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Here is an example of a function that we use to logically remove the time portion of a date-time value, which is useful when you are doing things like counting the number of distinct dates when a particular event happened:
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function java.util.Date stripTimeComponent (java.util.Date dateTime) |
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{ |
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/* |
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Returns a new java.util.Date which contains only the year month day components of the submitted java.util.Date, |
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and sets the hours, minutes, seconds and milliseconds components to 0, which makes it reference midnight of that date. |
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Returns null if sent in null. |
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*/ |
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if (dateTime == null) |
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{
return null;
}
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{ return null; } org.opencds.common.utilities.DateUtility dateUtility = org.opencds.common.utilities.DateUtility.getInstance(); |
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String dateAsString = dateUtility.getDateAsString(dateTime, "yyyy-MM-dd"); |
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return dateUtility.getDateFromString(dateAsString, "yyyy-MM-dd"); |
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}
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} |
Most of the functions that we use for Drools were developed in the OpenCDS source code as java methods in the package opencds-guvnor-support/src/main/java/org/opencds/support/guvnor/GuvnorFunctionWorkup.java.