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/*
* Copyright (C) 2025, Google LLC
*
* 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.storage.midx;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import java.util.Arrays;
import java.util.Iterator;
import java.util.Map;
import org.eclipse.jgit.internal.storage.file.PackIndex;
import org.eclipse.jgit.junit.FakeIndexFactory;
import org.eclipse.jgit.junit.FakeIndexFactory.IndexObject;
import org.junit.Test;
public class PackIndexMergerTest {
@Test
public void rawIterator_noDuplicates() {
PackIndex idxOne = indexOf(
oidOffset("0000000000000000000000000000000000000001", 500),
oidOffset("0000000000000000000000000000000000000005", 12),
oidOffset("0000000000000000000000000000000000000010", 1500));
PackIndex idxTwo = indexOf(
oidOffset("0000000000000000000000000000000000000002", 501),
oidOffset("0000000000000000000000000000000000000003", 13),
oidOffset("0000000000000000000000000000000000000015", 1501));
PackIndex idxThree = indexOf(
oidOffset("0000000000000000000000000000000000000004", 502),
oidOffset("0000000000000000000000000000000000000007", 14),
oidOffset("0000000000000000000000000000000000000012", 1502));
PackIndexMerger merger = new PackIndexMerger(
Map.of("p1", idxOne, "p2", idxTwo, "p3", idxThree));
assertEquals(9, merger.getUniqueObjectCount());
assertEquals(3, merger.getPackCount());
assertFalse(merger.needsLargeOffsetsChunk());
Iterator<PackIndexMerger.MidxMutableEntry> it = merger.rawIterator();
assertNextEntry(it, "0000000000000000000000000000000000000001", 0, 500);
assertNextEntry(it, "0000000000000000000000000000000000000002", 1, 501);
assertNextEntry(it, "0000000000000000000000000000000000000003", 1, 13);
assertNextEntry(it, "0000000000000000000000000000000000000004", 2, 502);
assertNextEntry(it, "0000000000000000000000000000000000000005", 0, 12);
assertNextEntry(it, "0000000000000000000000000000000000000007", 2, 14);
assertNextEntry(it, "0000000000000000000000000000000000000010", 0,
1500);
assertNextEntry(it, "0000000000000000000000000000000000000012", 2,
1502);
assertNextEntry(it, "0000000000000000000000000000000000000015", 1,
1501);
assertFalse(it.hasNext());
}
@Test
public void rawIterator_allDuplicates() {
PackIndex idxOne = indexOf(
oidOffset("0000000000000000000000000000000000000001", 500),
oidOffset("0000000000000000000000000000000000000005", 12),
oidOffset("0000000000000000000000000000000000000010", 1500));
PackIndexMerger merger = new PackIndexMerger(
Map.of("p1", idxOne, "p2", idxOne, "p3", idxOne));
assertEquals(3, merger.getUniqueObjectCount());
assertEquals(3, merger.getPackCount());
assertFalse(merger.needsLargeOffsetsChunk());
Iterator<PackIndexMerger.MidxMutableEntry> it = merger.rawIterator();
assertNextEntry(it, "0000000000000000000000000000000000000001", 0, 500);
assertNextEntry(it, "0000000000000000000000000000000000000001", 1, 500);
assertNextEntry(it, "0000000000000000000000000000000000000001", 2, 500);
assertNextEntry(it, "0000000000000000000000000000000000000005", 0, 12);
assertNextEntry(it, "0000000000000000000000000000000000000005", 1, 12);
assertNextEntry(it, "0000000000000000000000000000000000000005", 2, 12);
assertNextEntry(it, "0000000000000000000000000000000000000010", 0,
1500);
assertNextEntry(it, "0000000000000000000000000000000000000010", 1,
1500);
assertNextEntry(it, "0000000000000000000000000000000000000010", 2,
1500);
assertFalse(it.hasNext());
}
@Test
public void bySha1Iterator_noDuplicates() {
PackIndex idxOne = indexOf(
oidOffset("0000000000000000000000000000000000000001", 500),
oidOffset("0000000000000000000000000000000000000005", 12),
oidOffset("0000000000000000000000000000000000000010", 1500));
PackIndex idxTwo = indexOf(
oidOffset("0000000000000000000000000000000000000002", 501),
oidOffset("0000000000000000000000000000000000000003", 13),
oidOffset("0000000000000000000000000000000000000015", 1501));
PackIndex idxThree = indexOf(
oidOffset("0000000000000000000000000000000000000004", 502),
oidOffset("0000000000000000000000000000000000000007", 14),
oidOffset("0000000000000000000000000000000000000012", 1502));
PackIndexMerger merger = new PackIndexMerger(
Map.of("p1", idxOne, "p2", idxTwo, "p3", idxThree));
assertEquals(9, merger.getUniqueObjectCount());
assertEquals(3, merger.getPackCount());
assertFalse(merger.needsLargeOffsetsChunk());
Iterator<PackIndexMerger.MidxMutableEntry> it = merger.bySha1Iterator();
assertNextEntry(it, "0000000000000000000000000000000000000001", 0, 500);
assertNextEntry(it, "0000000000000000000000000000000000000002", 1, 501);
assertNextEntry(it, "0000000000000000000000000000000000000003", 1, 13);
assertNextEntry(it, "0000000000000000000000000000000000000004", 2, 502);
assertNextEntry(it, "0000000000000000000000000000000000000005", 0, 12);
