FileSystemDataWritter.java

/*
  * This file is part of WhereYouGo.
  *
  * WhereYouGo 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.
  *
  * WhereYouGo 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 WhereYouGo.  If not, see <http://www.gnu.org/licenses/>.
  *
  * Copyright (C) 2012 Menion <whereyougo@asamm.cz>
  */ 

package menion.android.whereyougo.utils;

import java.io.File;
import java.io.FileOutputStream;

public class FileSystemDataWritter extends Thread {

	private static final String TAG = "FileSystemDataWritter";

	private String fileToWrite;
	private byte[] dataToWrite;
	private long bytePos;

	/**
	 * Save bytes to file.
	 * 
	 * @param fileToWrite
	 * @param dataToWrite
	 * @param bytePos
	 *            position at write data or <br>
	 *            -1 if write as whole new file<br>
	 *            -2 if write at the end of file
	 */
	public FileSystemDataWritter(String fileToWrite, byte[] dataToWrite,
			long bytePos) {
		this.fileToWrite = fileToWrite;
		this.dataToWrite = dataToWrite;
		this.bytePos = bytePos;
		this.start();
	}

	public void run() {
		try {
			FileSystem.checkFolders(fileToWrite);

			// create if not exist
			// Log.w(TAG, "write to file: " + fileToWrite);
			File file = new File(fileToWrite);
			if (!file.exists()) {
				file.createNewFile();
			}

			if (dataToWrite != null) {
				FileOutputStream os;
				if (bytePos == -1) {
					os = new FileOutputStream(file, false);
				} else if (bytePos == -2) {
					os = new FileOutputStream(file, true);
				} else {
					os = new FileOutputStream(file, true);
					os.getChannel().position(bytePos);
				}

				os.write(dataToWrite);
				os.close();
			}

		} catch (Exception e) {
			Logger.e(TAG, "run(" + fileToWrite + ")", e);
		}
	}
}