/*
 * 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.pattern;

import org.apache.log4j.Level;
import org.apache.log4j.spi.LoggingEvent;

/**
 * Return the event's level in a StringBuffer.
 *
 * @author Ceki G&uuml;lc&uuml;
 */
public final class LevelPatternConverter extends LoggingEventPatternConverter {

    /**
     * Integer severity for Level.TRACE.
     */
    private static final int TRACE_INT = 5000;
    /**
     * Singleton.
     */
    private static final LevelPatternConverter INSTANCE = new LevelPatternConverter();

    /**
     * Private constructor.
     */
    private LevelPatternConverter() {
	super("Level", "level");
    }

    /**
     * Obtains an instance of pattern converter.
     * 
     * @param options options, may be null.
     * @return instance of pattern converter.
     */
    public static LevelPatternConverter newInstance(final String[] options) {
	return INSTANCE;
    }

    /**
     * {@inheritDoc}
     */
    public void format(final LoggingEvent event, final StringBuffer output) {
	output.append(event.getLevel().toString());
    }

    /**
     * {@inheritDoc}
     */
    public String getStyleClass(Object e) {
	if (e instanceof LoggingEvent) {
	    int lint = ((LoggingEvent) e).getLevel().toInt();

	    switch (lint) {
	    case TRACE_INT:
		return "level trace";

	    case Level.DEBUG_INT:
		return "level debug";

	    case Level.INFO_INT:
		return "level info";

	    case Level.WARN_INT:
		return "level warn";

	    case Level.ERROR_INT:
		return "level error";

	    case Level.FATAL_INT:
		return "level fatal";

	    default:
		return "level " + ((LoggingEvent) e).getLevel().toString();
	    }
	}

	return "level";
    }
}
