/*
    * 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 org.apache.commons.collections.Predicate;
  import org.apache.commons.collections.collection.PredicatedCollection;
  import org.apache.commons.collections.iterators.AbstractListIteratorDecorator;
  
  import java.util.Collection;
  import java.util.List;
  import java.util.ListIterator;
  
  /**
   * Decorates another <code>List</code> to validate that all additions
   * match a specified predicate.
   * <p>
   * This list exists to provide validation for the decorated list.
   * It is normally created to decorate an empty list.
   * If an object cannot be added to the list, an IllegalArgumentException is thrown.
   * <p>
   * One usage would be to ensure that no null entries are added to the list.
   * <pre>List list = PredicatedList.decorate(new ArrayList(), NotNullPredicate.INSTANCE);</pre>
   * <p>
   * This class is Serializable from Commons Collections 3.1.
   *
   * @since 3.0
   * @version $Id: PredicatedList.java 1429905 2013-01-07 17:15:14Z ggregory $
   */
  public class PredicatedList<E> extends PredicatedCollection<E> implements List<E> {
  
      /** Serialization version */
      private static final long serialVersionUID = -5722039223898659102L;
  
      /**
       * Factory method to create a predicated (validating) list.
       * <p>
       * If there are any elements already in the list being decorated, they
       * are validated.
       * 
       * @param <T> the type of the elements in the list
       * @param list  the list to decorate, must not be null
       * @param predicate  the predicate to use for validation, must not be null
       * @return a new predicated list
       * @throws IllegalArgumentException if list or predicate is null
       * @throws IllegalArgumentException if the list contains invalid elements
       */
      public static <T> PredicatedList<T> predicatedList(final List<T> list, final Predicate<? super T> predicate) {
          return new PredicatedList<T>(list, predicate);
      }
  
      //-----------------------------------------------------------------------
      /**
       * Constructor that wraps (not copies).
       * <p>
       * If there are any elements already in the list being decorated, they
       * are validated.
       * 
       * @param list  the list to decorate, must not be null
       * @param predicate  the predicate to use for validation, must not be null
       * @throws IllegalArgumentException if list or predicate is null
       * @throws IllegalArgumentException if the list contains invalid elements
       */
      protected PredicatedList(final List<E> list, final Predicate<? super E> predicate) {
          super(list, predicate);
      }
  
      /**
       * Gets the list being decorated.
       * 
       * @return the decorated list
       */
      @Override
      protected List<E> decorated() {
          return (List<E>) super.decorated();
      }
  
      //-----------------------------------------------------------------------
      
      public E get(final int index) {
          return decorated().get(index);
      }
  
      public int indexOf(final Object object) {
          return decorated().indexOf(object);
      }
 
     public int lastIndexOf(final Object object) {
         return decorated().lastIndexOf(object);
     }
 
     public E remove(final int index) {
         return decorated().remove(index);
     }
 
     //-----------------------------------------------------------------------
     
     public void add(final int index, final E object) {
         validate(object);
         decorated().add(index, object);
     }
 
     public boolean addAll(final int index, final Collection<? extends E> coll) {
         for (final E aColl : coll) {
             validate(aColl);
         }
         return decorated().addAll(index, coll);
     }
 
     public ListIterator<E> listIterator() {
         return listIterator(0);
     }
 
     public ListIterator<E> listIterator(final int i) {
         return new PredicatedListIterator(decorated().listIterator(i));
     }
 
     public E set(final int index, final E object) {
         validate(object);
         return decorated().set(index, object);
     }
 
     public List<E> subList(final int fromIndex, final int toIndex) {
         final List<E> sub = decorated().subList(fromIndex, toIndex);
         return new PredicatedList<E>(sub, predicate);
     }
 
     /**
      * Inner class Iterator for the PredicatedList
      */
     protected class PredicatedListIterator extends AbstractListIteratorDecorator<E> {
         
         /**
          * Create a new predicated list iterator.
          * 
          * @param iterator  the list iterator to decorate
          */
         protected PredicatedListIterator(final ListIterator<E> iterator) {
             super(iterator);
         }
         
         @Override
         public void add(final E object) {
             validate(object);
             iterator.add(object);
         }
         
         @Override
         public void set(final E object) {
             validate(object);
             iterator.set(object);
         }
     }
 
 }