org.eclipse.persistence.jpa.jpql

Class SubqueryEntityResolver

java.lang.Object

org.eclipse.persistence.jpa.jpql.Resolver

org.eclipse.persistence.jpa.jpql.SubqueryEntityResolver

public class SubqueryEntityResolver
extends Resolver

This Resolver retrieves the type for an abstract schema name (entity name) if it can be resolved otherwise a derived path will be assumed. This Resolver is used within a subquery and it handles the following two cases.

The "root" object in the subquery is an unqualified derived path:

 UPDATE Employee SET name = 'JPQL'
 WHERE (SELECT a FROM addr a)

and The "root" object in the subquery is an entity:

 UPDATE Employee SET name = 'JPQL'
 WHERE (SELECT a FROM Address a)

Since:

2.5

Version:

2.5

Author:

Pascal Filion

Constructor Summary

Constructors

Constructor and Description
SubqueryEntityResolver(Resolver parent, JPQLQueryContext queryContext, AbstractSchemaName abstractSchemaName) Creates a new DerivedPathResolver.

Method Summary

Modifier and Type	Method and Description
void	accept(ResolverVisitor visitor) Visits this Resolver by the given visitor.
java.lang.String	getAbstractSchemaName() Returns the name of the entity to resolve.
IManagedType	getManagedType() Returns the IManagedType associated with the field handled by this Resolver.
IMapping	getMapping() Returns the IMapping for the wrapped field.
java.lang.String	toString()

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

getParent, getType, isNullAllowed, setNullAllowed

Methods inherited from class java.lang.Object

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

Constructor Detail

SubqueryEntityResolver

public SubqueryEntityResolver(Resolver parent,
                              JPQLQueryContext queryContext,
                              AbstractSchemaName abstractSchemaName)

Creates a new DerivedPathResolver.

Parameters:

parent - The parent Resolver, which is never null

queryContext - The JPQLQueryContext for the subquery

The - AbstractSchemaName holding onto the the name of the entity

Method Detail

accept

public void accept(ResolverVisitor visitor)

Visits this Resolver by the given visitor.

Specified by:

accept in class Resolver

Parameters:

visitor - The visitor to visit this object

getAbstractSchemaName

public java.lang.String getAbstractSchemaName()

Returns the name of the entity to resolve.

Returns:

The entity name, which is never null

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

getMapping

public IMapping getMapping()

Returns the IMapping for the wrapped field.

Overrides:

getMapping in class Resolver

Returns:

Either the IMapping or null if none exists

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object