UnaryExpNode (IBM FHIR Server)

java.lang.Object
- com.ibm.fhir.database.utils.query.node.OperatorNode
- - com.ibm.fhir.database.utils.query.node.UnaryExpNode

All Implemented Interfaces:

ExpNode

Direct Known Subclasses:

ExistsExpNode, IsNotNullExpNode, IsNullExpNode, NotExistsExpNode, NotExpNode, ParenExpNode
```
public abstract class UnaryExpNode
extends OperatorNode
```
A unary expression

Constructor Summary

Constructors
Modifier	Constructor	Description
	`UnaryExpNode()`	Default public constructor (postponed initialization of the expr value)
`protected`	`UnaryExpNode(ExpNode expr)`	Protected constructor for immediate initialization by a subclass

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`ExpNode`	`getExpr()`
`void`	`popOperands(Stack<ExpNode> stack)`	Read the operands from the stack
`void`	`setExpr(ExpNode expr)`
`String`	`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, isOperand, isRightParen, precedence, visit

- Constructor Detail
  - UnaryExpNode
```
public UnaryExpNode()
```
    Default public constructor (postponed initialization of the expr value)
  - UnaryExpNode
```
protected UnaryExpNode(ExpNode expr)
```
    Protected constructor for immediate initialization by a subclass
    
    Parameters:
    
    expr -
- Method Detail
  - getExpr
```
public ExpNode getExpr()
```
    Returns:
    
    the expr
  - setExpr
```
public void setExpr(ExpNode expr)
```
    Parameters:
    
    expr - the expr to set
  - popOperands
```
public void popOperands(Stack<ExpNode> stack)
```
    Description copied from interface: ExpNode
    
    Read the operands from the stack
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class OperatorNode