MessageStoreMediatorFactory.java
/*
* Copyright (c) 2005-2010, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
*
* WSO2 Inc. 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.config.xml;
import org.apache.axiom.om.OMAttribute;
import org.apache.axiom.om.OMElement;
import org.apache.synapse.Mediator;
import org.apache.synapse.SynapseException;
import org.apache.synapse.mediators.store.MessageStoreMediator;
import org.jaxen.JaxenException;
import javax.xml.namespace.QName;
import java.util.Properties;
/**
* Creates an instance of a MessageStore mediator using XML configuration specified
*
* <pre>
* <store messageStore = "message store name" [sequence = "sequence name"] />
* </pre>
*
* TODO Message store mediator will be improved with more user options
*/
public class MessageStoreMediatorFactory extends AbstractMediatorFactory{
private static final QName STORE_Q = new QName(XMLConfigConstants.SYNAPSE_NAMESPACE, "store");
private static final QName ATT_MESSAGE_STORE = new QName("messageStore");
private static final QName ATT_SEQUENCE = new QName("sequence");
@Override
protected Mediator createSpecificMediator(OMElement elem, Properties properties) {
MessageStoreMediator messageStoreMediator = new MessageStoreMediator();
processAuditStatus(messageStoreMediator, elem);
OMAttribute nameAtt = elem.getAttribute(ATT_NAME);
if(nameAtt != null) {
messageStoreMediator.setName(nameAtt.getAttributeValue());
}
OMAttribute messageStoreNameAtt = elem.getAttribute(ATT_MESSAGE_STORE);
if (messageStoreNameAtt != null) {
if (checkForExpression(messageStoreNameAtt)) {
String path = messageStoreNameAtt.getAttributeValue().substring(1, messageStoreNameAtt.getAttributeValue().length()-1);
try {
messageStoreMediator.setMessageStoreExp(SynapsePathFactory.getSynapsePath(elem, path));
} catch (JaxenException e) {
String msg = "Invalid XPath expression for attribute 'messageStore' : " + messageStoreNameAtt
.getAttributeValue();
throw new SynapseException(msg, e);
}
} else {
messageStoreMediator.setMessageStoreName(messageStoreNameAtt.getAttributeValue());
}
} else {
throw new SynapseException("Message Store mediator must have a Message store defined");
}
OMAttribute sequenceAtt = elem.getAttribute(ATT_SEQUENCE);
if(sequenceAtt != null) {
messageStoreMediator.setOnStoreSequence(sequenceAtt.getAttributeValue());
}
addAllCommentChildrenToList(elem, messageStoreMediator.getCommentsList());
return messageStoreMediator;
}
public QName getTagQName() {
return STORE_Q;
}
/**
* Checks whether the value of the attribute is enclosed by curly braces.
* If yes, the value is taken as an expression.
* Else, it will be a string value.
*
* @param atr the atrribute whose value is checked for enclosing curly braces.
* @return true if the value is enclosed by curly braces.
*/
private boolean checkForExpression(OMAttribute atr){
return ((atr.getAttributeValue().startsWith("{")) && (atr.getAttributeValue().endsWith("}")));
}
}