it.cnr.istc.pst.platinum.ai.framework.time.solver.apsp.APSPTemporalSolver.getDistance(TimePoint,TimePoint) - Code Metrics - Inspection of "Refactoring and general improvements" - pstlab/PLATINUm - Measure and Improve Code Quality continuously with Scrutinizer

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Push — master ( 634a3f...1f3b93 )

by Alessandro

created 2021-04-25 19:41 UTC

getDistance(TimePoint,TimePoint) A

↳ Parent: it.cnr.istc.pst.platinum.ai.framework.time.solver.apsp.APSPTemporalSolver

Complexity

Conditions

Size

Total Lines	25
Code Lines	11

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	4
eloc	11
dl	0
loc	25
rs	9.85
c	0
b	0
f	0

package it.cnr.istc.pst.platinum.ai.framework.time.solver.apsp;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

import it.cnr.istc.pst.platinum.ai.framework.time.solver.TemporalSolver;
import it.cnr.istc.pst.platinum.ai.framework.time.tn.TemporalNetwork;
import it.cnr.istc.pst.platinum.ai.framework.time.tn.TimePoint;
import it.cnr.istc.pst.platinum.ai.framework.time.tn.lang.event.TemporalNetworkNotification;
import it.cnr.istc.pst.platinum.ai.framework.time.tn.lang.query.TimePointDistanceFromOriginQuery;
import it.cnr.istc.pst.platinum.ai.framework.time.tn.lang.query.TimePointDistanceQuery;
import it.cnr.istc.pst.platinum.ai.framework.time.tn.lang.query.TimePointDistanceToHorizonQuery;
import it.cnr.istc.pst.platinum.ai.framework.time.tn.lang.query.TimePointQuery;
import it.cnr.istc.pst.platinum.ai.framework.time.tn.lang.query.TimePointScheduleQuery;

/**
 * 
 * @author alessandro
 *
 */
public final class APSPTemporalSolver extends TemporalSolver<TimePointQuery>
{
	private DistanceGraph dg;									// distance graph
	private Map<TimePoint, Map<TimePoint, Long>> distance;		// the distance matrix containing the minimum distances between points;
	private boolean toPropagate;								// lazy approach - propagate constraint only when needed
	private int propagationCounter;		
	
	/**
	 * Create an All-Pair-Shortest-Path Solver instance.
	 * 
	 */
	public APSPTemporalSolver(TemporalNetwork tn) {
		super(tn);
		
		// initialize APSP data structure
		this.distance = null;
		// attribute for testing purposes
		this.propagationCounter = 0;
		// initialize
		this.dg();
		// set flag
		this.toPropagate = true;
	}
	
	/**
	 * 
	 */
	private void dg() {

		// create the distance graph
		this.dg = new DistanceGraph();
		// set temporal horizon
		this.dg.setInfity(this.tn.getHorizon());
		// add all points to the distance graph
		for (TimePoint point : this.tn.getTimePoints()) {
			// add node to the distance graph
			this.dg.add(point);
		}
		
		// add edges between points 
		for (TimePoint reference : this.tn.getTimePoints()) {
			for (TimePoint target : this.tn.getTimePoints()) {
				
				// check if different
				if (!reference.equals(target)) {
					
					// get constraint bounds
					long[] bounds = this.tn.getConstraintBounds(reference, target);
					// check if a bound exists
					if (bounds != null) {
						
						// set distance graph's edges according to the computed bounds
						this.dg.add(reference, target, bounds[1]);
						this.dg.add(target, reference, -bounds[0]);
					}
				} 
			}
		}
	}
	
	/**
	 * 
	 * @return
	 */
	@Override
	public boolean isConsistent() 
	{
		// check information status
		if (this.toPropagate) {
			// clean distance matrix's data
			this.compute();
		}
		
		// check consistency
		boolean consistent = true;
		Iterator<TimePoint> it = this.dg.getPoints().iterator();
		while (it.hasNext() && consistent) {
			
