/*
* 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.synapse.Mediator;
import org.apache.synapse.SynapseException;
import org.apache.synapse.mediators.filters.SwitchMediator;
import org.jaxen.JaxenException;
import javax.xml.namespace.QName;
import java.util.Iterator;
import java.util.Properties;
import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;
/**
* Factory for {@link SwitchMediator} instances.
* <p>
* Configuration syntax:
* <pre>
* <switch source="xpath">
* <case regex="string">
* mediator+
* </case>+
* <default>
* mediator+
* </default>?
* </switch>
* </pre>
*/
public class SwitchMediatorFactory extends AbstractMediatorFactory {
private static final QName SWITCH_Q
= new QName(XMLConfigConstants.SYNAPSE_NAMESPACE, "switch");
private static final QName CASE_Q
= new QName(XMLConfigConstants.SYNAPSE_NAMESPACE, "case");
private static final QName DEFAULT_Q
= new QName(XMLConfigConstants.SYNAPSE_NAMESPACE, "default");
public Mediator createSpecificMediator(OMElement elem, Properties properties) {
SwitchMediator switchMediator = new SwitchMediator();
OMAttribute source = elem.getAttribute(ATT_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 {
switchMediator.setSource(SynapsePathFactory.getSynapsePath(elem, ATT_SOURCE));
} catch (JaxenException e) {
String msg = "Invalid XPath for attribute 'source' : " + source.getAttributeValue();
log.error(msg);
throw new SynapseException(msg);
}
}
// after successfully creating the mediator
// set its common attributes such as tracing etc
processAuditStatus(switchMediator, elem);
Iterator iter = elem.getChildrenWithName(CASE_Q);
while (iter.hasNext()) {
OMElement caseElem = (OMElement) iter.next();
SwitchCase aCase = new SwitchCase();
OMAttribute regex = caseElem.getAttribute(ATT_REGEX);
if (regex == null) {
String msg = "The 'regex' attribute is required for a switch case definition";
log.error(msg);
throw new SynapseException(msg);
}
try {
aCase.setRegex(Pattern.compile(regex.getAttributeValue()));
} catch (PatternSyntaxException pse) {
String msg = "Invalid Regular Expression for attribute 'regex' : "
+ regex.getAttributeValue();
log.error(msg);
throw new SynapseException(msg);
}
aCase.setCaseMediator(AnonymousListMediatorFactory.createAnonymousListMediator(
caseElem, properties));
switchMediator.addCase(aCase);
}
iter = elem.getChildrenWithName(DEFAULT_Q);
while (iter.hasNext()) {
SwitchCase aCase = new SwitchCase();
aCase.setCaseMediator(AnonymousListMediatorFactory.createAnonymousListMediator(
(OMElement) iter.next(), properties));
switchMediator.setDefaultCase(aCase);
break; // add only the *first* default if multiple are specified, ignore rest if any
}
return switchMediator;
}
public QName getTagQName() {
return SWITCH_Q;
}
}