Package org.cqframework.cql.elm.execution

Class Except

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.NaryExpression
org.cqframework.cql.elm.execution.Except
All Implemented Interfaces:
org.jvnet.jaxb2_commons.lang.Equals2, org.jvnet.jaxb2_commons.lang.HashCode2, org.jvnet.jaxb2_commons.lang.ToString2
Direct Known Subclasses:
ExceptEvaluator
public class Except extends NaryExpression implements org.jvnet.jaxb2_commons.lang.Equals2, org.jvnet.jaxb2_commons.lang.HashCode2, org.jvnet.jaxb2_commons.lang.ToString2
The Except operator returns the set difference of the two arguments. This operator has two overloads: List, List Interval, Interval For the list overload, this operator returns a list with the elements that appear in the first operand, that do not appear in the second operand, using equality semantics, with the exception that null elements are considered equal for the purposes of determining the result. The operator is defined with set semantics, meaning that each element will appear in the result at most once, and that there is no expectation that the order of the inputs will be preserved in the results. For the interval overload, this operator returns the portion of the first interval that does not overlap with the second. If the second argument is properly contained within the first and does not start or end it, this operator returns null. If the first argument is null, the result is null. If the second argument is null, the operation is performed as though the second argument was an empty list.

Java class for Except complex type.

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

 <complexType name="Except">
   <complexContent>
     <extension base="{urn:hl7-org:elm:r1}NaryExpression">
     </extension>
   </complexContent>
 </complexType>