br.com.anteros.android.persistence.backup.ExportDatabaseTask.java Source code

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Here is the source code for br.com.anteros.android.persistence.backup.ExportDatabaseTask.java

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/*
 * Copyright 2016 Anteros Tecnologia
 *
 * 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 br.com.anteros.android.persistence.backup;

import android.Manifest;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.SharedPreferences;
import android.content.pm.PackageManager;
import android.database.sqlite.SQLiteDatabase;
import android.os.AsyncTask;
import android.os.Environment;
import android.support.v4.app.ActivityCompat;
import android.widget.Toast;

import java.io.File;
import java.text.SimpleDateFormat;
import java.util.Date;

import br.com.anteros.android.core.util.AndroidFileUtils;
import br.com.anteros.android.core.util.FileUtil;

public class ExportDatabaseTask extends AsyncTask<Void, Void, String> {
    private final static int maxBackupFiles = 12;
    private static File lastBackup;
    private ProgressDialog dialog;
    private Context context;
    private boolean runByService;
    private String databasePath;
    private String databaseName;
    private SharedPreferences preferences;

    public ExportDatabaseTask(Context context, String absolutPathDb, String databaseName, boolean runByService,
            SharedPreferences preferences) {
        this.context = context;
        this.databasePath = absolutPathDb;
        this.databaseName = databaseName;
        this.runByService = runByService;
        if (runByService == false) {
            this.dialog = new ProgressDialog(context);
        }
        this.preferences = preferences;
    }

    public ExportDatabaseTask(Context context, String absolutPathDb, String databaseName,
            SharedPreferences preferences) {
        this(context, absolutPathDb, databaseName, false, preferences);
    }

    public static String executarBackup(String databaseName, String databasePath, SharedPreferences preferences,
            Context context) {

        if (ActivityCompat.checkSelfPermission(context,
                Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED
                || ActivityCompat.checkSelfPermission(context,
                        Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
            throw new BackupException(
                    "No foi possvel executar a tarefa de backup pois voc no possu permisso para isto. Verifique se solicitou permisso no manifesto ou requisitou a permisso caso esteja usando Android(Marshmallow) 6 ou acima.");
        }

        File dbFile = new File(databasePath);

        File exportDir = new File(Environment.getExternalStorageDirectory(), "backup");

        if (!exportDir.exists()) {
            exportDir.mkdirs();
        }

        if (countBackupFiles(exportDir, dbFile.getName()) >= maxBackupFiles) {
            deleteOldBackup(exportDir, dbFile.getName());
        }

        lastBackup = new File(exportDir, generateBackupName(dbFile));
        try {
            lastBackup.createNewFile();
            AndroidFileUtils.copyFile(dbFile, lastBackup);
            SharedPreferences.Editor editor = preferences.edit();
            editor.putLong(BackupService.DATE_TIME_LAST_BACKUP, new Date().getTime());
            editor.commit();
        } catch (Exception e) {
            e.printStackTrace();
            return e.getMessage();
        }

        SQLiteDatabase db = null;
        try {
            db = context.openOrCreateDatabase(databaseName, SQLiteDatabase.OPEN_READWRITE, null);
            db.execSQL("vacuum;");
            db.execSQL("reindex;");
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                db.close();
            } catch (Exception e2) {
            }
        }

        return "OK";
    }

    /**
     * Deleta arquivo de backup mais antigo de dentro da pasta "backup" no
     * carto de memria.
     *
     * @param exportDir
     */
    private static void deleteOldBackup(File exportDir, String bdFileName) {
        File oldFile = null;
        for (File f : exportDir.listFiles(new BackupFileFilter(bdFileName))) {
            if (oldFile == null || oldFile.lastModified() > f.lastModified()) {
                oldFile = f;
            }
        }
        if (oldFile != null && oldFile.exists()) {
            oldFile.delete();
        }
    }

    /**
     * Retorna quantidade de arquivos de backup de dentro da pasta "backup" no
     * carto de memria
     *
     * @param exportDir
     * @return
     */
    private static int countBackupFiles(File exportDir, String bdFileName) {
        if (exportDir != null && exportDir.exists()) {
            File[] arqs = exportDir.listFiles(new BackupFileFilter(bdFileName));
            return arqs != null ? arqs.length : 0;
        }
        return 0;
    }

    private static String generateBackupName(File dbFile) {
        String name = "";

        name = new SimpleDateFormat("yyyy-MM-dd_HH-mm-ss-").format(new Date()) + dbFile.getName();

        return name;
    }

    @Override
    protected void onPreExecute() {
        if (runByService == false) {
            dialog.setMessage("Exportando banco de dados...");
            dialog.show();
        }
    }

    @Override
    protected String doInBackground(final Void... args) {
        return executarBackup(databaseName, databasePath, preferences, context);
    }

    @Override
    protected void onPostExecute(final String success) {
        if (runByService == false) {
            if (dialog.isShowing()) {
                dialog.dismiss();
            }
            if (success.equals("OK")) {
                Toast.makeText(this.context, "Exportao realizada com sucesso!", Toast.LENGTH_SHORT).show();
            } else {
                Toast.makeText(this.context, "Export falhou - " + success, Toast.LENGTH_LONG).show();
            }
        }
    }

}