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/*
* 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.common.experiments;
import android.support.annotation.VisibleForTesting;
import com.android.tv.common.BuildConfig;
import com.google.common.base.Supplier;
/** Experiments return values based on user, device and other criteria. */
public final class ExperimentFlag<T> {
// NOTE: sAllowOverrides IS NEVER USED in the non AOSP version.
private static boolean sAllowOverrides = false;
@VisibleForTesting
public static void initForTest() {
/* Begin_AOSP_Comment_Out
if (!BuildConfig.AOSP) {
PhenotypeFlag.initForTest();
return;
}
End_AOSP_Comment_Out */
sAllowOverrides = true;
}
/** Returns a boolean experiment */
public static ExperimentFlag<Boolean> createFlag(
// AOSP_Comment_Out Supplier<Boolean> phenotypeFlag,
boolean defaultValue) {
return new ExperimentFlag<>(
// AOSP_Comment_Out phenotypeFlag,
defaultValue);
}
private final T mDefaultValue;
// AOSP_Comment_Out private final Supplier<T> mPhenotypeFlag;
// AOSP_Comment_Out // NOTE: mOverrideValue IS NEVER USED in the non AOSP version.
private T mOverrideValue = null;
// mOverridden IS NEVER USED in the non AOSP version.
private boolean mOverridden = false;
private ExperimentFlag(
// AOSP_Comment_Out Supplier<T> phenotypeFlag,
// NOTE: defaultValue IS NEVER USED in the non AOSP version.
T defaultValue) {
mDefaultValue = defaultValue;
// AOSP_Comment_Out mPhenotypeFlag = phenotypeFlag;
}
/** Returns value for this experiment */
public T get() {
/* Begin_AOSP_Comment_Out
if (!BuildConfig.AOSP) {
return mPhenotypeFlag.get();
}
End_AOSP_Comment_Out */
return sAllowOverrides && mOverridden ? mOverrideValue : mDefaultValue;
}
@VisibleForTesting
public void override(T t) {
if (sAllowOverrides) {
mOverridden = true;
mOverrideValue = t;
}
}
@VisibleForTesting
public void resetOverride() {
mOverridden = false;
}
/* Begin_AOSP_Comment_Out
@VisibleForTesting
T getAospDefaultValueForTesting() {
return mDefaultValue;
}
End_AOSP_Comment_Out */
}
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