package org.opentrafficsim.core.immutablecollections;
   
   import java.util.Comparator;
   import java.util.EnumSet;
   import java.util.NavigableSet;
   import java.util.SortedSet;
   import java.util.TreeSet;
   
   /**
   * An immutable wrapper for a TreeSet.
   * <p>
   * Copyright (c) 2013-2016 Delft University of Technology, PO Box 5, 2600 AA, Delft, the Netherlands. All rights reserved. <br>
   * BSD-style license. See <a href="http://opentrafficsim.org/docs/license.html">OpenTrafficSim License</a>.
   * </p>
   * $LastChangedDate: 2015-07-24 02:58:59 +0200 (Fri, 24 Jul 2015) $, @version $Revision: 1147 $, by $Author: averbraeck $,
   * initial version May 7, 2016 <br>
   * @author <a href="http://www.tbm.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 Set
   */
  public class ImmutableTreeSet<E> extends ImmutableAbstractSet<E> implements ImmutableNavigableSet<E>
  {
      /** */
      private static final long serialVersionUID = 20160507L;
  
      /**
       * @param sortedSet the set to use as the immutable set.
       */
      public ImmutableTreeSet(final SortedSet<E> sortedSet)
      {
          super(new TreeSet<E>(sortedSet));
      }
  
      /**
       * @param sortedSet the set to use as the immutable set.
       */
      public ImmutableTreeSet(final ImmutableSortedSet<E> sortedSet)
      {
          this(sortedSet.toSet());
      }
  
      /** {@inheritDoc} */
      @Override
      protected final NavigableSet<E> getSet()
      {
          return (NavigableSet<E>) super.getSet();
      }
  
      /** {@inheritDoc} */
      @Override
      public final NavigableSet<E> toSet()
      {
          return new TreeSet<E>(super.getSet());
      }
  
      /** {@inheritDoc} */
      @Override
      public final Comparator<? super E> comparator()
      {
          return getSet().comparator();
      }
  
      /** {@inheritDoc} */
      @Override
      public final ImmutableSortedSet<E> subSet(final E fromElement, final E toElement)
      {
          return new ImmutableTreeSet<E>(getSet().subSet(fromElement, toElement));
      }
  
      /** {@inheritDoc} */
      @Override
      public final ImmutableSortedSet<E> headSet(final E toElement)
      {
          return new ImmutableTreeSet<E>(getSet().headSet(toElement));
      }
  
      /** {@inheritDoc} */
      @Override
      public final ImmutableSortedSet<E> tailSet(final E fromElement)
      {
          return new ImmutableTreeSet<E>(getSet().tailSet(fromElement));
      }
  
      /** {@inheritDoc} */
      @Override
      public final E first()
      {
          return getSet().first();
      }
  
      /** {@inheritDoc} */
      @Override
      public final E last()
      {
          return getSet().last();
      }
  
      /** {@inheritDoc} */
     @Override
     public final E lower(final E e)
     {
         return getSet().lower(e);
     }
 
     /** {@inheritDoc} */
     @Override
     public final E floor(final E e)
     {
         return getSet().floor(e);
     }
 
     /** {@inheritDoc} */
     @Override
     public final E ceiling(final E e)
     {
         return getSet().ceiling(e);
     }
 
     /** {@inheritDoc} */
     @Override
     public final E higher(final E e)
     {
         return getSet().higher(e);
     }
 
     /** {@inheritDoc} */
     @Override
     public final ImmutableNavigableSet<E> descendingSet()
     {
         return new ImmutableTreeSet<E>(getSet().descendingSet());
     }
 
     /** {@inheritDoc} */
     @Override
     public final ImmutableIterator<E> descendingIterator()
     {
         return new ImmutableIterator<E>(getSet().descendingIterator());
     }
 
     /** {@inheritDoc} */
     @Override
     public final ImmutableNavigableSet<E> subSet(final E fromElement, final boolean fromInclusive, final E toElement,
             final boolean toInclusive)
     {
         return new ImmutableTreeSet<E>(getSet().subSet(fromElement, fromInclusive, toElement, toInclusive));
     }
 
     /** {@inheritDoc} */
     @Override
     public final ImmutableNavigableSet<E> headSet(final E toElement, final boolean inclusive)
     {
         return new ImmutableTreeSet<E>(getSet().headSet(toElement, inclusive));
     }
 
     /** {@inheritDoc} */
     @Override
     public final ImmutableNavigableSet<E> tailSet(final E fromElement, final boolean inclusive)
     {
         return new ImmutableTreeSet<E>(getSet().tailSet(fromElement, inclusive));
     }
 
     /** {@inheritDoc} */
     @Override
     public final String toString()
     {
         NavigableSet<E> set = getSet();
         if (null == set)
         {
             return "ImmutableTreeSet []";
         }
         return "ImmutableTreeSet [" + set.toString() + "]";
     }
 
 }