/*
* Copyright (c) 2002-2012, the original author or authors.
*
* This software is distributable under the BSD license. See the terms of the
* BSD license in the documentation provided with this software.
*
* http://www.opensource.org/licenses/bsd-license.php
*/
package jline.internal;
import java.io.PrintStream;
import static jline.internal.Preconditions.checkNotNull;
/**
* Internal logger.
*
* @author <a href="mailto:jason@planet57.com">Jason Dillon</a>
* @since 2.0
*/
public final class Log
{
///CLOVER:OFF
public static enum Level
{
TRACE,
DEBUG,
INFO,
WARN,
ERROR
}
@SuppressWarnings({"StringConcatenation"})
public static final boolean TRACE = Boolean.getBoolean(Log.class.getName() + ".trace");
@SuppressWarnings({"StringConcatenation"})
public static final boolean DEBUG = TRACE || Boolean.getBoolean(Log.class.getName() + ".debug");
private static PrintStream output = System.err;
public static PrintStream getOutput() {
return output;
}
public static void setOutput(final PrintStream out) {
output = checkNotNull(out);
}
/**
* Helper to support rendering messages.
*/
@TestAccessible
static void render(final PrintStream out, final Object message) {
if (message.getClass().isArray()) {
Object[] array = (Object[]) message;
out.print("[");
for (int i = 0; i < array.length; i++) {
out.print(array[i]);
if (i + 1 < array.length) {
out.print(",");
}
}
out.print("]");
}
else {
out.print(message);
}
}
@TestAccessible
static void log(final Level level, final Object... messages) {
//noinspection SynchronizeOnNonFinalField
synchronized (output) {
output.format("[%s] ", level);
for (int i=0; i<messages.length; i++) {
// Special handling for the last message if its a throwable, render its stack on the next line
if (i + 1 == messages.length && messages[i] instanceof Throwable) {
output.println();
((Throwable)messages[i]).printStackTrace(output);
}
else {
render(output, messages[i]);
}
}
output.println();
output.flush();
}
}
public static void trace(final Object... messages) {
if (TRACE) {
log(Level.TRACE, messages);
}
}
public static void debug(final Object... messages) {
if (TRACE || DEBUG) {
log(Level.DEBUG, messages);
}
}
/**
* @since 2.7
*/
public static void info(final Object... messages) {
log(Level.INFO, messages);
}
public static void warn(final Object... messages) {
log(Level.WARN, messages);
}
public static void error(final Object... messages) {
log(Level.ERROR, messages);
}
}