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java.lang.Objectorg.eclipse.persistence.jpa.jpql.parser.AbstractExpression
org.eclipse.persistence.jpa.jpql.parser.AbstractEncapsulatedExpression
org.eclipse.persistence.jpa.jpql.parser.AbstractSingleEncapsulatedExpression
org.eclipse.persistence.jpa.jpql.parser.ExistsExpression
public final class ExistsExpression
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.
exists_expression ::= [NOT] EXISTS(subquery)
Field Summary |
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Fields inherited from class org.eclipse.persistence.jpa.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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ExistsExpression(AbstractExpression parent)
Creates a new ExistsExpression . |
Method Summary | |
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void |
accept(ExpressionVisitor visitor)
Visits this Expression by the given visitor . |
java.lang.String |
encapsulatedExpressionBNF()
Returns the BNF used to parse the encapsulated expression. |
java.lang.String |
getActualNotIdentifier()
Returns the actual NOT identifier found in the string representation of the JPQL query, which has the actual case that was used. |
JPQLQueryBNF |
getQueryBNF()
Returns the BNF of this Expression . |
boolean |
hasNot()
Determines whether the identifier NOT was parsed. |
protected AbstractExpression |
parse(WordParser wordParser,
java.lang.String queryBNFId,
boolean tolerant)
Parses the given text by using the specified BNF. |
protected java.lang.String |
parseIdentifier(WordParser wordParser)
Parses the identifier of this expression. |
Methods inherited from class org.eclipse.persistence.jpa.jpql.parser.AbstractSingleEncapsulatedExpression |
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acceptChildren, addChildrenTo, addOrderedEncapsulatedExpressionTo, findQueryBNF, getExpression, hasEncapsulatedExpression, hasExpression, parseEncapsulatedExpression, removeEncapsulatedExpression, setExpression, toParsedTextEncapsulatedExpression |
Methods inherited from class org.eclipse.persistence.jpa.jpql.parser.AbstractEncapsulatedExpression |
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addOrderedChildrenTo, areLogicalIdentifiersSupported, getActualIdentifier, getIdentifier, hasLeftParenthesis, hasRightParenthesis, hasSpaceAfterIdentifier, isParsingComplete, parse, shouldParseRightParenthesis, toParsedText |
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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public ExistsExpression(AbstractExpression parent)
ExistsExpression
.
parent
- The parent of this expressionMethod Detail |
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public void accept(ExpressionVisitor visitor)
Expression
by the given visitor
.
visitor
- The ExpressionVisitor
to visit this objectpublic java.lang.String encapsulatedExpressionBNF()
encapsulatedExpressionBNF
in class AbstractSingleEncapsulatedExpression
public java.lang.String getActualNotIdentifier()
public JPQLQueryBNF getQueryBNF()
Expression
.
JPQLQueryBNF
, which represents the grammar of this Expression
public boolean hasNot()
true
if the identifier NOT was parsed; false
otherwiseprotected AbstractExpression parse(WordParser wordParser, java.lang.String queryBNFId, boolean tolerant)
parse
in class AbstractExpression
wordParser
- The text to parse based on the current position of the cursorqueryBNFId
- The unique identifier of the JPQLQueryBNF
that is used to determine
how to parse the text at the current cursor position within the JPQL querytolerant
- Determines whether the parsing system should be tolerant, meaning if it should
try to parse invalid or incomplete queries
Expression
representing the given sub-queryprotected java.lang.String parseIdentifier(WordParser wordParser)
parseIdentifier
in class AbstractEncapsulatedExpression
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