/*

  * 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.jsf;

 import javax.faces.component.UIComponent;

 import javax.faces.component.ValueHolder;

 import javax.faces.convert.Converter;

 import javax.faces.view.facelets.FaceletContext;

 import javax.faces.view.facelets.MetaRule;

 import javax.faces.view.facelets.Metadata;

 import javax.faces.view.facelets.MetadataTarget;

 import javax.faces.view.facelets.TagAttribute;

 /**

  * 

  * @author Jacob Hookom

  * @version $Id$

  */

 public final class ValueHolderRule extends MetaRule

 {

     final static class LiteralConverterMetadata extends Metadata

     {

         private final String converterId;

         public LiteralConverterMetadata(String converterId)

         {

             this.converterId = converterId;

         }

         public void applyMetadata(FaceletContext ctx, Object instance)

         {

             ((ValueHolder) instance).setConverter(ctx.getFacesContext().getApplication()

                     .createConverter(this.converterId));

         }

     }

     final static class DynamicConverterMetadata2 extends Metadata

     {

         private final TagAttribute attr;

         public DynamicConverterMetadata2(TagAttribute attr)

         {

             this.attr = attr;

         }

         public void applyMetadata(FaceletContext ctx, Object instance)

         {

             ((UIComponent) instance).setValueExpression("converter", attr.getValueExpression(ctx, Converter.class));

         }

     }

     final static class LiteralValueMetadata extends Metadata

     {

         private final String value;

         public LiteralValueMetadata(String value)

         {

             this.value = value;

         }

         public void applyMetadata(FaceletContext ctx, Object instance)

         {

             ((ValueHolder) instance).setValue(this.value);

         }

     }

     final static class DynamicValueExpressionMetadata extends Metadata

     {

         private final TagAttribute attr;

         public DynamicValueExpressionMetadata(TagAttribute attr)

         {

             this.attr = attr;

         }

         public void applyMetadata(FaceletContext ctx, Object instance)

         {

             ((UIComponent) instance).setValueExpression("value", attr.getValueExpression(ctx, Object.class));

         }

     }

     public final static ValueHolderRule INSTANCE = new ValueHolderRule();

     public Metadata applyRule(String name, TagAttribute attribute, MetadataTarget meta)

     {

         if (meta.isTargetInstanceOf(ValueHolder.class))

         {

             if ("converter".equals(name))

             {

                 if (attribute.isLiteral())

                 {

                     return new LiteralConverterMetadata(attribute.getValue());

                 }

                 else

                 {

                     return new DynamicConverterMetadata2(attribute);

                 }

             }

             if ("value".equals(name))

             {

                 if (attribute.isLiteral())

                 {

                     return new LiteralValueMetadata(attribute.getValue());

                 }

                 else

                 {

                     return new DynamicValueExpressionMetadata(attribute);

                 }

             }

         }

         return null;

     }

 }