/*
    * 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.composite;
  
  import javax.el.MethodExpression;
  import javax.faces.view.facelets.ComponentConfig;
  import javax.faces.view.facelets.ComponentHandler;
  import javax.faces.view.facelets.FaceletContext;
  import javax.faces.view.facelets.MetaRule;
  import javax.faces.view.facelets.MetaRuleset;
  import javax.faces.view.facelets.Metadata;
  import javax.faces.view.facelets.MetadataTarget;
  import javax.faces.view.facelets.TagAttribute;
  
  public class SimpleComponentTagHandler extends ComponentHandler
  {
  
      public SimpleComponentTagHandler(ComponentConfig config)
      {
          super(config);
          // TODO Auto-generated constructor stub
      }
  
      @Override
      protected MetaRuleset createMetaRuleset(Class type)
      {
          return super.createMetaRuleset(type).addRule(new CustomMethodRule());
      }
  
      public final class CustomMethodRule extends MetaRule {
  
          @Override
          public Metadata applyRule(String name, TagAttribute attribute,
                  MetadataTarget meta)
          {
              if (meta.isTargetInstanceOf(SimpleComponent.class))
              {
                  if ("customMethod".equals(name))
                  {
                      return new SimpleMethodMapper(attribute);
                  }
              }
              return null;
          }
          
      }
      
      final static class SimpleMethodMapper extends Metadata
      {
          private final TagAttribute _attr;
          
          public final static Class<?>[] CUSTOM_METHOD_SIG = new Class[]{String.class};
  
          public SimpleMethodMapper(TagAttribute attr)
          {
              this._attr = attr;
          }
  
          public void applyMetadata(FaceletContext ctx, Object instance)
          {
              MethodExpression expr = _attr.getMethodExpression(ctx, null, CUSTOM_METHOD_SIG);
              ((SimpleComponent) instance).setCustomMethod(expr);
          }
      }
  
  }