org.drools.time
Class TimeUtils
java.lang.Object
org.drools.time.TimeUtils
public class TimeUtils
- extends Object
A helper class with utility methods for
time related operations.
Method Summary |
static Interval[][] |
calculateTemporalDistance(Interval[][] constraintMatrix)
This method calculates the transitive closure of the given adjacency matrix
in order to find the temporal distance between each event represented in the
adjacency matrix. |
static long |
parseTimeString(String time)
Parses the given time String and returns the corresponding time
in milliseconds |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
TimeUtils
public TimeUtils()
calculateTemporalDistance
public static Interval[][] calculateTemporalDistance(Interval[][] constraintMatrix)
- This method calculates the transitive closure of the given adjacency matrix
in order to find the temporal distance between each event represented in the
adjacency matrix.
For more information on the calculation of the temporal distance, please refer
to the paper:
"Discarding Unused Temporal Information in a Production System", by Dan Teodosiu
and Gunter Pollak.
This method also uses an adaptation of the Floyd-Warshall algorithm to calculate
the transitive closure of the interval matrix. More information can be found here:
http://en.wikipedia.org/wiki/Floyd-Warshall_algorithm
The adaptation of the algorithm follows the definition of the path addition and
path intersection operations as defined in the paper previously mentioned. The
algorithm runs in O(n^3).
- Parameters:
constraintMatrix
- the starting adjacency matrix
- Returns:
- the resulting temporal distance matrix
parseTimeString
public static long parseTimeString(String time)
- Parses the given time String and returns the corresponding time
in milliseconds
- Parameters:
time
-
- Returns:
-
- Throws:
NullPointerException
- if time is null
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