PerceptionCollectable.java
package org.opentrafficsim.road.gtu.lane.perception;
import java.util.function.Supplier;
import org.djunits.value.vdouble.scalar.Length;
import org.opentrafficsim.road.gtu.lane.perception.headway.Headway;
/**
* Iterable that additionally provides support for PerceptionCollectors. These gather raw data, to only 'perceive' the result.
* <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 1 mrt. 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 <H> headway type
* @param <U> underlying object type
*/
public interface PerceptionCollectable<H extends Headway, U> extends PerceptionIterable<H>
{
/**
* Collect the underlying objects in to a perceived result. This methodology is loosely based on Stream.collect().
* @param collector PerceptionCollector<C, ? super U, I>; collector
* @param <C> collection result type
* @param <I> intermediate type
* @return C; collection result
*/
default <C, I> C collect(final PerceptionCollector<C, ? super U, I> collector)
{
return collect(collector.getIdentity(), collector.getAccumulator(), collector.getFinalizer());
}
/**
* Collect the underlying objects in to a perceived result. This methodology is loosely based on Stream.collect().
* @param identity Supplier<I>; the initial intermediate result value
* @param accumulator PerceptionAccumulator<? super U, I>; accumulator
* @param finalizer PerceptionFinalizer<C, I>; finalizer
* @param <C> collection result type
* @param <I> intermediate type
* @return C; collection result
*/
<C, I> C collect(Supplier<I> identity, PerceptionAccumulator<? super U, I> accumulator,
PerceptionFinalizer<C, I> finalizer);
/**
* Combination of an accumulator and a finalizer.
* <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 28 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 <C> collection result type
* @param <U> underlying object type
* @param <I> intermediate result type
*/
public interface PerceptionCollector<C, U, I>
{
/**
* Returns the identity value, the initial intermediate value.
* @return I; identity value, the initial intermediate value
*/
Supplier<I> getIdentity();
/**
* Returns the accumulator.
* @return PerceptionAccumulator; accumulator
*/
PerceptionAccumulator<U, I> getAccumulator();
/**
* Returns the finalizer.
* @return PerceptionFinalizer; finalizer
*/
PerceptionFinalizer<C, I> getFinalizer();
}
/**
* Accumulates an object one at a time in to an accumulating intermediate result.
* <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 28 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 <U> underlying object type
* @param <I> intermediate result type
*/
public interface PerceptionAccumulator<U, I>
{
/**
* Accumulate the next object to intermediate result.
* @param intermediate Intermediate<I>; intermediate result before accumulation of object
* @param object U; next object to include
* @param distance Length; distance to the considered object
* @return I; intermediate result after accumulation of object
*/
Intermediate<I> accumulate(Intermediate<I> intermediate, U object, Length distance);
}
/**
* Translates the last intermediate result of an accumulator in to the collection output.
* <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 28 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 <C> collection result type
* @param <I> intermediate result type
*/
public interface PerceptionFinalizer<C, I>
{
/**
* Translate the last intermediate result in to a final result.
* @param intermediate I; last intermediate result
* @return C; final result
*/
C collect(I intermediate);
}
/**
* Wrapper of intermediate result with info for the iterator algorithm.
* <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 3 apr. 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 <I> intermediate result type
*/
class Intermediate<I>
{
/** Number of underlying object being iterated. */
private int number = 0;
/** Intermediate object. */
private I object;
/** Whether to stop accumulating. */
private boolean stop = false;
/**
* Constructor.
* @param object I; identity value
*/
public Intermediate(final I object)
{
this.object = object;
}
/**
* Get intermediate object.
* @return I; intermediate object
*/
public I getObject()
{
return this.object;
}
/**
* Set intermediate object.
* @param object I; intermediate object
*/
public void setObject(final I object)
{
this.object = object;
}
/**
* Returns the number of the underlying object currently being accumulated, starts at 0 for the first.
* @return int; number of the underlying object currently being accumulated
*/
public int getNumber()
{
return this.number;
}
/**
* Method for the iterator to increase the underlying object number.
*/
public void step()
{
this.number++;
}
/**
* Method for the accumulator to indicate the iterator can stop.
*/
public void stop()
{
this.stop = true;
}
/**
* Method for the iterator to check if it can stop.
* @return boolean; whether the iterator can stop
*/
public boolean isStop()
{
return this.stop;
}
}
}