BackupControl.java

package net.bible.android.control.backup;

import android.os.Environment;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;

import net.bible.android.SharedConstants;
import net.bible.android.activity.R;
import net.bible.android.control.ApplicationScope;
import net.bible.android.view.activity.base.Callback;
import net.bible.android.view.activity.base.Dialogs;
import net.bible.service.common.FileManager;
import net.bible.service.db.CommonDatabaseHelper;

import java.io.File;

import javax.inject.Inject;

/**
 * Support backup and restore of the And bible database which contains bookmarks and notes.
 *
 * @author Martin Denham [mjdenham at gmail dot com]
 * @see gnu.lgpl.License for license details.<br>
 *      The copyright to this program is held by it's author.
 */
@ApplicationScope
public class BackupControl {
	
	// this is now unused because And Bible databases are held on the SD card to facilitate easier backup by file copy
	private static final File internalDbDir = new File(Environment.getDataDirectory(), "/data/"+SharedConstants.PACKAGE_NAME+"/databases/");

	private static final String TAG = "BackupControl";

	@Inject
	public BackupControl() {
	}

	public void updateOptionsMenu(Menu menu) {
		MenuItem restoreMenuItem = menu.findItem(R.id.restore);
		if (restoreMenuItem!=null) {
			restoreMenuItem.setEnabled(isBackupFile());
		}
	}

	/** backup database to sd card
	 */
	public void backupDatabase() {
		boolean ok = FileManager.copyFile(CommonDatabaseHelper.DATABASE_NAME, internalDbDir, SharedConstants.BACKUP_DIR);

		if (ok) {
			Log.d(TAG, "Copied database to SD card successfully");
			Dialogs.getInstance().showMsg(R.string.backup_success, SharedConstants.BACKUP_DIR.getName());
		} else {
			Log.e(TAG, "Error copying database to SD card");
			Dialogs.getInstance().showErrorMsg(R.string.error_occurred);
		}
	}
	
	/** restore database from sd card
	 */
	public void restoreDatabase() {
		Dialogs.getInstance().showMsg(R.string.restore_confirmation, true, new Callback() {
			@Override
			public void okay() {
				boolean ok = FileManager.copyFile(CommonDatabaseHelper.DATABASE_NAME, SharedConstants.BACKUP_DIR, internalDbDir);
		
				if (ok) {
					Log.d(TAG, "Copied database from SD card successfully");
					Dialogs.getInstance().showMsg(R.string.restore_success, SharedConstants.BACKUP_DIR.getName());
				} else {
					Log.e(TAG, "Error copying database from SD card");
					Dialogs.getInstance().showErrorMsg(R.string.error_occurred);
				}
			}
		});
	}
	
	/** return true if a backup has been done and the file is on the sd card
	 */
	private boolean isBackupFile() {
		return new File(SharedConstants.BACKUP_DIR, CommonDatabaseHelper.DATABASE_NAME).exists();
	}
}