/*

  * 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.ui;

 import java.io.IOException;

 import java.util.Collection;

 import java.util.HashMap;

 import java.util.Map;

 import java.util.logging.Level;

 import java.util.logging.Logger;

 import javax.el.ELException;

 import javax.faces.FacesException;

 import javax.faces.component.UIComponent;

 import javax.faces.view.facelets.FaceletContext;

 import javax.faces.view.facelets.FaceletException;

 import javax.faces.view.facelets.TagAttribute;

 import javax.faces.view.facelets.TagConfig;

 import javax.faces.view.facelets.TagHandler;

 import org.apache.myfaces.buildtools.maven2.plugin.builder.annotation.JSFFaceletAttribute;

 import org.apache.myfaces.buildtools.maven2.plugin.builder.annotation.JSFFaceletTag;

 import org.apache.myfaces.view.facelets.AbstractFaceletContext;

 import org.apache.myfaces.view.facelets.FaceletCompositionContext;

 import org.apache.myfaces.view.facelets.TemplateClient;

 import org.apache.myfaces.view.facelets.tag.TagHandlerUtils;

 /**

  * TODO: REFACTOR - This class could easily use a common parent with DecoratorHandler

  * 

  * @author Jacob Hookom

  * @version $Id$

  */

 @JSFFaceletTag(name="ui:composition")

 public final class CompositionHandler extends TagHandler implements TemplateClient

 {

     //private static final Logger log = Logger.getLogger("facelets.tag.ui.composition");

     private static final Logger log = Logger.getLogger(CompositionHandler.class.getName());

     public final static String NAME = "composition";

     /**

      * The resolvable URI of the template to use. The content within the composition tag will 

      * be used in populating the template specified.

      */

     @JSFFaceletAttribute(

             name="template",

             className="javax.el.ValueExpression",

             deferredValueType="java.lang.String")

     protected final TagAttribute _template;

     protected final Map<String, DefineHandler> _handlers;

     protected final ParamHandler[] _params;

     /**

      * @param config

      */

     public CompositionHandler(TagConfig config)

     {

         super(config);

         _template = getAttribute("template");

         if (_template != null)

         {

             _handlers = new HashMap<String, DefineHandler>();

             for (DefineHandler handler : TagHandlerUtils.findNextByType(nextHandler, DefineHandler.class))

             {

                 _handlers.put(handler.getName(), handler);

                 if (log.isLoggable(Level.FINE))

                 {

                     log.fine(tag + " found Define[" + handler.getName() + "]");

                 }

             }

             Collection<ParamHandler> params = TagHandlerUtils.findNextByType(nextHandler, ParamHandler.class);

             if (!params.isEmpty())

             {

                 int i = 0;

                 _params = new ParamHandler[params.size()];

                 for (ParamHandler handler : params)

                 {

                     _params[i++] = handler;

                 }

             }

             else

             {

                 _params = null;

             }

         }

         else

         {

             _params = null;

             _handlers = null;

         }

     }

     /*

      * (non-Javadoc)

      * 

      * @see javax.faces.view.facelets.FaceletHandler#apply(javax.faces.view.facelets.FaceletContext,

      * javax.faces.component.UIComponent)

      */

     public void apply(FaceletContext ctx, UIComponent parent) throws IOException, FacesException, FaceletException,

             ELException

     {

         if (_template != null)

         {

             //VariableMapper orig = ctx.getVariableMapper();

             //if (_params != null)

             //{

             //    VariableMapper vm = new VariableMapperWrapper(orig);

             //    ctx.setVariableMapper(vm);

             //    for (int i = 0; i < _params.length; i++)

             //    {

             //        _params[i].apply(ctx, parent);

             //    }

             //}

             AbstractFaceletContext actx = (AbstractFaceletContext) ctx;

             FaceletCompositionContext fcc = FaceletCompositionContext.getCurrentInstance(ctx);

             actx.extendClient(this);

             if (_params != null)

             {

                 String uniqueId = fcc.generateUniqueComponentId();

                 //VariableMapper vm = new VariableMapperWrapper(orig);

                 //ctx.setVariableMapper(vm);

                 for (int i = 0; i < _params.length; i++)

                 {

                     _params[i].apply(ctx, parent, _params[i].getName(ctx), _params[i].getValue(ctx), uniqueId);

                 }

             }

             try

             {

                 ctx.includeFacelet(parent, _template.getValue(ctx));

             }

             finally

             {

                 actx.popExtendedClient(this);

                 //ctx.setVariableMapper(orig);

             }

         }

         else

         {

             this.nextHandler.apply(ctx, parent);

         }

     }

     public boolean apply(FaceletContext ctx, UIComponent parent, String name) throws IOException, FacesException,

             FaceletException, ELException

     {

         if (name != null)

         {

             if (_handlers == null)

             {

                 return false;

             }

             DefineHandler handler = _handlers.get(name);

             if (handler != null)

             {

                 handler.applyDefinition(ctx, parent);

                 return true;

             }

             else

             {

                 return false;

             }

         }

         else

         {

             this.nextHandler.apply(ctx, parent);

             return true;

         }

     }

 }