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Set of Java utility classes, all completely independent, to provide lightweight solutions for common situations

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/*
 * Copyright (C) 2014 Zach Melamed
 * 
 * Latest version available online at https://github.com/zach-m/tectonica-commons
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.tectonica.log;

import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.util.logging.ConsoleHandler;
import java.util.logging.Level;
import java.util.logging.LogManager;

/**
 * Configures J.U.L to print to the console using a Tectonica formatter. To use:
 * 
 * add the following to your JVM arguments:
 * 
 *  * -Djava.util.logging.config.class=com.tectonica.log.LogConfigConsole
 * 
 * 
 * 
optionally, if you want to state the minimum log level, add another argument, like this:
 * 
 *  * -Dcom.tectonica.log.level=FINEST
 * 
 * 
 * 
optionally, if you want to provide your own formatter, add another argument, like this:
 * 
 *  * -Dcom.tectonica.log.formatter=com.tectonica.log.LogFormat
 * 
 * 
 * 
 * 
 * @author Zach Melamed
 */
public class LogConfigConsole
{
	private static final String DEFAULT_LEVEL = Level.INFO.getName();
	private static final String DEFAULT_FORMATTER = LogFormat.class.getName();

	public LogConfigConsole() throws Exception
	{
		String level = System.getProperty("com.tectonica.log.level");
		if (level == null || level.isEmpty())
			level = DEFAULT_LEVEL;

		String formatterClassName = System.getProperty("com.tectonica.log.formatter");
		if (formatterClassName == null || formatterClassName.isEmpty())
			formatterClassName = DEFAULT_FORMATTER;

		StringBuilder props = new StringBuilder();

		// configure levels
		props.append(".level = ").append(level).append("\n");
		// TODO: props.append("LOGGERNAME.level = ").append(SPECIFIC_LEVEL).append("\n");

		// configure handlers
		String con = ConsoleHandler.class.getName();
		props.append("handlers = ").append(con).append("\n");

		// configure console handler
		props.append(con).append(".level = ALL").append("\n");
		props.append(con).append(".formatter = ").append(formatterClassName).append("\n");

		// apply configuration
		try (InputStream ins = new ByteArrayInputStream(props.toString().getBytes()))
		{
			LogManager.getLogManager().readConfiguration(ins);
		}
		catch (Exception e)
		{
			e.printStackTrace();
		}
	}
}