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/*
* Copyright (C) 2022, 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.storage.file;
import static org.eclipse.jgit.lib.Constants.OBJECT_ID_STRING_LENGTH;
import static org.eclipse.jgit.lib.Constants.OBJ_BLOB;
import static org.eclipse.jgit.lib.Constants.OBJ_COMMIT;
import static org.eclipse.jgit.lib.Constants.OBJ_TREE;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertThrows;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.transport.PackedObjectInfo;
import org.junit.Test;
public class PackReverseIndexV1WriteReadTest {
private static byte[] PACK_CHECKSUM = new byte[] { 'P', 'A', 'C', 'K', 'C',
'H', 'E', 'C', 'K', 'S', 'U', 'M', '3', '4', '5', '6', '7', '8',
'9', '0', };
@Test
public void writeThenRead_noObjects() throws IOException {
ByteArrayOutputStream out = new ByteArrayOutputStream();
PackReverseIndexWriter writer = PackReverseIndexWriter.createWriter(out,
1);
List<PackedObjectInfo> objectsSortedByName = new ArrayList<>();
// write
writer.write(objectsSortedByName, PACK_CHECKSUM);
ByteArrayInputStream in = new ByteArrayInputStream(out.toByteArray());
// read
PackReverseIndex noObjectsReverseIndex = PackReverseIndexFactory
.readFromFile(in, 0, () -> null);
// use
assertThrows(AssertionError.class,
() -> noObjectsReverseIndex.findObjectByPosition(0));
}
@Test
public void writeThenRead_oneObject() throws IOException {
ByteArrayOutputStream out = new ByteArrayOutputStream();
PackReverseIndexWriter writer = PackReverseIndexWriter.createWriter(out,
1);
PackedObjectInfo a = objectInfo("a", OBJ_COMMIT, 0);
List<PackedObjectInfo> objectsSortedByName = List.of(a);
// write
writer.write(objectsSortedByName, PACK_CHECKSUM);
ByteArrayInputStream in = new ByteArrayInputStream(out.toByteArray());
PackIndex mockForwardIndex = mock(PackIndex.class);
when(mockForwardIndex.getObjectId(0)).thenReturn(a);
// read
PackReverseIndex oneObjectReverseIndex = PackReverseIndexFactory
.readFromFile(in, 1, () -> mockForwardIndex);
// use
assertEquals(a, oneObjectReverseIndex.findObjectByPosition(0));
}
@Test
public void writeThenRead_multipleObjectsLargeOffsets() throws IOException {
ByteArrayOutputStream out = new ByteArrayOutputStream();
PackReverseIndexWriter writer = PackReverseIndexWriter.createWriter(out,
1);
PackedObjectInfo a = objectInfo("a", OBJ_BLOB, 200000000);
PackedObjectInfo b = objectInfo("b", OBJ_COMMIT, 0);
PackedObjectInfo c = objectInfo("c", OBJ_COMMIT, 52000000000L);
PackedObjectInfo d = objectInfo("d", OBJ_TREE, 7);
PackedObjectInfo e = objectInfo("e", OBJ_COMMIT, 38000000000L);
List<PackedObjectInfo> objectsSortedByName = List.of(a, b, c, d, e);
writer.write(objectsSortedByName, PACK_CHECKSUM);
// write
writer.write(objectsSortedByName, PACK_CHECKSUM);
ByteArrayInputStream in = new ByteArrayInputStream(out.toByteArray());
PackIndex mockForwardIndex = mock(PackIndex.class);
when(mockForwardIndex.getObjectId(4)).thenReturn(e);
// read
PackReverseIndex multipleObjectsReverseIndex = PackReverseIndexFactory
.readFromFile(in, 5, () -> mockForwardIndex);
// use with minimal mocked forward index use
assertEquals(e, multipleObjectsReverseIndex.findObjectByPosition(3));
}
private static PackedObjectInfo objectInfo(String objectId, int type,
long offset) {
assert (objectId.length() == 1);
PackedObjectInfo objectInfo = new PackedObjectInfo(
ObjectId.fromString(objectId.repeat(OBJECT_ID_STRING_LENGTH)));
objectInfo.setType(type);
objectInfo.setOffset(offset);
return objectInfo;
}
}
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