Package org.linuxforhealth.fhir.database.utils.query.node

Class ColumnExpNode

java.lang.Object

org.linuxforhealth.fhir.database.utils.query.node.ColumnExpNode

All Implemented Interfaces:

ExpNode

public class ColumnExpNode
extends java.lang.Object
implements ExpNode

Represents a reference to a table column or alias in an expression

Field Summary

Fields

Modifier and Type	Field	Description
(package private) java.lang.String	columnName
(package private) java.lang.String	tableAlias

Constructor Summary

Constructors

Constructor	Description
ColumnExpNode(java.lang.String columnName)	Public constructor
ColumnExpNode(java.lang.String tableAlias, java.lang.String columnName)	Public constructor

Method Summary

Modifier and Type	Method	Description
boolean	isOperand()	Is this expression node an operand
void	popOperands(java.util.Stack<ExpNode> stack)	Read the operands from the stack
int	precedence()	Precedence of this expression node.
java.lang.String	toString()
<T> T	visit(ExpNodeVisitor<T> visitor)	Generic evaluation visitor

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.linuxforhealth.fhir.database.utils.query.node.ExpNode

isLeftParen, isOperator, isRightParen

Field Detail

tableAlias

final java.lang.String tableAlias

columnName

final java.lang.String columnName

Constructor Detail

ColumnExpNode

public ColumnExpNode(java.lang.String columnName)

Public constructor

Parameters:

columnName -

ColumnExpNode

public ColumnExpNode(java.lang.String tableAlias,
                     java.lang.String columnName)

Public constructor

Parameters:

tableAlias -

columnName -

Method Detail

visit

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

Description copied from interface: ExpNode

Generic evaluation visitor

Specified by:

visit in interface ExpNode

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

Specified by:

precedence in interface ExpNode

Returns:

popOperands

public void popOperands(java.util.Stack<ExpNode> stack)

Description copied from interface: ExpNode

Read the operands from the stack

Specified by:

popOperands in interface ExpNode

isOperand

public boolean isOperand()

Description copied from interface: ExpNode

Is this expression node an operand

Specified by:

isOperand in interface ExpNode

Returns:

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object