/*

  * 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 javax.el.ELException;

 import javax.el.ValueExpression;

 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.util.ExternalSpecifications;

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

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

 import org.apache.myfaces.view.facelets.el.FaceletStateValueExpression;

 import org.apache.myfaces.view.facelets.el.FaceletStateValueExpressionUEL;

 import org.apache.myfaces.view.facelets.tag.jsf.ComponentSupport;

 import org.apache.myfaces.view.facelets.tag.jsf.FaceletState;

 /**

  * @author Jacob Hookom

  * @version $Id$

  */

 @JSFFaceletTag(name="ui:param")

 public class ParamHandler extends TagHandler

 {

     /**

      * The name of the variable to pass to the included Facelet.

      */

     @JSFFaceletAttribute(

             className="javax.el.ValueExpression",

             deferredValueType="java.lang.String",

             required=true)

     private final TagAttribute name;

     /**

      * The literal or EL expression value to assign to the named variable.

      */

     @JSFFaceletAttribute(

             className="javax.el.ValueExpression",

             deferredValueType="java.lang.String",

             required=true)

     private final TagAttribute value;

     /**

      * @param config

      */

     public ParamHandler(TagConfig config)

     {

         super(config);

         this.name = this.getRequiredAttribute("name");

         this.value = this.getRequiredAttribute("value");

     }

     /*

      * (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

     {

         String nameStr = getName(ctx);

         ValueExpression valueVE = getValue(ctx);

         //ctx.getVariableMapper().setVariable(nameStr, valueVE);

         apply(ctx, parent, nameStr, valueVE);

     }

     public void apply(FaceletContext ctx, UIComponent parent, String nameStr, ValueExpression valueVE)

             throws IOException, FacesException, FaceletException, ELException

     {

         AbstractFaceletContext actx = ((AbstractFaceletContext) ctx);

         actx.getTemplateContext().setParameter(nameStr, valueVE);

         if (actx.getTemplateContext().isAllowCacheELExpressions())

         {

             if (ELExpressionCacheMode.strict.equals(actx.getELExpressionCacheMode()) ||

                 ELExpressionCacheMode.allowCset.equals(actx.getELExpressionCacheMode()))

             {

                 actx.getTemplateContext().setAllowCacheELExpressions(false);

             }

         }

     }

     public void apply(FaceletContext ctx, UIComponent parent, String nameStr, ValueExpression valueVE,

         String uniqueId)

             throws IOException, FacesException, FaceletException, ELException

     {

         AbstractFaceletContext actx = ((AbstractFaceletContext) ctx);

         if (ELExpressionCacheMode.alwaysRecompile.equals(actx.getELExpressionCacheMode()))

         {

             FaceletState faceletState = ComponentSupport.getFaceletState(ctx, parent, true);

             faceletState.putBinding(uniqueId, nameStr, valueVE);

             ValueExpression ve;

             if (ExternalSpecifications.isUnifiedELAvailable())

             {

                 ve = new FaceletStateValueExpressionUEL(uniqueId, nameStr);

             }

             else

             {

                 ve = new FaceletStateValueExpression(uniqueId, nameStr);

             }

             actx.getTemplateContext().setParameter(nameStr, ve);

         }

         else

         {

             actx.getTemplateContext().setParameter(nameStr, valueVE);

         }

         if (actx.getTemplateContext().isAllowCacheELExpressions())

         {

             if (ELExpressionCacheMode.strict.equals(actx.getELExpressionCacheMode()) ||

                 ELExpressionCacheMode.allowCset.equals(actx.getELExpressionCacheMode()))

             {

                 actx.getTemplateContext().setAllowCacheELExpressions(false);

             }

         }

     }

     public String getName(FaceletContext ctx)

     {

         return this.name.getValue(ctx);

     }

     public ValueExpression getValue(FaceletContext ctx)

     {

         return this.value.getValueExpression(ctx, Object.class);

     }

 }