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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.helpers;
    19
    20  import java.util.Date;
    21  import java.text.FieldPosition;
    22  import java.text.ParsePosition;
    23  import java.text.DateFormat;
    24
    25  /**
    26     Formats a {@link Date} by printing the number of milliseconds
    27     elapsed since construction of the format.  This is the fastest
    28     printing DateFormat in the package.
    29
    30     @author Ceki G&uuml;lc&uuml;
    31
    32     @since 0.7.5
    33  */
    34  public class RelativeTimeDateFormat extends DateFormat {
    35    private static final long serialVersionUID = 7055751607085611984L;
    36
    37
    38    protected final long startTime;
    39
    40    public
    41    RelativeTimeDateFormat() {
    42      this.startTime = System.currentTimeMillis();
    43    }
    44
    45    /**
    46       Appends to <code>sbuf</code> the number of milliseconds elapsed
    47       since the start of the application.
    48
    49       @since 0.7.5
    50    */
    51    public
    52    StringBuffer format(Date date, StringBuffer sbuf,
    53  		      FieldPosition fieldPosition) {
    54      //System.err.println(":"+ date.getTime() + " - " + startTime);
    55      return sbuf.append((date.getTime() - startTime));
    56    }
    57
    58    /**
    59       This method does not do anything but return <code>null</code>.
    60     */
    61    public
    62    Date parse(java.lang.String s, ParsePosition pos) {
    63      return null;
    64    }
    65  }