Using the INTERVAL type

When calling a Java method with an expression evaluating to an INTERVAL, the runtime system converts the INTERVAL value to an instance of the com.fourjs.fgl.lang.FglInterval class implemented in $FGLDIR/lib/fgl.jar. You can then manipulate the INTERVAL from within the Java code.

You must add $FGLDIR/lib/fgl.jar to the class path in order to compile Java code with com.fourjs.fgl.lang.FglInterval class.

The com.fourjs.fgl.lang.FglInterval class implements the following:

Table 1. Fields of the com.fourjs.fgl.lang.FglInterval class
Field Description
final static int YEAR
Time qualifier for year
final static int MONTH
Time qualifier for month
final static int DAY
Time qualifier for day
final static int HOUR
Time qualifier for hour
final static int MINUTE
Time qualifier for minute
final static int SECOND
Time qualifier for second
final static int FRACTION
Time qualifier for fraction (start qualifier)
final static int FRACTION1
Time qualifier for fraction(1) (end qualifier)
final static int FRACTION2
Time qualifier for fraction(2) (end qualifier)
final static int FRACTION3
Time qualifier for fraction(3) (end qualifier)
final static int FRACTION4
Time qualifier for fraction(4) (end qualifier)
final static int FRACTION5
Time qualifier for fraction(5) (end qualifier)
Table 2. Methods of the com.fourjs.fgl.lang.FglInterval class
Methods Description
static int encodeTypeQualifier(
  int startUnit,
  int length,
  int endUnit))
Returns the encoded type qualifier for an interval with to interval qualifiers and length passed:

encoded qualifier = (length * 256) + (startUnit * 16) + endUnit

Where length defines the total number of significant digits in this time data.

For example, with INTERVAL DAY(5) TO FRACTION3:

startUnit = DAY

length = 13 (DDDDhhmmssfff)

endUnit = FRACTION3

java.lang.String toString()
Converts the INTERVAL value to a String object representing an interval in default format.
static FglInterval valueOf(
  java.lang.String val)

Creates a new FglInterval object from a String object representing an interval value in the format:

DD hh:mm:ss.fff

static FglInterval valueOf(
  java.lang.String val,
  int startUnit,
  int endUnit)
Creates a new FglDateTime object from a String object representing an interval value in standard format, using the qualifiers and precision passed as parameter.
In the Java code, you can pass a com.fourjs.fgl.lang.FglInterval object as in this example:
public static void useInterval(FglInterval inv) throws ParseException {
    String s = inv.toString();
If you need to create a com.fourjs.fgl.lang.FglInterval object in your program, you can use the valueOf() class method as in this example:
IMPORT JAVA com.fourjs.fgl.lang.FglInterval
  DEFINE inv com.fourjs.fgl.lang.FglInterval
  LET inv = FglInterval.valueOf("-510 12:33:45.123")
  DISPLAY inv.toString()