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.policy.PolicyConstants;
  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.InitiatorSignatureToken;
  import org.apache.cxf.ws.security.policy.model.Token;
  import org.apache.neethi.Assertion;
  import org.apache.neethi.AssertionBuilderFactory;
  import org.apache.neethi.Policy;
  import org.apache.neethi.builders.AssertionBuilder;
  
  public class InitiatorSignatureTokenBuilder implements AssertionBuilder<Element> {
      
      PolicyBuilder builder;
      public InitiatorSignatureTokenBuilder(PolicyBuilder b) {
          builder = b;
      }
      public QName[] getKnownElements() {
          return new QName[]{SP11Constants.INITIATOR_SIGNATURE_TOKEN, SP12Constants.INITIATOR_SIGNATURE_TOKEN};
      }
      
      public Assertion build(Element element, AssertionBuilderFactory factory)
          throws IllegalArgumentException {
          
          SPConstants consts = SP11Constants.SP_NS.equals(element.getNamespaceURI())
              ? SP11Constants.INSTANCE : SP12Constants.INSTANCE;
  
          InitiatorSignatureToken initiatorToken = new InitiatorSignatureToken(consts, builder);
          initiatorToken.setOptional(PolicyConstants.isOptional(element));
          initiatorToken.setIgnorable(PolicyConstants.isIgnorable(element));
  
          Policy policy = builder.getPolicy(DOMUtils.getFirstElement(element));
          policy = policy.normalize(builder.getPolicyRegistry(), false);
  
          for (Iterator<List<Assertion>> iterator = policy.getAlternatives(); iterator.hasNext();) {
              processAlternative(iterator.next(), initiatorToken);
              break; // TODO process all the token that must be set ..
          }
  
          return initiatorToken;
      }
  
      private void processAlternative(List<Assertion> assertions, InitiatorSignatureToken parent) {
          for (Assertion token : assertions) {
              if (token instanceof Token) {
                  parent.setInitiatorSignatureToken((Token)token);
              }
          }
      }
  
  }
  