Convert the various newline conventions to the local platform's newline convention : Formatter « Email « Java Tutorial

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/*
 * @(#)NewlineOutputStream.java 1.3 01/05/23
 *
 * Copyright 1997-2000 Sun Microsystems, Inc. All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * 
 * - Redistribution in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * 
 * Neither the name of Sun Microsystems, Inc. or the names of contributors
 * may be used to endorse or promote products derived from this software
 * without specific prior written permission.
 * 
 * This software is provided "AS IS," without a warranty of any kind. ALL
 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
 * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
 * PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND
 * ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES OR LIABILITIES
 * SUFFERED BY LICENSEE AS A RESULT OF  OR RELATING TO USE, MODIFICATION
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 * You acknowledge that Software is not designed, licensed or intended
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 */

import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;

/**
 * Convert the various newline conventions to the local platform's newline
 * convention.
 * <P>
 * 
 * This stream can be used with the Message.writeTo method to generate a message
 * that uses the local plaform's line terminator for the purpose of (e.g.)
 * saving the message to a local file.
 */
public class NewlineOutputStream extends FilterOutputStream {
  private int lastb = -1;

  private static byte[] newline;

  public NewlineOutputStream(OutputStream os) {
    super(os);
    if (newline == null) {
      String s = System.getProperty("line.separator");
      if (s == null || s.length() <= 0)
        s = "\n";
      newline = new byte[s.length()];
      s.getBytes(0, s.length(), newline, 0);
    }
  }

  public void write(int b) throws IOException {
    if (b == '\r') {
      out.write(newline);
    } else if (b == '\n') {
      if (lastb != '\r')
        out.write(newline);
    } else {
      out.write(b);
    }
    lastb = b;
  }

  public void write(byte b[]) throws IOException {
    write(b, 0, b.length);
  }

  public void write(byte b[], int off, int len) throws IOException {
    for (int i = 0; i < len; i++) {
      write(b[off + i]);
    }
  }
}