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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.util.List;
 
 
A utility that helps to navigate the policy model

Tuscany.spi.extension.asclient:
 
 public class PolicyHelper {
     public PolicySet getPolicySet(PolicySubject subjectQName policySetName) {
         for (PolicySet ps : subject.getPolicySets()) {
             if (ps.getName().equals(policySetName)) {
                 return ps;
             }
         }
         return null;
     }
 
     public Intent getIntent(Definitions subjectQName intentName) {
         for (Intent i : subject.getIntents()) {
             if (i.getName().equals(intentName)) {
                 return i;
             }
         }
         return null;
     }
 
     public PolicySet getPolicySet(Definitions subjectQName policySetName) {
         for (PolicySet ps : subject.getPolicySets()) {
             if (ps.getName().equals(policySetName)) {
                 return ps;
             }
         }
         return null;
     }
 
     public Intent getIntent(PolicySubject subjectQName intentName) {
         for (Intent i : subject.getRequiredIntents()) {
             if (i.getName().equals(intentName)) {
                 return i;
             }
         }
         return null;
     }
 
     public Collection<PolicyExpressiongetPolicyExpressions(PolicySubject subjectQName policyName) {
         Collection<PolicyExpressionpolicies = new ArrayList<PolicyExpression>();
         for (PolicySet ps : subject.getPolicySets()) {
             for (PolicyExpression exp : ps.getPolicies()) {
                 if (exp.getName().equals(policyName)) {
                     policies.add(exp);
                 }
             }
         }
         return policies;
     }
 
     public Collection<ObjectgetPolicies(PolicySubject subjectQName policyName) {
         Collection<Objectpolicies = new ArrayList<Object>();
         for (PolicySet ps : subject.getPolicySets()) {
             for (PolicyExpression exp : ps.getPolicies()) {
                 if (exp.getName().equals(policyName)) {
                     policies.add(exp.getPolicy());
                 }
             }
         }
         return policies;
     }
     
    public static PolicySet getPolicySet(Binding wsBindingQName intentName) {
        PolicySet returnPolicySet = null;
        if (wsBinding instanceof PolicySubject) {
            PolicySubject policiedBinding = (PolicySubject)wsBinding;
            for (PolicySet policySet : policiedBinding.getPolicySets()) {
                for (Intent intent : policySet.getProvidedIntents()) {
                    if (intent.getName().equals(intentName)) {
                        returnPolicySet = policySet;
                        break;
                    }
                }
            }
        }
        return returnPolicySet;
    }
    public static boolean isIntentRequired(Binding wsBindingQName intent) {
        if (wsBinding instanceof PolicySubject) {
            List<Intentintents = ((PolicySubject)wsBinding).getRequiredIntents();
            for (Intent i : intents) {
                if (intent.equals(i.getName())) {
                    return true;
                }
            }
        }
        return getPolicySet(wsBindingintent) != null;
    }    
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