/*
    * 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.component.search;
  
  import javax.faces.component.UIComponent;
  import javax.faces.component.UIForm;
  import javax.faces.component.search.SearchExpressionContext;
  import javax.faces.component.search.SearchExpressionHint;
  import javax.faces.component.search.SearchKeywordContext;
  import javax.faces.component.search.SearchKeywordResolver;
  
  /**
   *
   */
  public class FormSearchKeywordResolver extends SearchKeywordResolver
  {
      public static final String FORM_KEYWORD = "form";
  
      @Override
      public void resolve(SearchKeywordContext expressionContext, UIComponent current, String keyword)
      {
          expressionContext.invokeContextCallback(closest(UIForm.class, current));
      }
      
      private static <T> T closest(Class<T> type, UIComponent base) 
      {
          UIComponent parent = base.getParent();
  
          while (parent != null) 
          {
              if (type.isAssignableFrom(parent.getClass())) 
              {
                  return (T) parent;
              }
  
              parent = parent.getParent();
          }
  
          return null;
      }    
      
      @Override
      public boolean isResolverForKeyword(SearchExpressionContext searchExpressionContext, String keyword)
      {
          return FORM_KEYWORD.equalsIgnoreCase(keyword);
      }
  
      @Override
      public boolean isPassthrough(SearchExpressionContext searchExpressionContext, String keyword)
      {
          if (searchExpressionContext.getExpressionHints() != null &&
              searchExpressionContext.getExpressionHints().contains(SearchExpressionHint.RESOLVE_CLIENT_SIDE))
          {
              return true;
          }
          else
          {
              return false;
          }
      }
      
      @Override
      public boolean isLeaf(SearchExpressionContext searchExpressionContext, String keyword)
      {
          return false;
      }
  
  }