Implemented the PedestrianStateProcessor

PedestrianStateProcessor adds a column "state" to the output with the
state of a pedestrian.

The possible states are:
 - c = Pedestrian was created
 - m = Pedestrian has moved
 - d = Pedestrian was deleted (has reached its final target)
 
The state is needed for the UQ simulations.

VadereSimulator/src/org/vadere/simulator/projects/dataprocessing/processor/PedestrianStateProcessor.java

+package org.vadere.simulator.projects.dataprocessing.processor;
+
+import java.util.List;
+import java.util.stream.Collectors;
+
+import org.vadere.simulator.control.SimulationState;
+import org.vadere.simulator.projects.dataprocessing.ProcessorManager;
+import org.vadere.simulator.projects.dataprocessing.datakey.TimestepPedestrianIdKey;
+import org.vadere.state.scenario.Pedestrian;
+
+/**
+ * @brief   PedestrianStateProcessor adds a column "state" to the output with the state of a pedestrian.
+ * 
+ * @details The possible states are:
+ *           - c = Pedestrian was created
+ *           - m = Pedestrian has moved
+ *           - d = Pedestrian was deleted (has reached its final target)
+ * 
+ * @author  Florian Künzner
+ *
+ */
+public class PedestrianStateProcessor extends DataProcessor<TimestepPedestrianIdKey, String> {
+
+	public PedestrianStateProcessor() {
+		super("state");
+	}
+	
+	@Override
+	public void init(ProcessorManager manager) {
+		// No initialization needed		
+	}
+	
+	@Override
+	protected void doUpdate(SimulationState state) {
+		List<Integer> pedsInThisState = state.getTopography().getElements(Pedestrian.class).stream()
+			.map(ped -> ped.getId())
+			.collect(Collectors.toList());
+		
+		//insert ped states c = created or m = moved 
+		pedsInThisState.stream()
+			.forEach(id -> {
+				boolean pedEntryExists = getKeys().stream()
+					.filter(ped -> ped.getPedestrianId() == id)
+					.count() > 0;
+					
+				String pedState = pedEntryExists ? "m" : "c";
+				this.setValue(new TimestepPedestrianIdKey(state.getStep(), id), pedState);
+			});
+		
+		//detect deleted peds and inserts states d = deleted
+		int previousStep = state.getStep() - 1;
+		List<Integer> activePedsInPreviousState = getKeys().stream()
+			.filter(key -> key.getTimestep() == previousStep)
+			.filter(key -> getValue(key) != "d")
+			.map(TimestepPedestrianIdKey::getPedestrianId)
+			.collect(Collectors.toList());
+		
+		List<Integer> deletedPeds = activePedsInPreviousState.stream()
+			.filter(id -> !pedsInThisState.contains(id))
+			.collect(Collectors.toList());
+		
+		deletedPeds.stream()
+			.forEach(id -> this.setValue(new TimestepPedestrianIdKey(previousStep, id), "d"));
+	}
+}