Java API for mojo system.

mojo/public/java/src/org/chromium/mojo/system/Flags.java

Index: mojo/public/java/src/org/chromium/mojo/system/Flags.java
diff --git a/mojo/public/java/src/org/chromium/mojo/system/Flags.java b/mojo/public/java/src/org/chromium/mojo/system/Flags.java
new file mode 100644
index 0000000000000000000000000000000000000000..87e5725d4edb1ba33bfa4fc5ab484540c84ca963
--- /dev/null
+++ b/mojo/public/java/src/org/chromium/mojo/system/Flags.java
@@ -0,0 +1,48 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.mojo.system;
+
+/**
+ * TODO(qsr): Insert description here.
+ *
+ * @param <F> the type of the flags.
+ */
+public abstract class Flags<F extends Flags<F>> {
+    private int mFlags;
+
+    /**
+     * Dedicated constructor.
+     *
+     * @param flags initial value of the flag.
+     */
+    protected Flags(int flags) {
+        this.mFlags = flags;

[bulach, 2014/04/14 17:39:56]

nit: s/this.//

[qsr, 2014/04/15 08:37:37]

Done.

+    }
+
+    /**
+     * @return the computed flag.
+     */
+    public int getFlags() {
+        return mFlags;
+    }
+
+    /**
+     * Change the given bit of this flag.
+     *
+     * @param value the new value of given bit.
+     * @return this.
+     */
+    protected F setFlag(int flag, boolean value) {
+        if (value) {
+            mFlags |= flag;
+        } else {
+            mFlags &= ~flag;
+        }
+        @SuppressWarnings("unchecked")
+        F f = (F) this;
+        return f;
+    }
+
+}