/*******************************************************************************
* Copyright (c) 2006, 2011 Oracle. 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.internal.jpql;
import org.eclipse.persistence.jpa.jpql.spi.IManagedType;
import org.eclipse.persistence.jpa.jpql.spi.IType;
import org.eclipse.persistence.jpa.jpql.spi.ITypeDeclaration;
/**
* This {@link Resolver} is responsible to return the map key, which means that for identification
* variables referring to an instance of an association or collection represented as a {@link
* java.util.Map Map}, the identification variable is of the abstract schema type of the map key.
*
* @see ValueResolver
*
* @version 2.3
* @since 2.3
* @author Pascal Filion
*/
@SuppressWarnings("nls")
public final class KeyResolver extends Resolver {
/**
* Creates a new <code>KeyResolver</code>.
*
* @param parent The parent {@link Resolver}, which is never <code>null</code>
*/
KeyResolver(Resolver parent) {
super(parent);
}
/**
* {@inheritDoc}
*/
@Override
public void accept(ResolverVisitor visitor) {
visitor.visit(this);
}
/**
* {@inheritDoc}
*/
@Override
IType buildType() {
ITypeDeclaration typeDeclaration = getTypeDeclaration();
if (getTypeHelper().isMapType(typeDeclaration.getType())) {
ITypeDeclaration[] typeParameters = typeDeclaration.getTypeParameters();
if (typeParameters.length > 0) {
return typeParameters[0].getType();
}
}
return getTypeHelper().objectType();
}
/**
* {@inheritDoc}
*/
@Override
ITypeDeclaration buildTypeDeclaration() {
return getParentTypeDeclaration();
}
/**
* {@inheritDoc}
*/
@Override
public IManagedType getManagedType() {
return getProvider().getManagedType(getType());
}
/**
* {@inheritDoc}
*/
@Override
public String toString() {
return "VALUE(" + getParent() + "";
}
}