From ee6334bccf6d81b1bf513c44897e2a63b6300400 Mon Sep 17 00:00:00 2001
From: Matthias Sohn <matthias.sohn@sap.com>
Date: Tue, 6 Sep 2022 00:07:17 +0200
Subject: [PATCH] Revert "Option to pass start RevCommit to be blamed on to the
 BlameGenerator."

This reverts commit 5747bba48b22a11beba8ebe0caf13a53d4ca96f2.

This is done as a quick fix for the failure of egit tests caused by  the
introduction of FilteredRevCommit.

Bug: 580690
Change-Id: Ia0178bc2de4fc825a81207bbd7979bf3a386c955
---
 .../jgit/api/blame/BlameGeneratorTest.java    | 331 ++----------------
 .../eclipse/jgit/blame/BlameGenerator.java    |  47 +--
 2 files changed, 40 insertions(+), 338 deletions(-)

diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/api/blame/BlameGeneratorTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/api/blame/BlameGeneratorTest.java
index b175ead8e..f47f44737 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/api/blame/BlameGeneratorTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/api/blame/BlameGeneratorTest.java
@@ -13,330 +13,56 @@
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
 
-import java.util.Iterator;
-
 import org.eclipse.jgit.api.Git;
 import org.eclipse.jgit.blame.BlameGenerator;
 import org.eclipse.jgit.blame.BlameResult;
 import org.eclipse.jgit.junit.RepositoryTestCase;
 import org.eclipse.jgit.lib.Constants;
-import org.eclipse.jgit.merge.MergeStrategy;
-import org.eclipse.jgit.revwalk.FilteredRevCommit;
 import org.eclipse.jgit.revwalk.RevCommit;
-import org.eclipse.jgit.revwalk.RevWalk;
 import org.junit.Test;
 
 /** Unit tests of {@link BlameGenerator}. */
 public class BlameGeneratorTest extends RepositoryTestCase {
-
-	public static final String OTHER_FILE = "other_file.txt";
-
-	public static final String INTERESTING_FILE = "interesting_file.txt";
-
 	@Test
-	public void testSingleBlame() throws Exception {
-
-		/**
-		 * <pre>
-		 * (ts) 	OTHER_FILE			INTERESTING_FILE
-		 * 1 		a
-		 * 2	 	a, b
-		 * 3							1, 2				c1 <--
-		 * 4	 	a, b, c										 |
-		 * 5							1, 2, 3				c2---
-		 * </pre>
-		 */
-		try (Git git = new Git(db);
-				RevWalk revWalk = new RevWalk(git.getRepository())) {
-			writeTrashFile(OTHER_FILE, join("a"));
-			git.add().addFilepattern(OTHER_FILE).call();
-			git.commit().setMessage("create file").call();
-
-			writeTrashFile(OTHER_FILE, join("a", "b"));
-			git.add().addFilepattern(OTHER_FILE).call();
-			git.commit().setMessage("amend file").call();
-
-			writeTrashFile(INTERESTING_FILE, join("1", "2"));
-			git.add().addFilepattern(INTERESTING_FILE).call();
+	public void testBoundLineDelete() throws Exception {
+		try (Git git = new Git(db)) {
+			String[] content1 = new String[] { "first", "second" };
+			writeTrashFile("file.txt", join(content1));
+			git.add().addFilepattern("file.txt").call();
 			RevCommit c1 = git.commit().setMessage("create file").call();
 
-			writeTrashFile(OTHER_FILE, join("a", "b", "c"));
-			git.add().addFilepattern(OTHER_FILE).call();
-			git.commit().setMessage("amend file").call();
+			String[] content2 = new String[] { "third", "first", "second" };
+			writeTrashFile("file.txt", join(content2));
+			git.add().addFilepattern("file.txt").call();
+			RevCommit c2 = git.commit().setMessage("create file").call();
 
