/**
    * 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.wss4j.policy.model;
  
  import org.apache.neethi.Assertion;
  import org.apache.neethi.Policy;
  import org.apache.neethi.PolicyComponent;
  import org.apache.neethi.PolicyContainingAssertion;
  import org.apache.wss4j.policy.SPConstants;
  import org.apache.wss4j.policy.SPConstants.SPVersion;
  
  import javax.xml.stream.XMLStreamException;
  import javax.xml.stream.XMLStreamWriter;
  import java.util.Iterator;
  import java.util.List;
  
  public abstract class AbstractBinding extends AbstractSecurityAssertion implements PolicyContainingAssertion {
  
      private Policy nestedPolicy;
      private AlgorithmSuite algorithmSuite;
      private Layout layout;
      private boolean includeTimestamp;
  
      protected AbstractBinding(SPConstants.SPVersion version, Policy nestedPolicy) {
          super(version);
          this.nestedPolicy = nestedPolicy;
          parseNestedBindingPolicy(nestedPolicy, this);
          if (layout == null) {
              layout = new Layout(version, new Policy());
          }
      }
  
      @Override
      public Policy getPolicy() {
          return nestedPolicy;
      }
  
      @Override
      public boolean equals(Object object) {
          if (object == this) {
              return true;
          }
  
          if (!(object instanceof AbstractBinding)) {
              return false;
          }
  
          AbstractBinding that = (AbstractBinding)object;
          if (algorithmSuite != null && !algorithmSuite.equals(that.algorithmSuite)
              || algorithmSuite == null && that.algorithmSuite != null) {
              return false;
          }
  
          if (layout != null && !layout.equals(that.layout)
              || layout == null && that.layout != null) {
              return false;
          }
  
          if (includeTimestamp != that.includeTimestamp) {
              return false;
          }
  
          return super.equals(object);
      }
  
      @Override
      public int hashCode() {
          int result = 17;
          if (algorithmSuite != null) {
              result = 31 * result + algorithmSuite.hashCode();
          }
          if (layout != null) {
              result = 31 * result + layout.hashCode();
          }
          result = 31 * result + Boolean.hashCode(includeTimestamp);
  
          return 31 * result + super.hashCode();
      }
  
      @Override
      public PolicyComponent normalize() {
          return super.normalize(getPolicy());
      }
 
     @Override
     public void serialize(XMLStreamWriter writer) throws XMLStreamException {
         super.serialize(writer, getPolicy());
     }
 
     protected void parseNestedBindingPolicy(Policy nestedPolicy, AbstractBinding binding) {
         Iterator<List<Assertion>> alternatives = nestedPolicy.getAlternatives();
         //we just process the first alternative
         //this means that if we have a compact policy only the first alternative is visible
         //in contrary to a normalized policy where just one alternative exists
         if (alternatives.hasNext()) {
             List<Assertion> assertions = alternatives.next();
             for (Assertion assertion : assertions) {
                 String assertionName = assertion.getName().getLocalPart();
                 if (SPConstants.ALGORITHM_SUITE.equals(assertionName)) {
                     if (binding.getAlgorithmSuite() != null) {
                         throw new IllegalArgumentException(SPConstants.ERR_INVALID_POLICY);
                     }
                     binding.setAlgorithmSuite((AlgorithmSuite) assertion);
                     continue;
                 }
                 if (SPConstants.LAYOUT.equals(assertionName)) {
                     if (binding.getLayout() != null) {
                         throw new IllegalArgumentException(SPConstants.ERR_INVALID_POLICY);
                     }
                     Layout layout = (Layout) assertion;
                     binding.setLayout(layout);
                     if (layout.getLayoutType() == Layout.LayoutType.LaxTsFirst
                             || layout.getLayoutType() == Layout.LayoutType.LaxTsLast) {
                         binding.setIncludeTimestamp(true);
                     }
                     continue;
                 }
                 if (SPConstants.INCLUDE_TIMESTAMP.equals(assertionName)) {
                     binding.setIncludeTimestamp(true);
                     continue;
                 }
             }
         }
         if (binding.getAlgorithmSuite() == null && binding.getVersion() != SPVersion.SP11) {
             throw new IllegalArgumentException("sp:" + getName().getLocalPart()
                                                + " must have an inner sp:AlgorithmSuite element");
         }
     }
 
     public AlgorithmSuite getAlgorithmSuite() {
         return algorithmSuite;
     }
 
     protected void setAlgorithmSuite(AlgorithmSuite algorithmSuite) {
         this.algorithmSuite = algorithmSuite;
     }
 
     public Layout getLayout() {
         return layout;
     }
 
     protected void setLayout(Layout layout) {
         this.layout = layout;
     }
 
     public boolean isIncludeTimestamp() {
         return includeTimestamp;
     }
 
     protected void setIncludeTimestamp(boolean includeTimestamp) {
         this.includeTimestamp = includeTimestamp;
     }
 }