Mega Code Archive
Provide a debug trace of the stuff thats being written out into the DataOutputStream
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/*
* The contents of this file are subject to the terms
* of the Common Development and Distribution License
* (the "License"). You may not use this file except
* in compliance with the License.
*
* You can obtain a copy of the license at
* glassfish/bootstrap/legal/CDDLv1.0.txt or
* https://glassfish.dev.java.net/public/CDDLv1.0.html.
* See the License for the specific language governing
* permissions and limitations under the License.
*
* When distributing Covered Code, include this CDDL
* HEADER in each file and include the License file at
* glassfish/bootstrap/legal/CDDLv1.0.txt. If applicable,
* add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your
* own identifying information: Portions Copyright [yyyy]
* [name of copyright owner]
*/
/*
* @(#)TraceOutputStream.java 1.5 05/08/29
*
* Copyright 1997-2005 Sun Microsystems, Inc. All Rights Reserved.
*/
// revised from sun mail util
import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;
/**
* 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) {
super(out);
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)
writeByte(b);
else
traceOut.write(b);
}
out.write(b);
}
/**
* 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) {
traceOut.write('M');
traceOut.write('-');
b &= 0x7f;
}
if (b == '\r') {
traceOut.write('\\');
traceOut.write('r');
} else if (b == '\n') {
traceOut.write('\\');
traceOut.write('n');
traceOut.write('\n');
} else if (b == '\t') {
traceOut.write('\\');
traceOut.write('t');
} else if (b < ' ') {
traceOut.write('^');
traceOut.write('@' + b);
} else {
traceOut.write(b);
}
}
}
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