/*

  * 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 javax.faces.view.facelets;

 /**

  * A base tag for wiring state to an object instance based on rules populated at the time of creating a MetaRuleset.

  */

 public abstract class MetaTagHandler extends TagHandler

 {

     private Class _lastType = Object.class;

     private Metadata _mapper;

     public MetaTagHandler(TagConfig config)

     {

         super(config);

     }

     /**

      * Extend this method in order to add your own rules.

      * 

      * @param type

      * @return

      * 

      * FIXME: EG _ GENERIC

      */

     protected abstract MetaRuleset createMetaRuleset(Class type);

     /**

      * Invoking/extending this method will cause the results of the created MetaRuleset to auto-wire state to 

      * the passed instance.

      * 

      * @param ctx

      * @param instance

      */

     protected void setAttributes(FaceletContext ctx, Object instance)

     {

         if (instance != null)

         {

             Class<?> type = instance.getClass();

             if (_mapper == null || !_lastType.equals(type))

             {

                 _lastType = type;

                 _mapper = createMetaRuleset(type).finish();

             }

             _mapper.applyMetadata(ctx, instance);

         }

     }

 }