com.google.gerrit.reviewdb.client.CurrentSchemaVersion Maven / Gradle / Ivy
// 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.reviewdb.client;
import com.google.gwtorm.client.Column;
import com.google.gwtorm.client.StringKey;
/** Current version of the database schema, to facilitate live upgrades. */
public final class CurrentSchemaVersion {
public static final class Key extends StringKey> {
private static final long serialVersionUID = 1L;
private static final String VALUE = "X";
@Column(id = 1, length = 1)
public String one = VALUE;
public Key() {}
@Override
public String get() {
return VALUE;
}
@Override
protected void set(String newValue) {
assert get().equals(newValue);
}
}
/** Construct a new, unconfigured instance. */
public static CurrentSchemaVersion create() {
final CurrentSchemaVersion r = new CurrentSchemaVersion();
r.singleton = new CurrentSchemaVersion.Key();
return r;
}
@Column(id = 1)
public Key singleton;
/** Current version number of the schema. */
@Column(id = 2)
public transient int versionNbr;
public CurrentSchemaVersion() {}
}