/* * 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.synapse.eventing.filters; import org.apache.axis2.context.MessageContext; import org.apache.synapse.util.xpath.SynapseXPath; import org.apache.synapse.SynapseException; import org.apache.axiom.om.xpath.AXIOMXPath; import org.apache.axiom.om.OMElement; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.wso2.eventing.EventFilter; import org.wso2.eventing.Event; import org.jaxen.JaxenException; /** * Topic baed event filter that match the subscription based on a given topic */ public class TopicBasedEventFilter implements EventFilter<MessageContext> { private AXIOMXPath sourceXpath; private String resultValue; private static final String FILTER_SEP = "/"; private static final Log log = LogFactory.getLog(TopicBasedEventFilter.class); public String getResultValue() { return resultValue; } public void setResultValue(String resultValue) { this.resultValue = resultValue; } public String toString() { return resultValue; } public AXIOMXPath getSourceXpath() { return sourceXpath; } public void setSourceXpath(SynapseXPath sourceXpath) { this.sourceXpath = sourceXpath; } public boolean match(Event<MessageContext> event) { MessageContext messageContext = event.getMessage(); String evaluatedValue = null; try { OMElement topicNode = (OMElement) sourceXpath.selectSingleNode( messageContext.getEnvelope()); if (topicNode != null) { evaluatedValue = topicNode.getText(); } } catch (JaxenException e) { handleException("Error creating topic xpath",e); } if (evaluatedValue != null){ if (evaluatedValue.equals(resultValue)) { return true; } else if (evaluatedValue.startsWith((resultValue + FILTER_SEP).trim())) { return true; } } return false; } private void handleException(String message, Exception e) { log.error(message, e); throw new SynapseException(message, e); } }