Use Map.compute to optimize counting

Author: dr-jts

modules/core/src/main/java/org/locationtech/jts/coverage/CoverageRingEdges.java

@@ -320,8 +320,8 @@ private Set<Coordinate> findMultiRingNodes(Geometry[] coverage) {
   private Set<Coordinate> findBoundaryNodes(Set<LineSegment> boundarySegments) {
     Map<Coordinate, Integer> counter = new HashMap<>();
     for (LineSegment seg : boundarySegments) {
-      counter.put(seg.p0, counter.getOrDefault(seg.p0, 0) + 1);
-      counter.put(seg.p1, counter.getOrDefault(seg.p1, 0) + 1);
+      counter.compute(seg.p0, (key, value) -> value == null ? 1 : value + 1);
+      counter.compute(seg.p1, (key, value) -> value == null ? 1 : value + 1);
     }
     return counter.entrySet().stream()
         .filter(e->e.getValue() > 2)

modules/core/src/main/java/org/locationtech/jts/coverage/VertexRingCounter.java

@@ -51,9 +51,7 @@ public void filter(CoordinateSequence seq, int i) {
     if (CoordinateSequences.isRing(seq) && i == 0)
       return;
     Coordinate v = seq.getCoordinate(i);
-    int count = vertexRingCount.containsKey(v) ? vertexRingCount.get(v) : 0;
-    count++;
-    vertexRingCount.put(v, count);
+    vertexRingCount.compute(v, (key,  val) -> val == null ? 1 : val + 1);
   }
 
   @Override