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 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.SpnegoContextToken;
  
  import org.apache.neethi.Assertion;
  import org.apache.neethi.AssertionBuilderFactory;
  import org.apache.neethi.Constants;
  import org.apache.neethi.builders.AssertionBuilder;
  
  /**
   * 
   */
  public class SpnegoContextTokenBuilder implements AssertionBuilder<Element> {
  
      PolicyBuilder builder;
      public SpnegoContextTokenBuilder(PolicyBuilder b) {
          builder = b;
      }
      public QName[] getKnownElements() {
          return new QName[]{SP11Constants.SPNEGO_CONTEXT_TOKEN, SP12Constants.SPNEGO_CONTEXT_TOKEN};
      }
      
      public Assertion build(Element element, AssertionBuilderFactory factory)
          throws IllegalArgumentException {
          SPConstants consts = SP11Constants.SP_NS.equals(element.getNamespaceURI())
                  ? SP11Constants.INSTANCE : SP12Constants.INSTANCE;
          
          SpnegoContextToken spnegoContextToken = new SpnegoContextToken(consts);
          spnegoContextToken.setOptional(PolicyConstants.isOptional(element));
          spnegoContextToken.setIgnorable(PolicyConstants.isIgnorable(element));
          
          String attribute = DOMUtils.getAttribute(element, consts.getIncludeToken());
          if (attribute != null) {
              spnegoContextToken.setInclusion(consts.getInclusionFromAttributeValue(attribute.trim()));
          }
  
          Element elem = DOMUtils.getFirstElement(element);
          boolean foundPolicy = false;
          while (elem != null) {
              QName qn = DOMUtils.getElementQName(elem);
              if (Constants.isPolicyElement(qn)) {
                  foundPolicy = true;
                  if (DOMUtils.getFirstChildWithName(elem, consts.getNamespace(),
                          SPConstants.REQUIRE_DERIVED_KEYS) != null) {
                      spnegoContextToken.setDerivedKeys(true);
                  } else if (DOMUtils.getFirstChildWithName(elem, 
                          SP12Constants.REQUIRE_IMPLIED_DERIVED_KEYS) != null) {
                      spnegoContextToken.setImpliedDerivedKeys(true);
                  } else if (DOMUtils.getFirstChildWithName(elem, 
                          SP12Constants.REQUIRE_EXPLICIT_DERIVED_KEYS) != null) {
                      spnegoContextToken.setExplicitDerivedKeys(true);
                  }
              } else if (consts.getNamespace().equals(qn.getNamespaceURI())
                      && SPConstants.ISSUER.equals(qn.getLocalPart())) {
                  spnegoContextToken.setIssuerEpr(DOMUtils.getFirstElement(elem));
              }
              elem = DOMUtils.getNextElement(elem);
          }
          
          if (!foundPolicy && consts != SP11Constants.INSTANCE) {
              throw new IllegalArgumentException(
                  "sp:SpnegoContextToken/wsp:Policy must have a value"
              );
          }
          return spnegoContextToken;
      }
  
  }
  