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/*******************************************************************************
 * Copyright (c) 2011, 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.tools.resolver;

import org.eclipse.persistence.jpa.jpql.tools.spi.IManagedType;
import org.eclipse.persistence.jpa.jpql.tools.spi.ITypeDeclaration;

/**
 * This {@link Resolver} resolves a path and casts it as another entity type.
 *
 * @version 2.5
 * @since 2.3
 * @author Pascal Filion
 */
@SuppressWarnings("nls")
public class TreatResolver extends Resolver {

	/**
	 * The entity type name used to downcast the collection-valued field.
	 */
	private String entityTypeName;

	/**
	 * Creates a new TreatResolver.
	 *
	 * @param parent The parent of this resolver, which is never null
	 * @param entityTypeName The entity type name used to downcast the collection-valued field
	 */
	public TreatResolver(Resolver parent, String entityTypeName) {
		super(parent);
		this.entityTypeName = entityTypeName;
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	protected ITypeDeclaration buildTypeDeclaration() {
		IManagedType managedType = getManagedType();
		if (managedType != null) {
			return managedType.getType().getTypeDeclaration();
		}
		return getTypeHelper().unknownTypeDeclaration();
	}

	/**
	 * Returns the entity type name used to downcast the path expression.
	 *
	 * @return The entity type name used to downcast the path expression
	 */
	public String getEntityTypeName() {
		return entityTypeName;
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public IManagedType getManagedType() {
		return getProvider().getEntityNamed(entityTypeName);
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public void setNullAllowed(boolean nullAllowed) {
		super.setNullAllowed(nullAllowed);
		getParent().setNullAllowed(nullAllowed);
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public String toString() {
		return "TREAT(" + getParent() + ") AS " + entityTypeName;
	}
}