			// next time point
			TimePoint tp = it.next();
			// check cyclic distance
			long d = this.distance.get(tp).get(tp);
			// check condition
			consistent = (d == 0);
		}
		
		// get consistency check result
		return consistent;
	}
	
	/**
	 * 
	 */
	@Override
	public void notify(TemporalNetworkNotification info)
	{
		// check notification type
		switch (info.getType()) 
		{
			// temporal network initialized
//			case INITIALIZATION: {
//		
//				// initialize data structures
//				this.dg();
//				// set to propagate flag
//				this.toPropagate = true;
//			}
//			break;
		
			// temporal constraint added
//			case ADD_REL: {
//
//				// handle request
//				AddRelationTemporalNetworkNotification notif = (AddRelationTemporalNetworkNotification) info;
//				// check pairs of involved time points
//				Map<TimePoint, Set<TimePoint>> p2p= new HashMap<>();
//				// check added constraints
//				for (TimePointDistanceConstraint constraint : notif.getRels()) {
//					// check time points
//					if (!p2p.containsKey(constraint.getReference())) {
//						p2p.put(constraint.getReference(), new HashSet<>());
//					}
//					
//					// add pair
//					p2p.get(constraint.getReference()).add(constraint.getTarget());
//				}
//				
//				
//				// update the internal distance graph
//				for (TimePoint reference : p2p.keySet()) {
//					for (TimePoint target : p2p.get(reference)) {
//						
//						// get constraint bounds
//						long[] bounds = this.tn.getConstraintBounds(reference, target);
//						// check if bound exists
//						if (bounds != null) {
//							// add/replace the associated edge of the distance graph
//							this.dg.add(reference, target, bounds[1]);
//							this.dg.add(target, reference, -bounds[0]);
//						}
//					}
//				}
//				
//				// set propagate flag
//				this.toPropagate = true;
//			}
//			break;
			
			// temporal constraint deleted 
//			case DEL_REL: {
//				
//				// handle request
//				DelRelationTemporalNetworkNotification notif = (DelRelationTemporalNetworkNotification) info;
//				// check pairs of involved time points
//				Map<TimePoint, Set<TimePoint>> p2p= new HashMap<>();
//				for (TimePointDistanceConstraint constraint : notif.getRels()) {
//					// check time points
//					if (!p2p.containsKey(constraint.getReference())) {
//						p2p.put(constraint.getReference(), new HashSet<>());
//					}
//					
//					// add pair
//					p2p.get(constraint.getReference()).add(constraint.getTarget());
//				}
//				
//				
//				// update the internal distance graph
//				for (TimePoint reference : p2p.keySet()) {
//					for (TimePoint target : p2p.get(reference)) {
//						
//						// get constraint bounds
//						long[] bounds = this.tn.getConstraintBounds(reference, target);
//						// check if bound exists
//						if (bounds != null) {
//							// add/replace the associated edge of the distance graph
//							this.dg.add(reference, target, bounds[1]);
//							this.dg.add(target, reference, -bounds[0]);
//						}
//					}
//				}
//				
//				// set propagate flag
//				this.toPropagate = true;
//			}
//			break;
			
			// time point deleted
			case INITIALIZATION :
			case ADD_TP : 
			case ADD_REL : 
			case DEL_REL : 
			case DEL_TP : {
				
				// handle request
//				DelTimePointTemporalNetworkNotification notif = (DelTimePointTemporalNetworkNotification) info;
				// delete time points
//				for (TimePoint point : notif.getPoints()) {
//					// delete node from the distance graph
//					this.dg.delete(point);
//				}
//				
				// recompute dependency graph distance bounds
				this.dg();	
				// set to propagate flag
				this.toPropagate = true;
			}
			break;
			
			// time point added 
//			case ADD_TP: {
//				
//				// handle request
//				AddTimePointTemporalNetworkNotification notif = (AddTimePointTemporalNetworkNotification) info;
//				// get added time points
//				for (TimePoint point : notif.getPoints()) {
//					// add the point to the distance graph
//					this.dg.add(point);
//				}
//				
//				
//				// it is not necessary to update information yet
//				this.toPropagate = true;
//			}
//			break;
			
