org.scijava.log.StderrLogService Maven / Gradle / Ivy

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/*
 * #%L
 * SciJava Common shared library for SciJava software.
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 * Copyright (C) 2009 - 2017 Board of Regents of the University of
 * Wisconsin-Madison, Broad Institute of MIT and Harvard, Max Planck
 * Institute of Molecular Cell Biology and Genetics, University of
 * Konstanz, and KNIME GmbH.
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package org.scijava.log;

import java.io.PrintStream;
import java.util.function.Function;

import org.scijava.Priority;
import org.scijava.plugin.Plugin;
import org.scijava.service.Service;

/**
 * Implementation of {@link LogService} using the standard error stream.
 * 
 * Actually, this service is somewhat misnamed now, since it prints {@code WARN}
 * and {@code ERROR} messages to stderr, but messages at lesser severities to
 * stdout.
 * 
 * 
 * @author Johannes Schindelin
 * @author Curtis Rueden
 */
@Plugin(type = Service.class, priority = Priority.LOW)
public class StderrLogService extends AbstractLogService {

	private Function levelToStream =
		level -> (level <= LogLevel.WARN) ? System.err : System.out;

	public void setPrintStreams(Function levelToStream) {
		this.levelToStream = levelToStream;
	}

	@Override
	protected void messageLogged(LogMessage message) {
		final PrintStream out = levelToStream.apply(message.level());
		out.print(message);
	}
}