package org.djutils.immutablecollections;
   
   import java.util.Collection;
   import java.util.Comparator;
   import java.util.NavigableSet;
   import java.util.TreeSet;
   
   /**
    * An immutable wrapper for a TreeSet.
   * <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="https://www.tudelft.nl/staff/p.knoppers/">Peter Knoppers</a>
   * @author <a href="https://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 Collection&lt;? extends E&gt;; the collection to use for the immutable set.
       */
      public ImmutableTreeSet(final Collection<? extends E> sortedSet)
      {
          super(new TreeSet<E>(sortedSet), Immutable.COPY);
      }
  
      /**
       * @param treeSet NavigableSet&lt;E&gt;; the collection to use for the immutable set.
       * @param copyOrWrap COPY stores a safe, internal copy of the collection; WRAP stores a pointer to the original collection
       */
      public ImmutableTreeSet(final NavigableSet<E> treeSet, final Immutable copyOrWrap)
      {
          super(copyOrWrap == Immutable.COPY ? new TreeSet<E>(treeSet) : treeSet, copyOrWrap);
      }
  
      /**
       * @param immutableSortedSet ImmutableAbstractSet&lt;E&gt;; the collection to use for the immutable set.
       */
      public ImmutableTreeSet(final ImmutableAbstractSet<E> immutableSortedSet)
      {
          super(new TreeSet<E>(immutableSortedSet.getCollection()), Immutable.COPY);
      }
  
      /**
       * @param immutableTreeSet ImmutableTreeSet&lt;E&gt;; the collection to use for the immutable set.
       * @param copyOrWrap COPY stores a safe, internal copy of the collection; WRAP stores a pointer to the original collection
       */
      public ImmutableTreeSet(final ImmutableTreeSet<E> immutableTreeSet, final Immutable copyOrWrap)
      {
          super(copyOrWrap == Immutable.COPY ? new TreeSet<E>(immutableTreeSet.getCollection())
                  : immutableTreeSet.getCollection(), copyOrWrap);
      }
  
      /** {@inheritDoc} */
      @Override
      public final NavigableSet<E> toSet()
      {
          return new TreeSet<E>(getCollection());
      }
  
      /** {@inheritDoc} */
      @Override
      protected NavigableSet<E> getCollection()
      {
          return (NavigableSet<E>) super.getCollection();
      }
  
      /** {@inheritDoc} */
      @Override
      public final Comparator<? super E> comparator()
      {
          return getCollection().comparator();
      }
  
      /** {@inheritDoc} */
      @Override
      public final ImmutableSortedSet<E> subSet(final E fromElement, final E toElement)
      {
          return new ImmutableTreeSet<E>(getCollection().subSet(fromElement, toElement));
      }
  
      /** {@inheritDoc} */
      @Override
      public final ImmutableSortedSet<E> headSet(final E toElement)
      {
          return new ImmutableTreeSet<E>(getCollection().headSet(toElement));
      }
  
      /** {@inheritDoc} */
      @Override
      public final ImmutableSortedSet<E> tailSet(final E fromElement)
      {
         return new ImmutableTreeSet<E>(getCollection().tailSet(fromElement));
     }
 
     /** {@inheritDoc} */
     @Override
     public final E first()
     {
         return getCollection().first();
     }
 
     /** {@inheritDoc} */
     @Override
     public final E last()
     {
         return getCollection().last();
     }
 
     /** {@inheritDoc} */
     @Override
     public final E lower(final E e)
     {
         return getCollection().lower(e);
     }
 
     /** {@inheritDoc} */
     @Override
     public final E floor(final E e)
     {
         return getCollection().floor(e);
     }
 
     /** {@inheritDoc} */
     @Override
     public final E ceiling(final E e)
     {
         return getCollection().ceiling(e);
     }
 
     /** {@inheritDoc} */
     @Override
     public final E higher(final E e)
     {
         return getCollection().higher(e);
     }
 
     /** {@inheritDoc} */
     @Override
     public final ImmutableNavigableSet<E> descendingSet()
     {
         return new ImmutableTreeSet<E>(getCollection().descendingSet());
     }
 
     /** {@inheritDoc} */
     @Override
     public final ImmutableIterator<E> descendingIterator()
     {
         return new ImmutableIterator<E>(getCollection().descendingIterator());
     }
 
     /** {@inheritDoc} */
     @Override
     public final ImmutableNavigableSet<E> subSet(final E fromElement, final boolean fromInclusive, final E toElement,
             final boolean toInclusive)
     {
         return new ImmutableTreeSet<E>(getCollection().subSet(fromElement, fromInclusive, toElement, toInclusive));
     }
 
     /** {@inheritDoc} */
     @Override
     public final ImmutableNavigableSet<E> headSet(final E toElement, final boolean inclusive)
     {
         return new ImmutableTreeSet<E>(getCollection().headSet(toElement, inclusive));
     }
 
     /** {@inheritDoc} */
     @Override
     public final ImmutableNavigableSet<E> tailSet(final E fromElement, final boolean inclusive)
     {
         return new ImmutableTreeSet<E>(getCollection().tailSet(fromElement, inclusive));
     }
 
     /** {@inheritDoc} */
     @Override
     public final String toString()
     {
         NavigableSet<E> set = getCollection();
         if (null == set)
         {
             return "ImmutableTreeSet []";
         }
         return "ImmutableTreeSet [" + set.toString() + "]";
     }
 
 }