			// other	
			default: {
				throw new RuntimeException("[" + this.getClass().getName() + "]: Unknown notification received type= " + info.getType());

			}
		}
	}
	
	/**
	 * 
	 * @return
	 */
	public DistanceGraph getDistanceGraph() {
		// get the distance graph
		return this.dg;
	}
	
	/**
	 * 
	 */
	@Override
	public String toString() {
		// check if to propagate
		if (this.toPropagate) {
			this.compute();
		}
		
		// print distance matrix 
		String matrix = "Distance matrix (Computed by Floyd-Warshall Algorithm)\n";
		if (this.toPropagate) {
			// not update distance information
			matrix += "Not Updated Distance Information";
		} else {
			for (TimePoint i : this.dg.getPoints()) {
				for (TimePoint j : this.dg.getPoints()) {
					matrix += "\t" + this.distance.get(i).get(j);

				}
				matrix += "\n";

			}
		}
		
		// get description of the distance matrix
		return matrix;
	}
	
	/**
	 * Returns the number of temporal propagation actually done
	 * Only for testing purposes
	 * 
	 * @return
	 */
	public int getPropagationCounter() {
		return propagationCounter;
	}
	
	/**
	 * 
	 */
	@Override
	public void process(TimePointQuery query) {
		
		// check query type 
		switch (query.getType()) {
		
			// handle time point bound query
			case TP_SCHEDULE : {
				
				// get query
				TimePointScheduleQuery tpBoundQuery = (TimePointScheduleQuery) query;
				// get time point
				TimePoint point = tpBoundQuery.getTimePoint();
				// get distance between the origin and the time point
				long[] distance = this.getDistance(this.tn.getOriginTimePoint(), point); 

				// set information 
				point.setLowerBound(distance[0]);
				point.setUpperBound(distance[1]);
			}
			break;
			
			// handle time point distance query
			case TP_DISTANCE : {
				
				// get query
				TimePointDistanceQuery tpDistanceQuery = (TimePointDistanceQuery) query;
				// get source point 
				TimePoint source = tpDistanceQuery.getSource();
				// get target point 
				TimePoint target = tpDistanceQuery.getTarget();
				// get distance between points
				long[] distance = this.getDistance(source, target);

				// set information
				tpDistanceQuery.setDistanceLowerBound(distance[0]);
				tpDistanceQuery.setDistanceUpperBound(distance[1]);
			}
			break;
			
			// handle time point distance from origin query
			case TP_DISTANCE_FROM_ORIGIN : {
				
				// get query
				TimePointDistanceFromOriginQuery tpDistanceQuery = (TimePointDistanceFromOriginQuery) query;
				// get time point
				TimePoint tp = tpDistanceQuery.getTimePoint();
				// get distance to horizon
				long[] distance = this.getDistance(this.tn.getOriginTimePoint(), tp);

				// set information
				tpDistanceQuery.setDistance(distance);
			}
			break;
			
			// handle time point distance to horizon query
			case TP_DISTANCE_TO_HORIZON : {
				
				// get query 
				TimePointDistanceToHorizonQuery tpDistanceQuery = (TimePointDistanceToHorizonQuery) query;
				// get time point
				TimePoint tp = tpDistanceQuery.getTimePoint();
				// get distance to horizon
				long[] distance = this.getDistance(tp, this.tn.getHorizonTimePoint());

				// set information
				tpDistanceQuery.setDistance(distance);
			}
			break;
			
			default : {
				
				// not a time point query
				throw new RuntimeException("Impossible to process this type of temporal query " + query.getType());

			}
		}
	}
	
	/**
	 * Returns distance lower and upper bounds of Time Point 
	 * tp1 to Time Point tp2 
	 * 
	 * @param tp1
	 * @param tp2
	 * @return
	 */
	protected long[] getDistance(TimePoint tp1, TimePoint tp2) {
		
