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Oracle Fusion Middleware Java API Reference for Oracle TopLink 11g Release 1 (11.1.1) E28847-01 |
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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.AbstractDoubleEncapsulatedExpression
org.eclipse.persistence.jpa.internal.jpql.parser.NullIfExpression
public final class NullIfExpression
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.
nullif_expression::= NULLIF(scalar_expression, scalar_expression)
Field Summary |
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Fields inherited from class org.eclipse.persistence.jpa.internal.jpql.parser.AbstractExpression |
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COMMA, DOT, DOUBLE_QUOTE, LEFT_CURLY_BRACKET, LEFT_PARENTHESIS, NOT_DEFINED, RIGHT_CURLY_BRACKET, RIGHT_PARENTHESIS, SINGLE_QUOTE, SPACE, UNDERSCORE |
Constructor Summary | |
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NullIfExpression(AbstractExpression parent) Creates a new NullIfExpression . |
Method Summary | |
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void |
accept(ExpressionVisitor visitor) Visits this Expression by the given visitor . |
JPQLQueryBNF |
getQueryBNF() Returns the BNF of this Expression . |
JPQLQueryBNF |
parameterExpressionBNF(int index) Returns the BNF to be used to parse one of the encapsulated expression. |
(package private) java.lang.String |
parseIdentifier(WordParser wordParser) Parses the identifier of this expression. |
Methods inherited from class org.eclipse.persistence.jpa.internal.jpql.parser.AbstractDoubleEncapsulatedExpression |
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acceptChildren, addChildrenTo, addOrderedEncapsulatedExpressionTo, buildCollectionExpression, getFirstExpression, getSecondExpression, hasComma, hasEncapsulatedExpression, hasFirstExpression, hasSecondExpression, hasSpaceAfterComma, isParsingComplete, parseEncapsulatedExpression, toParsedTextEncapsulatedExpression |
Methods inherited from class org.eclipse.persistence.jpa.internal.jpql.parser.AbstractEncapsulatedExpression |
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addOrderedChildrenTo, areLogicalIdentifiersSupported, getIdentifier, hasLeftParenthesis, hasRightParenthesis, parse, toParsedText |
Methods inherited from class org.eclipse.persistence.jpa.internal.jpql.parser.AbstractExpression |
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buildExpressionFromFallingBack, buildNullExpression, buildStringExpression, buildStringExpression, buildUnknownExpression, children, expressionFactory, expressionFactoryForIdentifier, findQueryBNF, getChildren, getJPAVersion, getParent, getRoot, getText, handleAggregate, identifierRole, identifiers, identifiers, identifierVersion, isAncestor, isIdentifier, isNull, isTolerant, isUnknown, isVirtual, orderedChildren, parse, parseSingleExpression, populatePosition, queryBNF, readdLeadingSpaces, rebuildActualText, rebuildParsedText, setParent, setText, shouldParseWithFactoryFirst, shouldSkipLiteral, toActualText, toParsedText, toString |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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NullIfExpression(AbstractExpression parent)
NullIfExpression
.
parent
- The parent of this expressionMethod Detail |
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public void accept(ExpressionVisitor visitor)
Expression
by the given visitor
.visitor
- The visitor
to visit this objectpublic JPQLQueryBNF getQueryBNF()
Expression
.getQueryBNF
in class AbstractExpression
JPQLQueryBNF
, which represents the grammar of this Expression
public JPQLQueryBNF parameterExpressionBNF(int index)
parameterExpressionBNF
in class AbstractDoubleEncapsulatedExpression
index
- The position of the encapsulated Expression
that needs to be parsed within the parenthesisjava.lang.String parseIdentifier(WordParser wordParser)
parseIdentifier
in class AbstractEncapsulatedExpression
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