/*
    * 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.beans.Introspector;
  import java.beans.PropertyDescriptor;
  import java.util.HashSet;
  import java.util.Map;
  import java.util.Set;
  
  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.MetaRuleset;
  import javax.faces.view.facelets.Metadata;
  import javax.faces.view.facelets.TagAttribute;
  
  /**
   * Facelet alternative to c:forEach or h:dataTable
   *
   */
  public class RepeatHandler extends ComponentHandler
  {
      
      public RepeatHandler(ComponentConfig config)
      {
          super(config);
      }
  
      protected MetaRuleset createMetaRuleset(Class type)
      {
          MetaRuleset meta = super.createMetaRuleset(type);
  
          if (!UILibrary.Namespace.equals(this.tag.getNamespace()))
          {
              meta.add(new TagMetaData(type));
          }
  
          meta.alias("class", "styleClass");
  
          return meta;
      }
  
      private class TagMetaData extends Metadata
      {
          private final String[] _attrs;
  
          public TagMetaData(Class<?> type)
          {
              Set<String> names = new HashSet<String>();
              for (TagAttribute attribute : tag.getAttributes().getAll())
              {
                  if ("class".equals(attribute.getLocalName()))
                  {
                      names.add("styleClass");
                  }
                  else
                  {
                      names.add(attribute.getLocalName());
                  }
              }
              
              try
              {
                  for (PropertyDescriptor descriptor : Introspector.getBeanInfo(type).getPropertyDescriptors())
                  {
                      if (descriptor.getWriteMethod() != null)
                      {
                          names.remove(descriptor.getName());
                      }
                  }
              }
              catch (Exception e)
              {
                  // do nothing
              }
              
              _attrs = names.toArray(new String[names.size()]);
          }
  
          public void applyMetadata(FaceletContext ctx, Object instance)
          {
             UIComponent component = (UIComponent) instance;
             Map<String, Object> attrs = component.getAttributes();
             attrs.put("alias.element", tag.getQName());
             if (_attrs.length > 0)
             {
                 attrs.put("alias.attributes", _attrs);
             }
         }
     }
 }