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/*
 * 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.spi.LoggingEvent;

/**
 * Formats a logger name.
 *
 * @author Ceki Gülcü
 *
 */
public final class LoggerPatternConverter extends NamePatternConverter {
    /**
     * Singleton.
     */
    private static final LoggerPatternConverter INSTANCE = new LoggerPatternConverter(null);

    /**
     * Private constructor.
     * 
     * @param options options, may be null.
     */
    private LoggerPatternConverter(final String[] options) {
	super("Logger", "logger", options);
    }

    /**
     * Obtains an instance of pattern converter.
     * 
     * @param options options, may be null.
     * @return instance of pattern converter.
     */
    public static LoggerPatternConverter newInstance(final String[] options) {
	if ((options == null) || (options.length == 0)) {
	    return INSTANCE;
	}

	return new LoggerPatternConverter(options);
    }

    /**
     * {@inheritDoc}
     */
    public void format(final LoggingEvent event, final StringBuffer toAppendTo) {
	final int initialLength = toAppendTo.length();
	toAppendTo.append(event.getLoggerName());
	abbreviate(initialLength, toAppendTo);
    }
}