| /** |
| * 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; |
| } |
| } |
| } |