/**
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.qpid.server.filter;
//
// Based on like named file from r450141 of the Apache ActiveMQ project <http://www.activemq.org/site/home.html>
//
import java.io.ByteArrayInputStream;
import java.io.StringReader;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.apache.qpid.AMQException;
import org.apache.qpid.server.queue.AMQMessage;
import org.apache.qpid.server.queue.Filterable;
import org.apache.xpath.CachedXPathAPI;
import org.w3c.dom.Document;
import org.w3c.dom.traversal.NodeIterator;
import org.xml.sax.InputSource;
public class XalanXPathEvaluator implements XPathExpression.XPathEvaluator {
private final String xpath;
public XalanXPathEvaluator(String xpath) {
this.xpath = xpath;
}
public boolean evaluate(Filterable m) throws AMQException
{
// TODO - we would have to check the content type and then evaluate the content
// here... is this really a feature we wish to implement? - RobG
/*
if( m instanceof TextMessage ) {
String text = ((TextMessage)m).getText();
return evaluate(text);
} else if ( m instanceof BytesMessage ) {
BytesMessage bm = (BytesMessage) m;
byte data[] = new byte[(int) bm.getBodyLength()];
bm.readBytes(data);
return evaluate(data);
}
*/
return false;
}
private boolean evaluate(byte[] data) {
try {
InputSource inputSource = new InputSource(new ByteArrayInputStream(data));
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
factory.setNamespaceAware(true);
DocumentBuilder dbuilder = factory.newDocumentBuilder();
Document doc = dbuilder.parse(inputSource);
CachedXPathAPI cachedXPathAPI = new CachedXPathAPI();
NodeIterator iterator = cachedXPathAPI.selectNodeIterator(doc,xpath);
return iterator.nextNode()!=null;
} catch (Throwable e) {
return false;
}
}
private boolean evaluate(String text) {
try {
InputSource inputSource = new InputSource(new StringReader(text));
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
factory.setNamespaceAware(true);
DocumentBuilder dbuilder = factory.newDocumentBuilder();
Document doc = dbuilder.parse(inputSource);
// We should associated the cachedXPathAPI object with the message being evaluated
// since that should speedup subsequent xpath expressions.
CachedXPathAPI cachedXPathAPI = new CachedXPathAPI();
NodeIterator iterator = cachedXPathAPI.selectNodeIterator(doc,xpath);
return iterator.nextNode()!=null;
} catch (Throwable e) {
return false;
}
}
}