Android Open Source - rfcx-guardian-android F L A C File Output Stream

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License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright (C) 2010  Preston Lacey http://javaflacencoder.sourceforge.net/
 * All Rights Reserved./*  ww  w. j a v a2s .c o m*/
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */

package net.sourceforge.javaFlacEncoder;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.File;
import java.nio.channels.FileChannel;
import java.io.Closeable;

/**
 * This class provides basic file output for writing from a FLACEncoder.
 * 
 * @author Preston Lacey
 */
public class FLACFileOutputStream implements FLACOutputStream,Closeable{

  FileOutputStream fos = null;
  long position;
  long size = 0;
  boolean valid;

  /**
   * Constructor. Create a FLACFileOutputStream using the given filename. If
   * file exists, file will be overwritten.
   *
   * @param filename file to connect to output stream.
   */
  public FLACFileOutputStream(String filename) throws IOException {
    position = 0;
    fos = new FileOutputStream(filename);
    valid = true;
  }

  public FLACFileOutputStream(File file) throws IOException {
    position = 0;
    fos = new FileOutputStream(file);
    valid = true;
  }

  /**
   * Constructor. Create a FLACFileOutputStream using the given FileOutputStream.
   * @param fos FileOutputStream to write to, must be open. Current position
   * of fos will be used as this object's position.
   * @throws IOException
   */
  public FLACFileOutputStream(FileOutputStream fos) throws IOException {
    FileChannel fc = fos.getChannel();
    position = fc.position();
    this.fos = fos;
    valid = true;
  }
    
  /**
   * Get the status of this file stream(whether the file was successfully open
   * or not).
   * @return true if file was successfully opened, false otherwise.
   */
  @Deprecated
  public boolean isValid() { return valid; }

  /**
   * Attempt to seek to the given location within this stream. It is not
   * guaranteed that all implementations can or will support seeking. Use the
   * method canSeek()
   *
   * @param pos target position to seek to.
   * @return current position after seek attempt.
   */
  public long seek(long pos) throws IOException {
    FileChannel fc = fos.getChannel();
    fc.position(pos);
    return pos;
  }

  /**
   * Write a byte to this stream.
   * @param data byte to write.
   * @throws IOException IOException will be raised if an error occurred while
   * writing.
   */
  public void write(byte data) throws IOException {
    fos.write(data);
    if(position + 1 > size)
      size = position+1;
    position+= 1;
  }
  /**
   * Write the given number of bytes from the byte array. Return number of
   * bytes written.
   * @param data array containing bytes to be written.
   * @param offset start index of array to begin reading from.
   * @param count number of bytes to write.
   * @return number of bytes written.
   * @throws IOException IOException upon a write error.
   */
  public int write(byte[] data, int offset, int count) throws IOException {
    int result = count;
    try {
      fos.write(data,offset,count);
      if(position + count > size)
        size = position+count;
      position+= count;
    }catch(IOException e) {
      throw e;
    }
    return result;
  }

  /**
   * Get the number of bytes that have been written in length!
   * This takes into account seeking to different portions.
   * @return total length written.
   */
  public long size() {
    return size;
  }

  /**
   * Test whether this stream is seekable.
   * @return true if stream is seekable, false otherwise
   */
  public boolean canSeek() {
    return true;
  }

  /**
   * Get the current write position of this stream.
   * @return current write position.
   */
  public long getPos() {
    return position;
  }

  /**
   * Close FileOutputStream owned by this object.
   * @throws IOException
   */
  public void close() throws IOException {
    fos.close();
  }
}

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