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
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index 0000000000000000000000000000000000000000..bfce6e471241d22c76871f66f519b372713315ea
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+++ b/mojo/public/java/src/org/chromium/mojo/system/Flags.java
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+// 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;
+
+/**
+ * Base class for bit field used as flags.
+ *
+ * @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) {
+        mFlags = flags;
+    }
+
+    /**
+     * @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;
+    }
+
+}