vgritsenko 2003/08/06 14:44:37
Modified: xmlutil build.xml default.properties
Added: xmlutil/src/java/org/apache/excalibur/xml/xpath
Saxon6ProcessorImpl.java Saxon7ProcessorImpl.java
Log:
Add xpath processors based on the Saxon 6.x and 7.x xslt processors
Revision Changes Path
1.49 +37 -31 avalon-excalibur/xmlutil/build.xml
Index: build.xml
===================================================================
RCS file: /home/cvs/avalon-excalibur/xmlutil/build.xml,v
retrieving revision 1.48
retrieving revision 1.49
diff -u -r1.48 -r1.49
--- build.xml 30 Jul 2003 19:33:42 -0000 1.48
+++ build.xml 6 Aug 2003 21:44:36 -0000 1.49
@@ -30,6 +30,8 @@
<pathelement location="${saxpath.jar}"/>
<pathelement location="${xml-apis.jar}"/>
<pathelement location="${jaxen.jar}"/>
+ <pathelement location="${saxon6.jar}"/>
+ <pathelement location="${saxon7.jar}"/>
<pathelement location="${resolver.jar}"/>
<pathelement location="${jtidy.jar}"/>
<pathelement path="${java.class.path}"/>
@@ -55,7 +57,15 @@
<!-- Checks the environment for existing resources -->
<target name="check-environment">
- <available property="jaxen.present" classname="org.jaxen.dom.DOMXPath"/>
+ <available property="jaxen.present" classname="org.jaxen.dom.DOMXPath">
+ <classpath refid="project.class.path"/>
+ </available>
+ <available property="saxon6.present"
classname="com.icl.saxon.expr.Expression">
+ <classpath refid="project.class.path"/>
+ </available>
+ <available property="saxon7.present"
classname="net.sf.saxon.xpath.XPathEvaluator">
+ <classpath refid="project.class.path"/>
+ </available>
</target>
<target name="dependencies" description="Check dependencies"
unless="skip.dependencies">
@@ -96,22 +106,23 @@
<!-- Compiles the source code -->
<target name="compile" depends="dependencies, check-environment"
description="Compiles the source code">
-
<mkdir dir="${build.classes}"/>
<!-- Compile all classes excluding the tests. -->
<javac srcdir="${java.dir}"
- destdir="${build.classes}"
- debug="${build.debug}"
- optimize="${build.optimize}"
- deprecation="${build.deprecation}"
- target="1.2">
+ destdir="${build.classes}"
+ debug="${build.debug}"
+ optimize="${build.optimize}"
+ deprecation="${build.deprecation}"
+ target="1.2">
<classpath refid="project.class.path" />
<exclude name="**/Jaxen*" unless="jaxen.present"/>
+ <exclude name="**/Saxon6*" unless="saxon6.present"/>
+ <exclude name="**/Saxon7*" unless="saxon7.present"/>
<exclude name="**/test/**"/>
</javac>
- <!-- generate fortress meta descriptors
+ <!-- Generate fortress meta descriptors
<taskdef name="fortress-collect-meta"
classname="org.apache.avalon.fortress.tools.ComponentMetaInfoCollector">
<classpath refid="project.class.path"/>
@@ -119,10 +130,8 @@
<fortress-collect-meta destdir="${build.classes}">
<fileset dir="${java.dir}"/>
- </fortress-collect-meta>
-
- Remove for the time being.
