/**
* 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.cxf.ws.policy.selector;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import org.apache.cxf.message.Message;
import org.apache.cxf.ws.policy.Assertor;
import org.apache.cxf.ws.policy.PolicyEngine;
import org.apache.neethi.Assertion;
import org.apache.neethi.Policy;
/**
*
*/
public class MinimalAlternativeSelector extends BaseAlternativeSelector {
public Collection<Assertion> selectAlternative(
Policy policy, PolicyEngine engine,
Assertor assertor,
List<List<Assertion>> request,
Message msg) {
Collection<Assertion> choice = null;
Iterator<List<Assertion>> alternatives = policy.getAlternatives();
while (alternatives.hasNext()) {
List<Assertion> alternative = alternatives.next();
if (engine.supportsAlternative(alternative, assertor, msg)
&& isCompatibleWithRequest(alternative, request)) {
if (null == choice) {
choice = alternative;
} else if (request != null) {
//we have a request policy, we likely want the one longest alternative that
//matches as any of "optional" incoming policies so that asssertions that were
//asserted on the incoming will also be assertable on the outgoing.
//Example: ws:addressing policy asserted on incoming should also be
// used to add headers for the response
if (alternative.size() > choice.size()) {
choice = alternative;
}
} else if (alternative.size() < choice.size()) {
choice = alternative;
}
}
}
if (choice == null) {
// didn't find one completely compatible with the incoming, just get the minimal
alternatives = policy.getAlternatives();
while (alternatives.hasNext()) {
List<Assertion> alternative = alternatives.next();
if (engine.supportsAlternative(alternative, assertor, msg)
&& (null == choice || alternative.size() < choice.size())) {
choice = alternative;
}
}
}
return choice;
}
}