com/android/server/broadcastradio/hal2/Utils.java

/**
 * 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 com.android.server.broadcastradio.hal2;

import android.annotation.NonNull;
import android.os.RemoteException;

enum FrequencyBand {
    UNKNOWN,
    FM,
    AM_LW,
    AM_MW,
    AM_SW,
};

class Utils {
    private static final String TAG = "BcRadio2Srv.utils";

    static FrequencyBand getBand(int freq) {
        // keep in sync with hardware/interfaces/broadcastradio/common/utils2x/Utils.cpp
        if (freq < 30) return FrequencyBand.UNKNOWN;
        if (freq < 500) return FrequencyBand.AM_LW;
        if (freq < 1705) return FrequencyBand.AM_MW;
        if (freq < 30000) return FrequencyBand.AM_SW;
        if (freq < 60000) return FrequencyBand.UNKNOWN;
        if (freq < 110000) return FrequencyBand.FM;
        return FrequencyBand.UNKNOWN;
    }

    interface FuncThrowingRemoteException<T> {
        T exec() throws RemoteException;
    }

    static <T> T maybeRethrow(@NonNull FuncThrowingRemoteException<T> r) {
        try {
            return r.exec();
        } catch (RemoteException ex) {
            ex.rethrowFromSystemServer();
            return null;  // unreachable
        }
    }

    interface VoidFuncThrowingRemoteException {
        void exec() throws RemoteException;
    }

    static void maybeRethrow(@NonNull VoidFuncThrowingRemoteException r) {
        try {
            r.exec();
        } catch (RemoteException ex) {
            ex.rethrowFromSystemServer();
        }
    }
}