001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache license, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the license for the specific language governing permissions and
015 * limitations under the license.
016 */
017package org.apache.logging.log4j.core.pattern;
018
019import org.apache.logging.log4j.core.LogEvent;
020import org.apache.logging.log4j.core.config.plugins.Plugin;
021
022/**
023 * Returns the event's line location information in a StringBuilder.
024 */
025@Plugin(name = "LineLocationPatternConverter", category = PatternConverter.CATEGORY)
026@ConverterKeys({ "L", "line" })
027public final class LineLocationPatternConverter extends LogEventPatternConverter {
028    /**
029     * Singleton.
030     */
031    private static final LineLocationPatternConverter INSTANCE =
032        new LineLocationPatternConverter();
033
034    /**
035     * Private constructor.
036     */
037    private LineLocationPatternConverter() {
038        super("Line", "line");
039    }
040
041    /**
042     * Obtains an instance of pattern converter.
043     *
044     * @param options options, may be null.
045     * @return instance of pattern converter.
046     */
047    public static LineLocationPatternConverter newInstance(
048        final String[] options) {
049        return INSTANCE;
050    }
051
052    /**
053     * {@inheritDoc}
054     */
055    @Override
056    public void format(final LogEvent event, final StringBuilder output) {
057        final StackTraceElement element = event.getSource();
058
059        if (element != null) {
060            output.append(element.getLineNumber());
061        }
062    }
063}