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java.lang.Objectorg.eclipse.persistence.jpa.jpql.Resolver
org.eclipse.persistence.jpa.jpql.FromSubqueryResolver
public class FromSubqueryResolver
This Resolver wraps a subquery that is used as the "root" object in a query's declaration.
Example:
SELECT e.firstName
FROM Employee e, (SELECT count(e2), e2.firstName FROM Employee e2) e3
WHERE e.firstName = e3.firstName
| Nested Class Summary | |
|---|---|
protected class |
FromSubqueryResolver.VirtualManagedType
This IManagedType represents a virtual managed type where its content will be derived
from the subquery. |
protected class |
FromSubqueryResolver.VirtualMapping
This virtual IMapping wraps one of the select items. |
protected class |
FromSubqueryResolver.VirtualMappingBuilder
This visitor will traverse the SELECT clause and create virtual mappings
for the state field path expressions and any expression aliased with a result variable. |
| Constructor Summary | |
|---|---|
FromSubqueryResolver(Resolver parent,
JPQLQueryContext queryContext,
SimpleSelectStatement subquery)
Creates a new FromSubqueryResolver. |
|
| Method Summary | |
|---|---|
void |
accept(ResolverVisitor visitor)
Visits this Resolver by the given visitor. |
protected IType |
buildType()
Resolves the IType of the property handled by this Resolver. |
protected ITypeDeclaration |
buildTypeDeclaration()
Resolves the ITypeDeclaration of the property handled by this Resolver. |
IManagedType |
getManagedType()
Returns the IManagedType associated with the field handled by this Resolver. |
| Methods inherited from class org.eclipse.persistence.jpa.jpql.Resolver |
|---|
addChild, checkParent, getChild, getMapping, getParent, getParentManagedType, getParentMapping, getParentType, getParentTypeDeclaration, getProvider, getQuery, getType, getType, getType, getTypeDeclaration, getTypeHelper, getTypeRepository, isNullAllowed, setNullAllowed |
| Methods inherited from class java.lang.Object |
|---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Constructor Detail |
|---|
public FromSubqueryResolver(Resolver parent,
JPQLQueryContext queryContext,
SimpleSelectStatement subquery)
FromSubqueryResolver.
parent - The parent of this resolver, which is never nullqueryContext - The context used to query information about the application metadata and
cached informationsubquery -
java.lang.NullPointerException - If the parent is null| Method Detail |
|---|
public void accept(ResolverVisitor visitor)
Resolver by the given visitor.
accept in class Resolvervisitor - The visitor to visit this objectprotected IType buildType()
IType of the property handled by this Resolver.
buildType in class ResolverIType that was resolved by this Resolver or the IType for IType.UNRESOLVABLE_TYPE if it could not be resolvedprotected ITypeDeclaration buildTypeDeclaration()
ITypeDeclaration of the property handled by this Resolver.
buildTypeDeclaration in class ResolverITypeDeclaration that was resolved by this Resolver or the
ITypeDeclaration for IType.UNRESOLVABLE_TYPE if it could not be resolvedpublic IManagedType getManagedType()
IManagedType associated with the field handled by this Resolver.
If this Resolver does not handle a field that has a IManagedType, then
null should be returned.
For example: "SELECT e FROM Employee e", the Resolver for
e would be returning the IManagedType for Employee.
getManagedType in class ResolverIManagedType, if it could be resolved; null otherwise
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