Package org.cqframework.cql.elm.execution

Class SameOrBefore

java.lang.Object
org.opencds.cqf.cql.engine.elm.execution.Executable
org.cqframework.cql.elm.execution.Element
org.cqframework.cql.elm.execution.Expression
org.cqframework.cql.elm.execution.OperatorExpression
org.cqframework.cql.elm.execution.BinaryExpression
org.cqframework.cql.elm.execution.SameOrBefore
All Implemented Interfaces:
org.jvnet.jaxb2_commons.lang.Equals2, org.jvnet.jaxb2_commons.lang.HashCode2, org.jvnet.jaxb2_commons.lang.ToString2
Direct Known Subclasses:
SameOrBeforeEvaluator
public class SameOrBefore extends BinaryExpression implements org.jvnet.jaxb2_commons.lang.Equals2, org.jvnet.jaxb2_commons.lang.HashCode2, org.jvnet.jaxb2_commons.lang.ToString2
The SameOrBefore operator is defined for Date, DateTime, and Time values, as well as intervals. For the Interval overload, the SameOrBefore operator returns true if the first interval ends on or before the second one starts. In other words, if the ending point of the first interval is less than or equal to the starting point of the second interval, using the semantics described in the Start and End operators to determine interval boundaries. The SameOrBefore operator compares two Date, DateTime, or Time values to the specified precision to determine whether the first argument is the same or before the second argument. The comparison is performed by considering each precision in order, beginning with years (or hours for time values). If the values are the same, comparison proceeds to the next precision; if the first value is less than the second, the result is true; if the first value is greater than the second, the result is false; if either input has no value for the precision, the comparison stops and the result is null; if the specified precision has been reached, the comparison stops and the result is true. If no precision is specified, the comparison is performed beginning with years (or hours for time values) and proceeding to the finest precision specified in either input. For Date values, precision must be one of year, month, or day. For DateTime values, precision must be one of year, month, day, hour, minute, second, or millisecond. For Time values, precision must be one of hour, minute, second, or millisecond. Note specifically that due to variability in the way week numbers are determined, comparisons involving weeks are not supported. When comparing DateTime values with different timezone offsets, implementations should normalize to the timezone offset of the evaluation request timestamp, but only when the comparison precision is hours, minutes, seconds, or milliseconds. If either argument is null, the result is null.

Java class for SameOrBefore complex type.

The following schema fragment specifies the expected content contained within this class. 

 <complexType name="SameOrBefore">
   <complexContent>
     <extension base="{urn:hl7-org:elm:r1}BinaryExpression">
       <attribute name="precision" type="{urn:hl7-org:elm:r1}DateTimePrecision" />
     </extension>
   </complexContent>
 </complexType>