		// compute minimal minimal network if needed
		if (this.toPropagate) {
			// clean distance matrix's data
			this.compute();
		}
		
		// default distance bounds - total uncertainty
		long[] bounds = new long[] {
				0, 
				this.tn.getHorizon()
		};
		
		// check if both time points exists
		if (this.distance.containsKey(tp1) && this.distance.get(tp1).containsKey(tp2)) {
			// set bounds
			bounds = new long[] {
					-this.distance.get(tp2).get(tp1),		// lower bound
					this.distance.get(tp1).get(tp2)			// upper bound
				};
		}
		
		// get bounds
		return bounds;
	}
	
	/**
	 * 
	 */
	private void compute() {
		
		// check size of the distance graph
		this.distance = new HashMap<TimePoint, Map<TimePoint, Long>>();
		// initialize distances to infinity
		for (TimePoint i : this.dg.getPoints()) {
			
			this.distance.put(i, new HashMap<TimePoint, Long>());
			for (TimePoint j : this.dg.getPoints()) {
				
				// initialize
				if (i.equals(j)) {
					
					this.distance.get(i).put(j, 0l);
					
				} else {
					
					this.distance.get(i).put(j, this.dg.getInfity());
				}
			}
		}
		
		// initialize distances using the weights of the distance graph's edges
		for (TimePoint point : this.dg.getPoints()) {
			
			// get adjacent points
			for (TimePoint adj : this.dg.getAdjacents(point)) {
				// get distance
				long distance = this.dg.getDistance(point, adj);

				// set distance
				this.distance.get(point).put(adj, distance);
			}
		}
		
		// compute minimum distances - k intermediate node
		for (TimePoint k : this.dg.getPoints()) {
			// compute shortest paths using intermediate points
			for (TimePoint i : this.dg.getPoints()) {
				for (TimePoint j : this.dg.getPoints()) {
					
					// compute the path from i to j through k
					long path = this.distance.get(i).get(k) + this.distance.get(k).get(j);
					// compare computed distance with the direct path
					if (this.distance.get(i).get(j) > path) {
						
						// update distance
						this.distance.get(i).put(j, path);
					}
				}
			}
		}
		
		// update propagation counter
		this.propagationCounter++;
		// set propagation flag
		this.toPropagate = false;
	}
	
	/**
	 * 
	 */
	@Override
	public void printDiagnosticData() {
		// compute if temporal data
		if (this.toPropagate) {
			this.compute();
		}
		
		System.out.println("Distance Graph:\n"
				+ "" + this.dg + "\n\n"
				+ "Distance matrix:\n"
				+ "" + this + "\n");
	}
}


