org.eclipse.persistence.jpa.jpql.tools.resolver

Class FromSubqueryResolver

java.lang.Object

org.eclipse.persistence.jpa.jpql.tools.resolver.Resolver

org.eclipse.persistence.jpa.jpql.tools.resolver.FromSubqueryResolver

public class FromSubqueryResolver
extends Resolver

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

Since:

2.4

Version:

2.5

Author:

Pascal Filion

Constructor Summary

Constructors

Constructor and Description
FromSubqueryResolver(Resolver parent, JPQLQueryContext queryContext, SimpleSelectStatement subquery) Creates a new FromSubqueryResolver.

Method Summary

Modifier and Type	Method and Description
IManagedType	getManagedType() Returns the IManagedType associated with the field handled by this Resolver.

Methods inherited from class org.eclipse.persistence.jpa.jpql.tools.resolver.Resolver

addChild, getChild, getMapping, getParent, getParentManagedType, getParentMapping, getParentType, getParentTypeDeclaration, getProvider, getQuery, getType, getType, getType, getTypeDeclaration, getTypeHelper, getTypeRepository, isNullAllowed, setNullAllowed

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

FromSubqueryResolver

public FromSubqueryResolver(Resolver parent,
                            JPQLQueryContext queryContext,
                            SimpleSelectStatement subquery)

Creates a new FromSubqueryResolver.

Parameters:

parent - The parent of this resolver, which is never null

queryContext - The context used to query information about the application metadata and cached information

subquery -

Throws:

java.lang.NullPointerException - If the parent is null

Method Detail

getManagedType

public IManagedType getManagedType()

Returns the 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.

Overrides:

getManagedType in class Resolver

Returns:

Either the IManagedType, if it could be resolved; null otherwise