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ActiveMQ example source code file (JAXPXPathEvaluator.java)
The ActiveMQ JAXPXPathEvaluator.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.xpath.XPath; import javax.xml.xpath.XPathConstants; import javax.xml.xpath.XPathExpressionException; import javax.xml.xpath.XPathFactory; import org.xml.sax.InputSource; import org.apache.activemq.command.Message; import org.apache.activemq.util.ByteArrayInputStream; public class JAXPXPathEvaluator implements XPathExpression.XPathEvaluator { private static final XPathFactory FACTORY = XPathFactory.newInstance(); private javax.xml.xpath.XPathExpression expression; public JAXPXPathEvaluator(String xpathExpression) { try { XPath xpath = FACTORY.newXPath(); expression = xpath.compile(xpathExpression); } catch (XPathExpressionException e) { throw new RuntimeException("Invalid XPath expression: " + xpathExpression); } } public boolean evaluate(Message message) throws JMSException { if (message instanceof TextMessage) { String text = ((TextMessage)message).getText(); return evaluate(text); } else if (message instanceof BytesMessage) { BytesMessage bm = (BytesMessage)message; 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)); return ((Boolean)expression.evaluate(inputSource, XPathConstants.BOOLEAN)).booleanValue(); } catch (XPathExpressionException e) { return false; } } private boolean evaluate(String text) { try { InputSource inputSource = new InputSource(new StringReader(text)); return ((Boolean)expression.evaluate(inputSource, XPathConstants.BOOLEAN)).booleanValue(); } catch (XPathExpressionException e) { return false; } } } Other ActiveMQ examples (source code examples)Here is a short list of links related to this ActiveMQ JAXPXPathEvaluator.java source code file: |
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