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java.lang.Objectorg.eclipse.persistence.jpa.jpql.model.query.AbstractStateObject
org.eclipse.persistence.jpa.jpql.model.query.AbstractListHolderStateObject<VariableDeclarationStateObject>
org.eclipse.persistence.jpa.jpql.model.query.AbstractFromClauseStateObject
org.eclipse.persistence.jpa.jpql.model.query.FromClauseStateObject
public class FromClauseStateObject
The FROM
clause of a query defines the domain of the query by declaring
identification variables. An identification variable is an identifier declared in the
FROM
clause of a query. The domain of the query may be constrained by path
expressions. Identification variables designate instances of a particular entity abstract schema
type. The FROM
clause can contain multiple identification variable
declarations separated by a comma (,).
BNF: from_clause ::= FROM identification_variable_declaration {, {identification_variable_declaration | collection_member_declaration}}*
CollectionMemberDeclarationStateObject
,
IdentificationVariableDeclarationStateObject
,
JoinStateObject
,
SelectStatementStateObject
,
FromClause
Field Summary |
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Fields inherited from class org.eclipse.persistence.jpa.jpql.model.query.AbstractFromClauseStateObject |
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VARIABLE_DECLARATIONS_LIST |
Constructor Summary | |
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FromClauseStateObject(SelectStatementStateObject parent)
Creates a new FromClauseStateObject . |
Method Summary | |
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void |
accept(StateObjectVisitor visitor)
Visits this StateObject by the given visitor . |
protected java.lang.String |
declarationBNF()
Returns the BNF of the declaration part of this clause. |
IManagedType |
findManagedType(StateObject stateObject)
Returns the IManagedType for the given identification variable. |
FromClause |
getExpression()
Returns the actual parsed object if this StateObject representation of the JPQL query
was created by parsing an existing JPQL query. |
SelectStatementStateObject |
getParent()
Returns the parent of this StateObject . |
void |
setExpression(FromClause expression)
Keeps a reference of the parsed object object, which should only be done
when this object is instantiated during the conversion of a parsed JPQL query into StateObjects . |
Methods inherited from class org.eclipse.persistence.jpa.jpql.model.query.AbstractFromClauseStateObject |
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addCollectionDeclaration, addCollectionDeclaration, addProblems, addRangeDeclaration, addRangeDeclaration, addRangeDeclaration, declarations, findIdentificationVariable, getDeclaration, getManagedType, identificationVariables, isEquivalent, listName, parse, toTextInternal |
Methods inherited from class org.eclipse.persistence.jpa.jpql.model.query.AbstractListHolderStateObject |
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addChildren, addItem, addItems, addListChangeListener, areChildrenEquivalent, canMoveDown, canMoveUp, getItem, hasItems, initialize, items, itemsSize, moveDown, moveUp, removeItem, removeItems, removeListChangeListener, toStringItems |
Methods inherited from class org.eclipse.persistence.jpa.jpql.model.query.AbstractStateObject |
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acceptUnknownVisitor, acceptUnknownVisitor, addPropertyChangeListener, areEquivalent, buildProblem, buildProblem, buildStateObject, buildStateObjects, checkParent, children, decorate, equals, firePropertyChanged, getChangeSupport, getDecorator, getGrammar, getManagedTypeProvider, getQueryBuilder, getRoot, getType, getType, getTypeHelper, getTypeRepository, hashCode, isDecorated, parent, parent, parent, removePropertyChangeListener, setExpression, setParent, toString, toString, toStringInternal, toStringItems, toText |
Methods inherited from class java.lang.Object |
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clone, finalize, getClass, notify, notifyAll, wait, wait, wait |
Methods inherited from interface org.eclipse.persistence.jpa.jpql.model.query.StateObject |
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addPropertyChangeListener, children, decorate, getDecorator, getGrammar, getManagedTypeProvider, getQueryBuilder, getRoot, isDecorated, removePropertyChangeListener, setParent, toString, toText |
Constructor Detail |
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public FromClauseStateObject(SelectStatementStateObject parent)
FromClauseStateObject
.
parent
- The parent of this state object, which cannot be null
java.lang.NullPointerException
- The given parent cannot be null
Method Detail |
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public void accept(StateObjectVisitor visitor)
StateObject
by the given visitor
.
visitor
- The visitor
to visit this objectprotected java.lang.String declarationBNF()
declarationBNF
in class AbstractFromClauseStateObject
public IManagedType findManagedType(StateObject stateObject)
IManagedType
for the given identification variable. If the declaration is
for a subquery and there is no managed type associated with the identification then the search
will traverse up the query hierarchy.
SELECT e FROM Department d JOIN KEY(d.employees).addresses a
In the above query, the managed type associated with the identification variable:
stateObject
- The StateObject
that should be an simple identification variable or
an encapsulated identification variable with the identifier KEY
or
VALUE
IManagedType
representing the domain object declared by the given
identification variableDeclarationStateObject.getManagedType(StateObject)
public FromClause getExpression()
StateObject
representation of the JPQL query
was created by parsing an existing JPQL query.
getExpression
in interface StateObject
getExpression
in class AbstractFromClauseStateObject
StateObject
or null
when the JPQL query is manually created (i.e. not from a string)public SelectStatementStateObject getParent()
StateObject
.
getParent
in interface StateObject
getParent
in class AbstractFromClauseStateObject
StateObject
, which is null
only when
this is the root of the hierarchypublic void setExpression(FromClause expression)
parsed object
object, which should only be done
when this object is instantiated during the conversion of a parsed JPQL query into StateObjects
.
expression
- The parsed object
representing a FROM
expression
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EclipseLink 2.4.2, build 'v20130514-5956486' API Reference | ||||||||
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