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ActiveMQ example source code file (XalanXPathEvaluator.java)
The ActiveMQ XalanXPathEvaluator.java source code/** * 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.activemq.filter; import java.io.StringReader; import javax.jms.BytesMessage; import javax.jms.JMSException; import javax.jms.TextMessage; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.xpath.XPath; import org.w3c.dom.Document; import org.w3c.dom.traversal.NodeIterator; import org.xml.sax.InputSource; import org.apache.activemq.command.Message; import org.apache.activemq.util.ByteArrayInputStream; import org.apache.xpath.CachedXPathAPI; import org.apache.xpath.objects.XObject; public class XalanXPathEvaluator implements XPathExpression.XPathEvaluator { private final String xpath; public XalanXPathEvaluator(String xpath) { this.xpath = xpath; } public boolean evaluate(Message m) throws JMSException { 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(); XObject result = cachedXPathAPI.eval(doc, xpath); if (result.bool()) return true; else { 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); //An XPath expression could return a true or false value instead of a node. //eval() is a better way to determine the boolean value of the exp. //For compliance with legacy behavior where selecting an empty node returns true, //selectNodeIterator is attempted in case of a failure. CachedXPathAPI cachedXPathAPI = new CachedXPathAPI(); XObject result = cachedXPathAPI.eval(doc, xpath); if (result.bool()) return true; else { NodeIterator iterator = cachedXPathAPI.selectNodeIterator(doc, xpath); return (iterator.nextNode() != null); } } catch (Throwable e) { return false; } } } Other ActiveMQ examples (source code examples)Here is a short list of links related to this ActiveMQ XalanXPathEvaluator.java source code file: |
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