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    1   /*
    2    * Licensed to the Apache Software Foundation (ASF) under one or more
    3    * contributor license agreements.  See the NOTICE file distributed with
    4    * this work for additional information regarding copyright ownership.
    5    * The ASF licenses this file to You under the Apache License, Version 2.0
    6    * (the "License"); you may not use this file except in compliance with
    7    * the License.  You may obtain a copy of the License at
    8    *
    9    *      http://www.apache.org/licenses/LICENSE-2.0
    10   *
    11   * Unless required by applicable law or agreed to in writing, software
    12   * distributed under the License is distributed on an "AS IS" BASIS,
    13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    14   * See the License for the specific language governing permissions and
    15   * limitations under the License.
    16   */
    17
    18  package org.apache.log4j.pattern;
    19
    20  import org.apache.log4j.spi.LocationInfo;
    21  import org.apache.log4j.spi.LoggingEvent;
    22
    23
    24  /**
    25   * Return the event's line location information in a StringBuffer.
    26   *
    27   * @author Ceki G&uuml;lc&uuml;
    28   */
    29  public final class LineLocationPatternConverter
    30    extends LoggingEventPatternConverter {
    31    /**
    32     * Singleton.
    33     */
    34    private static final LineLocationPatternConverter INSTANCE =
    35      new LineLocationPatternConverter();
    36
    37    /**
    38     * Private constructor.
    39     */
    40    private LineLocationPatternConverter() {
    41      super("Line", "line");
    42    }
    43
    44    /**
    45     * Obtains an instance of pattern converter.
    46     * @param options options, may be null.
    47     * @return instance of pattern converter.
    48     */
    49    public static LineLocationPatternConverter newInstance(
    50      final String[] options) {
    51      return INSTANCE;
    52    }
    53
    54    /**
    55     * {@inheritDoc}
    56     */
    57    public void format(final LoggingEvent event, final StringBuffer output) {
    58      LocationInfo locationInfo = event.getLocationInformation();
    59
    60      if (locationInfo != null) {
    61        output.append(locationInfo.getLineNumber());
    62      }
    63    }
    64  }