TimeFormat


1   package JSci.text;
2   
3   import java.text.*;
4   import java.util.Date  ;
5   
6   /**
7   * The TimeFormat class formats a number as a date string,
8   * by first scaling the number and adding an offset,
9   * and then treating the result as a time in milliseconds.
10  * @version 1.0
11  * @author Mark Hale
12  */
13  public final class TimeFormat extends NumberFormat {
14          private DateFormat dateFormat;
15          private double scale;
16          private long offset;
17  
18          /**
19           * Constructs a TimeFormat object.
20           * @param offset in milliseconds.
21           */
22          public TimeFormat(DateFormat dateFormat, double scale, long offset) {
23                  this.dateFormat = dateFormat;
24                  this.scale = scale;
25                  this.offset = offset;
26          }
27          private Date   toDate(double x) {
28                  return new Date  (((long)(scale*x))+offset);
29          }
30          /**
31           */
32          public StringBuffer   format(double number, StringBuffer   toAppendTo, FieldPosition pos) {
33                  pos.setBeginIndex(-1);
34                  pos.setEndIndex(-1);
35                  return toAppendTo.append(dateFormat.format(toDate(number)));
36          }
37          public StringBuffer   format(long number, StringBuffer   toAppendTo, FieldPosition pos) {
38                  pos.setBeginIndex(-1);
39                  pos.setEndIndex(-1);
40                  return toAppendTo.append(dateFormat.format(toDate(number)));
41          }
42          private Number   toNumber(Date   date) {
43                  return new Double  ((date.getTime()-offset)/scale);
44          }
45          public Number   parse(String   text, ParsePosition parsePosition) {
46                  return toNumber(dateFormat.parse(text, parsePosition));
47          }
48  }
49  
50
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