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.Bus;
  import org.apache.cxf.helpers.DOMUtils;
  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.WSSPolicyException;
  import org.apache.cxf.ws.security.policy.custom.AlgorithmSuiteLoader;
  import org.apache.cxf.ws.security.policy.custom.DefaultAlgorithmSuiteLoader;
  import org.apache.cxf.ws.security.policy.model.AlgorithmSuite;
  import org.apache.neethi.Assertion;
  import org.apache.neethi.AssertionBuilderFactory;
  import org.apache.neethi.builders.AssertionBuilder;
  
  
  public class AlgorithmSuiteBuilder implements AssertionBuilder<Element> {
      
      private Bus bus;
  
      public AlgorithmSuiteBuilder(Bus bus) {
          this.bus = bus;
      }
      
      public Assertion build(Element element, AssertionBuilderFactory factory)
          throws IllegalArgumentException {
          
          SPConstants consts = SP11Constants.SP_NS.equals(element.getNamespaceURI())
              ? SP11Constants.INSTANCE : SP12Constants.INSTANCE;
  
          AlgorithmSuiteLoader loader = bus.getExtension(AlgorithmSuiteLoader.class);
          if (loader == null) {
              loader = new DefaultAlgorithmSuiteLoader();
          } 
          Element policyElement = DOMUtils.getFirstElement(element);
          if (policyElement == null) {
              throw new IllegalArgumentException(
                  "sp:AlgorithmSuite/wsp:Policy must have a value"
              );
          }
          AlgorithmSuite algorithmSuite = null;
          try {
              algorithmSuite = loader.getAlgorithmSuite(policyElement, consts);
          } catch (WSSPolicyException e) {
              throw new IllegalArgumentException(e);
          }
          
          if (algorithmSuite == null && consts != SP11Constants.INSTANCE) {
              String algorithmSuiteName = DOMUtils.getFirstElement(policyElement).getLocalName();
              throw new IllegalArgumentException(
                  "Algorithm suite \"" + algorithmSuiteName + "\" is not registered"
              );
          }
  
          return algorithmSuite;
      }
  
      public QName[] getKnownElements() {
          return new QName[]{SP11Constants.ALGORITHM_SUITE, SP12Constants.ALGORITHM_SUITE};
      }
  
  }
  