Trace OutputStream : Debug « Development Class « Java

Trace OutputStream

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 * @(#) 1.6 07/05/04


 * This class is a subclass of DataOutputStream that copies the
 * data being written into the DataOutputStream into another output
 * stream. This class is used here to provide a debug trace of the
 * stuff thats being written out into the DataOutputStream.
 * @author John Mani

public class TraceOutputStream extends FilterOutputStream {
    private boolean trace = false;
    private boolean quote = false;
    private OutputStream traceOut;

     * Creates an output stream filter built on top of the specified
     * underlying output stream.
     * @param   out   the underlying output stream.
     * @param traceOut  the trace stream.
    public TraceOutputStream(OutputStream out, OutputStream traceOut) {
  this.traceOut = traceOut;

     * Set the trace mode.
    public void setTrace(boolean trace) {
  this.trace = trace;

     * Set quote mode.
     * @param quote the quote mode
    public void setQuote(boolean quote) {
  this.quote = quote;

     * Writes the specified <code>byte</code> to this output stream.
     * Writes out the byte into the trace stream if the trace mode
     * is <code>true</code>
    public void write(int b) throws IOException {
  if (trace) {
      if (quote)
     * Writes <code>b.length</code> bytes to this output stream.
     * Writes out the bytes into the trace stream if the trace
     * mode is <code>true</code>
    public void write(byte b[], int off, int len) throws IOException {
  if (trace) {
      if (quote) {
    for (int i = 0; i < len; i++)
        writeByte(b[off + i]);
      } else
    traceOut.write(b, off, len);
  out.write(b, off, len);

     * Write a byte in a way that every byte value is printable ASCII.
    private final void writeByte(int b) throws IOException {
  b &= 0xff;
  if (b > 0x7f) {
      b &= 0x7f;
  if (b == '\r') {
  } else if (b == '\n') {
  } else if (b == '\t') {
  } else if (b < ' ') {
      traceOut.write('@' + b);
  } else {


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