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SciJava Common is a shared library for SciJava software. It provides a plugin framework, with an extensible mechanism for service discovery, backed by its own annotation processor, so that plugins can be loaded dynamically. It is used by downstream projects in the SciJava ecosystem, such as ImageJ and SCIFIO.

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/*
 * #%L
 * SciJava Common shared library for SciJava software.
 * %%
 * Copyright (C) 2009 - 2017 Board of Regents of the University of
 * Wisconsin-Madison, Broad Institute of MIT and Harvard, and Max Planck
 * Institute of Molecular Cell Biology and Genetics.
 * %%
 * 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 java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;

/**
 * Default implementation of {@link Logger}.
 *
 * @author Matthias Arzt
 * @author Curtis Rueden
 */
@IgnoreAsCallingClass
public class DefaultLogger implements Logger, LogListener {

	private final LogListener destination;

	private final LogSource source;

	private final int level;

	private final List listeners = new CopyOnWriteArrayList<>();

	public DefaultLogger(final LogListener destination,
		final LogSource source, final int level)
	{
		this.destination = destination;
		this.source = source;
		this.level = level;
	}

	// -- Logger methods --

	@Override
	public LogSource getSource() {
		return source;
	}

	@Override
	public int getLevel() {
		return level;
	}

	@Override
	public void alwaysLog(final int level, final Object msg, final Throwable t) {
		messageLogged(new LogMessage(source, level, msg, t));
	}

	@Override
	public Logger subLogger(final String name, final int level) {
		LogSource source = getSource().subSource(name);
		int actualLevel = source.hasLogLevel() ? source.logLevel() : level;
		return new DefaultLogger(this, source, actualLevel);
	}

	@Override
	public void addLogListener(final LogListener listener) {
		listeners.add(listener);
	}

	@Override
	public void removeLogListener(final LogListener listener) {
		listeners.remove(listener);
	}

	@Override
	public void notifyListeners(final LogMessage message) {
		for (LogListener listener : listeners)
			listener.messageLogged(message);
	}

	// -- LogListener methods --

	@Override
	public void messageLogged(final LogMessage message) {
		notifyListeners(message);
		destination.messageLogged(message);
	}
}