-			writeTrashFile(INTERESTING_FILE, join("1", "2", "3"));
-			git.add().addFilepattern(INTERESTING_FILE).call();
-			RevCommit c2 = git.commit().setMessage("amend file").call();
-
-			RevCommit filteredC1 = new FilteredRevCommit(c1);
-			RevCommit filteredC2 = new FilteredRevCommit(c2, filteredC1);
-
-			revWalk.parseHeaders(filteredC2);
-
-			try (BlameGenerator generator = new BlameGenerator(db,
-					INTERESTING_FILE)) {
-				generator.push(filteredC2);
+			try (BlameGenerator generator = new BlameGenerator(db, "file.txt")) {
+				generator.push(null, db.resolve(Constants.HEAD));
 				assertEquals(3, generator.getResultContents().size());
 
 				assertTrue(generator.next());
 				assertEquals(c2, generator.getSourceCommit());
 				assertEquals(1, generator.getRegionLength());
-				assertEquals(2, generator.getResultStart());
-				assertEquals(3, generator.getResultEnd());
-				assertEquals(2, generator.getSourceStart());
-				assertEquals(3, generator.getSourceEnd());
-				assertEquals(INTERESTING_FILE, generator.getSourcePath());
+				assertEquals(0, generator.getResultStart());
+				assertEquals(1, generator.getResultEnd());
+				assertEquals(0, generator.getSourceStart());
+				assertEquals(1, generator.getSourceEnd());
+				assertEquals("file.txt", generator.getSourcePath());
 
