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EclipseLink 2.4.2, build 'v20130514-5956486' API Reference | ||||||||
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java.lang.Object org.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.AggregateFunction org.eclipse.persistence.jpa.jpql.parser.CountFunction
public final class CountFunction
One of the aggregate functions. The return type of this function is a Long
.
expression ::= COUNT ([DISTINCT] identification_variable |
state_field_path_expression |
single_valued_object_path_expression)
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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CountFunction(AbstractExpression parent)
Creates a new CountFunction . |
Method Summary | |
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void |
accept(ExpressionVisitor visitor)
Visits this Expression by the given visitor . |
protected AbstractExpression |
buildEncapsulatedExpression(WordParser wordParser,
java.lang.String word)
Creates the AbstractExpression to represent the given word. |
java.lang.String |
encapsulatedExpressionBNF()
Returns the BNF used to parse the encapsulated expression. |
protected java.lang.String |
parseIdentifier(WordParser wordParser)
Parses the identifier of this expression. |
Methods inherited from class org.eclipse.persistence.jpa.jpql.parser.AggregateFunction |
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addOrderedEncapsulatedExpressionTo, getActualDistinctIdentifier, getQueryBNF, hasDistinct, hasSpaceAfterDistinct, parseEncapsulatedExpression, toParsedTextEncapsulatedExpression |
Methods inherited from class org.eclipse.persistence.jpa.jpql.parser.AbstractSingleEncapsulatedExpression |
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acceptChildren, addChildrenTo, findQueryBNF, getExpression, hasEncapsulatedExpression, hasExpression, removeEncapsulatedExpression, setExpression |
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 CountFunction(AbstractExpression parent)
CountFunction
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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 objectprotected AbstractExpression buildEncapsulatedExpression(WordParser wordParser, java.lang.String word)
AbstractExpression
to represent the given word.
buildEncapsulatedExpression
in class AggregateFunction
word
- The word that was parsed
AbstractExpression
public java.lang.String encapsulatedExpressionBNF()
encapsulatedExpressionBNF
in class AggregateFunction
protected java.lang.String parseIdentifier(WordParser wordParser)
parseIdentifier
in class AbstractEncapsulatedExpression
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