package org.djutils.immutablecollections;
   
   import java.util.Collection;
   import java.util.List;
   import java.util.RandomAccess;
   import java.util.Spliterator;
   import java.util.function.Consumer;
   import java.util.stream.Stream;
   
  import org.djutils.exceptions.Throw;
  
  /**
   * An abstract base class for an immutable wrapper for a List.
   * <p>
   * Copyright (c) 2016-2019 Delft University of Technology, Jaffalaan 5, 2628 BX Delft, the Netherlands. All rights reserved. See
   * for project information <a href="https://djutils.org" target="_blank"> https://djutils.org</a>. The DJUTILS project is
   * distributed under a three-clause BSD-style license, which can be found at
   * <a href="https://djutils.org/docs/license.html" target="_blank"> https://djutils.org/docs/license.html</a>.
   * </p>
   * @author <a href="https://www.tudelft.nl/averbraeck">Alexander Verbraeck</a>
   * @author <a href="http://www.tudelft.nl/pknoppers">Peter Knoppers</a>
   * @author <a href="http://www.transport.citg.tudelft.nl">Wouter Schakel</a>
   * @param <E> the type of content of this List
   */
  public abstract class ImmutableAbstractList<E> extends ImmutableAbstractCollection<E>
          implements ImmutableList<E>, RandomAccess
  {
      /** */
      private static final long serialVersionUID = 20160507L;
  
      /** the list that is wrapped, without giving access to methods that can change it. */
      private final List<E> list;
  
      /**
       * Construct an abstract immutable list. Make sure that the argument is a safe copy of the list or pointer to the
       * list of the right type! Copying does not take place in the Abstract class!
       * @param list List&lt;E&gt;; a safe copy of the list, or pointer to the list to use for the immutable list
       * @param copyOrWrap Immutable; indicate whether the immutable is a copy or a wrap
       */
      protected ImmutableAbstractList(final List<E> list, final Immutable copyOrWrap)
      {
          super(copyOrWrap);
          Throw.whenNull(list, "the list argument cannot be null");
          this.list = list;
      }
  
      /** {@inheritDoc} */
      @Override
      public final Collection<E> toCollection()
      {
          return toList();
      }
  
      /** {@inheritDoc} */
      @Override
      protected List<E> getCollection()
      {
          return this.list;
      }
  
      /** {@inheritDoc} */
      @Override
      public final int size()
      {
          return this.list.size();
      }
  
      /** {@inheritDoc} */
      @Override
      public final boolean isEmpty()
      {
          return this.list.isEmpty();
      }
  
      /** {@inheritDoc} */
      @Override
      public final boolean contains(final Object o)
      {
          return this.list.contains(o);
      }
  
      /** {@inheritDoc} */
      @Override
      public final int indexOf(final Object o)
      {
          return this.list.indexOf(o);
      }
  
      /** {@inheritDoc} */
      @Override
      public final int lastIndexOf(final Object o)
      {
          return this.list.lastIndexOf(o);
      }
  
      /** {@inheritDoc} */
      @Override
      public final Object[] toArray()
      {
         return this.list.toArray();
     }
 
     /** {@inheritDoc} */
     @Override
     public final <T> T[] toArray(final T[] a)
     {
         return this.list.toArray(a);
     }
 
     /** {@inheritDoc} */
     @Override
     public final E get(final int index)
     {
         return this.list.get(index);
     }
 
     /** {@inheritDoc} */
     @Override
     public final ImmutableIterator<E> iterator()
     {
         return new ImmutableIterator<E>(this.list.iterator());
     }
 
     /** {@inheritDoc} */
     @Override
     public final void forEach(final Consumer<? super E> action)
     {
         this.list.forEach(action);
     }
 
     /** {@inheritDoc} */
     @Override
     public final Spliterator<E> spliterator()
     {
         return this.list.spliterator();
     }
 
     /** {@inheritDoc} */
     @Override
     public final boolean containsAll(final Collection<?> c)
     {
         return this.list.containsAll(c);
     }
 
     /** {@inheritDoc} */
     @Override
     public final boolean containsAll(final ImmutableCollection<?> c)
     {
         return this.list.containsAll(c.toCollection());
     }
 
     /** {@inheritDoc} */
     @Override
     public final Stream<E> stream()
     {
         return this.list.stream();
     }
 
     /** {@inheritDoc} */
     @Override
     public final Stream<E> parallelStream()
     {
         return this.list.parallelStream();
     }
 
     /** {@inheritDoc} */
     @Override
     public final boolean isWrap()
     {
         return this.copyOrWrap.isWrap();
     }
 
     /** {@inheritDoc} */
     @Override
     @SuppressWarnings("checkstyle:designforextension")
     public int hashCode()
     {
         final int prime = 31;
         int result = 1;
         result = prime * result + ((this.list == null) ? 0 : this.list.hashCode());
         return result;
     }
 
     /** {@inheritDoc} */
     @Override
     @SuppressWarnings({"checkstyle:designforextension", "checkstyle:needbraces"})
     public boolean equals(final Object obj)
     {
         if (this == obj)
             return true;
         if (obj == null)
             return false;
         if (getClass() != obj.getClass())
             return false;
         ImmutableAbstractList<?> other = (ImmutableAbstractList<?>) obj;
         if (this.list == null)
         {
             if (other.list != null)
                 return false;
         }
         else if (!this.list.equals(other.list))
             return false;
         return true;
     }
 
     /** {@inheritDoc} */
     @Override
     @SuppressWarnings("checkstyle:designforextension")
     public String toString()
     {
         return "Immutable[" + this.list.toString() + "]";
     }
 }