w3c.dom.Attr; | 49 import org.w3c.dom.Attr; |
| 48 import org.w3c.dom.Document; | 50 import org.w3c.dom.Document; |
| 220 /** | 222 /** |
| 221 * Creates a new XPath without a namespace context. | 223 * Creates a new XPath without a namespace context. |
| 222 * @return the new XPath. | 224 * @return the new XPath. |
| 223 */ | 225 */ |
| 224 public static final XPath newXPath() { | 226 public static final XPath newXPath() { |
| 225 return newXPath(null); | 227 return newXPath(null, null); |
| 226 } | 228 } |
| 227 | 229 |
| 228 /** | 230 /** |
| 229 * Creates a new XPath with a given namespace context. | 231 * Creates a new XPath with a given namespace context. |
| 230 * @param namespaceContext The namespace context to be used or null | 232 * @param namespaceContext The namespace context to be used or null |
| 231 * if none should be used. | 233 * if none should be used. |
| 232 * @return The new XPath | 234 * @return The new XPath |
| 233 */ | 235 */ |
| 234 public static final XPath newXPath(NamespaceContext namespaceContext) { | 236 public static final XPath newXPath( |
| 237 NamespaceContext namespaceContext, | |
| 238 XPathVariableResolver resolver) | |
| 239 { | |
| 235 XPathFactory factory = XPathFactory.newInstance(); | 240 XPathFactory factory = XPathFactory.newInstance(); |
| 236 XPath xpath = factory.newXPath(); | 241 XPath xpath = factory.newXPath(); |
| 237 if (namespaceContext != null) { | 242 if (namespaceContext != null) { |
| 238 xpath.setNamespaceContext(namespaceContext); | 243 xpath.setNamespaceContext(namespaceContext); |
| 244 } | |
| 245 | |
| 246 if (resolver != null) { | |
| 247 xpath.setXPathVariableResolver(resolver); | |
| 239 } | 248 } |
| 240 return xpath; | 249 return xpath; |
| 241 } | 250 } |
| 242 | 251 |
| 243 /** | 252 /** |
| 292 Object root, | 301 Object root, |
| 293 String query, | 302 String query, |
| 294 QName returnType, | 303 QName returnType, |
| 295 NamespaceContext namespaceContext | 304 NamespaceContext namespaceContext |
| 296 ) { | 305 ) { |
| 306 return xpath(root, query, returnType, namespaceContext, null); | |
| 307 } | |
| 308 | |
| 309 public static final Object xpath( | |
| 310 Object root, | |
| 311 String query, | |
| 312 QName returnType, | |
| 313 NamespaceContext namespaceContext, | |
| 314 Map<String, String> variables) | |
| 315 { | |
| 297 if (root == null) { | 316 if (root == null) { |
| 298 return null; | 317 return null; |
| 299 } | 318 } |
| 300 | 319 |
| 301 try { | 320 XPathVariableResolver resolver = variables != null |
| 302 XPath xpath = newXPath(namespaceContext); | 321 ? new MapXPathVariableResolver(variables) |
| 322 : null; | |
| 323 | |
| 324 try { | |
| 325 XPath xpath = newXPath(namespaceContext, resolver); | |
| 303 if (xpath != null) { | 326 if (xpath != null) { |
| 304 return xpath.evaluate(query, root, returnType); | 327 return xpath.evaluate(query, root, returnType); |
| 305 } | 328 } |
| 306 } | 329 } |
| 307 catch (XPathExpressionException xpee) { | 330 catch (XPathExpressionException xpee) { |