RelativeTimeDateFormat


1   /*
2    * Copyright 1999-2005 The Apache Software Foundation.
3    * 
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    * 
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    * 
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  
17  package org.apache.log4j.helpers;
18  
19  import java.util.Date  ;
20  import java.text.FieldPosition  ;
21  import java.text.ParsePosition  ;
22  import java.text.DateFormat  ;
23  
24  /**
25     Formats a {@link Date} by printing the number of milliseconds
26     elapsed since the start of the application.  This is the fastest
27     printing DateFormat in the package.
28     
29     @author Ceki G&uuml;lc&uuml;
30     
31     @since 0.7.5
32  */
33  public class RelativeTimeDateFormat extends DateFormat   {
34  
35    protected final long startTime;
36  
37    public
38    RelativeTimeDateFormat() {
39      this.startTime = System.currentTimeMillis();
40    }
41    
42    /**
43       Appends to <code>sbuf</code> the number of milliseconds elapsed
44       since the start of the application. 
45       
46       @since 0.7.5
47    */
48    public
49    StringBuffer   format(Date   date, StringBuffer   sbuf,
50                FieldPosition   fieldPosition) {
51      //System.err.println(":"+ date.getTime() + " - " + startTime);
52      return sbuf.append((date.getTime() - startTime));
53    }
54  
55    /**
56       This method does not do anything but return <code>null</code>.
57     */
58    public
59    Date   parse(java.lang.String   s, ParsePosition   pos) {
60      return null;
61    }  
62  }
63
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