/*******************************************************************************
* Copyright (c) 2006, 2013 Oracle and/or its affiliates. All rights reserved.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0
* which accompanies this distribution.
* The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
* and the Eclipse Distribution License is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* Contributors:
* Oracle - initial API and implementation
*
******************************************************************************/
package org.eclipse.persistence.jpa.jpql;
import org.eclipse.persistence.jpa.jpql.spi.IManagedType;
import org.eclipse.persistence.jpa.jpql.spi.IMapping;
import org.eclipse.persistence.jpa.jpql.spi.IType;
import org.eclipse.persistence.jpa.jpql.spi.ITypeDeclaration;
/**
* This {@link Resolver} is responsible to resolve the type of a state field, which is the leaf of
* the state field path expression.
* <p>
* It is possible the state field path expression is actually an enum type, which will be
*
* @version 2.4
* @since 2.3
* @author Pascal Filion
*/
public class StateFieldResolver extends AbstractPathResolver {
/**
* Creates a new <code>StateFieldResolver</code>.
*
* @param parent The parent {@link Resolver}, which is never <code>null</code>
*/
public StateFieldResolver(Resolver parent, String path) {
super(parent, path);
}
/**
* {@inheritDoc}
*/
@Override
public void accept(ResolverVisitor visitor) {
visitor.visit(this);
}
/**
* {@inheritDoc}
*/
@Override
protected IType buildType() {
return getTypeHelper().convertPrimitive(super.buildType());
}
/**
* {@inheritDoc}
*/
@Override
protected IManagedType resolveManagedType(IMapping mapping) {
ITypeDeclaration typeDeclaration = mapping.getTypeDeclaration();
IType type = typeDeclaration.getType();
// Collection type cannot be traversed
// Example: SELECT e.employees. FROM Employee e where employees is a collection,
// it cannot be traversed
if (getTypeHelper().isCollectionType(type)) {
return null;
}
// Primitive types cannot have a managed type
if (getTypeHelper().isPrimitiveType(type)) {
return null;
}
// Retrieve the corresponding managed type for the mapping's type
return getProvider().getManagedType(type);
}
}