ExistsNode

java.lang.Object
- org.eclipse.persistence.internal.jpa.parsing.Node
- - org.eclipse.persistence.internal.jpa.parsing.ExistsNode

```
public class ExistsNode
extends Node
```
INTERNAL
Purpose: Represent an EXISTS subquery.

Field Summary
- Fields inherited from class org.eclipse.persistence.internal.jpa.parsing.Node
  alias, left, right, shouldGenerateExpression

Constructor Summary

Constructors
Constructor Description

ExistsNode()
Return a new ExistsNode.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`Expression`	`generateExpression(GenerationContext context)`	INTERNAL Generate the EclipseLink expression for this node
`void`	`indicateNot()`	INTERNAL Indicate if a NOT was found in the WHERE clause.
`boolean`	`notIndicated()`
`void`	`validate(ParseTreeContext context)`	INTERNAL Validate node and calculate its type.

Methods inherited from class org.eclipse.persistence.internal.jpa.parsing.Node
addToExpression, appendExpression, applyToQuery, getAlias, getAsString, getColumn, getLeft, getLine, getRight, getType, hasLeft, hasRight, isAggregateNode, isAliasableNode, isAttributeNode, isConstructorNode, isCountNode, isDivideNode, isDotNode, isEscape, isLiteralNode, isMapKeyNode, isMinusNode, isMultiplyNode, isNotNode, isParameterNode, isPlusNode, isSubqueryNode, isVariableNode, qualifyAttributeAccess, resolveAttribute, resolveClass, resolveClass, resolveMapping, resolveMapping, setAlias, setColumn, setLeft, setLine, setRight, setType, toString, toString, toStringDisplayName, toStringIndent, validateParameter

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Constructor Detail
  - ExistsNode
```
public ExistsNode()
```
    Return a new ExistsNode.
- Method Detail
  - validate
```
public void validate(ParseTreeContext context)
```
    INTERNAL Validate node and calculate its type. Change subquery SELECT clause.
    
    Overrides:
    
    validate in class Node
  - generateExpression
```
public Expression generateExpression(GenerationContext context)
```
    INTERNAL Generate the EclipseLink expression for this node
    
    Overrides:
    
    generateExpression in class Node
  - indicateNot
```
public void indicateNot()
```
    INTERNAL Indicate if a NOT was found in the WHERE clause. Examples: WHERE ... NOT EXISTS(...)
  - notIndicated
```
public boolean notIndicated()
```