- -->
+ </fortress-collect-meta>
+ Remove for the time being. -->
<!-- copy resources to same location as .class files -->
<copy todir="${build.classes}">
@@ -131,7 +140,6 @@
<exclude name="**/package.html"/>
</fileset>
</copy>
-
</target>
<!-- Compiles the unit test source code -->
@@ -140,18 +148,22 @@
<!-- Copy over all of the tests applying test filters -->
<copy todir="${build.testsrc}">
- <fileset dir="${test.dir}"/>
+ <fileset dir="${test.dir}">
+ <exclude name="**/Jaxen*" unless="jaxen.present"/>
+ <exclude name="**/Saxon6*" unless="saxon6.present"/>
+ <exclude name="**/Saxon7*" unless="saxon7.present"/>
+ </fileset>
</copy>
<mkdir dir="${build.testclasses}"/>
<!-- Compile all test classes. -->
<javac srcdir="${build.testsrc}"
- destdir="${build.testclasses}"
- debug="${build.debug}"
- optimize="${build.optimize}"
- deprecation="${build.deprecation}"
- target="1.2">
+ destdir="${build.testclasses}"
+ debug="${build.debug}"
+ optimize="${build.optimize}"
+ deprecation="${build.deprecation}"
+ target="1.2">
<classpath refid="test.class.path" />
<include name="**/*.java"/>
</javac>
@@ -160,9 +172,11 @@
<fileset dir="${test.dir}">
<exclude name="**/*.java"/>
<exclude name="**/package.html"/>
+ <exclude name="**/Jaxen*" unless="jaxen.present"/>
+ <exclude name="**/Saxon6*" unless="saxon6.present"/>
+ <exclude name="**/Saxon7*" unless="saxon7.present"/>
</fileset>
</copy>
-
</target>
<!-- Copies and filters the license. Used by jar and dist -->
@@ -178,7 +192,6 @@
<!-- Creates all the .jar file -->
<target name="jar" depends="compile, prepare-conf" description="Generates the
jar files">
-
<mkdir dir="${build.lib}"/>
<jar jarfile="${build.lib}/${jar.name}"
@@ -226,15 +239,14 @@
</target>
<target name="test" depends="compile-test" description="Perform the unit tests"
unless="skip.tests">
-
<echo message="Performing Unit Tests" />
<mkdir dir="${build.tests}"/>
<junit fork="true"
- haltonfailure="${junit.failonerror}"
- printsummary="yes"
- dir="${build.tests}">
+ haltonfailure="${junit.failonerror}"
+ printsummary="yes"
+ dir="${build.tests}">
<classpath refid="test.class.path"/>
<formatter type="xml"/> <!-- xml reports for junitreport -->
@@ -247,11 +259,9 @@
</fileset>
</batchtest>
</junit>
-
</target>
<target name="test-reports" depends="test" description="Generate Reports for
the unit tests">
-
<ant antfile="${depchecker.prefix}/depchecker.xml" target="checkBSF"/>
<mkdir dir="${build.reports}/junit"/>
@@ -270,7 +280,6 @@
<fileset dir="${build.tests}" includes="TESTS-*.xml"/>
</delete>
-->
-
</target>
<target name="checkstyle" if="do.checkstyle" description="Checkstyle">
@@ -321,7 +330,6 @@
out="${build.reports}/checkstyle/delete-me.html">
<param name="pathhack" expression="${checkstyle.pathhack}"/>
</style>
-
</target>
<!-- Creates the distribution -->
@@ -329,7 +337,6 @@
depends="dist-jar, test-reports, checkstyle-report, javadocs, docs"
description="Generates a distribution (jar + javadocs + unit tests +
checkstyle reports)">
-
<copy file="${build.conf}/LICENSE.txt" todir="${dist.dir}"/>
<zip zipfile="${dist.dir}/src.zip" compress="false">
@@ -363,7 +370,6 @@
description="Generates a minimal distribution (jar + javadocs)">
<copy file="../LICENSE.txt" todir="${dist.dir}"/>
-
</target>
<!-- Setup the filters -->
1.32 +2 -0 avalon-excalibur/xmlutil/default.properties
Index: default.properties
===================================================================
RCS file: /home/cvs/avalon-excalibur/xmlutil/default.properties,v
retrieving revision 1.31
retrieving revision 1.32
diff -u -r1.31 -r1.32
--- default.properties 2 Jun 2003 14:12:01 -0000 1.31
+++ default.properties 6 Aug 2003 21:44:36 -0000 1.32
@@ -97,6 +97,8 @@
saxpath.jar = ${lib.dir}/saxpath.jar
jaxen.jar = ${lib.dir}/jaxen-full.jar
+saxon6.jar = ${lib.dir}/saxon-6.5.2.jar
+saxon7.jar = ${lib.dir}/saxon-7.5.jar
resolver.jar = ${lib.dir}/resolver-20021114.jar
jtidy.jar = ${lib.dir}/jtidy-04aug2000r7-dev.jar
1.1
avalon-excalibur/xmlutil/src/java/org/apache/excalibur/xml/xpath/Saxon6ProcessorImpl.java
Index: Saxon6ProcessorImpl.java
===================================================================
/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2002 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software
* itself, if and wherever such third-party acknowledgments
* normally appear.
