/*
    * Copyright 2010 the original author or authors.
    * 
    * Licensed 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.openehealth.ipf.commons.ihe.ws;
  
  import java.util.List;
  
  import org.apache.cxf.interceptor.Interceptor;
  import org.apache.cxf.interceptor.InterceptorProvider;
  import org.apache.cxf.message.Exchange;
  import org.apache.cxf.message.Message;
  
  /**
   * Helper methods for handling user-defined custom interceptors.
   * @author Dmytro Rud
   */
  abstract public class InterceptorUtils {
  
      private InterceptorUtils() {
          throw new IllegalStateException("Cannot instantiate utility class");
      }
  
      
      public static void copyInterceptorsFromProvider(
              InterceptorProvider source, 
              InterceptorProvider target) 
      {
          if (source != null) {
              copyInterceptorsFromList(source.getInInterceptors(), 
                                       target.getInInterceptors());
              copyInterceptorsFromList(source.getInFaultInterceptors(), 
                                       target.getInFaultInterceptors());
              copyInterceptorsFromList(source.getOutInterceptors(), 
                                       target.getOutInterceptors());
              copyInterceptorsFromList(source.getOutFaultInterceptors(), 
                                       target.getOutFaultInterceptors());
          }
      }
  
      private static void copyInterceptorsFromList(
              List<Interceptor<? extends Message>> source, 
              List<Interceptor<? extends Message>> target) 
      {
          if (source != null) {
              target.addAll(source);
          }
      }
  
  
      /**
       * Searches for a property in all available contexts
       * associated with the given SOAP message.
       *
       * @param message
       *      CXF message.
       * @param propertyName
       *      name of the property.
       * @param <T>
       *      type of the property.
       * @return
       *      property value, or <code>null</code> when not found.
       */
      public static <T> T findContextualProperty(Message message, String propertyName) {
          Exchange exchange = message.getExchange();
          Message[] messages = new Message[] {
                  message,
                  exchange.getInMessage(),
                  exchange.getOutMessage(),
                  exchange.getInFaultMessage(),
                  exchange.getOutFaultMessage()
          };
  
          for (Message m : messages) {
              if (m != null) {
                  T t  = (T) m.getContextualProperty(propertyName);
                  if (t != null) {
                      return t;
                  }
              }
          }
          return null;
      }
  
  }