/*
    * 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.custom.calendar;
  
  import javax.faces.component.UIComponent;
  import javax.faces.view.facelets.ComponentConfig;
  import javax.faces.view.facelets.ComponentHandler;
  import javax.faces.view.facelets.FaceletContext;
  import javax.faces.view.facelets.MetaRule;
  import javax.faces.view.facelets.MetaRuleset;
  import javax.faces.view.facelets.Metadata;
  import javax.faces.view.facelets.MetadataTarget;
  import javax.faces.view.facelets.TagAttribute;
  
  import org.apache.myfaces.shared_tomahawk.util.ClassUtils;
  
  /**
   * 
   * @since 1.1.10
   * @author Leonardo Uribe (latest modification by $Author: lu4242 $)
   * @version $Revision: 691856 $ $Date: 2008-09-03 21:40:30 -0500 (mié, 03 sep 2008) $
   */
  public class HtmlInputCalendarTagHandler extends ComponentHandler
  {
  
      public HtmlInputCalendarTagHandler(ComponentConfig config)
      {
          super(config);
      }
  
      protected MetaRuleset createMetaRuleset(Class type)
      {
          MetaRuleset m = super.createMetaRuleset(type).alias("class", "styleClass");
  
          m.addRule(DateBusinessConverterRule.INSTANCE);
  
          return m;
      }
  
      public static class DateBusinessConverterRule extends MetaRule
      {
          public final static DateBusinessConverterRule INSTANCE = new DateBusinessConverterRule();
  
          final static class LiteralConverterMetadata extends Metadata
          {
  
              private final Class dateBusinessConverterClass;
  
              public LiteralConverterMetadata(String dateBusinessConverterClass)
              {
                  try
                  {
                      this.dateBusinessConverterClass = ClassUtils
                              .classForName(dateBusinessConverterClass);
                  }
                  catch(ClassNotFoundException e)
                  {
                      throw new IllegalArgumentException("Class referenced in calendarConverter not found: "+dateBusinessConverterClass);
                  }
                  catch(ClassCastException e)
                  {
                      throw new IllegalArgumentException("Class referenced in calendarConverter is not instance of org.apache.myfaces.custom.calendar.CalendarConverter: "+dateBusinessConverterClass);
                  }
              }
  
              public void applyMetadata(FaceletContext ctx, Object instance)
              {
                  ((AbstractHtmlInputCalendar) instance)
                          .setDateBusinessConverter((DateBusinessConverter) ClassUtils
                                  .newInstance(dateBusinessConverterClass));
              }
          }
  
          final static class DynamicConverterMetadata extends Metadata
          {
              private final TagAttribute attr;
  
              public DynamicConverterMetadata(TagAttribute attr)
              {
                  this.attr = attr;
              }
  
              public void applyMetadata(FaceletContext ctx, Object instance)
             {
                 ((UIComponent) instance).setValueExpression("dateBusinessConverter",
                         attr.getValueExpression(ctx,
                                 DateBusinessConverter.class));
             }
         }
 
         public Metadata applyRule(String name, TagAttribute attribute,
                 MetadataTarget meta)
         {
             if (meta.isTargetInstanceOf(AbstractHtmlInputCalendar.class))
             {
                 if ("dateBusinessConverter".equals(name)) {
                     if (attribute.isLiteral()) {
                         return new LiteralConverterMetadata(attribute.getValue());
                     } else {
                         return new DynamicConverterMetadata(attribute);
                     }
                 }
             }
             return null;
         }
     }
 }