libraries/flag-helpers/junit/test/src/android/platform/test/flag/junit/FakeFeatureFlagsImpl.java

/*
 * Copyright (C) 2023 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.platform.test.flag.junit;

import java.util.HashMap;
import java.util.Map;
import java.util.function.Predicate;

/** @hide */
public class FakeFeatureFlagsImpl extends CustomFeatureFlags {
    private final Map<String, Boolean> mFlagMap = new HashMap<>();
    private final FeatureFlags mDefaults;

    public FakeFeatureFlagsImpl() {
        this(null);
    }

    public FakeFeatureFlagsImpl(FeatureFlags defaults) {
        super(null);
        mDefaults = defaults;
        // Initialize the map with null values
        for (String flagName : getFlagNames()) {
            mFlagMap.put(flagName, null);
        }
    }

    @Override
    protected boolean getValue(String flagName, Predicate<FeatureFlags> getter) {
        Boolean value = this.mFlagMap.get(flagName);
        if (value != null) {
            return value;
        }
        if (mDefaults != null) {
            return getter.test(mDefaults);
        }
        throw new IllegalArgumentException(flagName + " is not set");
    }

    public void setFlag(String flagName, boolean value) {
        if (!this.mFlagMap.containsKey(flagName)) {
            throw new IllegalArgumentException("no such flag " + flagName);
        }
        this.mFlagMap.put(flagName, value);
    }

    public void resetAll() {
        for (Map.Entry entry : mFlagMap.entrySet()) {
            entry.setValue(null);
        }
    }
}