 				assertTrue(generator.next());
 				assertEquals(c1, generator.getSourceCommit());
 				assertEquals(2, generator.getRegionLength());
-				assertEquals(0, generator.getResultStart());
-				assertEquals(2, generator.getResultEnd());
-				assertEquals(0, generator.getSourceStart());
-				assertEquals(2, generator.getSourceEnd());
-				assertEquals(INTERESTING_FILE, generator.getSourcePath());
-
-				assertFalse(generator.next());
-			}
-		}
-	}
-
-	@Test
-	public void testMergeSingleBlame() throws Exception {
-		try (Git git = new Git(db);
-				RevWalk revWalk = new RevWalk(git.getRepository())) {
-
-			/**
-			 *
-			 *
-			 * <pre>
-			 *  refs/heads/master
-			 *      A
-			 *     / \       		 refs/heads/side
-			 *    /   ---------------->  side
-			 *   /                        |
-			 *  merge <-------------------
-			 * </pre>
-			 */
-
-			writeTrashFile(INTERESTING_FILE, join("1", "2"));
-			git.add().addFilepattern(INTERESTING_FILE).call();
-			RevCommit c1 = git.commit().setMessage("create file").call();
-
-			createBranch(c1, "refs/heads/side");
-			checkoutBranch("refs/heads/side");
-			writeTrashFile(INTERESTING_FILE, join("1", "2", "3", "4"));
-			git.add().addFilepattern(INTERESTING_FILE).call();
-			RevCommit sideCommit = git.commit()
-					.setMessage("amend file in another branch").call();
-
-			checkoutBranch("refs/heads/master");
-			git.merge().setMessage("merge").include(sideCommit)
-					.setStrategy(MergeStrategy.RESOLVE).call();
-
-			Iterator<RevCommit> it = git.log().call().iterator();
-			RevCommit mergeCommit = it.next();
-
-			RevCommit filteredC1 = new FilteredRevCommit(c1);
-			RevCommit filteredSide = new FilteredRevCommit(sideCommit,
-					filteredC1);
-			RevCommit filteredMerge = new FilteredRevCommit(mergeCommit,
-					filteredSide, filteredC1);
-
-			revWalk.parseHeaders(filteredMerge);
-
-			try (BlameGenerator generator = new BlameGenerator(db,
-					INTERESTING_FILE)) {
-				generator.push(filteredMerge);
-				assertEquals(4, generator.getResultContents().size());
-
-				assertTrue(generator.next());
-				assertEquals(mergeCommit, generator.getSourceCommit());
-				assertEquals(2, generator.getRegionLength());
-				assertEquals(2, generator.getResultStart());
-				assertEquals(4, generator.getResultEnd());
-				assertEquals(2, generator.getSourceStart());
-				assertEquals(4, generator.getSourceEnd());
-				assertEquals(INTERESTING_FILE, generator.getSourcePath());
-
-				assertTrue(generator.next());
-				assertEquals(filteredC1, generator.getSourceCommit());
-				assertEquals(2, generator.getRegionLength());
-				assertEquals(0, generator.getResultStart());
-				assertEquals(2, generator.getResultEnd());
-				assertEquals(0, generator.getSourceStart());
-				assertEquals(2, generator.getSourceEnd());
-				assertEquals(INTERESTING_FILE, generator.getSourcePath());
-
-				assertFalse(generator.next());
-			}
-		}
-	}
-
-	@Test
-	public void testMergeBlame() throws Exception {
-		try (Git git = new Git(db);
-				RevWalk revWalk = new RevWalk(git.getRepository())) {
-
-			/**
-			 *
-			 *
-			 * <pre>
-			 *  refs/heads/master
-			 *      A
-			 *     / \       		 refs/heads/side
-			 *    B   ---------------->  side
-			 *   /                        |
-			 *  merge <-------------------
-			 * </pre>
-			 */
-			writeTrashFile(INTERESTING_FILE, join("1", "2"));
-			git.add().addFilepattern(INTERESTING_FILE).call();
-			RevCommit c1 = git.commit().setMessage("create file").call();
-
-			createBranch(c1, "refs/heads/side");
-			checkoutBranch("refs/heads/side");
-			writeTrashFile(INTERESTING_FILE, join("1", "2", "3"));
-			git.add().addFilepattern(INTERESTING_FILE).call();
-			RevCommit sideCommit = git.commit().setMessage("amend file").call();
-
-			checkoutBranch("refs/heads/master");
-			writeTrashFile(INTERESTING_FILE, join("1", "2", "4"));
-			git.add().addFilepattern(INTERESTING_FILE).call();
-			RevCommit c2 = git.commit().setMessage("delete and amend file")
-					.call();
-
-			git.merge().setMessage("merge").include(sideCommit)
-					.setStrategy(MergeStrategy.RESOLVE).call();
-			writeTrashFile(INTERESTING_FILE, join("1", "2", "3", "4"));
-			git.add().addFilepattern(INTERESTING_FILE).call();
-			RevCommit mergeCommit = git.commit().setMessage("merge commit")
-					.call();
-
-			RevCommit filteredC1 = new FilteredRevCommit(c1);
-			RevCommit filteredSide = new FilteredRevCommit(sideCommit,
-					filteredC1);
-			RevCommit filteredC2 = new FilteredRevCommit(c2, filteredC1);
-
-			RevCommit filteredMerge = new FilteredRevCommit(mergeCommit,
-					filteredSide, filteredC2);
-
-			revWalk.parseHeaders(filteredMerge);
-
-			try (BlameGenerator generator = new BlameGenerator(db,
-					INTERESTING_FILE)) {
-				generator.push(filteredMerge);
-				assertEquals(4, generator.getResultContents().size());
-
-				assertTrue(generator.next());
-				assertEquals(filteredC2, generator.getSourceCommit());
-				assertEquals(1, generator.getRegionLength());
-				assertEquals(3, generator.getResultStart());
-				assertEquals(4, generator.getResultEnd());
-				assertEquals(2, generator.getSourceStart());
-				assertEquals(3, generator.getSourceEnd());
-				assertEquals(INTERESTING_FILE, generator.getSourcePath());
-
-				assertTrue(generator.next());
-				assertEquals(filteredSide, generator.getSourceCommit());
-				assertEquals(1, generator.getRegionLength());
-				assertEquals(2, generator.getResultStart());
+				assertEquals(1, generator.getResultStart());
 				assertEquals(3, generator.getResultEnd());
-				assertEquals(2, generator.getSourceStart());
-				assertEquals(3, generator.getSourceEnd());
-				assertEquals(INTERESTING_FILE, generator.getSourcePath());
-
-				assertTrue(generator.next());
-				assertEquals(filteredC1, generator.getSourceCommit());
-				assertEquals(2, generator.getRegionLength());
-				assertEquals(0, generator.getResultStart());
-				assertEquals(2, generator.getResultEnd());
 				assertEquals(0, generator.getSourceStart());
 				assertEquals(2, generator.getSourceEnd());
-				assertEquals(INTERESTING_FILE, generator.getSourcePath());
+				assertEquals("file.txt", generator.getSourcePath());
 
