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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.JPQLQueryBNF
org.eclipse.persistence.jpa.internal.jpql.parser.GroupByItemBNF
public final class GroupByItemBNF
The query BNF for a group by item expression.
groupby_item ::= single_valued_path_expression | identification_variable
Field Summary | |
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static java.lang.String |
ID The unique identifier of this BNF rule. |
Constructor Summary | |
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GroupByItemBNF() Creates a new GroupByItemBNF . |
Method Summary | |
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(package private) java.lang.String |
getFallbackBNFId() When parsing the query and no JPQLQueryBNFs can help to parse the query, then it will fall back on this one. |
(package private) java.lang.String |
getFallbackExpressionFactoryId() Returns the unique identifier of the ExpressionFactory to use when the fall back BNF ID is not null . |
boolean |
handleAggregate() Determines whether the Expression handles a collection of sub-expressions that are aggregated by logical or arithmetic operators. |
boolean |
handleCollection() Determines whether the Expression handles a collection of sub-expressions that are separated by commas. |
(package private) void |
initialize() Initializes this BNF rule by registering child BNF rules and expression factories . |
Methods inherited from class org.eclipse.persistence.jpa.internal.jpql.parser.JPQLQueryBNF |
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addChildren, children, expressionFactory, expressionFactoryIds, getId, hasIdentifier, identifiers, isCompound, nonCompoundChildren, registerChild, registerExpressionFactory, toString |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Field Detail |
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public static final java.lang.String ID
Constructor Detail |
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GroupByItemBNF()
GroupByItemBNF
.Method Detail |
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java.lang.String getFallbackBNFId()
JPQLQueryBNFs
can help to parse the query, then it will fall back on this one.getFallbackBNFId
in class JPQLQueryBNF
JPQLQueryBNF
to use in the last resortjava.lang.String getFallbackExpressionFactoryId()
ExpressionFactory
to use when the fall back BNF ID is not null
. This will be used to parse a portion of the query when the registered expression factories
cannot parse it.
Note: This method is only called if JPQLQueryBNF.getFallbackBNFId()
does not return null
.
getFallbackExpressionFactoryId
in class JPQLQueryBNF
ExpressionFactory
public boolean handleAggregate()
Expression
handles a collection of sub-expressions that are aggregated by logical or arithmetic operators.handleAggregate
in class JPQLQueryBNF
true
if the sub-expression to parse might have several logical and/or arithmetic expressions; false
otherwisepublic boolean handleCollection()
Expression
handles a collection of sub-expressions that are separated by commas.handleCollection
in class JPQLQueryBNF
true
if the sub-expression to parse might have several sub-expressions separated by commas; false
otherwisevoid initialize()
BNF rules
and expression factories
.initialize
in class JPQLQueryBNF
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