/*
    * 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 javax.faces.component;
  
  import java.util.Iterator;
  import java.util.List;
  import java.util.Map;
  import java.util.NoSuchElementException;
  
  class _FacetsAndChildrenIterator implements Iterator<UIComponent>
  {
      private Iterator<UIComponent> _facetsIterator;
      private Iterator<UIComponent> _childrenIterator;
  
      _FacetsAndChildrenIterator(Map<String, UIComponent> facetMap, List<UIComponent> childrenList)
      {
          _facetsIterator = facetMap != null ? facetMap.values().iterator() : null;
          _childrenIterator = childrenList != null ? childrenList.iterator() : null;
      }
  
      @Override
      public boolean hasNext()
      {
          boolean hasNext = (_facetsIterator != null && _facetsIterator.hasNext())
                  || (_childrenIterator != null && _childrenIterator.hasNext());
          if (!hasNext)
          {
              _facetsIterator = null;
              _childrenIterator = null;
          }
          
          return hasNext;
      }
  
      @Override
      public UIComponent next()
      {
          if (_facetsIterator != null && _facetsIterator.hasNext())
          {
              return _facetsIterator.next();
          }
          else if (_childrenIterator != null && _childrenIterator.hasNext())
          {
              return _childrenIterator.next();
          }
          else
          {
              throw new NoSuchElementException();
          }
      }
  
      @Override
      public void remove()
      {
          throw new UnsupportedOperationException(this.getClass().getName() + " UnsupportedOperationException");
      }
  }