assertNextEntry(it, "0000000000000000000000000000000000000007", 2, 14);
assertNextEntry(it, "0000000000000000000000000000000000000010", 0,
1500);
assertNextEntry(it, "0000000000000000000000000000000000000012", 2,
1502);
assertNextEntry(it, "0000000000000000000000000000000000000015", 1,
1501);
assertFalse(it.hasNext());
}
@Test
public void bySha1Iterator_allDuplicates() {
PackIndex idxOne = indexOf(
oidOffset("0000000000000000000000000000000000000001", 500),
oidOffset("0000000000000000000000000000000000000005", 12),
oidOffset("0000000000000000000000000000000000000010", 1500));
PackIndexMerger merger = new PackIndexMerger(
Map.of("p1", idxOne, "p2", idxOne, "p3", idxOne));
assertEquals(3, merger.getUniqueObjectCount());
assertEquals(3, merger.getPackCount());
assertFalse(merger.needsLargeOffsetsChunk());
Iterator<PackIndexMerger.MidxMutableEntry> it = merger.bySha1Iterator();
assertNextEntry(it, "0000000000000000000000000000000000000001", 0, 500);
assertNextEntry(it, "0000000000000000000000000000000000000005", 0, 12);
assertNextEntry(it, "0000000000000000000000000000000000000010", 0,
1500);
assertFalse(it.hasNext());
}
@Test
public void bySha1Iterator_differentIndexSizes() {
PackIndex idxOne = indexOf(
oidOffset("0000000000000000000000000000000000000010", 1500));
PackIndex idxTwo = indexOf(
oidOffset("0000000000000000000000000000000000000002", 500),
oidOffset("0000000000000000000000000000000000000003", 12));
PackIndex idxThree = indexOf(
oidOffset("0000000000000000000000000000000000000004", 500),
oidOffset("0000000000000000000000000000000000000007", 12),
oidOffset("0000000000000000000000000000000000000012", 1500));
PackIndexMerger merger = new PackIndexMerger(
Map.of("p1", idxOne, "p2", idxTwo, "p3", idxThree));
assertEquals(6, merger.getUniqueObjectCount());
assertEquals(3, merger.getPackCount());
assertFalse(merger.needsLargeOffsetsChunk());
Iterator<PackIndexMerger.MidxMutableEntry> it = merger.bySha1Iterator();
assertNextEntry(it, "0000000000000000000000000000000000000002", 1, 500);
assertNextEntry(it, "0000000000000000000000000000000000000003", 1, 12);
assertNextEntry(it, "0000000000000000000000000000000000000004", 2, 500);
assertNextEntry(it, "0000000000000000000000000000000000000007", 2, 12);
assertNextEntry(it, "0000000000000000000000000000000000000010", 0,
1500);
assertNextEntry(it, "0000000000000000000000000000000000000012", 2,
1500);
assertFalse(it.hasNext());
}
@Test
public void merger_noIndexes() {
PackIndexMerger merger = new PackIndexMerger(Map.of());
assertEquals(0, merger.getUniqueObjectCount());
assertFalse(merger.needsLargeOffsetsChunk());
assertTrue(merger.getPackNames().isEmpty());
assertEquals(0, merger.getPackCount());
assertFalse(merger.bySha1Iterator().hasNext());
}
@Test
public void merger_emptyIndexes() {
PackIndexMerger merger = new PackIndexMerger(
Map.of("p1", indexOf(), "p2", indexOf()));
assertEquals(0, merger.getUniqueObjectCount());
assertFalse(merger.needsLargeOffsetsChunk());
assertEquals(2, merger.getPackNames().size());
assertEquals(2, merger.getPackCount());
assertFalse(merger.bySha1Iterator().hasNext());
}
@Test
public void bySha1Iterator_largeOffsets_needsChunk() {
PackIndex idx1 = indexOf(
oidOffset("0000000000000000000000000000000000000002", 1L << 32),
oidOffset("0000000000000000000000000000000000000004", 12));
PackIndex idx2 = indexOf(oidOffset(
"0000000000000000000000000000000000000003", (1L << 31) + 10));
PackIndexMerger merger = new PackIndexMerger(
Map.of("p1", idx1, "p2", idx2));
assertTrue(merger.needsLargeOffsetsChunk());
assertEquals(2, merger.getOffsetsOver31BitsCount());
assertEquals(3, merger.getUniqueObjectCount());
}
@Test
public void bySha1Iterator_largeOffsets_noChunk() {
// If no value is over 2^32-1, then we don't need large offset
PackIndex idx1 = indexOf(
oidOffset("0000000000000000000000000000000000000002",
(1L << 31) + 15),
oidOffset("0000000000000000000000000000000000000004", 12));
PackIndex idx2 = indexOf(oidOffset(
"0000000000000000000000000000000000000003", (1L << 31) + 10));
PackIndexMerger merger = new PackIndexMerger(
Map.of("p1", idx1, "p2", idx2));
assertFalse(merger.needsLargeOffsetsChunk());
assertEquals(2, merger.getOffsetsOver31BitsCount());
assertEquals(3, merger.getUniqueObjectCount());
}
private static void assertNextEntry(
Iterator<PackIndexMerger.MidxMutableEntry> it, String oid,
int packId, long offset) {
assertTrue(it.hasNext());
PackIndexMerger.MidxMutableEntry e = it.next();
assertEquals(oid, e.getObjectId().name());
assertEquals(packId, e.getPackId());
assertEquals(offset, e.getOffset());
}
private static IndexObject oidOffset(String oid, long offset) {
return new IndexObject(oid, offset);
}
private static PackIndex indexOf(IndexObject... objs) {
return FakeIndexFactory.indexOf(Arrays.asList(objs));
}
}
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