/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2009 by Red Hat Inc and/or its affiliates or by
 * third-party contributors as indicated by either @author tags or express
 * copyright attribution statements applied by the authors.  All
 * third-party contributions are distributed under license by Red Hat Inc.
 *
 * This copyrighted material is made available to anyone wishing to use, modify,
 * copy, or redistribute it subject to the terms and conditions of the GNU
 * Lesser General Public License, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this distribution; if not, write to:
 * Free Software Foundation, Inc.
 * 51 Franklin Street, Fifth Floor
 * Boston, MA  02110-1301  USA
 */
package org.hibernate.ejb.criteria.expression;
import java.io.Serializable;
import java.util.Collections;
import java.util.List;
import javax.persistence.criteria.Selection;
import org.hibernate.ejb.criteria.CriteriaBuilderImpl;
import org.hibernate.ejb.criteria.ParameterContainer;
import org.hibernate.ejb.criteria.SelectionImplementor;
import org.hibernate.ejb.criteria.ValueHandlerFactory;

/**
 * The Hibernate implementation of the JPA {@link Selection}
 * contract.
 *
 * @author Steve Ebersole
 */
public abstract class SelectionImpl<X>
		extends AbstractTupleElement<X>
		implements SelectionImplementor<X>, ParameterContainer, Serializable {
	public SelectionImpl(CriteriaBuilderImpl criteriaBuilder, Class<X> javaType) {
		super( criteriaBuilder, javaType );
	}

	public Selection<X> alias(String alias) {
		setAlias( alias );
		return this;
	}

	public boolean isCompoundSelection() {
		return false;
	}

	public List<ValueHandlerFactory.ValueHandler> getValueHandlers() {
		return getValueHandler() == null
				? null
				: Collections.singletonList( (ValueHandlerFactory.ValueHandler) getValueHandler() );
	}

	public List<Selection<?>> getCompoundSelectionItems() {
		throw new IllegalStateException( "Not a compound selection" );
	}
}