HistoricalHashMap.java
- package org.opentrafficsim.core.perception.collections;
- import java.util.LinkedHashMap;
- import java.util.Map;
- import org.djunits.value.vdouble.scalar.Time;
- import org.opentrafficsim.core.perception.HistoryManager;
- /**
- * LinkedHashMap-valued historical state. The current hash map is always maintained, and past states of the hash map are obtained by
- * applying the events between now and the requested time in reverse.<br>
- * <br>
- * The set views returned by this class are unmodifiable.
- * <p>
- * Copyright (c) 2013-2020 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 3 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 <K> key type
- * @param <V> value type
- */
- public class HistoricalHashMap<K, V> extends AbstractHistoricalMap<K, V, LinkedHashMap<K, V>>
- {
- /**
- * Constructor.
- * @param historyManager HistoryManager; history manager
- */
- public HistoricalHashMap(final HistoryManager historyManager)
- {
- super(historyManager, new LinkedHashMap<>());
- }
- /**
- * Constructor.
- * @param historyManager HistoryManager; history manager
- * @param m Map<? extends K, ? extends V>; initial map
- */
- public HistoricalHashMap(final HistoryManager historyManager, final Map<? extends K, ? extends V> m)
- {
- super(historyManager, new LinkedHashMap<>(m));
- }
- /** {@inheritDoc} */
- @Override
- public LinkedHashMap<K, V> get()
- {
- return getMap();
- }
- /** {@inheritDoc} */
- @Override
- public LinkedHashMap<K, V> get(final Time time)
- {
- if (isLastState(time))
- {
- return getMap();
- }
- return fill(time, new LinkedHashMap<>());
- }
- /** {@inheritDoc} */
- @Override
- public String toString()
- {
- return "HistoricalHashMap [current=" + getMap() + "]";
- }
- }