EmptyCollectionComparisonNode

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

```
public class EmptyCollectionComparisonNode
extends SimpleConditionalExpressionNode
```
INTERNAL
Purpose: Used for the EMPTY collection handling
Responsibilities:
- Generate the correct expression for an IS EMPTY in EJBQL
Since:

August 2003

Author:

Jon Driscoll and Joel Lucuik

Field Summary

Fields
Modifier and Type Field Description

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

Constructor Summary

Constructors
Constructor Description

EmptyCollectionComparisonNode()
EmptyCollectionComparisonNode constructor comment.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`Expression`	`generateExpression(GenerationContext context)`	INTERNAL Return a EclipseLink expression for this node.
`void`	`indicateNot()`	INTERNAL Indicate if a NOT was found in the WHERE clause.
`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

- Field Detail
  - notIndicated
```
public boolean notIndicated
```
- Constructor Detail
  - EmptyCollectionComparisonNode
```
public EmptyCollectionComparisonNode()
```
    EmptyCollectionComparisonNode constructor comment.
- Method Detail
  - validate
```
public void validate(ParseTreeContext context)
```
    INTERNAL Validate node and calculate its type.
    
    Overrides:
    
    validate in class Node
  - generateExpression
```
public Expression generateExpression(GenerationContext context)
```
    INTERNAL Return a 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 emp.phoneNumbers IS NOT EMPTY