1 files changed, 61 insertions, 0 deletions
diff --git a/gerrit-reviewdb/src/main/java/com/google/gerrit/reviewdb/client/CurrentSchemaVersion.java b/gerrit-reviewdb/src/main/java/com/google/gerrit/reviewdb/client/CurrentSchemaVersion.java
new file mode 100644
index 0000000000..183bb1ef42
--- /dev/null
+++ b/gerrit-reviewdb/src/main/java/com/google/gerrit/reviewdb/client/CurrentSchemaVersion.java
@@ -0,0 +1,61 @@
+// 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<com.google.gwtorm.client.Key<?>> {
+    private static final long serialVersionUID = 1L;
+
+    private static final String VALUE = "X";
+
+    @Column(id = 1, length = 1)
+    protected String one = VALUE;
+
+    public Key() {
+    }
+
+    @Override
+    public String get() {
+      return VALUE;
+    }
+
+    @Override
+    protected void set(final 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)
+  protected Key singleton;
+
+  /** Current version number of the schema. */
+  @Column(id = 2)
+  public transient int versionNbr;
+
+  protected CurrentSchemaVersion() {
+  }
+}