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/*
* Copyright (C) 2020, Google LLC and others
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Distribution License v. 1.0 which is available at
* https://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
package org.eclipse.jgit.internal.revwalk;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import java.util.Arrays;
import java.util.Optional;
import java.util.stream.Stream;
import org.eclipse.jgit.internal.storage.file.FileRepository;
import org.eclipse.jgit.junit.LocalDiskRepositoryTestCase;
import org.eclipse.jgit.junit.TestRepository;
import org.eclipse.jgit.junit.TestRepository.CommitBuilder;
import org.eclipse.jgit.revwalk.ObjectReachabilityChecker;
import org.eclipse.jgit.revwalk.RevBlob;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.jgit.revwalk.RevObject;
import org.junit.Before;
import org.junit.Test;
public abstract class ObjectReachabilityTestCase
extends LocalDiskRepositoryTestCase {
private TestRepository<FileRepository> repo;
private AddressableRevCommit baseCommit;
private AddressableRevCommit branchACommit;
private AddressableRevCommit branchBCommit;
private AddressableRevCommit mergeCommit;
abstract ObjectReachabilityChecker getChecker(
TestRepository<FileRepository> repository) throws Exception;
// Pair of commit and blob inside it
protected static class AddressableRevCommit {
RevCommit commit;
RevBlob blob;
AddressableRevCommit(RevCommit commit, RevBlob blob) {
this.commit = commit;
this.blob = blob;
}
}
@Override
@Before
public void setUp() throws Exception {
super.setUp();
FileRepository db = createWorkRepository();
repo = new TestRepository<>(db);
prepareRepo();
}
@Test
public void blob_in_base_reachable_from_branches() throws Exception {
ObjectReachabilityChecker checker = getChecker(repo);
RevObject baseBlob = baseCommit.blob;
assertReachable("reachable from one branch", checker.areAllReachable(
Arrays.asList(baseBlob), Stream.of(branchACommit.commit)));
assertReachable("reachable from another branch",
checker.areAllReachable(
Arrays.asList(baseBlob),
Stream.of(branchBCommit.commit)));
}
@Test
public void blob_reachable_from_owning_commit() throws Exception {
ObjectReachabilityChecker checker = getChecker(repo);
RevObject branchABlob = branchACommit.blob;
assertReachable("reachable from itself",
checker.areAllReachable(Arrays.asList(branchABlob),
Stream.of(branchACommit.commit)));
}
@Test
public void blob_in_branch_reachable_from_merge() throws Exception {
ObjectReachabilityChecker checker = getChecker(repo);
RevObject branchABlob = branchACommit.blob;
assertReachable("reachable from merge", checker.areAllReachable(
Arrays.asList(branchABlob), Stream.of(mergeCommit.commit)));
}
@Test
public void blob_unreachable_from_earlier_commit() throws Exception {
ObjectReachabilityChecker checker = getChecker(repo);
RevObject branchABlob = branchACommit.blob;
assertUnreachable("unreachable from earlier commit",
checker.areAllReachable(Arrays.asList(branchABlob),
Stream.of(baseCommit.commit)));
}
@Test
public void blob_unreachable_from_parallel_branch() throws Exception {
ObjectReachabilityChecker checker = getChecker(repo);
RevObject branchABlob = branchACommit.blob;
assertUnreachable("unreachable from another branch",
checker.areAllReachable(Arrays.asList(branchABlob),
Stream.of(branchBCommit.commit)));
}
private void prepareRepo() throws Exception {
baseCommit = createCommit("base");
branchACommit = createCommit("branchA", baseCommit);
branchBCommit = createCommit("branchB", baseCommit);
mergeCommit = createCommit("merge", branchACommit, branchBCommit);
// Bitmaps are generated from references
repo.update("refs/heads/a", branchACommit.commit);
repo.update("refs/heads/b", branchBCommit.commit);
repo.update("refs/heads/merge", mergeCommit.commit);
}
private AddressableRevCommit createCommit(String blobPath, AddressableRevCommit... parents) throws Exception {
RevBlob blob = repo.blob(blobPath + " content");
CommitBuilder commitBuilder = repo.commit();
for (int i = 0; i < parents.length; i++) {
commitBuilder.parent(parents[i].commit);
}
commitBuilder.add(blobPath, blob);
RevCommit commit = commitBuilder.create();
return new AddressableRevCommit(commit, blob);
}
private static void assertReachable(String msg, Optional<RevObject> result) {
assertFalse(msg, result.isPresent());
}
private static void assertUnreachable(String msg, Optional<RevObject> result) {
assertTrue(msg, result.isPresent());
}
}
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