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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.common.base.Preconditions.checkState;
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.common.collect.ImmutableBiMap;
import com.google.gerrit.common.Nullable;
import com.google.gerrit.extensions.client.DiffPreferencesInfo.Whitespace;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.Objects;
import org.eclipse.jgit.lib.AnyObjectId;
import org.eclipse.jgit.lib.ObjectId;
public class PatchListKey implements Serializable {
public static final long serialVersionUID = 24L;
public static final ImmutableBiMap<Whitespace, Character> WHITESPACE_TYPES =
ImmutableBiMap.of(
Whitespace.IGNORE_NONE, 'N',
Whitespace.IGNORE_TRAILING, 'E',
Whitespace.IGNORE_LEADING_AND_TRAILING, 'S',
Whitespace.IGNORE_ALL, 'A');
static {
checkState(WHITESPACE_TYPES.size() == Whitespace.values().length);
}
public static PatchListKey againstDefaultBase(AnyObjectId newId, Whitespace ws) {
return new PatchListKey(null, newId, ws);
}
public static PatchListKey againstParentNum(int parentNum, AnyObjectId newId, Whitespace ws) {
return new PatchListKey(parentNum, newId, ws);
}
/**
* Old patch-set ID
*
* <p>When null, it represents the Base of the newId for a non-merge commit.
*
* <p>When newId is a merge commit, null value of the oldId represents either the auto-merge
* commit of the newId or a parent commit of the newId. These two cases are distinguished by the
* parentNum.
*/
private transient ObjectId oldId;
/**
* 1-based parent number when newId is a merge commit
*
* <p>For the auto-merge case this field is null.
*
* <p>Used only when oldId is null and newId is a merge commit
*/
private transient Integer parentNum;
private transient ObjectId newId;
private transient Whitespace whitespace;
public PatchListKey(AnyObjectId a, AnyObjectId b, Whitespace ws) {
oldId = a != null ? a.copy() : null;
newId = b.copy();
whitespace = ws;
}
private PatchListKey(int parentNum, AnyObjectId b, Whitespace ws) {
this.parentNum = Integer.valueOf(parentNum);
newId = b.copy();
whitespace = ws;
}
/** For use only by DiffSummaryKey. */
PatchListKey(ObjectId oldId, Integer parentNum, ObjectId newId, Whitespace whitespace) {
this.oldId = oldId;
this.parentNum = parentNum;
this.newId = newId;
this.whitespace = whitespace;
}
/** Old side commit, or null to assume ancestor or combined merge. */
@Nullable
public ObjectId getOldId() {
return oldId;
}
/** Parent number (old side) of the new side (merge) commit */
@Nullable
public Integer getParentNum() {
return parentNum;
}
/** New side commit name. */
public ObjectId getNewId() {
return newId;
}
public Whitespace getWhitespace() {
return whitespace;
}
@Override
public int hashCode() {
return Objects.hash(oldId, parentNum, newId, whitespace);
}
@Override
public boolean equals(final Object o) {
if (o instanceof PatchListKey) {
PatchListKey k = (PatchListKey) o;
return Objects.equals(oldId, k.oldId)
&& Objects.equals(parentNum, k.parentNum)
&& Objects.equals(newId, k.newId)
&& whitespace == k.whitespace;
}
return false;
}
@Override
public String toString() {
StringBuilder n = new StringBuilder();
n.append("PatchListKey[");
n.append(oldId != null ? oldId.name() : "BASE");
n.append("..");
n.append(newId.name());
n.append(" ");
if (parentNum != null) {
n.append(parentNum);
n.append(" ");
}
n.append(whitespace.name());
n.append("]");
return n.toString();
}
private void writeObject(final ObjectOutputStream out) throws IOException {
writeCanBeNull(out, oldId);
out.writeInt(parentNum == null ? 0 : parentNum);
writeNotNull(out, newId);
Character c = WHITESPACE_TYPES.get(whitespace);
if (c == null) {
throw new IOException("Invalid whitespace type: " + whitespace);
}
out.writeChar(c);
}
private void readObject(final ObjectInputStream in) throws IOException {
oldId = readCanBeNull(in);
int n = in.readInt();
parentNum = n == 0 ? null : Integer.valueOf(n);
newId = readNotNull(in);
char t = in.readChar();
whitespace = WHITESPACE_TYPES.inverse().get(t);
if (whitespace == null) {
throw new IOException("Invalid whitespace type code: " + t);
}
}
}
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