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/*
* 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.tuscany.sca.policy.util;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Hashtable;
import java.util.List;
import java.util.Map;
import java.util.Set;
import javax.xml.namespace.QName;
import org.apache.tuscany.sca.extensibility.ServiceDeclaration;
import org.apache.tuscany.sca.extensibility.ServiceDiscovery;
/**
* Utility class for loading policy handler definitions from META-INF/services directories
*
* @version $Rev$ $Date$
*/
public class PolicyHandlerDefinitionsLoader {
public static Map<ClassLoader, List<PolicyHandlerTuple>> loadPolicyHandlerClassnames() {
// Get the processor service declarations
Set<ServiceDeclaration> sds;
try {
sds = ServiceDiscovery.getInstance().getServiceDeclarations(PolicyHandler.class);
} catch (IOException e) {
throw new IllegalStateException(e);
}
Map<ClassLoader, List<PolicyHandlerTuple>> handlerTuples = new Hashtable<ClassLoader, List<PolicyHandlerTuple>>();
for (ServiceDeclaration sd : sds) {
ClassLoader cl = sd.getClassLoader();
List<PolicyHandlerTuple> handlerTupleList = handlerTuples.get(cl);
if ( handlerTupleList == null ) {
handlerTupleList = new ArrayList<PolicyHandlerTuple>();
handlerTuples.put(cl, handlerTupleList);
}
Map<String, String> attributes = sd.getAttributes();
String intentName = attributes.get("intent");
QName intentQName = getQName(intentName);
String policyModelClassName = attributes.get("model");
String appliesTo = attributes.get("appliesTo");
if ( appliesTo != null && !appliesTo.startsWith("/") ) {
appliesTo = "//" + appliesTo;
}
handlerTupleList.add(new PolicyHandlerTuple(sd.getClassName(), intentQName, policyModelClassName, appliesTo));
}
return handlerTuples;
}
private static QName getQName(String qname) {
if (qname == null) {
return null;
}
qname = qname.trim();
if (qname.startsWith("{")) {
int h = qname.indexOf('}');
if (h != -1) {
return new QName(qname.substring(1, h), qname.substring(h + 1));
}
} else {
int h = qname.indexOf('#');
if (h != -1) {
return new QName(qname.substring(0, h), qname.substring(h + 1));
}
}
throw new IllegalArgumentException("Invalid qname: " + qname);
}
}
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