*
* 4. The names "Jakarta", "Avalon", and "Apache Software Foundation"
* must not be used to endorse or promote products derived from this
* software without prior written permission. For written
* permission, please contact [EMAIL PROTECTED]
*
* 5. Products derived from this software may not be called "Apache",
* nor may "Apache" appear in their name, without prior written
* permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*/
package org.apache.excalibur.xml.xpath;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.TransformerFactory;
import org.apache.avalon.framework.component.Component;
import org.apache.avalon.framework.thread.ThreadSafe;
import com.icl.saxon.Context;
import com.icl.saxon.TransformerFactoryImpl;
import com.icl.saxon.tinytree.TinyBuilder;
import com.icl.saxon.expr.Expression;
import com.icl.saxon.expr.StandaloneContext;
import com.icl.saxon.expr.Value;
import com.icl.saxon.expr.XPathException;
import com.icl.saxon.expr.NodeSetValue;
import com.icl.saxon.om.DocumentInfo;
import com.icl.saxon.om.NamePool;
import com.icl.saxon.om.NodeInfo;
import com.icl.saxon.om.NodeEnumeration;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
/**
* This class defines the implementation of the [EMAIL PROTECTED] XPathProcessor}
* component. This implementation depends on Saxon 6.X XSLT processor.
* This implementation was tested with Saxon 6.5.2 release.
*
* To configure it, add the following lines in the
* <file>cocoon.xconf</file> file:
*
* <pre>
* <xpath-processor
class="org.apache.cocoon.components.xpath.Saxon6ProcessorImpl">
* </xpath-processor>
* </pre>
*
* @author <a href="mailto:[EMAIL PROTECTED]">Vadim Gritsenko</a>
* @version CVS $Revision: 1.1 $ $Date: 2003/08/06 21:44:37 $ $Author: vgritsenko $
*/
public class Saxon6ProcessorImpl
extends AbstractProcessorImpl
implements XPathProcessor, Component, ThreadSafe
{
private static final TransformerFactory factory = new TransformerFactoryImpl();
/**
* Evaluate XPath expression within a context.
*
* @param contextNode The context node.
* @param str A valid XPath string.
* @param resolver a PrefixResolver, used for resolving namespace prefixes
* @return expression result as boolean.
*/
public boolean evaluateAsBoolean(Node contextNode, String str, PrefixResolver
resolver)
{
try
{
Value value = evaluate(contextNode, str, resolver);
if (value == null)
{
return false;
}
return value.asBoolean();
}
catch (final Exception e)
{
if (getLogger().isDebugEnabled()) {
getLogger().debug("Failed to evaluate '" + str + "'", e);
}
// ignore it
return false;
}
}
/**
* Evaluate XPath expression within a context.
*
* @param contextNode The context node.
* @param str A valid XPath string.
* @param resolver a PrefixResolver, used for resolving namespace prefixes
* @return expression result as number.
*/
public Number evaluateAsNumber(Node contextNode, String str, PrefixResolver
resolver)
{
try
{
Value value = evaluate(contextNode, str, resolver);
if (value == null)
{
return null;
}
return new Double(value.asNumber());
}
catch (final Exception e)
{
if (getLogger().isDebugEnabled()) {
getLogger().debug("Failed to evaluate '" + str + "'", e);
}
// ignore it
return null;
}
}
/**
* Evaluate XPath expression within a context.
*
* @param contextNode The context node.
* @param str A valid XPath string.
* @param resolver a PrefixResolver, used for resolving namespace prefixes
* @return expression result as string.
