NewlineOutputStream.java

package com.opentravelsoft.util;

import java.io.*;

/**
 * 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 = s.getBytes();
        }
    }

    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]);
        }
    }
}