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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.LoggingEvent;
    21
    22
    23  /**
    24   * Formats the event sequence number.
    25   *
    26   * @author Ceki G&uuml;lc&uuml;
    27   */
    28  public class SequenceNumberPatternConverter
    29    extends LoggingEventPatternConverter {
    30    /**
    31     * Singleton.
    32     */
    33    private static final SequenceNumberPatternConverter INSTANCE =
    34      new SequenceNumberPatternConverter();
    35
    36    /**
    37     * Private constructor.
    38     */
    39    private SequenceNumberPatternConverter() {
    40      super("Sequence Number", "sn");
    41    }
    42
    43    /**
    44     * Obtains an instance of SequencePatternConverter.
    45     * @param options options, currently ignored, may be null.
    46     * @return instance of SequencePatternConverter.
    47     */
    48    public static SequenceNumberPatternConverter newInstance(
    49      final String[] options) {
    50      return INSTANCE;
    51    }
    52
    53    /**
    54     * {@inheritDoc}
    55     */
    56    public void format(final LoggingEvent event, final StringBuffer toAppendTo) {
    57      toAppendTo.append("0");
    58    }
    59  }