com/android/server/backup/SliceBackupHelper.java

/*
 * Copyright (C) 2018 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.backup;

import android.app.backup.BlobBackupHelper;
import android.app.slice.ISliceManager;
import android.content.Context;
import android.os.ServiceManager;
import android.os.UserHandle;
import android.util.Log;
import android.util.Slog;

public class SliceBackupHelper extends BlobBackupHelper {
    static final String TAG = "SliceBackupHelper";
    static final boolean DEBUG = Log.isLoggable(TAG, Log.DEBUG);

    // Current version of the blob schema
    static final int BLOB_VERSION = 1;

    // Key under which the payload blob is stored
    static final String KEY_SLICES = "slices";

    public SliceBackupHelper(Context context) {
        super(BLOB_VERSION, KEY_SLICES);
        // context is currently unused
    }

    @Override
    protected byte[] getBackupPayload(String key) {
        byte[] newPayload = null;
        if (KEY_SLICES.equals(key)) {
            try {
                ISliceManager sm = ISliceManager.Stub.asInterface(
                        ServiceManager.getService(Context.SLICE_SERVICE));
                // TODO: http://b/22388012
                newPayload = sm.getBackupPayload(UserHandle.USER_SYSTEM);
            } catch (Exception e) {
                // Treat as no data
                Slog.e(TAG, "Couldn't communicate with slice manager");
                newPayload = null;
            }
        }
        return newPayload;
    }

    @Override
    protected void applyRestoredPayload(String key, byte[] payload) {
        if (DEBUG) Slog.v(TAG, "Got restore of " + key);

        if (KEY_SLICES.equals(key)) {
            try {
                ISliceManager sm = ISliceManager.Stub.asInterface(
                        ServiceManager.getService(Context.SLICE_SERVICE));
                // TODO: http://b/22388012
                sm.applyRestore(payload, UserHandle.USER_SYSTEM);
            } catch (Exception e) {
                Slog.e(TAG, "Couldn't communicate with slice manager");
            }
        }
    }

}