/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.log4j.xml;

import org.apache.log4j.Level;

/**
 * This class introduces a new level level called TRACE. TRACE has lower level
 * than DEBUG.
 * 
 */
public class XLevel extends Level {
    private static final long serialVersionUID = 7288304330257085144L;

    static public final int TRACE_INT = Level.DEBUG_INT - 1;
    static public final int LETHAL_INT = Level.FATAL_INT + 1;

    private static String TRACE_STR = "TRACE";
    private static String LETHAL_STR = "LETHAL";

    public static final XLevel TRACE = new XLevel(TRACE_INT, TRACE_STR, 7);
    public static final XLevel LETHAL = new XLevel(LETHAL_INT, LETHAL_STR, 0);

    protected XLevel(int level, String strLevel, int syslogEquiv) {
	super(level, strLevel, syslogEquiv);
    }

    /**
     * Convert the string passed as argument to a level. If the conversion fails,
     * then this method returns {@link #TRACE}.
     */
    public static Level toLevel(String sArg) {
	return (Level) toLevel(sArg, XLevel.TRACE);
    }

    public static Level toLevel(String sArg, Level defaultValue) {

	if (sArg == null) {
	    return defaultValue;
	}
	String stringVal = sArg.toUpperCase();

	if (stringVal.equals(TRACE_STR)) {
	    return XLevel.TRACE;
	} else if (stringVal.equals(LETHAL_STR)) {
	    return XLevel.LETHAL;
	}

	return Level.toLevel(sArg, (Level) defaultValue);
    }

    public static Level toLevel(int i) throws IllegalArgumentException {
	switch (i) {
	case TRACE_INT:
	    return XLevel.TRACE;
	case LETHAL_INT:
	    return XLevel.LETHAL;
	}
	return Level.toLevel(i);
    }

}
