/*
    * 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.composite;
  
  import java.io.Serializable;
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.List;
  
  import javax.el.ValueExpression;
  import javax.faces.component.UIComponent;
  import javax.faces.context.FacesContext;
  import javax.faces.view.AttachedObjectTarget;
  
  import org.apache.myfaces.shared.util.StringUtils;
  import org.apache.myfaces.view.facelets.tag.jsf.ComponentSupport;
  
  /**
   * 
   * @author Leonardo Uribe (latest modification by $Author$)
   * @version $Revision$ $Date$
   */
  public class AttachedObjectTargetImpl implements AttachedObjectTarget, Serializable
  {    
      /**
       * 
       */
      private static final long serialVersionUID = -7214478234269252354L;
      
      protected ValueExpression _name;
      
      protected ValueExpression _targets;
  
      public AttachedObjectTargetImpl()
      {
      }
  
      public String getName()
      {
          if (_name != null)
          {
              return (String) _name.getValue(FacesContext.getCurrentInstance().getELContext());
          }        
          return null;
      }
  
      public List<UIComponent> getTargets(UIComponent topLevelComponent)
      {
          FacesContext facesContext = FacesContext.getCurrentInstance();
          String [] targetsArray = getTargets(facesContext);
          
          if (targetsArray.length > 0)
          {
              List<UIComponent> targetsList = new ArrayList<UIComponent>(targetsArray.length);
              final char separatorChar = facesContext.getNamingContainerSeparatorChar();
              UIComponent facetBase = topLevelComponent.getFacet(UIComponent.COMPOSITE_FACET_NAME);
              for (String target : targetsArray)
              {
                  //UIComponent innerComponent = topLevelComponent.findComponent(
                  //        topLevelComponent.getId() + UINamingContainer.getSeparatorChar(facesContext) + target);
                  int separator = target.indexOf(separatorChar);
                  UIComponent innerComponent = null;
                  if (separator == -1)
                  {
                      innerComponent = ComponentSupport.findComponentChildOrFacetFrom(
                              facetBase, target, null);
                  }
                  else
                  {
                      innerComponent = ComponentSupport.findComponentChildOrFacetFrom(
                              facetBase, target.substring(0,separator), target);
                  }
                  
                  if (innerComponent != null)
                  {
                      targetsList.add(innerComponent);
                  }
              }
              return targetsList;
          }
          else
          {
              // composite:actionSource/valueHolder/editableValueHolder
             // "name" description says if targets is not set, name is 
             // the component id of the target component where
             // it should be mapped to
             String name = getName();
             if (name != null)
             {
                 //UIComponent innerComponent = topLevelComponent.findComponent(
                 //        topLevelComponent.getId() + UINamingContainer.getSeparatorChar(facesContext) + getName());
                 UIComponent innerComponent = ComponentSupport.findComponentChildOrFacetFrom(
                         topLevelComponent.getFacet(UIComponent.COMPOSITE_FACET_NAME),
                         name, null);
                 if (innerComponent != null)
                 {
                     List<UIComponent> targetsList = new ArrayList<UIComponent>(1);
                     targetsList.add(innerComponent);
                     return targetsList;
                 }
             }
             return Collections.emptyList();
         }
     }
     
     public String [] getTargets(FacesContext context)
     {
         if (_targets != null)
         {
             return StringUtils.splitShortString((String) _targets.getValue(context.getELContext()), ' ');
         }
         return org.apache.myfaces.shared.util.ArrayUtils.EMPTY_STRING_ARRAY;
     }
     
     public void setName(ValueExpression ve)
     {
         _name = ve;
     }
     
     public void setTargets(ValueExpression ve)
     {
         _targets = ve;
     }
 }