// 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.ObjectIdSerialization.readCanBeNull;
import static org.eclipse.jgit.lib.ObjectIdSerialization.readNotNull;
import static org.eclipse.jgit.lib.ObjectIdSerialization.writeCanBeNull;
import static org.eclipse.jgit.lib.ObjectIdSerialization.writeNotNull;
import com.google.gerrit.common.Nullable;
import com.google.gerrit.reviewdb.client.Patch;
import com.google.gerrit.reviewdb.client.PatchSet;
import org.eclipse.jgit.lib.AnyObjectId;
import org.eclipse.jgit.lib.ObjectId;
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.ArrayList;
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;
public class PatchList implements Serializable {
private static final long serialVersionUID = PatchListKey.serialVersionUID;
private static final Comparator<PatchListEntry> PATCH_CMP =
new Comparator<PatchListEntry>() {
@Override
public int compare(final PatchListEntry a, final PatchListEntry b) {
return a.getNewName().compareTo(b.getNewName());
}
};
@Nullable
private transient ObjectId oldId;
private transient ObjectId newId;
private transient boolean againstParent;
private transient int insertions;
private transient int deletions;
private transient PatchListEntry[] patches;
PatchList(@Nullable final AnyObjectId oldId, final AnyObjectId newId,
final boolean againstParent, final PatchListEntry[] patches) {
this.oldId = oldId != null ? oldId.copy() : null;
this.newId = newId.copy();
this.againstParent = againstParent;
// We assume index 0 contains the magic commit message entry.
if (patches.length > 1) {
Arrays.sort(patches, 1, patches.length, PATCH_CMP);
}
for (int i = 1; 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<PatchListEntry> getPatches() {
return Collections.unmodifiableList(Arrays.asList(patches));
}
/** @return true if {@link #getOldId} is {@link #getNewId}'s ancestor. */
public boolean isAgainstParent() {
return againstParent;
}
/** @return total number of new lines added. */
public int getInsertions() {
return insertions;
}
/** @return total number of lines removed. */
public int getDeletions() {
return deletions;
}
/**
* Get a sorted, modifiable list of all files in this list.
* <p>
* The returned list items do not populate:
* <ul>
* <li>{@link Patch#getCommentCount()}
* <li>{@link Patch#getDraftCount()}
* <li>{@link Patch#isReviewedByCurrentUser()}
* </ul>
*
* @param setId the patch set identity these patches belong to. This really
* should not need to be specified, but is a current legacy artifact of
* how the cache is keyed versus how the database is keyed.
*/
public List<Patch> toPatchList(final PatchSet.Id setId) {
final ArrayList<Patch> r = new ArrayList<>(patches.length);
for (final PatchListEntry e : patches) {
r.add(e.toPatch(setId));
}
return r;
}
/** Find an entry by name, returning an empty entry if not present. */
public PatchListEntry get(final String fileName) {
final int index = search(fileName);
return 0 <= index ? patches[index] : PatchListEntry.empty(fileName);
}
private int search(final String fileName) {
if (Patch.COMMIT_MSG.equals(fileName)) {
return 0;
}
int high = patches.length;
int low = 1;
while (low < high) {
final int mid = (low + high) >>> 1;
final int cmp = patches[mid].getNewName().compareTo(fileName);
if (cmp < 0)
low = mid + 1;
else if (cmp == 0)
return mid;
else
high = mid;
}
return -(low + 1);
}
private void writeObject(final ObjectOutputStream output) throws IOException {
final ByteArrayOutputStream buf = new ByteArrayOutputStream();
final DeflaterOutputStream out = new DeflaterOutputStream(buf);
try {
writeCanBeNull(out, oldId);
writeNotNull(out, newId);
writeVarInt32(out, againstParent ? 1 : 0);
writeVarInt32(out, insertions);
writeVarInt32(out, deletions);
writeVarInt32(out, patches.length);
for (PatchListEntry p : patches) {
p.writeTo(out);
}
} finally {
out.close();
}
writeBytes(output, buf.toByteArray());
}
private void readObject(final ObjectInputStream input) throws IOException {
final ByteArrayInputStream buf = new ByteArrayInputStream(readBytes(input));
final InflaterInputStream in = new InflaterInputStream(buf);
try {
oldId = readCanBeNull(in);
newId = readNotNull(in);
againstParent = readVarInt32(in) != 0;
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;
} finally {
in.close();
}
}
}