AbstractHistoricalSortedSet.java
package org.opentrafficsim.core.perception.collections;
import java.util.Collections;
import java.util.Comparator;
import java.util.SortedSet;
import org.opentrafficsim.core.perception.HistoryManager;
/**
* SortedSet-valued historical state. The current sorted set is always maintained, and past states of the sorted set are
* obtained by applying the events between now and the requested time in reverse.<br>
* <br>
* The {@code Iterator} returned by this class does not support the {@code remove()} method. Any returned subset is
* unmodifiable.
* <p>
* Copyright (c) 2013-2019 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/node/13">OpenTrafficSim License</a>.
* <p>
* @version $Revision$, $LastChangedDate$, by $Author$, initial version 2 feb. 2018 <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> element type
* @param <S> sorted set type
*/
public abstract class AbstractHistoricalSortedSet<E, S extends SortedSet<E>> extends AbstractHistoricalCollection<E, S>
implements HistoricalSortedSet<E>
{
/**
* Constructor.
* @param historyManager HistoryManager; history manager
* @param set S; initial set
*/
protected AbstractHistoricalSortedSet(final HistoryManager historyManager, final S set)
{
super(historyManager, set);
}
// Non-altering SortedSet methods
/** {@inheritDoc} */
@Override
public Comparator<? super E> comparator()
{
return getCollection().comparator();
}
/** {@inheritDoc} */
@Override
public SortedSet<E> subSet(final E fromElement, final E toElement)
{
return Collections.unmodifiableSortedSet(getCollection().subSet(fromElement, toElement));
}
/** {@inheritDoc} */
@Override
public SortedSet<E> headSet(final E toElement)
{
return Collections.unmodifiableSortedSet(getCollection().headSet(toElement));
}
/** {@inheritDoc} */
@Override
public SortedSet<E> tailSet(final E fromElement)
{
return Collections.unmodifiableSortedSet(getCollection().tailSet(fromElement));
}
/** {@inheritDoc} */
@Override
public E first()
{
return getCollection().first();
}
/** {@inheritDoc} */
@Override
public E last()
{
return getCollection().last();
}
}