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// Copyright (C) 2009 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package com.google.gerrit.server.patch;
import static com.google.gerrit.server.ioutil.BasicSerialization.readBytes;
import static com.google.gerrit.server.ioutil.BasicSerialization.readVarInt32;
import static com.google.gerrit.server.ioutil.BasicSerialization.writeBytes;
import static com.google.gerrit.server.ioutil.BasicSerialization.writeVarInt32;
import static org.eclipse.jgit.lib.ObjectIdSerializer.read;
import static org.eclipse.jgit.lib.ObjectIdSerializer.readWithoutMarker;
import static org.eclipse.jgit.lib.ObjectIdSerializer.write;
import static org.eclipse.jgit.lib.ObjectIdSerializer.writeWithoutMarker;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.collect.ImmutableList;
import com.google.gerrit.common.Nullable;
import com.google.gerrit.entities.Patch;
import com.google.gerrit.entities.Patch.ChangeType;
import com.google.gerrit.git.ObjectIds;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.zip.DeflaterOutputStream;
import java.util.zip.InflaterInputStream;
import org.eclipse.jgit.lib.AnyObjectId;
import org.eclipse.jgit.lib.ObjectId;
public class PatchList implements Serializable {
private static final long serialVersionUID = PatchListKey.serialVersionUID;
@VisibleForTesting
static final Comparator FILE_PATH_CMP =
Comparator.comparing(Patch::isMagic).reversed().thenComparing(Comparator.naturalOrder());
/**
* We use the ChangeType comparator for a rare case when PatchList contains two entries for the
* same file, e.g. {ADDED, DELETED}. We return a single entry according to the following order.
* Check the following bug for an example case:
* https://issues.gerritcodereview.com/issues/40013315.
*/
@VisibleForTesting
static class ChangeTypeCmp implements Comparator {
static final ImmutableList order =
ImmutableList.of(
ChangeType.ADDED,
ChangeType.RENAMED,
ChangeType.MODIFIED,
ChangeType.COPIED,
ChangeType.REWRITE,
ChangeType.DELETED);
@Override
public int compare(ChangeType o1, ChangeType o2) {
int idx1 = priority(o1);
int idx2 = priority(o2);
return idx1 - idx2;
}
private int priority(ChangeType changeType) {
int idx = order.indexOf(changeType);
// Return least priority if the element is not in the order list.
return idx == -1 ? order.size() : idx;
}
}
@VisibleForTesting static final Comparator CHANGE_TYPE_CMP = new ChangeTypeCmp();
private static final Comparator PATCH_CMP =
Comparator.comparing(PatchListEntry::getNewName, FILE_PATH_CMP)
.thenComparing(PatchListEntry::getChangeType, CHANGE_TYPE_CMP);
@Nullable private transient ObjectId oldId;
private transient ObjectId newId;
private transient boolean isMerge;
private transient ComparisonType comparisonType;
private transient int insertions;
private transient int deletions;
private transient PatchListEntry[] patches;
public PatchList(
@Nullable AnyObjectId oldId,
AnyObjectId newId,
boolean isMerge,
ComparisonType comparisonType,
PatchListEntry[] patches) {
this.oldId = ObjectIds.copyOrNull(oldId);
this.newId = newId.copy();
this.isMerge = isMerge;
this.comparisonType = comparisonType;
Arrays.sort(patches, 0, patches.length, PATCH_CMP);
// Skip magic files
int i = 0;
for (; i < patches.length; i++) {
if (!Patch.isMagic(patches[i].getNewName())) {
break;
}
}
for (; i < patches.length; i++) {
insertions += patches[i].getInsertions();
deletions += patches[i].getDeletions();
}
this.patches = patches;
}
/** Old side tree or commit; null only if this is a combined diff. */
@Nullable
public ObjectId getOldId() {
return oldId;
}
/** New side commit. */
public ObjectId getNewId() {
return newId;
}
/** Get a sorted, unmodifiable list of all files in this list. */
public List getPatches() {
return Collections.unmodifiableList(Arrays.asList(patches));
}
/** Returns the comparison type */
public ComparisonType getComparisonType() {
return comparisonType;
}
/** Returns total number of new lines added. */
public int getInsertions() {
return insertions;
}
/** Returns total number of lines removed. */
public int getDeletions() {
return deletions;
}
/** Find an entry by name, returning an empty entry if not present. */
public PatchListEntry get(String fileName) {
int index = search(fileName);
if (index >= 0) {
return patches[index];
}
// If index is negative, it marks the insertion point of the object in the list.
// index = (-(insertion point) - 1).
// Since we use the ChangeType in the comparison, the object that we are using in the lookup
// (which has a ADDED ChangeType) may have a different ChangeType than the object in the list.
// For this reason, we look at the file name of the object at the insertion point and return it
// if it has the same name.
index = -1 * (index + 1);
if (index < patches.length && patches[index].getNewName().equals(fileName)) {
return patches[index];
}
return PatchListEntry.empty(fileName);
}
private int search(String fileName) {
PatchListEntry want = PatchListEntry.empty(fileName, ChangeType.ADDED);
return Arrays.binarySearch(patches, 0, patches.length, want, PATCH_CMP);
}
private void writeObject(ObjectOutputStream output) throws IOException {
final ByteArrayOutputStream buf = new ByteArrayOutputStream();
try (DeflaterOutputStream out = new DeflaterOutputStream(buf)) {
write(out, oldId);
writeWithoutMarker(out, newId);
writeVarInt32(out, isMerge ? 1 : 0);
comparisonType.writeTo(out);
writeVarInt32(out, insertions);
writeVarInt32(out, deletions);
writeVarInt32(out, patches.length);
for (PatchListEntry p : patches) {
p.writeTo(out);
}
}
writeBytes(output, buf.toByteArray());
}
private void readObject(ObjectInputStream input) throws IOException {
final ByteArrayInputStream buf = new ByteArrayInputStream(readBytes(input));
try (InflaterInputStream in = new InflaterInputStream(buf)) {
oldId = read(in);
newId = readWithoutMarker(in);
isMerge = readVarInt32(in) != 0;
comparisonType = ComparisonType.readFrom(in);
insertions = readVarInt32(in);
deletions = readVarInt32(in);
final int cnt = readVarInt32(in);
final PatchListEntry[] all = new PatchListEntry[cnt];
for (int i = 0; i < all.length; i++) {
all[i] = PatchListEntry.readFrom(in);
}
patches = all;
}
}
}
