Class NullIfExpression
java.lang.Object
org.eclipse.persistence.jpa.jpql.parser.AbstractExpression
org.eclipse.persistence.jpa.jpql.parser.AbstractEncapsulatedExpression
org.eclipse.persistence.jpa.jpql.parser.AbstractDoubleEncapsulatedExpression
org.eclipse.persistence.jpa.jpql.parser.NullIfExpression
- All Implemented Interfaces:
Expression
NULLIF returns the first expression if the two expressions are not equal. If the
expressions are equal, NULLIF returns a null value of the type of the first expression.
NULLIF is equivalent to a searched CASE expression in which the two expressions are equal and the resulting expression is NULL.
Returns the same type as the first expression.
BNF:
nullif_expression::= NULLIF(scalar_expression, scalar_expression)
- Since:
- 2.3
- Version:
- 2.5
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Field Summary
Fields inherited from class org.eclipse.persistence.jpa.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.jpql.parser.Expression
ABS, ALL, AND, ANY, AS, AS_OF, ASC, AVG, BETWEEN, BIT_LENGTH, BOTH, CASE, CAST, CEILING, CHAR_LENGTH, CHARACTER_LENGTH, CLASS, COALESCE, COLUMN, CONCAT, CONNECT_BY, COUNT, CURRENT_DATE, CURRENT_TIME, CURRENT_TIMESTAMP, DATE, DATETIME, DELETE, DELETE_FROM, DESC, DIFFERENT, DISTINCT, DIVISION, ELSE, EMPTY, END, ENTRY, EQUAL, ESCAPE, EXCEPT, EXISTS, EXP, EXTRACT, FALSE, FETCH, FIRST, FLOOR, FROM, FUNC, FUNCTION, GREATER_THAN, GREATER_THAN_OR_EQUAL, GROUP_BY, HAVING, IN, INDEX, INNER, INNER_JOIN, INNER_JOIN_FETCH, INTERSECT, IS, IS_EMPTY, IS_NOT_EMPTY, IS_NOT_NULL, IS_NULL, JOIN, JOIN_FETCH, KEY, LAST, LEADING, LEFT, LEFT_JOIN, LEFT_JOIN_FETCH, LEFT_OUTER_JOIN, LEFT_OUTER_JOIN_FETCH, LENGTH, LIKE, LN, LOCAL, LOCATE, LOWER, LOWER_THAN, LOWER_THAN_OR_EQUAL, MAX, MEMBER, MEMBER_OF, MIN, MINUS, MOD, MULTIPLICATION, NAMED_PARAMETER, NEW, NOT, NOT_BETWEEN, NOT_EQUAL, NOT_EXISTS, NOT_IN, NOT_LIKE, NOT_MEMBER, NOT_MEMBER_OF, NULL, NULLIF, NULLS, NULLS_FIRST, NULLS_LAST, OBJECT, OF, ON, OPERATOR, OR, ORDER_BY, ORDER_SIBLINGS_BY, OUTER, PLUS, POSITION, POSITIONAL_PARAMETER, POWER, QUOTE, REGEXP, ROUND, SCN, SELECT, SET, SIGN, SIZE, SOME, SQL, SQRT, START_WITH, SUBSTRING, SUM, TABLE, THEN, TIME, TIMESTAMP, TRAILING, TREAT, TRIM, TRUE, TYPE, UNION, UNKNOWN, UPDATE, UPPER, VALUE, WHEN, WHERE
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Constructor Summary
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Method Summary
Modifier and TypeMethodDescriptionvoid
accept
(ExpressionVisitor visitor) Visits thisExpression
by the givenvisitor
.Returns the BNF of thisExpression
.parameterExpressionBNF
(int index) Returns the BNF to be used to parse one of the encapsulated expression.Methods inherited from class org.eclipse.persistence.jpa.jpql.parser.AbstractDoubleEncapsulatedExpression
acceptChildren, addChildrenTo, addOrderedEncapsulatedExpressionTo, buildCollectionExpression, findQueryBNF, getFirstExpression, getSecondExpression, hasComma, hasEncapsulatedExpression, hasFirstExpression, hasSecondExpression, hasSpaceAfterComma, isParsingComplete, isSecondExpressionOptional, parseEncapsulatedExpression, removeEncapsulatedExpression, toParsedTextEncapsulatedExpression
Methods inherited from class org.eclipse.persistence.jpa.jpql.parser.AbstractEncapsulatedExpression
addOrderedChildrenTo, areLogicalIdentifiersSupported, getActualIdentifier, getIdentifier, hasLeftParenthesis, hasRightParenthesis, hasSpaceAfterIdentifier, parse, shouldParseRightParenthesis, toParsedText
Methods inherited from class org.eclipse.persistence.jpa.jpql.parser.AbstractExpression
acceptUnknownVisitor, acceptUnknownVisitor, buildExpressionFromFallingBack, buildNullExpression, buildStringExpression, buildStringExpression, buildUnknownExpression, calculatePosition, children, findFallBackExpressionFactory, getExpressionFactory, getExpressionRegistry, getGrammar, getIdentifierVersion, getJPAVersion, getLength, getOffset, getParent, getQueryBNF, getRoot, getText, handleAggregate, handleCollection, isAncestor, isIdentifier, isNull, isTolerant, isUnknown, isVirtual, orderedChildren, parse, parseUsingExpressionFactory, populatePosition, rebuildActualText, rebuildParsedText, setParent, setText, shouldParseWithFactoryFirst, shouldSkipLiteral, toActualText, toParsedText, toString
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Constructor Details
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NullIfExpression
Creates a newNullIfExpression
.- Parameters:
parent
- The parent of this expression
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Method Details
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accept
Description copied from interface:Expression
Visits thisExpression
by the givenvisitor
.- Parameters:
visitor
- TheExpressionVisitor
to visit this object
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getQueryBNF
Description copied from interface:Expression
Returns the BNF of thisExpression
.- Returns:
- The
JPQLQueryBNF
, which represents the grammar of thisExpression
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parameterExpressionBNF
Description copied from class:AbstractDoubleEncapsulatedExpression
Returns the BNF to be used to parse one of the encapsulated expression.- Specified by:
parameterExpressionBNF
in classAbstractDoubleEncapsulatedExpression
- Parameters:
index
- The position of the encapsulatedExpression
that needs to be parsed within the parenthesis, which starts at position 0- Returns:
- The BNF to be used to parse one of the encapsulated expression
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