/*
    * 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.compiler;
  
  import java.io.IOException;
  import java.util.ArrayList;
  import java.util.List;
  
  import javax.el.ELException;
  import javax.faces.FacesException;
  import javax.faces.component.UIComponent;
  import javax.faces.view.facelets.FaceletContext;
  import javax.faces.view.facelets.FaceletException;
  import javax.faces.view.facelets.FaceletHandler;
  
  /**
   * 
   * @author Jacob Hookom
   * @version $Id$
   */
  class CompilationUnit
  {
  
      protected final static FaceletHandler LEAF = new FaceletHandler()
      {
          public void apply(FaceletContext ctx, UIComponent parent) throws IOException, FacesException, FaceletException,
                  ELException
          {
          }
  
          public String toString()
          {
              return "FaceletHandler Tail";
          }
      };
  
      private List<CompilationUnit> children;
  
      public CompilationUnit()
      {
      }
  
      public void addChild(CompilationUnit unit)
      {
          if (this.children == null)
          {
              this.children = new ArrayList<CompilationUnit>();
          }
          this.children.add(unit);
      }
  
      public FaceletHandler createFaceletHandler()
      {
          return this.getNextFaceletHandler();
      }
  
      protected final FaceletHandler getNextFaceletHandler()
      {
          if (this.children == null || this.children.size() == 0)
          {
              return LEAF;
          }
          if (this.children.size() == 1)
          {
              CompilationUnit u = (CompilationUnit) this.children.get(0);
              return u.createFaceletHandler();
          }
          FaceletHandler[] fh = new FaceletHandler[this.children.size()];
          for (int i = 0; i < fh.length; i++)
          {
              fh[i] = ((CompilationUnit) this.children.get(i)).createFaceletHandler();
          }
          return new javax.faces.view.facelets.CompositeFaceletHandler(fh);
      }
  
  }