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// Copyright (C) 2012 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.change;
import com.google.common.base.MoreObjects;
import com.google.common.hash.Hasher;
import com.google.common.hash.Hashing;
import com.google.gerrit.extensions.restapi.RestResource;
import com.google.gerrit.extensions.restapi.RestResource.HasETag;
import com.google.gerrit.extensions.restapi.RestView;
import com.google.gerrit.reviewdb.client.Change;
import com.google.gerrit.server.CurrentUser;
import com.google.gerrit.server.IdentifiedUser;
import com.google.gerrit.server.notedb.ChangeNotes;
import com.google.gerrit.server.project.ChangeControl;
import com.google.gerrit.server.project.ProjectState;
import com.google.gwtorm.server.OrmException;
import com.google.inject.TypeLiteral;
import org.eclipse.jgit.lib.ObjectId;
public class ChangeResource implements RestResource, HasETag {
public static final TypeLiteral<RestView<ChangeResource>> CHANGE_KIND =
new TypeLiteral<RestView<ChangeResource>>() {};
private final ChangeControl control;
public ChangeResource(ChangeControl control) {
this.control = control;
}
protected ChangeResource(ChangeResource copy) {
this.control = copy.control;
}
public ChangeControl getControl() {
return control;
}
public Change getChange() {
return getControl().getChange();
}
public ChangeNotes getNotes() {
return getControl().getNotes();
}
@Override
public String getETag() {
CurrentUser user = control.getCurrentUser();
Hasher h = Hashing.md5().newHasher()
.putLong(getChange().getLastUpdatedOn().getTime())
.putInt(getChange().getRowVersion())
.putBoolean(user.getStarredChanges().contains(getChange().getId()))
.putInt(user.isIdentifiedUser()
? ((IdentifiedUser) user).getAccountId().get()
: 0);
byte[] buf = new byte[20];
ObjectId noteId;
try {
noteId = getNotes().loadRevision();
} catch (OrmException e) {
noteId = null; // This ETag will be invalidated if it loads next time.
}
hashObjectId(h, noteId, buf);
// TODO(dborowitz): Include more notedb and other related refs, e.g. drafts
// and edits.
for (ProjectState p : control.getProjectControl().getProjectState().tree()) {
hashObjectId(h, p.getConfig().getRevision(), buf);
}
return h.hash().toString();
}
private void hashObjectId(Hasher h, ObjectId id, byte[] buf) {
MoreObjects.firstNonNull(id, ObjectId.zeroId()).copyRawTo(buf, 0);
h.putBytes(buf);
}
}
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