 				assertFalse(generator.next());
 			}
 		}
 	}
 
-	@Test
-	public void testSingleBlame_compareWithWalk() throws Exception {
-		/**
-		 * <pre>
-		 * (ts) 	OTHER_FILE			INTERESTING_FILE
-		 * 1 		a
-		 * 2	 	a, b
-		 * 3							1, 2				c1 <--
-		 * 4	 	a, b, c										 |
-		 * 6							3, 1, 2				c2---
-		 * </pre>
-		 */
-		try (Git git = new Git(db);
-				RevWalk revWalk = new RevWalk(git.getRepository())) {
-			writeTrashFile(OTHER_FILE, join("a"));
-			git.add().addFilepattern(OTHER_FILE).call();
-			git.commit().setMessage("create file").call();
-
-			writeTrashFile(OTHER_FILE, join("a", "b"));
-			git.add().addFilepattern(OTHER_FILE).call();
-			git.commit().setMessage("amend file").call();
-
-			writeTrashFile(INTERESTING_FILE, join("1", "2"));
-			git.add().addFilepattern(INTERESTING_FILE).call();
-			RevCommit c1 = git.commit().setMessage("create file").call();
-
-			writeTrashFile(OTHER_FILE, join("a", "b", "c"));
-			git.add().addFilepattern(OTHER_FILE).call();
-			git.commit().setMessage("amend file").call();
-
-			writeTrashFile(INTERESTING_FILE, join("3", "1", "2"));
-			git.add().addFilepattern(INTERESTING_FILE).call();
-			RevCommit c2 = git.commit().setMessage("prepend").call();
-
-			RevCommit filteredC1 = new FilteredRevCommit(c1);
-			RevCommit filteredC2 = new FilteredRevCommit(c2, filteredC1);
-
-			revWalk.parseHeaders(filteredC2);
-
-			try (BlameGenerator g1 = new BlameGenerator(db, INTERESTING_FILE);
-					BlameGenerator g2 = new BlameGenerator(db,
-							INTERESTING_FILE)) {
-				g1.push(null, c2);
-				g2.push(null, filteredC2);
-
-				assertEquals(g1.getResultContents().size(),
-						g2.getResultContents().size()); // 3
-
-				assertTrue(g1.next());
-				assertTrue(g2.next());
-
-				assertEquals(g1.getSourceCommit(), g2.getSourceCommit()); // c2
-				assertEquals(INTERESTING_FILE, g1.getSourcePath());
-				assertEquals(g1.getRegionLength(), g2.getRegionLength()); // 1
-				assertEquals(g1.getResultStart(), g2.getResultStart()); // 0
-				assertEquals(g1.getResultEnd(), g2.getResultEnd()); // 1
-				assertEquals(g1.getSourceStart(), g2.getSourceStart()); // 0
-				assertEquals(g1.getSourceEnd(), g2.getSourceEnd()); // 1
-				assertEquals(g1.getSourcePath(), g2.getSourcePath()); // INTERESTING_FILE
-
-				assertTrue(g1.next());
-				assertTrue(g2.next());
-
-				assertEquals(g1.getSourceCommit(), g2.getSourceCommit()); // c1
-				assertEquals(g1.getRegionLength(), g2.getRegionLength()); // 2
-				assertEquals(g1.getResultStart(), g2.getResultStart()); // 1
-				assertEquals(g1.getResultEnd(), g2.getResultEnd()); // 3
-				assertEquals(g1.getSourceStart(), g2.getSourceStart()); // 0
-				assertEquals(g1.getSourceEnd(), g2.getSourceEnd()); // 2
-				assertEquals(g1.getSourcePath(), g2.getSourcePath()); // INTERESTING_FILE
-
-				assertFalse(g1.next());
-				assertFalse(g2.next());
-			}
-		}
-	}
-
 	@Test
 	public void testRenamedBoundLineDelete() throws Exception {
 		try (Git git = new Git(db)) {
@@ -361,8 +87,7 @@ public void testRenamedBoundLineDelete() throws Exception {
 			git.add().addFilepattern(FILENAME_2).call();
 			RevCommit c2 = git.commit().setMessage("change file2").call();
 
-			try (BlameGenerator generator = new BlameGenerator(db,
-					FILENAME_2)) {
+			try (BlameGenerator generator = new BlameGenerator(db, FILENAME_2)) {
 				generator.push(null, db.resolve(Constants.HEAD));
 				assertEquals(3, generator.getResultContents().size());
 
@@ -388,8 +113,7 @@ public void testRenamedBoundLineDelete() throws Exception {
 			}
 
 			// and test again with other BlameGenerator API:
-			try (BlameGenerator generator = new BlameGenerator(db,
-					FILENAME_2)) {
+			try (BlameGenerator generator = new BlameGenerator(db, FILENAME_2)) {
 				generator.push(null, db.resolve(Constants.HEAD));
 				BlameResult result = generator.computeBlameResult();
 
@@ -412,22 +136,21 @@ public void testLinesAllDeletedShortenedWalk() throws Exception {
 		try (Git git = new Git(db)) {
 			String[] content1 = new String[] { "first", "second", "third" };
 
