org.eclipse.persistence.jpa.internal.jpql.parser

Class ExistsExpression

java.lang.Object

org.eclipse.persistence.jpa.internal.jpql.parser.StringExpression

org.eclipse.persistence.jpa.internal.jpql.parser.AbstractExpression

org.eclipse.persistence.jpa.internal.jpql.parser.AbstractEncapsulatedExpression

org.eclipse.persistence.jpa.internal.jpql.parser.AbstractSingleEncapsulatedExpression

org.eclipse.persistence.jpa.internal.jpql.parser.ExistsExpression

All Implemented Interfaces:

Expression

public final class ExistsExpression
extends AbstractSingleEncapsulatedExpression

An EXISTS expression is a predicate that is true only if the result of the subquery consists of one or more values and that is false otherwise.

BNF: exists_expression ::= [NOT] EXISTS(subquery)

Since:

2.3

Version:

2.3

Author:

Pascal Filion

Field Summary

Fields inherited from class org.eclipse.persistence.jpa.internal.jpql.parser.AbstractExpression

COMMA, DOT, DOUBLE_QUOTE, LEFT_CURLY_BRACKET, LEFT_PARENTHESIS, NOT_DEFINED, RIGHT_CURLY_BRACKET, RIGHT_PARENTHESIS, SINGLE_QUOTE, SPACE, UNDERSCORE

Fields inherited from interface org.eclipse.persistence.jpa.internal.jpql.parser.Expression

ABS, ALL, AND, ANY, AS, ASC, AVG, BETWEEN, BIT_LENGTH, BOTH, CASE, CHAR_LENGTH, CHARACTER_LENGTH, CLASS, COALESCE, CONCAT, COUNT, CURRENT_DATE, CURRENT_TIME, CURRENT_TIMESTAMP, DELETE, DELETE_FROM, DESC, DIFFERENT, DISTINCT, DIVISION, ELSE, EMPTY, END, ENTRY, EQUAL, ESCAPE, EXISTS, FALSE, FETCH, FROM, FUNC, GREATER_THAN, GREATER_THAN_OR_EQUAL, GROUP_BY, HAVING, IN, INDEX, INNER, INNER_JOIN, INNER_JOIN_FETCH, IS, IS_EMPTY, IS_NOT_EMPTY, IS_NOT_NULL, IS_NULL, JOIN, JOIN_FETCH, KEY, LEADING, LEFT, LEFT_JOIN, LEFT_JOIN_FETCH, LEFT_OUTER_JOIN, LEFT_OUTER_JOIN_FETCH, LENGTH, LIKE, LOCATE, LOWER, LOWER_THAN, LOWER_THAN_OR_EQUAL, MAX, MEMBER, MEMBER_OF, MIN, MINUS, MOD, MULTIPLICATION, NAMED_PARAMETER, NEW, NOT, NOT_BETWEEN, NOT_EXISTS, NOT_IN, NOT_LIKE, NOT_MEMBER, NOT_MEMBER_OF, NULL, NULLIF, OBJECT, OF, OR, ORDER_BY, OUTER, PLUS, POSITION, POSITIONAL_PARAMETER, QUOTE, SELECT, SET, SIZE, SOME, SQRT, SUBSTRING, SUM, THEN, TRAILING, TREAT, TRIM, TRUE, TYPE, UNKNOWN, UPDATE, UPPER, VALUE, WHEN, WHERE

Method Summary

Methods

Modifier and Type	Method and Description
void	accept(ExpressionVisitor visitor) Visits this Expression by the given visitor.
java.lang.String	encapsulatedExpressionBNF() Returns the BNF used to parse the encapsulated expression.
JPQLQueryBNF	getQueryBNF() Returns the BNF of this Expression.
boolean	hasNot() Determines whether the identifier NOT was parsed.

Methods inherited from class org.eclipse.persistence.jpa.internal.jpql.parser.AbstractSingleEncapsulatedExpression

acceptChildren, getExpression, hasEncapsulatedExpression, hasExpression

Methods inherited from class org.eclipse.persistence.jpa.internal.jpql.parser.AbstractEncapsulatedExpression

getIdentifier, hasLeftParenthesis, hasRightParenthesis

Methods inherited from class org.eclipse.persistence.jpa.internal.jpql.parser.AbstractExpression

children, findQueryBNF, getChildren, getParent, getRoot, identifierRole, identifiers, identifierVersion, isAncestor, isIdentifier, isVirtual, orderedChildren, queryBNF, toActualText, toParsedText, toString

Methods inherited from class java.lang.Object

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

Method Detail

accept

public void accept(ExpressionVisitor visitor)

Visits this Expression by the given visitor.

Parameters:

visitor - The visitor to visit this object

encapsulatedExpressionBNF

public java.lang.String encapsulatedExpressionBNF()

Returns the BNF used to parse the encapsulated expression.

Specified by:

encapsulatedExpressionBNF in class AbstractSingleEncapsulatedExpression

Returns:

The BNF used to parse the encapsulated expression

getQueryBNF

public JPQLQueryBNF getQueryBNF()

Returns the BNF of this Expression.

Specified by:

getQueryBNF in class AbstractExpression

Returns:

The JPQLQueryBNF, which represents the grammar of this Expression

hasNot

public boolean hasNot()

Determines whether the identifier NOT was parsed.

Returns:

true if the identifier NOT was parsed; false otherwise