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/*
* #%L
* SciJava Common shared library for SciJava software.
* %%
* Copyright (C) 2009 - 2026 SciJava developers.
* %%
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
* #L%
*/
package org.scijava.log;
import static org.scijava.log.LogLevel.DEBUG;
import static org.scijava.log.LogLevel.ERROR;
import static org.scijava.log.LogLevel.INFO;
import static org.scijava.log.LogLevel.TRACE;
import static org.scijava.log.LogLevel.WARN;
/**
* Interface for objects which can produce log messages.
* <p>
* It provides methods for logging messages, exception stack traces and
* combinations of the two.
* </p>
*
* @author Curtis Rueden
* @see LogLevel
* @see LogService
*/
@IgnoreAsCallingClass
public interface Logger {
default void debug(final Object msg) {
log(DEBUG, msg);
}
default void debug(final Throwable t) {
log(DEBUG, t);
}
default void debug(final Object msg, final Throwable t) {
log(DEBUG, msg, t);
}
default void error(final Object msg) {
log(ERROR, msg);
}
default void error(final Throwable t) {
log(ERROR, t);
}
default void error(final Object msg, final Throwable t) {
log(ERROR, msg, t);
}
default void info(final Object msg) {
log(INFO, msg);
}
default void info(final Throwable t) {
log(INFO, t);
}
default void info(final Object msg, final Throwable t) {
log(INFO, msg, t);
}
default void trace(final Object msg) {
log(TRACE, msg);
}
default void trace(final Throwable t) {
log(TRACE, t);
}
default void trace(final Object msg, final Throwable t) {
log(TRACE, msg, t);
}
default void warn(final Object msg) {
log(WARN, msg);
}
default void warn(final Throwable t) {
log(WARN, t);
}
default void warn(final Object msg, final Throwable t) {
log(WARN, msg, t);
}
default boolean isDebug() {
return isLevel(DEBUG);
}
default boolean isError() {
return isLevel(ERROR);
}
default boolean isInfo() {
return isLevel(INFO);
}
default boolean isTrace() {
return isLevel(TRACE);
}
default boolean isWarn() {
return isLevel(WARN);
}
default boolean isLevel(final int level) {
return getLevel() >= level;
}
/**
* Logs a message.
*
* @param level The level at which the message will be logged. If the current
* level (given by {@link #getLevel()} is below this one, no logging
* is performed.
* @param msg The message to log.
*/
default void log(final int level, final Object msg) {
log(level, msg, null);
}
/**
* Logs an exception.
*
* @param level The level at which the exception will be logged. If the
* current level (given by {@link #getLevel()} is below this one, no
* logging is performed.
* @param t The exception to log.
*/
default void log(final int level, final Throwable t) {
log(level, null, t);
}
/**
* Logs a message with an exception.
*
* @param level The level at which the information will be logged. If the
* current level (given by {@link #getLevel()} is below this one, no
* logging is performed.
* @param msg The message to log.
* @param t The exception to log.
*/
default void log(final int level, final Object msg, final Throwable t) {
if (isLevel(level)) alwaysLog(level, msg, t);
}
/**
* Logs a message with an exception. This message will always be logged even
* if its level is above the current level (given by {@link #getLevel()}).
*
* @param level The level at which the information will be logged.
* @param msg The message to log.
* @param t The exception to log.
*/
void alwaysLog(int level, Object msg, Throwable t);
/** Returns the name of this logger. */
default String getName() {
return getSource().name();
}
/** Returns the {@link LogSource} associated with this logger. */
LogSource getSource();
/** Returns the log level of this logger. see {@link LogLevel} */
int getLevel();
/**
* Creates a sub logger, that forwards the message it gets to this logger. The
* sub logger will have the same log level as this logger.
*/
default Logger subLogger(String name) {
return subLogger(name, getLevel());
}
/**
* Creates a sub logger, that forwards the message it gets to this logger.
*
* @param name The name of the sub logger.
* @param level The log level of the sub logger.
*/
Logger subLogger(String name, int level);
/** Adds an item to the list of registered listeners. */
void addLogListener(LogListener listener);
/** Removes an item from the list of registered listeners. */
void removeLogListener(LogListener listener);
/** Broadcasts the given log message to the registered listeners. */
void notifyListeners(final LogMessage message);
}