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/*
* Copyright (C) 2012, Marc Strapetz <marc.strapetz@syntevo.com> 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.revwalk;
import static org.junit.Assert.assertNull;
import java.io.File;
import java.io.IOException;
import org.eclipse.jgit.junit.JGitTestUtil;
import org.eclipse.jgit.lib.ObjectId;
import org.junit.Test;
public class RevWalkShallowTest extends RevWalkTestCase {
// Accessing ==============================================================
@Test
public void testDepth1() throws Exception {
RevCommit[] commits = setupLinearChain();
createShallowFile(commits[3]);
updateCommits(commits);
rw.markStart(commits[3]);
assertCommit(commits[3], rw.next());
assertNull(rw.next());
}
@Test
public void testDepth2() throws Exception {
RevCommit[] commits = setupLinearChain();
createShallowFile(commits[2]);
updateCommits(commits);
rw.markStart(commits[3]);
assertCommit(commits[3], rw.next());
assertCommit(commits[2], rw.next());
assertNull(rw.next());
}
@Test
public void testDepth3() throws Exception {
RevCommit[] commits = setupLinearChain();
createShallowFile(commits[1]);
updateCommits(commits);
rw.markStart(commits[3]);
assertCommit(commits[3], rw.next());
assertCommit(commits[2], rw.next());
assertCommit(commits[1], rw.next());
assertNull(rw.next());
}
@Test
public void testObjectDirectorySnapshot() throws Exception {
RevCommit[] commits = setupLinearChain();
createShallowFile(commits[3]);
updateCommits(commits);
markStart(commits[3]);
assertCommit(commits[3], rw.next());
assertNull(rw.next());
createShallowFile(commits[2]);
updateCommits(commits);
markStart(commits[3]);
assertCommit(commits[3], rw.next());
assertCommit(commits[2], rw.next());
assertNull(rw.next());
}
private RevCommit[] setupLinearChain() throws Exception {
RevCommit[] commits = new RevCommit[4];
RevCommit parent = null;
for (int i = 0; i < commits.length; i++) {
commits[i] = parent != null ? commit(parent) : commit();
parent = commits[i];
}
return commits;
}
@Test
public void testMergeCommitOneParentShallow() throws Exception {
RevCommit[] commits = setupMergeChain();
createShallowFile(commits[4]);
updateCommits(commits);
markStart(commits[5]);
assertCommit(commits[5], rw.next());
assertCommit(commits[4], rw.next());
assertCommit(commits[2], rw.next());
assertCommit(commits[1], rw.next());
assertCommit(commits[0], rw.next());
assertNull(rw.next());
}
@Test
public void testMergeCommitEntirelyShallow() throws Exception {
RevCommit[] commits = setupMergeChain();
createShallowFile(commits[2], commits[4]);
updateCommits(commits);
markStart(commits[5]);
assertCommit(commits[5], rw.next());
assertCommit(commits[4], rw.next());
assertCommit(commits[2], rw.next());
assertNull(rw.next());
}
private RevCommit[] setupMergeChain() throws Exception {
/*-
* Create a history like this, diverging at 1 and merging at 5:
*
* ---o--o commits 3,4
* / \
* o--o--o------o commits 0,1,2,5
*/
RevCommit[] commits = new RevCommit[6];
commits[0] = commit();
commits[1] = commit(commits[0]);
commits[2] = commit(commits[1]);
commits[3] = commit(commits[1]);
commits[4] = commit(commits[3]);
commits[5] = commit(commits[2], commits[4]);
return commits;
}
private void updateCommits(RevCommit[] commits) {
// Relookup commits using the new RevWalk
for (int i = 0; i < commits.length; i++) {
commits[i] = rw.lookupCommit(commits[i].getId());
}
}
private void createShallowFile(ObjectId... shallowCommits)
throws IOException {
// Reset the RevWalk since the new shallow file invalidates the existing
// RevWalk's shallow state.
rw.close();
rw = createRevWalk();
StringBuilder builder = new StringBuilder();
for (ObjectId commit : shallowCommits) {
builder.append(commit.getName() + "\n");
}
JGitTestUtil.write(new File(db.getDirectory(), "shallow"),
builder.toString());
}
@Test
public void testShallowCommitParse() throws Exception {
RevCommit a = commit();
RevCommit b = commit(a);
createShallowFile(b);
rw.close();
rw = createRevWalk();
b = rw.parseCommit(b);
markStart(b);
assertCommit(b, rw.next());
assertNull(rw.next());
}
}
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