StdOutErrLevel.java

/*
 * StdOutErrLevel
 * 
 * $Id: StdOutErrLevel.java 7868 2010-10-21 23:05:34Z jmfee $
 * $URL: https://ehptools.cr.usgs.gov/svn/ProductDistribution/trunk/src/gov/usgs/earthquake/logging/StdOutErrLevel.java $
 */
package gov.usgs.util.logging;

import java.io.InvalidObjectException;
import java.io.ObjectStreamException;
import java.util.logging.Level;

/**
 * Class defining 2 new Logging levels, one for STDOUT, one for STDERR.
 * 
 * Used when multiplexing STDOUT and STDERR into the same rolling
 * log file via the Java Logging APIs. From
 * http://blogs.sun.com/nickstephen/entry/java_redirecting_system_out_and
 */
public class StdOutErrLevel extends Level {

	private static final long serialVersionUID = 1L;

	/**
	 * Private constructor
	 */
	private StdOutErrLevel(String name, int value) {
		super(name, value);
	}

	/**
	 * Level for STDOUT activity.
	 */
	public static Level STDOUT = new StdOutErrLevel("STDOUT", Level.INFO
			.intValue() + 53);
	/**
	 * Level for STDERR activity
	 */
	public static Level STDERR = new StdOutErrLevel("STDERR", Level.INFO
			.intValue() + 54);

	/**
	 * Method to avoid creating duplicate instances when deserializing the
	 * object.
	 * 
	 * @return the singleton instance of this <code>Level</code> value in this
	 *         classloader
	 * @throws ObjectStreamException
	 *             If unable to deserialize
	 */
	protected Object readResolve() throws ObjectStreamException {
		if (this.intValue() == STDOUT.intValue())
			return STDOUT;
		if (this.intValue() == STDERR.intValue())
			return STDERR;
		throw new InvalidObjectException("Unknown instance :" + this);
	}

}