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/*
* Copyright (C) 2017 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 android.util;
import android.content.Context;
import android.os.SystemProperties;
import android.provider.Settings;
import android.text.TextUtils;
import java.util.Map;
/**
* Util class to get feature flag information.
*
* @hide
*/
public class FeatureFlagUtils {
public static final String FFLAG_PREFIX = "sys.fflag.";
public static final String FFLAG_OVERRIDE_PREFIX = FFLAG_PREFIX + "override.";
/**
* Whether or not a flag is enabled.
*
* @param feature the flag name
* @return true if the flag is enabled (either by default in system, or override by user)
*/
public static boolean isEnabled(Context context, String feature) {
// Override precedence:
// Settings.Global -> sys.fflag.override.* -> sys.fflag.*
// Step 1: check if feature flag is set in Settings.Global.
String value;
if (context != null) {
value = Settings.Global.getString(context.getContentResolver(), feature);
if (!TextUtils.isEmpty(value)) {
return Boolean.parseBoolean(value);
}
}
// Step 2: check if feature flag has any override. Flag name: sys.fflag.override.<feature>
value = SystemProperties.get(FFLAG_OVERRIDE_PREFIX + feature);
if (!TextUtils.isEmpty(value)) {
return Boolean.parseBoolean(value);
}
// Step 3: check if feature flag has any default value. Flag name: sys.fflag.<feature>
value = SystemProperties.get(FFLAG_PREFIX + feature);
return Boolean.parseBoolean(value);
}
/**
* Override feature flag to new state.
*/
public static void setEnabled(Context context, String feature, boolean enabled) {
SystemProperties.set(FFLAG_OVERRIDE_PREFIX + feature, enabled ? "true" : "false");
}
/**
* Returns all feature flags in their raw form.
*/
public static Map<String, String> getAllFeatureFlags() {
return null;
}
}
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