| /** |
| * 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 org.apache.activemq.command.Message; |
| import org.apache.activemq.util.ByteArrayInputStream; |
| import org.w3c.dom.Document; |
| import org.xml.sax.InputSource; |
| |
| import javax.jms.BytesMessage; |
| import javax.jms.JMSException; |
| import javax.jms.TextMessage; |
| import javax.xml.parsers.DocumentBuilder; |
| import javax.xml.xpath.XPath; |
| import javax.xml.xpath.XPathConstants; |
| import javax.xml.xpath.XPathFactory; |
| import java.io.StringReader; |
| |
| public class XalanXPathEvaluator implements XPathExpression.XPathEvaluator { |
| |
| private static final XPathFactory FACTORY = XPathFactory.newInstance(); |
| private final String xpathExpression; |
| private final DocumentBuilder builder; |
| private final XPath xpath = FACTORY.newXPath(); |
| |
| public XalanXPathEvaluator(String xpathExpression, DocumentBuilder builder) throws Exception { |
| this.xpathExpression = xpathExpression; |
| if (builder != null) { |
| this.builder = builder; |
| } else { |
| throw new RuntimeException("No document builder available"); |
| } |
| } |
| |
| 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)); |
| Document inputDocument = builder.parse(inputSource); |
| return ((Boolean) xpath.evaluate(xpathExpression, inputDocument, XPathConstants.BOOLEAN)).booleanValue(); |
| } catch (Exception e) { |
| return false; |
| } |
| } |
| |
| private boolean evaluate(String text) { |
| try { |
| InputSource inputSource = new InputSource(new StringReader(text)); |
| Document inputDocument = builder.parse(inputSource); |
| return ((Boolean) xpath.evaluate(xpathExpression, inputDocument, XPathConstants.BOOLEAN)).booleanValue(); |
| } catch (Exception e) { |
| return false; |
| } |
| } |
| |
| @Override |
| public String toString() { |
| return xpathExpression; |
| } |
| } |