-			writeTrashFile(INTERESTING_FILE, join(content1));
-			git.add().addFilepattern(INTERESTING_FILE).call();
+			writeTrashFile("file.txt", join(content1));
+			git.add().addFilepattern("file.txt").call();
 			git.commit().setMessage("create file").call();
 
 			String[] content2 = new String[] { "" };
 
-			writeTrashFile(INTERESTING_FILE, join(content2));
-			git.add().addFilepattern(INTERESTING_FILE).call();
+			writeTrashFile("file.txt", join(content2));
+			git.add().addFilepattern("file.txt").call();
 			git.commit().setMessage("create file").call();
 
-			writeTrashFile(INTERESTING_FILE, join(content1));
-			git.add().addFilepattern(INTERESTING_FILE).call();
+			writeTrashFile("file.txt", join(content1));
+			git.add().addFilepattern("file.txt").call();
 			RevCommit c3 = git.commit().setMessage("create file").call();
 
-			try (BlameGenerator generator = new BlameGenerator(db,
-					INTERESTING_FILE)) {
+			try (BlameGenerator generator = new BlameGenerator(db, "file.txt")) {
 				generator.push(null, db.resolve(Constants.HEAD));
 				assertEquals(3, generator.getResultContents().size());
 
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/blame/BlameGenerator.java b/org.eclipse.jgit/src/org/eclipse/jgit/blame/BlameGenerator.java
index 93ddfc660..77967df2e 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/blame/BlameGenerator.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/blame/BlameGenerator.java
@@ -129,7 +129,6 @@ public class BlameGenerator implements AutoCloseable {
 
 	/** Blame is currently assigned to this source. */
 	private Candidate outCandidate;
-
 	private Region outRegion;
 
 	/**
@@ -396,35 +395,6 @@ private static byte[] getBytes(String path, InputStream in, long maxLength)
 		return copy;
 	}
 
-	/**
-	 * Push a candidate object onto the generator's traversal stack.
-	 * <p>
-	 * Candidates should be pushed in history order from oldest-to-newest.
-	 * Applications should push the starting commit first, then the index
-	 * revision (if the index is interesting), and finally the working tree copy
-	 * (if the working tree is interesting).
-	 *
-	 * @param blameCommit
-	 *            ordered commits to use instead of RevWalk.
-	 * @return {@code this}
-	 * @throws java.io.IOException
-	 *             the repository cannot be read.
-	 * @since 6.3
-	 */
-	public BlameGenerator push(RevCommit blameCommit) throws IOException {
-		if (!find(blameCommit, resultPath)) {
-			return this;
-		}
-
-		Candidate c = new Candidate(getRepository(), blameCommit, resultPath);
-		c.sourceBlob = idBuf.toObjectId();
-		c.loadText(reader);
-		c.regionList = new Region(0, 0, c.sourceText.size());
-		remaining = c.sourceText.size();
-		push(c);
-		return this;
-	}
-
 	/**
 	 * Push a candidate object onto the generator's traversal stack.
 	 * <p>
@@ -458,7 +428,16 @@ public BlameGenerator push(String description, AnyObjectId id)
 		}
 
 		RevCommit commit = revPool.parseCommit(id);
-		return push(commit);
+		if (!find(commit, resultPath))
+			return this;
+
+		Candidate c = new Candidate(getRepository(), commit, resultPath);
+		c.sourceBlob = idBuf.toObjectId();
+		c.loadText(reader);
+		c.regionList = new Region(0, 0, c.sourceText.size());
+		remaining = c.sourceText.size();
+		push(c);
+		return this;
 	}
 
 	/**
@@ -626,7 +605,7 @@ public boolean next() throws IOException {
 				// Do not generate a tip of a reverse. The region
 				// survives and should not appear to be deleted.
 
-			} else /* if (pCnt == 0) */ {
+			} else /* if (pCnt == 0) */{
 				// Root commit, with at least one surviving region.
 				// Assign the remaining blame here.
 				return result(n);
@@ -867,8 +846,8 @@ private boolean processMerge(Candidate n) throws IOException {
 				editList = new EditList(0);
 			} else {
 				p.loadText(reader);
-				editList = diffAlgorithm.diff(textComparator, p.sourceText,
-						n.sourceText);
+				editList = diffAlgorithm.diff(textComparator,
+						p.sourceText, n.sourceText);
 			}
 
 			if (editList.isEmpty()) {