Top Description Constructors Methods
org.eclipse.persistence.jpa.jpql.parser

public final Class CoalesceExpression

extends AbstractSingleEncapsulatedExpression
Class Inheritance
A COALESCE expression returns null if all its arguments evaluate to null, and the value of the first non-null argument otherwise.

The return type is the type returned by the arguments if they are all of the same type, otherwise it is undetermined.

BNF: coalesce_expression::= COALESCE(scalar_expression {, scalar_expression}+)
Author
Pascal Filion
Since
2.3
Version
2.5

Constructor Summary

AccessConstructor and Description
public
CoalesceExpression(AbstractExpression
The parent of this expression
parent)

Creates a new CoalesceExpression.

Method Summary

Modifier and TypeMethod and Description
public void
accept(ExpressionVisitor
The ExpressionVisitor to visit this object
visitor)

Implements org.eclipse.persistence.jpa.jpql.parser.Expression.accept.

Visits this Expression by the given visitor.
public String
getEncapsulatedExpressionQueryBNFId()

Implements abstract org.eclipse.persistence.jpa.jpql.parser.AbstractSingleEncapsulatedExpression.getEncapsulatedExpressionQueryBNFId.

Returns the BNF used to parse the encapsulated expression.
public JPQLQueryBNF
getQueryBNF()

Implements org.eclipse.persistence.jpa.jpql.parser.Expression.getQueryBNF.

Returns the BNF of this Expression.
Inherited from org.eclipse.persistence.jpa.jpql.parser.AbstractSingleEncapsulatedExpression:
acceptChildrenaddChildrenToaddOrderedEncapsulatedExpressionTofindQueryBNFgetExpressionhasEncapsulatedExpressionhasExpressionparseEncapsulatedExpressionremoveEncapsulatedExpressionsetExpressiontoParsedTextEncapsulatedExpression

Constructor Detail

CoalesceExpressionback to summary
public CoalesceExpression(AbstractExpression parent)

Creates a new CoalesceExpression.

Parameters
parent:AbstractExpression

The parent of this expression

Method Detail

acceptback to summary
public void accept(ExpressionVisitor visitor)

Implements org.eclipse.persistence.jpa.jpql.parser.Expression.accept.

Doc from org.eclipse.persistence.jpa.jpql.parser.Expression.accept.

Visits this Expression by the given visitor.

Parameters
visitor:ExpressionVisitor

The ExpressionVisitor to visit this object

Annotations
@Override
getEncapsulatedExpressionQueryBNFIdback to summary
public String getEncapsulatedExpressionQueryBNFId()

Implements abstract org.eclipse.persistence.jpa.jpql.parser.AbstractSingleEncapsulatedExpression.getEncapsulatedExpressionQueryBNFId.

Doc from org.eclipse.persistence.jpa.jpql.parser.AbstractSingleEncapsulatedExpression.getEncapsulatedExpressionQueryBNFId.

Returns the BNF used to parse the encapsulated expression.

Returns:String

The BNF used to parse the encapsulated expression

Annotations
@Override
getQueryBNFback to summary
public JPQLQueryBNF getQueryBNF()

Implements org.eclipse.persistence.jpa.jpql.parser.Expression.getQueryBNF.

Doc from org.eclipse.persistence.jpa.jpql.parser.Expression.getQueryBNF.

Returns the BNF of this Expression.

Returns:JPQLQueryBNF

The JPQLQueryBNF, which represents the grammar of this Expression

Annotations
@Override