/*
    * 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.commons.collections.list;
  
  import java.util.Collection;
  import java.util.Iterator;
  import java.util.List;
  import java.util.ListIterator;
  
  import org.apache.commons.collections.BoundedCollection;
  import org.apache.commons.collections.iterators.AbstractListIteratorDecorator;
  import org.apache.commons.collections.iterators.UnmodifiableIterator;
  
  /**
   * Decorates another <code>List</code> to fix the size preventing add/remove.
   * <p>
   * The add, remove, clear and retain operations are unsupported.
   * The set method is allowed (as it doesn't change the list size).
   * <p>
   * This class is Serializable from Commons Collections 3.1.
   *
   * @since 3.0
   * @version $Id: FixedSizeList.java 1429905 2013-01-07 17:15:14Z ggregory $
   */
  public class FixedSizeList<E>
          extends AbstractSerializableListDecorator<E>
          implements BoundedCollection<E> {
  
      /** Serialization version */
      private static final long serialVersionUID = -2218010673611160319L;
  
      /**
       * Factory method to create a fixed size list.
       * 
       * @param <E> the type of the elements in the list
       * @param list  the list to decorate, must not be null
       * @return a new fixed size list
       * @throws IllegalArgumentException if list is null
       */
      public static <E> FixedSizeList<E> fixedSizeList(final List<E> list) {
          return new FixedSizeList<E>(list);
      }
  
      //-----------------------------------------------------------------------
      /**
       * Constructor that wraps (not copies).
       * 
       * @param list  the list to decorate, must not be null
       * @throws IllegalArgumentException if list is null
       */
      protected FixedSizeList(final List<E> list) {
          super(list);
      }
  
      //-----------------------------------------------------------------------
      @Override
      public boolean add(final E object) {
          throw new UnsupportedOperationException("List is fixed size");
      }
  
      @Override
      public void add(final int index, final E object) {
          throw new UnsupportedOperationException("List is fixed size");
      }
  
      @Override
      public boolean addAll(final Collection<? extends E> coll) {
          throw new UnsupportedOperationException("List is fixed size");
      }
  
      @Override
      public boolean addAll(final int index, final Collection<? extends E> coll) {
          throw new UnsupportedOperationException("List is fixed size");
      }
  
      @Override
      public void clear() {
          throw new UnsupportedOperationException("List is fixed size");
      }
  
      @Override
      public E get(final int index) {
          return decorated().get(index);
      }
  
     @Override
     public int indexOf(final Object object) {
         return decorated().indexOf(object);
     }
 
     @Override
     public Iterator<E> iterator() {
         return UnmodifiableIterator.unmodifiableIterator(decorated().iterator());
     }
 
     @Override
     public int lastIndexOf(final Object object) {
         return decorated().lastIndexOf(object);
     }
 
     @Override
     public ListIterator<E> listIterator() {
         return new FixedSizeListIterator(decorated().listIterator(0));
     }
 
     @Override
     public ListIterator<E> listIterator(final int index) {
         return new FixedSizeListIterator(decorated().listIterator(index));
     }
 
     @Override
     public E remove(final int index) {
         throw new UnsupportedOperationException("List is fixed size");
     }
 
     @Override
     public boolean remove(final Object object) {
         throw new UnsupportedOperationException("List is fixed size");
     }
 
     @Override
     public boolean removeAll(final Collection<?> coll) {
         throw new UnsupportedOperationException("List is fixed size");
     }
 
     @Override
     public boolean retainAll(final Collection<?> coll) {
         throw new UnsupportedOperationException("List is fixed size");
     }
 
     @Override
     public E set(final int index, final E object) {
         return decorated().set(index, object);
     }
 
     @Override
     public List<E> subList(final int fromIndex, final int toIndex) {
         final List<E> sub = decorated().subList(fromIndex, toIndex);
         return new FixedSizeList<E>(sub);
     }
 
     /**
      * List iterator that only permits changes via set()
      */
     private class FixedSizeListIterator extends AbstractListIteratorDecorator<E> {
         protected FixedSizeListIterator(final ListIterator<E> iterator) {
             super(iterator);
         }
         @Override
         public void remove() {
             throw new UnsupportedOperationException("List is fixed size");
         }
         @Override
         public void add(final Object object) {
             throw new UnsupportedOperationException("List is fixed size");
         }
     }
 
     public boolean isFull() {
         return true;
     }
 
     public int maxSize() {
         return size();
     }
 
 }