/*
* 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);
}
}