org.eclipse.angus.mail.util.TraceOutputStream Maven / Gradle / Ivy
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/*
* Copyright (c) 1997, 2023 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package org.eclipse.angus.mail.util;
import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.logging.Level;
/**
* 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 logger log trace here
*/
public TraceOutputStream(OutputStream out, MailLogger logger) {
super(out);
this.trace = logger.isLoggable(Level.FINEST);
this.traceOut = new LogOutputStream(logger);
;
}
/**
* 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.
*
* @param trace 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 byte to this output stream.
* Writes out the byte into the trace stream if the trace mode
* is true
*
* @param b the byte to write
* @exception IOException for I/O errors
*/
@Override
public void write(int b) throws IOException {
if (trace) {
if (quote)
writeByte(b);
else
traceOut.write(b);
}
out.write(b);
}
/**
* Writes b.length bytes to this output stream.
* Writes out the bytes into the trace stream if the trace
* mode is true
*
* @param b bytes to write
* @param off offset in array
* @param len number of bytes to write
* @exception IOException for I/O errors
*/
@Override
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);
}
}
}