Package com.ibm.fhir.database.utils.query.node

Class ExistsExpNode

java.lang.Object

com.ibm.fhir.database.utils.query.node.OperatorNode

com.ibm.fhir.database.utils.query.node.UnaryExpNode

com.ibm.fhir.database.utils.query.node.ExistsExpNode

All Implemented Interfaces:

ExpNode

public class ExistsExpNode
extends UnaryExpNode

Represents an EXISTS () clause in a SQL predicate expression

Constructor Summary

Constructors

Constructor	Description
ExistsExpNode(ExpNode sub)	Public constructor

Method Summary

Modifier and Type	Method	Description
boolean	isOperand()	Is this expression node an operand
int	precedence()	Precedence of this expression node.
<T> T	visit(ExpNodeVisitor<T> visitor)	Generic evaluation visitor

Methods inherited from class com.ibm.fhir.database.utils.query.node.UnaryExpNode

getExpr, popOperands, setExpr, toString

Methods inherited from class com.ibm.fhir.database.utils.query.node.OperatorNode

isOperator

Methods inherited from class java.lang.Object

clone, equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface com.ibm.fhir.database.utils.query.node.ExpNode

isLeftParen, isRightParen

Constructor Detail

ExistsExpNode

public ExistsExpNode(ExpNode sub)

Public constructor

Parameters:

sub -

Method Detail

visit

public <T> T visit(ExpNodeVisitor<T> visitor)

Description copied from interface: ExpNode

Generic evaluation visitor

Returns:

precedence

public int precedence()

Description copied from interface: ExpNode

Precedence of this expression node. Used to parse the expression into the correct tree. We use 0 to represent the highest precedence

Returns:

isOperand

public boolean isOperand()

Description copied from interface: ExpNode

Is this expression node an operand

Returns: