code: /**
   * 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.security.policy.builders;
  
  import java.util.Iterator;
  import java.util.List;
  
  import javax.xml.namespace.QName;
  
  import org.w3c.dom.Element;
  
  import org.apache.cxf.helpers.DOMUtils;
  import org.apache.cxf.ws.policy.PolicyBuilder;
  import org.apache.cxf.ws.security.policy.SP11Constants;
  import org.apache.cxf.ws.security.policy.SP12Constants;
  import org.apache.cxf.ws.security.policy.SPConstants;
  import org.apache.cxf.ws.security.policy.model.AlgorithmSuite;
  import org.apache.cxf.ws.security.policy.model.Layout;
  import org.apache.cxf.ws.security.policy.model.ProtectionToken;
  import org.apache.cxf.ws.security.policy.model.SymmetricBinding;
  import org.apache.neethi.Assertion;
  import org.apache.neethi.AssertionBuilderFactory;
  import org.apache.neethi.Policy;
  import org.apache.neethi.builders.AssertionBuilder;
  
  
  public class SymmetricBindingBuilder implements AssertionBuilder<Element> {
      
      PolicyBuilder builder;
      public SymmetricBindingBuilder(PolicyBuilder b) {
          builder = b;
      }
      public QName[] getKnownElements() {
          return new QName[]{SP11Constants.SYMMETRIC_BINDING, SP12Constants.SYMMETRIC_BINDING};
      }
      
      public Assertion build(Element element, AssertionBuilderFactory factory)
          throws IllegalArgumentException {
          
          SPConstants consts = SP11Constants.SP_NS.equals(element.getNamespaceURI())
              ? SP11Constants.INSTANCE : SP12Constants.INSTANCE;
  
          SymmetricBinding symmetricBinding = new SymmetricBinding(consts, builder);
  
          Policy policy = builder.getPolicy(DOMUtils.getFirstElement(element));
          policy = policy.normalize(builder.getPolicyRegistry(), false);
  
          Iterator<List<Assertion>> iterator = policy.getAlternatives();
          if (!iterator.hasNext()) {
              throw new IllegalArgumentException(
                  "sp:SymmetricBinding must specify at least one alternative"
              );
          }
          processAlternatives(iterator.next(), symmetricBinding, consts);
  
          return symmetricBinding;
      }
  
  
      private void processAlternatives(List<Assertion> assertions,
                                       SymmetricBinding symmetricBinding, SPConstants consts) {
          QName name;
          boolean foundAlgorithmSuite = false;
          for (Assertion assertion : assertions) {
              name = assertion.getName();
  
              if (!consts.getNamespace().equals(name.getNamespaceURI())
                  && !SP12Constants.INSTANCE.getNamespace().equals(name.getNamespaceURI())) {
                  continue;
              }
  
              if (SPConstants.ALGO_SUITE.equals(name.getLocalPart())) {
                  foundAlgorithmSuite = true;
                  symmetricBinding.setAlgorithmSuite((AlgorithmSuite)assertion);
  
              } else if (SPConstants.LAYOUT.equals(name.getLocalPart())) {
                  symmetricBinding.setLayout((Layout)assertion);
  
              } else if (SPConstants.INCLUDE_TIMESTAMP.equals(name.getLocalPart())) {
                  symmetricBinding.setIncludeTimestamp(true);
  
              } else if (SPConstants.PROTECTION_TOKEN.equals(name.getLocalPart())) {
                  symmetricBinding.setProtectionToken((ProtectionToken)assertion);
  
              } else if (SPConstants.ENCRYPT_BEFORE_SIGNING.equals(name.getLocalPart())) {
                  symmetricBinding.setProtectionOrder(SPConstants.ProtectionOrder.EncryptBeforeSigning);
  
              } else if (SPConstants.SIGN_BEFORE_ENCRYPTING.equals(name.getLocalPart())) {
                  symmetricBinding.setProtectionOrder(SPConstants.ProtectionOrder.SignBeforeEncrypting);
  
              } else if (SPConstants.ONLY_SIGN_ENTIRE_HEADERS_AND_BODY.equals(name.getLocalPart())) {
                  symmetricBinding.setEntireHeadersAndBodySignatures(true);
              } else if (SPConstants.ENCRYPT_SIGNATURE.equals(name.getLocalPart())) {
                  symmetricBinding.setSignatureProtection(true);
              } else if (SPConstants.PROTECT_TOKENS.equals(name.getLocalPart())) {
                  symmetricBinding.setTokenProtection(true);
              } 
          }
          
          if (!foundAlgorithmSuite && consts != SP11Constants.INSTANCE) {
              throw new IllegalArgumentException(
                  "sp:SymmetricBinding/wsp:Policy/sp:AlgorithmSuite must have a value"
              );
          }
      }
  }
  