com.sun.mail.util.LogOutputStream Maven / Gradle / Ivy
/*
* Copyright (c) 2008, 2018 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 com.sun.mail.util;
import java.io.IOException;
import java.io.OutputStream;
import java.util.logging.Level;
/**
* Capture output lines and send them to the mail logger.
*/
public class LogOutputStream extends OutputStream {
protected MailLogger logger;
protected Level level;
private int lastb = -1;
private byte[] buf = new byte[80];
private int pos = 0;
/**
* Log to the specified logger.
*
* @param logger the MailLogger
*/
public LogOutputStream(MailLogger logger) {
this.logger = logger;
this.level = Level.FINEST;
}
@Override
public void write(int b) throws IOException {
if (!logger.isLoggable(level))
return;
if (b == '\r') {
logBuf();
} else if (b == '\n') {
if (lastb != '\r')
logBuf();
} else {
expandCapacity(1);
buf[pos++] = (byte)b;
}
lastb = b;
}
@Override
public void write(byte b[]) throws IOException {
write(b, 0, b.length);
}
@Override
public void write(byte b[], int off, int len) throws IOException {
int start = off;
if (!logger.isLoggable(level))
return;
len += off;
for (int i = start; i < len ; i++) {
if (b[i] == '\r') {
expandCapacity(i - start);
System.arraycopy(b, start, buf, pos, i - start);
pos += i - start;
logBuf();
start = i + 1;
} else if (b[i] == '\n') {
if (lastb != '\r') {
expandCapacity(i - start);
System.arraycopy(b, start, buf, pos, i - start);
pos += i - start;
logBuf();
}
start = i + 1;
}
lastb = b[i];
}
if ((len - start) > 0) {
expandCapacity(len - start);
System.arraycopy(b, start, buf, pos, len - start);
pos += len - start;
}
}
/**
* Log the specified message.
* Can be overridden by subclass to do different logging.
*
* @param msg the message to log
*/
protected void log(String msg) {
logger.log(level, msg);
}
/**
* Convert the buffer to a string and log it.
*/
private void logBuf() {
String msg = new String(buf, 0, pos);
pos = 0;
log(msg);
}
/**
* Ensure that the buffer can hold at least len bytes
* beyond the current position.
*/
private void expandCapacity(int len) {
while (pos + len > buf.length) {
byte[] nb = new byte[buf.length * 2];
System.arraycopy(buf, 0, nb, 0, pos);
buf = nb;
}
}
}