Process consecutive line comments in groups, as if they were one comment

src/main/java/gr/uom/java/xmi/UMLCommentGroup.java

@@ -0,0 +1,38 @@
+package gr.uom.java.xmi;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Objects;
+
+public class UMLCommentGroup {
+	private List<UMLComment> group;
+
+	public UMLCommentGroup() {
+		this.group = new ArrayList<UMLComment>();
+	}
+
+	public UMLCommentGroup(List<UMLComment> group) {
+		this.group = group;
+	}
+
+	public void addComment(UMLComment c) {
+		group.add(c);
+	}
+
+	public List<UMLComment> getGroup() {
+		return group;
+	}
+
+	public boolean sameText(UMLCommentGroup other) {
+		if(this.group.size() == other.group.size()) {
+			int matches = 0;
+			for(int i=0; i<this.group.size(); i++) {
+				if(this.group.get(i).getText().equals(other.group.get(i).getText())) {
+					matches++;
+				}
+			}
+			return matches == this.group.size();
+		}
+		return false;
+	}
+}

src/main/java/gr/uom/java/xmi/diff/UMLCommentListDiff.java

@@ -10,6 +10,8 @@
 import org.apache.commons.lang3.tuple.Pair;
 
 import gr.uom.java.xmi.UMLComment;
+import gr.uom.java.xmi.UMLCommentGroup;
+import gr.uom.java.xmi.LocationInfo.CodeElementType;
 
 public class UMLCommentListDiff {
 	private List<Pair<UMLComment, UMLComment>> commonComments;
@@ -21,6 +23,30 @@ public UMLCommentListDiff(List<UMLComment> commentsBefore, List<UMLComment> comm
 		this.commonComments = new ArrayList<Pair<UMLComment,UMLComment>>();
 		this.deletedComments = new ArrayList<UMLComment>();
 		this.addedComments = new ArrayList<UMLComment>();
+		List<UMLComment> deletedComments = new ArrayList<UMLComment>(commentsBefore);
+		List<UMLComment> addedComments = new ArrayList<UMLComment>(commentsAfter);
+		//check if there exist comment groups, consecutive line comments
+		List<UMLCommentGroup> groupsBefore = createCommentGroups(commentsBefore);
+		List<UMLCommentGroup> groupsAfter = createCommentGroups(commentsAfter);
+		for(UMLCommentGroup groupBefore : groupsBefore) {
+			for(UMLCommentGroup groupAfter : groupsAfter) {
+				if(groupBefore.sameText(groupAfter)) {
+					for(int i=0; i<groupBefore.getGroup().size(); i++) {
+						UMLComment commentBefore = groupBefore.getGroup().get(i);
+						UMLComment commentAfter = groupAfter.getGroup().get(i);
+						Pair<UMLComment, UMLComment> pair = Pair.of(commentBefore, commentAfter);
+						commonComments.add(pair);
+						deletedComments.remove(commentBefore);
+						addedComments.remove(commentAfter);
+					}
+					break;
+				}
+			}
+		}
+		processRemainingComments(deletedComments, addedComments);
+	}
+
+	private void processRemainingComments(List<UMLComment> commentsBefore, List<UMLComment> commentsAfter) {
 		List<UMLComment> deletedComments = new ArrayList<UMLComment>(commentsBefore);
 		List<UMLComment> addedComments = new ArrayList<UMLComment>(commentsAfter);
 		if(commentsBefore.size() <= commentsAfter.size()) {
@@ -54,6 +80,37 @@ public UMLCommentListDiff(List<UMLComment> commentsBefore, List<UMLComment> comm
 		processModifiedComments(deletedComments, addedComments);
 	}
 
+	private List<UMLCommentGroup> createCommentGroups(List<UMLComment> commentsBefore) {
+		List<UMLCommentGroup> groups = new ArrayList<UMLCommentGroup>();
+		UMLCommentGroup currentGroup = new UMLCommentGroup();
+		for(int i=0; i<commentsBefore.size(); i++) {
+			UMLComment current = commentsBefore.get(i);
+			if(current.getLocationInfo().getCodeElementType().equals(CodeElementType.LINE_COMMENT)) {
+				if(i-1 >= 0) {
+					UMLComment previous = commentsBefore.get(i-1);
+					if(previous.getLocationInfo().getCodeElementType().equals(CodeElementType.LINE_COMMENT)) {
+						if(previous.getLocationInfo().getStartLine() + 1 == current.getLocationInfo().getStartLine()) {
+							//consecutive line comments
+							currentGroup.addComment(current);
+						}
+						else {
+							//make new group
+							groups.add(new UMLCommentGroup(currentGroup.getGroup()));
+							currentGroup = new UMLCommentGroup();
+							currentGroup.addComment(current);
+						}
+					}
+				}
+				else {
+					//this is the first line comment
+					currentGroup.addComment(current);
+				}
+			}
+		}
+		groups.add(currentGroup);
+		return groups;
+	}
+
 	private List<Integer> findAllMatchingIndices(List<UMLComment> fragments, UMLComment comment) {
 		List<Integer> matchingIndices = new ArrayList<>();
 		for(int i=0; i<fragments.size(); i++) {