/*
    * 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);
     }
 }