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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;
import static java.util.Comparator.comparingInt;
import com.google.common.collect.Maps;
import com.google.common.collect.Ordering;
import com.google.common.io.BaseEncoding;
import com.google.gerrit.reviewdb.client.Change;
import com.google.gerrit.reviewdb.client.PatchSet;
import com.google.inject.Singleton;
import java.io.IOException;
import java.security.SecureRandom;
import java.util.Map;
import java.util.Random;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.lib.Repository;
@Singleton
public class ChangeUtil {
public static final int TOPIC_MAX_LENGTH = 2048;
private static final Random UUID_RANDOM = new SecureRandom();
private static final BaseEncoding UUID_ENCODING = BaseEncoding.base16().lowerCase();
public static final Ordering<PatchSet> PS_ID_ORDER =
Ordering.from(comparingInt(PatchSet::getPatchSetId));
/** @return a new unique identifier for change message entities. */
public static String messageUuid() {
byte[] buf = new byte[8];
UUID_RANDOM.nextBytes(buf);
return UUID_ENCODING.encode(buf, 0, 4) + '_' + UUID_ENCODING.encode(buf, 4, 4);
}
/**
* Get the next patch set ID from a previously-read map of all refs.
*
* @param allRefs map of full ref name to ref.
* @param id previous patch set ID.
* @return next unused patch set ID for the same change, skipping any IDs whose corresponding ref
* names appear in the {@code allRefs} map.
*/
public static PatchSet.Id nextPatchSetIdFromAllRefsMap(Map<String, Ref> allRefs, PatchSet.Id id) {
PatchSet.Id next = nextPatchSetId(id);
while (allRefs.containsKey(next.toRefName())) {
next = nextPatchSetId(next);
}
return next;
}
/**
* Get the next patch set ID from a previously-read map of refs below the change prefix.
*
* @param changeRefs map of ref suffix to SHA-1, where the keys are ref names with the {@code
* refs/changes/CD/ABCD/} prefix stripped. All refs should be under {@code id}'s change ref
* prefix.
* @param id previous patch set ID.
* @return next unused patch set ID for the same change, skipping any IDs whose corresponding ref
* names appear in the {@code changeRefs} map.
*/
public static PatchSet.Id nextPatchSetIdFromChangeRefsMap(
Map<String, ObjectId> changeRefs, PatchSet.Id id) {
int prefixLen = id.getParentKey().toRefPrefix().length();
PatchSet.Id next = nextPatchSetId(id);
while (changeRefs.containsKey(next.toRefName().substring(prefixLen))) {
next = nextPatchSetId(next);
}
return next;
}
/**
* Get the next patch set ID just looking at a single previous patch set ID.
*
* <p>This patch set ID may or may not be available in the database; callers that want a
* previously-unused ID should use {@link #nextPatchSetIdFromAllRefsMap} or {@link
* #nextPatchSetIdFromChangeRefsMap}.
*
* @param id previous patch set ID.
* @return next patch set ID for the same change, incrementing by 1.
*/
public static PatchSet.Id nextPatchSetId(PatchSet.Id id) {
return new PatchSet.Id(id.getParentKey(), id.get() + 1);
}
/**
* Get the next patch set ID from scanning refs in the repo.
*
* @param git repository to scan for patch set refs.
* @param id previous patch set ID.
* @return next unused patch set ID for the same change, skipping any IDs whose corresponding ref
* names appear in the repository.
*/
public static PatchSet.Id nextPatchSetId(Repository git, PatchSet.Id id) throws IOException {
return nextPatchSetIdFromChangeRefsMap(
Maps.transformValues(
git.getRefDatabase().getRefs(id.getParentKey().toRefPrefix()), Ref::getObjectId),
id);
}
public static String status(Change c) {
return c != null ? c.getStatus().name().toLowerCase() : "deleted";
}
private ChangeUtil() {}
}
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