1			package it.cnr.istc.pst.platinum.ai.framework.time.solver.apsp;
2
3			import java.util.HashMap;
4			import java.util.Iterator;
5			import java.util.Map;
6
7			import it.cnr.istc.pst.platinum.ai.framework.time.solver.TemporalSolver;
8			import it.cnr.istc.pst.platinum.ai.framework.time.tn.TemporalNetwork;
9			import it.cnr.istc.pst.platinum.ai.framework.time.tn.TimePoint;
10			import it.cnr.istc.pst.platinum.ai.framework.time.tn.lang.event.TemporalNetworkNotification;
11			import it.cnr.istc.pst.platinum.ai.framework.time.tn.lang.query.TimePointDistanceFromOriginQuery;
12			import it.cnr.istc.pst.platinum.ai.framework.time.tn.lang.query.TimePointDistanceQuery;
13			import it.cnr.istc.pst.platinum.ai.framework.time.tn.lang.query.TimePointDistanceToHorizonQuery;
14			import it.cnr.istc.pst.platinum.ai.framework.time.tn.lang.query.TimePointQuery;
15			import it.cnr.istc.pst.platinum.ai.framework.time.tn.lang.query.TimePointScheduleQuery;
16
17			/**
18			*
19			* @author alessandro
20			*
21			*/
22			public final class APSPTemporalSolver extends TemporalSolver<TimePointQuery>
23			{
24			private DistanceGraph dg; // distance graph
25			private Map<TimePoint, Map<TimePoint, Long>> distance; // the distance matrix containing the minimum distances between points;
26			private boolean toPropagate; // lazy approach - propagate constraint only when needed
27			private int propagationCounter;
28
29			/**
30			* Create an All-Pair-Shortest-Path Solver instance.
31			*
32			*/
33			public APSPTemporalSolver(TemporalNetwork tn) {
34			super(tn);
35
36			// initialize APSP data structure
37			this.distance = null;
38			// attribute for testing purposes
39			this.propagationCounter = 0;
40			// initialize
41			this.dg();
42			// set flag
43			this.toPropagate = true;
44			}
45
46			/**
47			*
48			*/
49			private void dg() {
50
51			// create the distance graph
52			this.dg = new DistanceGraph();
53			// set temporal horizon
54			this.dg.setInfity(this.tn.getHorizon());
55			// add all points to the distance graph
56			for (TimePoint point : this.tn.getTimePoints()) {
57			// add node to the distance graph
58			this.dg.add(point);
59			}
60
61			// add edges between points
62			for (TimePoint reference : this.tn.getTimePoints()) {
63			for (TimePoint target : this.tn.getTimePoints()) {
64
65			// check if different
66			if (!reference.equals(target)) {
67
68			// get constraint bounds
69			long[] bounds = this.tn.getConstraintBounds(reference, target);
70			// check if a bound exists
71			if (bounds != null) {
72
73			// set distance graph's edges according to the computed bounds
74			this.dg.add(reference, target, bounds[1]);
75			this.dg.add(target, reference, -bounds[0]);
76			}
77			}
78			}
79			}
80			}
81
82			/**
83			*
84			* @return
85			*/
86			@Override
87			public boolean isConsistent()
88			{
89			// check information status
90			if (this.toPropagate) {
91			// clean distance matrix's data
92			this.compute();
93			}
94
95			// check consistency
96			boolean consistent = true;
97			Iterator<TimePoint> it = this.dg.getPoints().iterator();
98			while (it.hasNext() && consistent) {
99
100			// next time point
101			TimePoint tp = it.next();
102			// check cyclic distance
103			long d = this.distance.get(tp).get(tp);
104			// check condition
105			consistent = (d == 0);
106			}
107
108			// get consistency check result
109			return consistent;
110			}
111
112			/**
113			*
114			*/
115			@Override
116			public void notify(TemporalNetworkNotification info)
117			{
118			// check notification type
119			switch (info.getType())
120			{
121			// temporal network initialized
122			// case INITIALIZATION: {
123			//
124			// // initialize data structures
125			// this.dg();
126			// // set to propagate flag
127			// this.toPropagate = true;
128			// }
129			// break;
130
131			// temporal constraint added
132			// case ADD_REL: {
133			//
134			// // handle request
135			// AddRelationTemporalNetworkNotification notif = (AddRelationTemporalNetworkNotification) info;
136			// // check pairs of involved time points
137			// Map<TimePoint, Set<TimePoint>> p2p= new HashMap<>();
