space-android/src/main/java/com/owncloud/android/ui/asynctasks/CheckAvailableSpaceTask.java

/*
 * Nextcloud Android client application
 *
 * @author Tobias Kaminsky
 * Copyright (C) 2019 Tobias Kaminsky
 * Copyright (C) 2019 Nextcloud GmbH
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <https://www.gnu.org/licenses/>.
 */

package com.owncloud.android.ui.asynctasks;

import android.os.AsyncTask;

import com.owncloud.android.utils.FileStorageUtils;

import java.io.File;

/**
 * Asynchronous task checking if there is space enough to copy all the files chosen to upload into the ownCloud local
 * folder. Maybe an AsyncTask is not strictly necessary, but who really knows.
 */
public class CheckAvailableSpaceTask extends AsyncTask<Boolean, Void, Boolean> {

    private String[] paths;
    private CheckAvailableSpaceListener callback;

    public CheckAvailableSpaceTask(CheckAvailableSpaceListener callback, String[] paths) {
        this.paths = paths;
        this.callback = callback;
    }

    /**
     * Updates the UI before trying the movement.
     */
    @Override
    protected void onPreExecute() {
        callback.onCheckAvailableSpaceStart();
    }

    /**
     * Checks the available space.
     *
     * @param params boolean flag if storage calculation should be done.
     * @return 'True' if there is space enough or doesn't have to be calculated
     */
    @Override
    protected Boolean doInBackground(Boolean... params) {
        long total = 0;
        for (int i = 0; paths != null && i < paths.length; i++) {
            String localPath = paths[i];
            File localFile = new File(localPath);
            total += localFile.length();
        }
        return FileStorageUtils.getUsableSpace() >= total;
    }

    @Override
    protected void onPostExecute(Boolean result) {
        callback.onCheckAvailableSpaceFinish(result, paths);
    }

    public interface CheckAvailableSpaceListener {
        void onCheckAvailableSpaceStart();

        void onCheckAvailableSpaceFinish(boolean hasEnoughSpaceAvailable, String[] filesToUpload);
    }
}