| /* |
| * Copyright (C) 2016 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.android.tv.experiments; |
| |
| import android.support.annotation.VisibleForTesting; |
| |
| /** |
| * Experiments return values based on user, device and other criteria. |
| */ |
| public final class ExperimentFlag<T> { |
| |
| private static boolean sAllowOverrides = false; |
| |
| @VisibleForTesting |
| public static void initForTest() { |
| sAllowOverrides = true; |
| } |
| |
| /** Returns a boolean experiment */ |
| public static ExperimentFlag<Boolean> createFlag( |
| boolean defaultValue) { |
| return new ExperimentFlag<>( |
| defaultValue); |
| } |
| |
| private final T mDefaultValue; |
| |
| private T mOverrideValue = null; |
| private boolean mOverridden = false; |
| |
| private ExperimentFlag( |
| T defaultValue) { |
| mDefaultValue = defaultValue; |
| } |
| |
| /** Returns value for this experiment */ |
| public T get() { |
| return sAllowOverrides && mOverridden ? mOverrideValue : mDefaultValue; |
| } |
| |
| @VisibleForTesting |
| public void override(T t) { |
| if (sAllowOverrides) { |
| mOverridden = true; |
| mOverrideValue = t; |
| } |
| } |
| |
| @VisibleForTesting |
| public void resetOverride() { |
| mOverridden = false; |
| } |
| |
| |
| |
| } |