*/
public String evaluateAsString(Node contextNode, String str, PrefixResolver
resolver) {
try
{
Value value = evaluate(contextNode, str, resolver);
if (value == null)
{
return null;
}
return value.asString();
}
catch (final Exception e)
{
if (getLogger().isDebugEnabled()) {
getLogger().debug("Failed to evaluate '" + str + "'", e);
}
// ignore it
return null;
}
}
public Node selectSingleNode(Node contextNode, String str, PrefixResolver
resolver)
{
try
{
Value value = evaluate(contextNode, str, resolver);
if (value == null || value.getDataType() != Value.NODESET)
{
return null;
}
return (Node)((NodeSetValue)value).getFirst();
}
catch (final Exception e)
{
if (getLogger().isDebugEnabled()) {
getLogger().debug("Failed to evaluate '" + str + "'", e);
}
// ignore it
return null;
}
}
public NodeList selectNodeList(Node contextNode, String str, PrefixResolver
resolver)
{
try
{
Value value = evaluate(contextNode, str, resolver);
if (value.getDataType() != Value.NODESET)
{
return null;
}
NodeSetValue nodeset = (NodeSetValue)value;
NodeEnumeration enumeration = nodeset.enumerate();
Node[] nodes = new Node[nodeset.getCount()];
for (int i = 0; i < nodes.length; i++)
{
nodes[i] = (Node)enumeration.nextElement();
}
return new NodeListImpl(nodes);
} catch (final Exception e) {
if (getLogger().isDebugEnabled()) {
getLogger().debug("Failed to evaluate '" + str + "'", e);
}
// ignore it
return null;
}
}
private Value evaluate(Node contextNode, String str, PrefixResolver resolver)
{
try
{
if (!(contextNode instanceof NodeInfo))
{
getLogger().debug("Input tree is not SAXON TinyTree, converting");
DOMSource source = new DOMSource(contextNode);
TinyBuilder result = new TinyBuilder();
factory.newTransformer().transform(source, result);
contextNode = (Node)result.getCurrentDocument();
}
DocumentInfo doc = ((NodeInfo)contextNode).getDocumentRoot();
NamePool pool = doc.getNamePool();
if (pool == null)
{
pool = NamePool.getDefaultNamePool();
doc.setNamePool(pool);
}
Expression expression = Expression.make(str, new Saxon6Context(pool,
resolver));
Context context = new Context();
context.setContextNode((NodeInfo)contextNode);
context.setPosition(1);
context.setLast(1);
return expression.evaluate(context);
}
catch (final Exception e)
{
if (getLogger().isDebugEnabled()) {
getLogger().debug("Failed to evaluate '" + str + "'", e);
}
// ignore it
return null;
}
}
private class Saxon6Context extends StandaloneContext
{
private final PrefixResolver resolver;
public Saxon6Context(NamePool namePool, PrefixResolver resolver)
{
super(namePool);
this.resolver = resolver;
}
public String getURIForPrefix(String prefix) throws XPathException
{
return resolver.prefixToNamespace(prefix);
}
}
}
1.1
avalon-excalibur/xmlutil/src/java/org/apache/excalibur/xml/xpath/Saxon7ProcessorImpl.java
Index: Saxon7ProcessorImpl.java
===================================================================
/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2002 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software
* itself, if and wherever such third-party acknowledgments
* normally appear.
*
* 4. The names "Jakarta", "Avalon", and "Apache Software Foundation"
* must not be used to endorse or promote products derived from this
* software without prior written permission. For written
* permission, please contact [EMAIL PROTECTED]
*
* 5. Products derived from this software may not be called "Apache",
* nor may "Apache" appear in their name, without prior written
* permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*/
package org.apache.excalibur.xml.xpath;
import org.apache.avalon.framework.thread.ThreadSafe;
import org.apache.avalon.framework.component.Component;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import net.sf.saxon.om.NodeInfo;
import net.sf.saxon.om.SequenceIterator;
import net.sf.saxon.om.Item;
import net.sf.saxon.xpath.XPathException;
import net.sf.saxon.xpath.StandaloneContext;
import net.sf.saxon.TransformerFactoryImpl;
import net.sf.saxon.expr.Expression;
import net.sf.saxon.expr.XPathContext;
import net.sf.saxon.tinytree.TinyBuilder;
import net.sf.saxon.value.Type;
import net.sf.saxon.value.BooleanValue;
import net.sf.saxon.value.DoubleValue;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import java.util.ArrayList;
/**
* This class defines the implementation of the [EMAIL PROTECTED] XPathProcessor}
* component. This implementation depends on Saxon 7.X XSLT processor.
* This implementation was tested with Saxon 7.5 release.
*
* To configure it, add the following lines in the
* <file>cocoon.xconf</file> file:
*
* <pre>
* <xslt-processor
class="org.apache.cocoon.components.xpath.Saxon7ProcessorImpl">
* </xslt-processor>
* </pre>
*
* @author <a href="mailto:[EMAIL PROTECTED]">Vadim Gritsenko</a>
* @version CVS $Id: Saxon7ProcessorImpl.java,v 1.1 2003/08/06 21:44:37 vgritsenko
Exp $
*/
public class Saxon7ProcessorImpl
extends AbstractProcessorImpl
implements XPathProcessor, Component, ThreadSafe
{
private static final TransformerFactory factory = new TransformerFactoryImpl();
/**
* Evaluate XPath expression within a context.
*
* @param contextNode The context node.
* @param str A valid XPath string.
* @param resolver a PrefixResolver, used for resolving namespace prefixes
* @return expression result as boolean.
