reverse key element order

Author: parrt

java/src/org/antlr/codebuff/Corpus.java

@@ -86,7 +86,7 @@ public void buildTokenContextIndex() {
 		for (int i=0; i<X.size(); i++) {
 			int curTokenRuleIndex = X.get(i)[CollectFeatures.INDEX_RULE];
 			int prevTokenRuleIndex = X.get(i)[CollectFeatures.INDEX_PREV_RULE];
-			Pair<Integer, Integer> key = new Pair<>(curTokenRuleIndex, prevTokenRuleIndex);
+			Pair<Integer, Integer> key = new Pair<>(prevTokenRuleIndex, curTokenRuleIndex);
 			List<Integer> vectorIndexes = curAndPrevTokenRuleIndexToVectorsMap.get(key);
 			if ( vectorIndexes==null ) {
 				vectorIndexes = new ArrayList<>();

java/src/org/antlr/codebuff/kNNClassifier.java

@@ -140,7 +140,7 @@ public Neighbor[] kNN(int[] unknown, int k, double distanceThreshold) {
 	public Neighbor[] distances(int[] unknown, double distanceThreshold) {
 		int curTokenRuleIndex = unknown[CollectFeatures.INDEX_RULE];
 		int prevTokenRuleIndex = unknown[CollectFeatures.INDEX_PREV_RULE];
-		Pair<Integer, Integer> key = new Pair<>(curTokenRuleIndex, prevTokenRuleIndex);
+		Pair<Integer, Integer> key = new Pair<>(prevTokenRuleIndex, curTokenRuleIndex);
 		List<Integer> vectorIndexesMatchingTokenContext = corpus.curAndPrevTokenRuleIndexToVectorsMap.get(key);
 		List<Neighbor> distances = new ArrayList<>();
 		if ( vectorIndexesMatchingTokenContext==null ) {