/*
    * 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.commons.outputClientId;
  
  import java.io.IOException;
  
  import javax.faces.component.UIComponent;
  import javax.faces.component.UIComponentBase;
  import javax.faces.context.FacesContext;
  
  import org.apache.myfaces.buildtools.maven2.plugin.builder.annotation.JSFComponent;
  import org.apache.myfaces.buildtools.maven2.plugin.builder.annotation.JSFProperty;
  
  /**
   * Output the clientId of a component specified by for property.
   * 
   * @author Leonardo Uribe
   * @since 1.0.1
   */
  @JSFComponent(
          name = "mc:outputClientId",
          clazz = "org.apache.myfaces.commons.outputClientId.OutputClientId",
          tagClass = "org.apache.myfaces.commons.outputClientId.OutputClientIdTag")
  public abstract class AbstractOutputClientId extends UIComponentBase
  {
      public static final String COMPONENT_FAMILY = "javax.faces.Output";
      public static final String COMPONENT_TYPE = "org.apache.myfaces.commons.OutputClientId";
  
      /**
       * The ID of the component that should be rendered.
       * 
       * @return
       */
      @JSFProperty
      public abstract String getFor();
  
      @Override
      public void encodeBegin(FacesContext context) throws IOException
      {
          super.encodeBegin(context);
  
          String forId = getFor();
          UIComponent referencedComponent = null;
  
          if (forId == null)
          {
              referencedComponent = getParent();
          }
          else
          {
              referencedComponent = this.findComponent(forId);
          }
  
          if (referencedComponent == null)
          {
              throw new IllegalStateException("No component found for id : "
                      + forId);
          }
  
          context.getResponseWriter().write(
                  referencedComponent.getClientId(context));
      }
  }