138			// // check added constraints
139			// for (TimePointDistanceConstraint constraint : notif.getRels()) {
140			// // check time points
141			// if (!p2p.containsKey(constraint.getReference())) {
142			// p2p.put(constraint.getReference(), new HashSet<>());
143			// }
144			//
145			// // add pair
146			// p2p.get(constraint.getReference()).add(constraint.getTarget());
147			// }
148			//
149			//
150			// // update the internal distance graph
151			// for (TimePoint reference : p2p.keySet()) {
152			// for (TimePoint target : p2p.get(reference)) {
153			//
154			// // get constraint bounds
155			// long[] bounds = this.tn.getConstraintBounds(reference, target);
156			// // check if bound exists
157			// if (bounds != null) {
158			// // add/replace the associated edge of the distance graph
159			// this.dg.add(reference, target, bounds[1]);
160			// this.dg.add(target, reference, -bounds[0]);
161			// }
162			// }
163			// }
164			//
165			// // set propagate flag
166			// this.toPropagate = true;
167			// }
168			// break;
169
170			// temporal constraint deleted
171			// case DEL_REL: {
172			//
173			// // handle request
174			// DelRelationTemporalNetworkNotification notif = (DelRelationTemporalNetworkNotification) info;
175			// // check pairs of involved time points
176			// Map<TimePoint, Set<TimePoint>> p2p= new HashMap<>();
177			// for (TimePointDistanceConstraint constraint : notif.getRels()) {
178			// // check time points
179			// if (!p2p.containsKey(constraint.getReference())) {
180			// p2p.put(constraint.getReference(), new HashSet<>());
181			// }
182			//
183			// // add pair
184			// p2p.get(constraint.getReference()).add(constraint.getTarget());
185			// }
186			//
187			//
188			// // update the internal distance graph
189			// for (TimePoint reference : p2p.keySet()) {
190			// for (TimePoint target : p2p.get(reference)) {
191			//
192			// // get constraint bounds
193			// long[] bounds = this.tn.getConstraintBounds(reference, target);
194			// // check if bound exists
195			// if (bounds != null) {
196			// // add/replace the associated edge of the distance graph
197			// this.dg.add(reference, target, bounds[1]);
198			// this.dg.add(target, reference, -bounds[0]);
199			// }
200			// }
201			// }
202			//
203			// // set propagate flag
204			// this.toPropagate = true;
205			// }
206			// break;
207
208			// time point deleted
209			case INITIALIZATION :
210			case ADD_TP :
211			case ADD_REL :
212			case DEL_REL :
213			case DEL_TP : {
214
215			// handle request
216			// DelTimePointTemporalNetworkNotification notif = (DelTimePointTemporalNetworkNotification) info;
217			// delete time points
218			// for (TimePoint point : notif.getPoints()) {
219			// // delete node from the distance graph
220			// this.dg.delete(point);
221			// }
222			//
223			// recompute dependency graph distance bounds
224			this.dg();
225			// set to propagate flag
226			this.toPropagate = true;
227			}
228			break;
229
230			// time point added
231			// case ADD_TP: {
232			//
233			// // handle request
234			// AddTimePointTemporalNetworkNotification notif = (AddTimePointTemporalNetworkNotification) info;
235			// // get added time points
236			// for (TimePoint point : notif.getPoints()) {
237			// // add the point to the distance graph
238			// this.dg.add(point);
239			// }
240			//
241			//
242			// // it is not necessary to update information yet
243			// this.toPropagate = true;
244			// }
245			// break;
246
247			// other
248			default: {
249			throw new RuntimeException("[" + this.getClass().getName() + "]: Unknown notification received type= " + info.getType());
			0 ignored issues – show Best Practice introduced 2021-04-10 16:53 UTC by Report Bug Copy Issue Report Dedicated exceptions should be preferred over throwing the generic Exception. Loading history...
250			}
251			}
252			}
253
254			/**
255			*
256			* @return
257			*/
258			public DistanceGraph getDistanceGraph() {
259			// get the distance graph
260			return this.dg;
261			}
262
263			/**
264			*
265			*/
266			@Override
267			public String toString() {
