/*
    * 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.pss.acid.component;
  
  import java.util.Random;
  import javax.faces.component.FacesComponent;
  import javax.faces.component.UIComponentBase;
  import javax.faces.component.UIOutput;
  import javax.faces.component.UIViewRoot;
  import javax.faces.context.FacesContext;
  import javax.faces.event.AbortProcessingException;
  import javax.faces.event.PreRenderViewEvent;
  import javax.faces.event.SystemEvent;
  import javax.faces.event.SystemEventListener;
  
  @FacesComponent(value = "com.myapp.UIDynamicFormComponent")
  public class UIDynamicFormComponent extends UIComponentBase implements
          SystemEventListener
  {
  
      //
      // Constructor
      //
  
      public UIDynamicFormComponent()
      {
  
          setRendererType("testcomponent");
  
          FacesContext context = FacesContext.getCurrentInstance();
          UIViewRoot root = context.getViewRoot();
  
          root.subscribeToViewEvent(PreRenderViewEvent.class, this);
      }
  
      //
      // Public methods
      //
  
      @Override
      public String getFamily()
      {
  
          return "com.myapp";
      }
  
      public boolean isListenerForSource(Object source)
      {
  
          return (source instanceof UIViewRoot);
      }
  
      public void processEvent(SystemEvent event) throws AbortProcessingException
      {
           // Clear the existing tree. 
          this.getChildren().clear();
          
          Integer index = (Integer) this.getAttributes().get("index");
          if (index == null)
          {
              index = 1;
          }
          else
          {
              index = index + 1;
          }
          this.getAttributes().put("index", index);
              
          // Start building the new component tree with formRoot as parent.
          Random random = new Random() ;
          int n = random.nextInt(9)+1;
  
          for(int i = 0; i < n; i++)
          {
              UIOutput input = new UIOutput();
              input.setId("input_"+index+"_"+i);
              this.getChildren().add(input);
          }
      }
  }