*/
public boolean evaluateAsBoolean(Node contextNode, String str, PrefixResolver
resolver)
{
try
{
Item item = evaluateSingle(contextNode, str, resolver);
if (item == null)
{
return false;
}
if (item.getItemType() == Type.BOOLEAN)
{
return ((BooleanValue)item).getValue();
}
return Boolean.valueOf(item.getStringValue()).booleanValue();
}
catch (final Exception e)
{
if (getLogger().isDebugEnabled()) {
getLogger().debug("Failed to evaluate '" + str + "'", e);
}
// ignore it
return false;
}
}
/**
* Evaluate XPath expression within a context.
*
* @param contextNode The context node.
* @param str A valid XPath string.
* @param resolver a PrefixResolver, used for resolving namespace prefixes
* @return expression result as number.
*/
public Number evaluateAsNumber(Node contextNode, String str, PrefixResolver
resolver)
{
try
{
Item item = evaluateSingle(contextNode, str, resolver);
if (item == null)
{
return null;
}
if (item.getItemType() == Type.NUMBER)
{
return new Double(((DoubleValue)item).getValue());
}
return Double.valueOf(item.getStringValue());
}
catch (final Exception e)
{
if (getLogger().isDebugEnabled()) {
getLogger().debug("Failed to evaluate '" + str + "'", e);
}
// ignore it
return null;
}
}
/**
* Evaluate XPath expression within a context.
*
* @param contextNode The context node.
* @param str A valid XPath string.
* @param resolver a PrefixResolver, used for resolving namespace prefixes
* @return expression result as string.
*/
public String evaluateAsString(Node contextNode, String str, PrefixResolver
resolver) {
try
{
Item item = evaluateSingle(contextNode, str, resolver);
if (item == null)
{
return null;
}
return item.getStringValue();
}
catch (final Exception e)
{
if (getLogger().isDebugEnabled()) {
getLogger().debug("Failed to evaluate '" + str + "'", e);
}
// ignore it
return null;
}
}
public Node selectSingleNode(Node contextNode, String str, PrefixResolver
resolver)
{
try
{
Item item = evaluateSingle(contextNode, str, resolver);
return (Node)item;
}
catch (final Exception e)
{
if (getLogger().isDebugEnabled()) {
getLogger().debug("Failed to evaluate '" + str + "'", e);
}
// ignore it
return null;
}
}
public NodeList selectNodeList(Node contextNode, String str, PrefixResolver
resolver)
{
try
{
SequenceIterator iterator = evaluate(contextNode, str, resolver);
ArrayList nodes = new ArrayList();
while (iterator.hasNext())
{
Node node = (Node)iterator.current();
nodes.add(node);
}
return new NodeListImpl((Node[])nodes.toArray());
} catch (final Exception e) {
if (getLogger().isDebugEnabled()) {
getLogger().debug("Failed to evaluate '" + str + "'", e);
}
// ignore it
return null;
}
}
private Item evaluateSingle(Node contextNode, String str, PrefixResolver
resolver)
{
try
{
SequenceIterator iterator = evaluate(contextNode, str, resolver);
if (iterator == null)
{
return null;
}
return iterator.current();
}
catch (final Exception e)
{
if (getLogger().isDebugEnabled()) {
getLogger().debug("Failed to evaluate '" + str + "'", e);
}
// ignore it
return null;
}
}
private SequenceIterator evaluate(Node contextNode, String str, PrefixResolver
resolver)
{
try
{
if (!(contextNode instanceof NodeInfo))
{
getLogger().debug("Input tree is not SAXON TinyTree, converting");
DOMSource source = new DOMSource(contextNode);
TinyBuilder result = new TinyBuilder();
factory.newTransformer().transform(source, result);
contextNode = (Node)result.getCurrentDocument();
}
Expression expression = Expression.make(str, new
Saxon7Context((NodeInfo)contextNode, resolver));
XPathContext context = new XPathContext((NodeInfo)contextNode);
return expression.iterate(context);
}
catch (final Exception e)
{
if (getLogger().isDebugEnabled()) {
getLogger().debug("Failed to evaluate '" + str + "'", e);
}
// ignore it
return null;
}
}
private class Saxon7Context extends StandaloneContext
{
private final PrefixResolver resolver;
public Saxon7Context(NodeInfo node, PrefixResolver resolver)
{
super(node);
this.resolver = resolver;
}
public String getURIForPrefix(String prefix) throws XPathException
{
return resolver.prefixToNamespace(prefix);
}
}
}
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