android-34/com/android/server/companion/Utils.java

/*
 * Copyright (C) 2022 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.companion;

import android.os.Parcel;
import android.os.ResultReceiver;

/**
 * A miscellaneous util class for CDM
 *
 * @hide
 */
public final class Utils {

    /**
     * Convert an instance of a "locally-defined" ResultReceiver to an instance of
     * {@link android.os.ResultReceiver} itself, which the receiving process will be able to
     * unmarshall.
     * @hide
     */
    public static <T extends ResultReceiver> ResultReceiver prepareForIpc(T resultReceiver) {
        final Parcel parcel = Parcel.obtain();
        resultReceiver.writeToParcel(parcel, 0);
        parcel.setDataPosition(0);

        final ResultReceiver ipcFriendly = ResultReceiver.CREATOR.createFromParcel(parcel);
        parcel.recycle();

        return ipcFriendly;
    }

    private Utils() {}
}