268			// check if to propagate
269			if (this.toPropagate) {
270			this.compute();
271			}
272
273			// print distance matrix
274			String matrix = "Distance matrix (Computed by Floyd-Warshall Algorithm)\n";
275			if (this.toPropagate) {
276			// not update distance information
277			matrix += "Not Updated Distance Information";
278			} else {
279			for (TimePoint i : this.dg.getPoints()) {
280			for (TimePoint j : this.dg.getPoints()) {
281			matrix += "\t" + this.distance.get(i).get(j);
			0 ignored issues – show Performance introduced 2021-04-10 16:53 UTC by Report Bug Copy Issue Report String concatenation with + is inefficient. Doing so in a loop may incur a significant performance penalty. Consider using a `StringBuilder` instead Loading history...
282			}
283			matrix += "\n";
			0 ignored issues – show Performance introduced 2021-04-10 16:53 UTC by Report Bug Copy Issue Report String concatenation with + is inefficient. Doing so in a loop may incur a significant performance penalty. Consider using a `StringBuilder` instead Loading history...
284			}
285			}
286
287			// get description of the distance matrix
288			return matrix;
289			}
290
291			/**
292			* Returns the number of temporal propagation actually done
293			* Only for testing purposes
294			*
295			* @return
296			*/
297			public int getPropagationCounter() {
298			return propagationCounter;
299			}
300
301			/**
302			*
303			*/
304			@Override
305			public void process(TimePointQuery query) {
306
307			// check query type
308			switch (query.getType()) {
309
310			// handle time point bound query
311			case TP_SCHEDULE : {
312
313			// get query
314			TimePointScheduleQuery tpBoundQuery = (TimePointScheduleQuery) query;
315			// get time point
316			TimePoint point = tpBoundQuery.getTimePoint();
317			// get distance between the origin and the time point
318			long[] distance = this.getDistance(this.tn.getOriginTimePoint(), point);
			0 ignored issues – show Comprehensibility introduced 2021-04-10 16:53 UTC by Report Bug Copy Issue Report The variable `distance`shadows a field with the same name declared in line 25. Consider renaming it. Loading history...
319			// set information
320			point.setLowerBound(distance[0]);
321			point.setUpperBound(distance[1]);
322			}
323			break;
324
325			// handle time point distance query
326			case TP_DISTANCE : {
327
328			// get query
329			TimePointDistanceQuery tpDistanceQuery = (TimePointDistanceQuery) query;
330			// get source point
331			TimePoint source = tpDistanceQuery.getSource();
332			// get target point
333			TimePoint target = tpDistanceQuery.getTarget();
334			// get distance between points
335			long[] distance = this.getDistance(source, target);
			0 ignored issues – show Comprehensibility introduced 2021-04-10 16:53 UTC by Report Bug Copy Issue Report The variable `distance`shadows a field with the same name declared in line 25. Consider renaming it. Loading history...
336			// set information
337			tpDistanceQuery.setDistanceLowerBound(distance[0]);
338			tpDistanceQuery.setDistanceUpperBound(distance[1]);
339			}
340			break;
341
342			// handle time point distance from origin query
343			case TP_DISTANCE_FROM_ORIGIN : {
344
345			// get query
346			TimePointDistanceFromOriginQuery tpDistanceQuery = (TimePointDistanceFromOriginQuery) query;
347			// get time point
348			TimePoint tp = tpDistanceQuery.getTimePoint();
349			// get distance to horizon
350			long[] distance = this.getDistance(this.tn.getOriginTimePoint(), tp);
			0 ignored issues – show Comprehensibility introduced 2021-04-10 16:53 UTC by Report Bug Copy Issue Report The variable `distance`shadows a field with the same name declared in line 25. Consider renaming it. Loading history...
351			// set information
352			tpDistanceQuery.setDistance(distance);
353			}
354			break;
355
356			// handle time point distance to horizon query
357			case TP_DISTANCE_TO_HORIZON : {
358
359			// get query
360			TimePointDistanceToHorizonQuery tpDistanceQuery = (TimePointDistanceToHorizonQuery) query;
361			// get time point
362			TimePoint tp = tpDistanceQuery.getTimePoint();
