/*
* 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.config.xml;
import org.apache.axiom.om.OMElement;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.synapse.SynapseException;
import org.apache.synapse.Mediator;
import org.apache.synapse.mediators.base.TryMediator;
import javax.xml.namespace.QName;
import java.util.Iterator;
/**
* Builds an instance of a Try mediator through the Synapse configuration. It follows the following
*
* <pre>
* <try>
* <sequence>
* mediator+
* </sequence>
* <onError>
* mediator+
* </onError>
* <finally>
* mediator+
* </finally>?
* </try>
* </pre>
*/
public class TryMediatorFactory extends AbstractListMediatorFactory {
private static final Log log = LogFactory.getLog(TryMediatorFactory.class);
private static final QName TRY_Q = new QName(Constants.SYNAPSE_NAMESPACE, "try");
public Mediator createMediator(OMElement elem) {
TryMediator tryMediator = new TryMediator();
// process sequence of the try mediator
OMElement seq = elem.getFirstChildWithName(
new QName(Constants.SYNAPSE_NAMESPACE, "sequence"));
if (seq != null) {
super.addChildren(seq, tryMediator);
} else {
handleException("A 'sequence' element is required for a 'try' mediator");
}
// process onError mediators
OMElement error = elem.getFirstChildWithName(
new QName(Constants.SYNAPSE_NAMESPACE, "onError"));
if (error != null) {
Iterator it = error.getChildElements();
while (it.hasNext()) {
OMElement child = (OMElement) it.next();
Mediator med = MediatorFactoryFinder.getInstance().getMediator(child);
if (med != null) {
tryMediator.getErrorHandlerMediators().add(med);
} else {
handleException("Unknown mediator : " + child.getLocalName());
}
}
} else {
handleException("A 'onError' element is required for a 'try' mediator");
}
// process finally mediators - if any
OMElement fin = elem.getFirstChildWithName(
new QName(Constants.SYNAPSE_NAMESPACE, "finally"));
if (fin != null) {
Iterator it = fin.getChildElements();
while (it.hasNext()) {
OMElement child = (OMElement) it.next();
Mediator med = MediatorFactoryFinder.getInstance().getMediator(child);
if (med != null) {
tryMediator.getFinallyMediators().add(med);
} else {
handleException("Unknown mediator : " + child.getLocalName());
}
}
}
return tryMediator;
}
private void handleException(String msg) {
log.error(msg);
throw new SynapseException(msg);
}
public QName getTagQName() {
return TRY_Q;
}
}