/*
    * 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.myfaces.view.facelets.tag;
  
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.List;
  
  import javax.faces.view.facelets.FaceletHandler;
  
  /**
   * This class was created to gather some code from latest Facelets not existing in latest JSF 2.0 spec.
   * Also, since it was created on the fly while converting, it's highly possible that methods in this class
   * should be moved in a more logical location and/or removed.
   *
   * @author Simon Lessard (latest modification by $Author$)
   * @version $Revision$ $Date$
   *
   * @since 2.0
   */
  public final class TagHandlerUtils
  {
  
      /**
       * Find the first occurence of a tag handler that is instanceof T
       *
       * @since 2.0.1
       * @param <T>
       * @param nextHandler
       * @param type
       * @return
       */
      public static <T> T findFirstNextByType(FaceletHandler nextHandler, Class<T> type)
      {
          if (type.isAssignableFrom(nextHandler.getClass()))
          {
              return (T)nextHandler;
          }
          else if (nextHandler instanceof javax.faces.view.facelets.CompositeFaceletHandler)
          {
              for (FaceletHandler handler :
                      ((javax.faces.view.facelets.CompositeFaceletHandler)nextHandler).getHandlers())
              {
                  if (type.isAssignableFrom(handler.getClass()))
                  {
                      return (T)handler;
                  }
              }
          }
          return null;
      }
  
      /**
       * From TagHandler:
       * protected final <T> Iterator<T> findNextByType(Class<T> type)
       *
       * @param type
       * @return
       */
      @SuppressWarnings("unchecked")
      public static <T> Collection<T> findNextByType(FaceletHandler nextHandler, Class<T> type)
      {
          List<T> found = new ArrayList<T>();
          if (type.isAssignableFrom(nextHandler.getClass()))
          {
              found.add((T)nextHandler);
          }
          else if (nextHandler instanceof javax.faces.view.facelets.CompositeFaceletHandler)
          {
              for (FaceletHandler handler :
                      ((javax.faces.view.facelets.CompositeFaceletHandler)nextHandler).getHandlers())
              {
                  if (type.isAssignableFrom(handler.getClass()))
                  {
                      found.add((T)handler);
                  }
              }
          }
  
          return found;
      }
  
      private TagHandlerUtils()
     {
 
     }
 
     public static  Collection<FaceletHandler> findNextByType(FaceletHandler nextHandler, Class<?> ... type1)
     {
         List<FaceletHandler> found = new ArrayList<FaceletHandler>();
         boolean isAssignable = false;
         for (int i = 0; i < type1.length && !isAssignable; i++)
         {
             isAssignable = type1[i].isAssignableFrom(nextHandler.getClass());
         }
         if (isAssignable)
         {
             found.add((FaceletHandler)nextHandler);
         }
         else if (nextHandler instanceof javax.faces.view.facelets.CompositeFaceletHandler)
         {
             for (FaceletHandler handler :
                     ((javax.faces.view.facelets.CompositeFaceletHandler)nextHandler).getHandlers())
             {
                 isAssignable = false;
                 for (int i = 0; i < type1.length && !isAssignable; i++)
                 {
                     isAssignable = type1[i].isAssignableFrom(handler.getClass());
                 }
                 if (isAssignable)
                 {
                     found.add((FaceletHandler)handler);
                 }
             }
         }
 
         return found;
     }
 
     public static  Collection<FaceletHandler> findNextByType(FaceletHandler nextHandler, Class<?> type1, Class<?> type2)
     {
         List<FaceletHandler> found = new ArrayList<FaceletHandler>();
         if (type1.isAssignableFrom(nextHandler.getClass()) || type2.isAssignableFrom(nextHandler.getClass()))
         {
             found.add((FaceletHandler)nextHandler);
         }
         else if (nextHandler instanceof javax.faces.view.facelets.CompositeFaceletHandler)
         {
             for (FaceletHandler handler :
                     ((javax.faces.view.facelets.CompositeFaceletHandler)nextHandler).getHandlers())
             {
                 if (type1.isAssignableFrom(handler.getClass()) || type2.isAssignableFrom(handler.getClass()))
                 {
                     found.add((FaceletHandler)handler);
                 }
             }
         }
         
         return found;
     }
 }