363			// get distance to horizon
364			long[] distance = this.getDistance(tp, this.tn.getHorizonTimePoint());
			0 ignored issues – show Comprehensibility introduced 2021-04-10 16:53 UTC by Report Bug Copy Issue Report The variable `distance`shadows a field with the same name declared in line 25. Consider renaming it. Loading history...
365			// set information
366			tpDistanceQuery.setDistance(distance);
367			}
368			break;
369
370			default : {
371
372			// not a time point query
373			throw new RuntimeException("Impossible to process this type of temporal query " + query.getType());
			0 ignored issues – show Best Practice introduced 2021-04-25 19:47 UTC by Report Bug Copy Issue Report Dedicated exceptions should be preferred over throwing the generic Exception. Loading history...
374			}
375			}
376			}
377
378			/**
379			* Returns distance lower and upper bounds of Time Point
380			* tp1 to Time Point tp2
381			*
382			* @param tp1
383			* @param tp2
384			* @return
385			*/
386			protected long[] getDistance(TimePoint tp1, TimePoint tp2) {
387
388			// compute minimal minimal network if needed
389			if (this.toPropagate) {
390			// clean distance matrix's data
391			this.compute();
392			}
393
394			// default distance bounds - total uncertainty
395			long[] bounds = new long[] {
396			0,
397			this.tn.getHorizon()
398			};
399
400			// check if both time points exists
401			if (this.distance.containsKey(tp1) && this.distance.get(tp1).containsKey(tp2)) {
402			// set bounds
403			bounds = new long[] {
404			-this.distance.get(tp2).get(tp1), // lower bound
405			this.distance.get(tp1).get(tp2) // upper bound
406			};
407			}
408
409			// get bounds
410			return bounds;
411			}
412
413			/**
414			*
415			*/
416			private void compute() {
417
418			// check size of the distance graph
419			this.distance = new HashMap<TimePoint, Map<TimePoint, Long>>();
420			// initialize distances to infinity
421			for (TimePoint i : this.dg.getPoints()) {
422
423			this.distance.put(i, new HashMap<TimePoint, Long>());
424			for (TimePoint j : this.dg.getPoints()) {
425
426			// initialize
427			if (i.equals(j)) {
428
429			this.distance.get(i).put(j, 0l);
430
431			} else {
432
433			this.distance.get(i).put(j, this.dg.getInfity());
434			}
435			}
436			}
437
438			// initialize distances using the weights of the distance graph's edges
439			for (TimePoint point : this.dg.getPoints()) {
440
441			// get adjacent points
442			for (TimePoint adj : this.dg.getAdjacents(point)) {
443			// get distance
444			long distance = this.dg.getDistance(point, adj);
			0 ignored issues – show Comprehensibility introduced 2021-04-25 19:47 UTC by Report Bug Copy Issue Report The variable `distance`shadows a field with the same name declared in line 25. Consider renaming it. Loading history...
445			// set distance
446			this.distance.get(point).put(adj, distance);
447			}
448			}
449
450			// compute minimum distances - k intermediate node
451			for (TimePoint k : this.dg.getPoints()) {
452			// compute shortest paths using intermediate points
453			for (TimePoint i : this.dg.getPoints()) {
454			for (TimePoint j : this.dg.getPoints()) {
455
456			// compute the path from i to j through k
457			long path = this.distance.get(i).get(k) + this.distance.get(k).get(j);
458			// compare computed distance with the direct path
459			if (this.distance.get(i).get(j) > path) {
460
461			// update distance
462			this.distance.get(i).put(j, path);
463			}
464			}
465			}
466			}
467
468			// update propagation counter
469			this.propagationCounter++;
470			// set propagation flag
471			this.toPropagate = false;
472			}
473
474			/**
475			*
476			*/
477			@Override
478			public void printDiagnosticData() {
479			// compute if temporal data
480			if (this.toPropagate) {
481			this.compute();
482			}
483
484			System.out.println("Distance Graph:\n"
485			+ "" + this.dg + "\n\n"
486			+ "Distance matrix:\n"
487			+ "" + this + "\n");
488			}
489			}
490

pstlab / PLATINUm

Push — master ( 634a3f...1f3b93 )

getDistance(TimePoint,TimePoint) A

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