/*

  * 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()) &&

             !UILibrary.ALIAS_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);

             }

         }

     }

 }