1 files changed, 57 insertions, 0 deletions
diff --git a/gerrit-reviewdb/src/main/java/com/google/gerrit/reviewdb/RevId.java b/gerrit-reviewdb/src/main/java/com/google/gerrit/reviewdb/RevId.java
new file mode 100644
index 0000000000..bea6fb8aad
--- /dev/null
+++ b/gerrit-reviewdb/src/main/java/com/google/gerrit/reviewdb/RevId.java
@@ -0,0 +1,57 @@
+// Copyright (C) 2008 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;
+
+import com.google.gwtorm.client.Column;
+
+/** A revision identifier for a file or a change. */
+public final class RevId {
+  public static final int LEN = 40;
+
+  @Column(length = LEN)
+  protected String id;
+
+  protected RevId() {
+  }
+
+  public RevId(final String str) {
+    id = str;
+  }
+
+  /** @return the value of this revision id. */
+  public String get() {
+    return id;
+  }
+
+  /** @return true if this revision id has all required digits. */
+  public boolean isComplete() {
+    return get().length() == LEN;
+  }
+
+  /**
+   * @return if {@link #isComplete()}, <code>this</code>; otherwise a new RevId
+   *         with 'z' appended on the end.
+   */
+  public RevId max() {
+    if (isComplete()) {
+      return this;
+    }
+
+    final StringBuilder revEnd = new StringBuilder(get().length() + 1);
+    revEnd.append(get());
+    revEnd.append('z');
+    return new RevId(revEnd.toString());
+  }
+}