/*
    * 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.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;
  import org.apache.myfaces.view.facelets.PassthroughRule;
  
  /**
   *
   * @author Leonardo Uribe
   */
  final class PassthroughRuleImpl extends MetaRule implements PassthroughRule
  {
  
      final static class LiteralAttributeMetadata extends Metadata
      {
          private final String _name;
          private final String _value;
  
          public LiteralAttributeMetadata(String name, String value)
          {
              _name = name;
              _value = value;
          }
  
          public void applyMetadata(FaceletContext ctx, Object instance)
          {
              ((UIComponent) instance).getPassThroughAttributes().put(_name, _value);
          }
      }
  
      final static class ValueExpressionMetadata extends Metadata
      {
          private final String _name;
  
          private final TagAttribute _attr;
  
          private final Class<?> _type;
  
          public ValueExpressionMetadata(String name, Class<?> type, TagAttribute attr)
          {
              _name = name;
              _attr = attr;
              _type = type;
          }
  
          public void applyMetadata(FaceletContext ctx, Object instance)
          {
              ((UIComponent) instance).getPassThroughAttributes().put(
                  _name, _attr.getValueExpression(ctx, _type));
          }
      }
  
      public final static PassthroughRuleImpl INSTANCE = new PassthroughRuleImpl();
  
      public PassthroughRuleImpl()
      {
          super();
      }
  
      public Metadata applyRule(String name, TagAttribute attribute, MetadataTarget meta)
      {
          if (meta.isTargetInstanceOf(UIComponent.class))
          {
              // if component and dynamic, then must set expression
              if (!attribute.isLiteral())
              {
                  Class<?> type = meta.getPropertyType(name);
                  if (type == null)
                  {
                      type = Object.class;
                  }
                  // if "class" is used, set type as Object (do not confuse with getClass()). 
                  if ("class".equalsIgnoreCase(name))
                  {
                      type = Object.class;
                  }
                  
                 return new ValueExpressionMetadata(name, type, attribute);
             }
             else
             {
                 return new LiteralAttributeMetadata(name, attribute.getValue());
             }
         }
         return null;
     }
 }