/*
* 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.OMAttribute;
import org.apache.axiom.om.OMElement;
import org.apache.axiom.om.xpath.AXIOMXPath;
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.filters.SwitchCaseMediator;
import org.apache.synapse.mediators.filters.SwitchMediator;
import org.jaxen.JaxenException;
import javax.xml.namespace.QName;
import java.util.Iterator;
/**
* Constructs a Switch mediator instance from the given XML configuration
*
* <pre>
* <switch source="xpath">
* <case regex="string">
* mediator+
* </case>+
* <default>
* mediator+
* </default>?
* </switch>
* </pre>
*/
public class SwitchMediatorFactory implements MediatorFactory {
private static final Log log = LogFactory.getLog(SwitchMediatorFactory.class);
private static final QName SWITCH_Q = new QName(Constants.SYNAPSE_NAMESPACE, "switch");
private static final QName CASE_Q = new QName(Constants.SYNAPSE_NAMESPACE, "case");
private static final QName DEFAULT_Q = new QName(Constants.SYNAPSE_NAMESPACE, "default");
public Mediator createMediator(OMElement elem) {
SwitchMediator switchMediator = new SwitchMediator();
OMAttribute source = elem.getAttribute(new QName(Constants.NULL_NAMESPACE, "source"));
if (source == null) {
String msg = "A 'source' XPath attribute is required for a switch mediator";
log.error(msg);
throw new SynapseException(msg);
} else {
try {
AXIOMXPath sourceXPath = new AXIOMXPath(source.getAttributeValue());
org.apache.synapse.config.xml.OMElementUtils.addNameSpaces(sourceXPath, elem, log);
switchMediator.setSource(sourceXPath);
} catch (JaxenException e) {
String msg = "Invalid XPath for attribute 'source' : " + source.getAttributeValue();
log.error(msg);
throw new SynapseException(msg);
}
}
Iterator iter = elem.getChildrenWithName(CASE_Q);
while (iter.hasNext()) {
switchMediator.addCase((SwitchCaseMediator)
MediatorFactoryFinder.getInstance().getMediator((OMElement) iter.next()));
}
iter = elem.getChildrenWithName(DEFAULT_Q);
while (iter.hasNext()) {
switchMediator.addCase((SwitchCaseMediator)
MediatorFactoryFinder.getInstance().getMediator((OMElement) iter.next()));
break; // add only the *first* default if multiple are specified, ignore rest if any
}
return switchMediator;
}
public QName getTagQName() {
return SWITCH_Q;
}
}