/*
    * 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.core;
  
  import java.io.IOException;
  import java.util.Map;
  import javax.el.ValueExpression;
  import javax.faces.component.UIComponent;
  import javax.faces.view.facelets.FaceletContext;
  import javax.faces.view.facelets.TagAttribute;
  import javax.faces.view.facelets.TagConfig;
  import javax.faces.view.facelets.TagException;
  import javax.faces.view.facelets.TagHandler;
  import org.apache.myfaces.buildtools.maven2.plugin.builder.annotation.JSFFaceletTag;
  
  /**
   *
   * @since 2.2
   * @author Leonardo Uribe
   */
  @JSFFaceletTag(
          name = "f:attributes",
          bodyContent = "empty")
  public final class AttributesHandler extends TagHandler 
  {
      private final TagAttribute _value;
      
      public AttributesHandler(TagConfig config)
      {
          super(config);
          _value = getRequiredAttribute("value");
      }
  
      public void apply(FaceletContext ctx, UIComponent parent) throws IOException
      {
          if (parent == null)
          {
              throw new TagException(this.tag, "Parent UIComponent was null");
          }
  
          // only process if the parent is new to the tree
          if (parent.getParent() == null)
          {
              Map<String, Object> map = (Map<String, Object>) _value.getObject(ctx, Map.class);
              Map<String, Object> attributesMap = parent.getAttributes();
              
              for (Map.Entry<String, Object> entry : map.entrySet())
              {
                  if (!attributesMap.containsKey(entry.getKey()))
                  {
                      if (entry.getValue() instanceof ValueExpression)
                      {
                          parent.setValueExpression(entry.getKey(), (ValueExpression) entry.getValue());
                      }
                      else
                      {
                          attributesMap.put(entry.getKey(), entry.getValue());
                      }
                  }
              }
          }
      }
  }