/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2009-2011, Red Hat Inc. or third-party contributors as
 * indicated by the @author tags or express copyright attribution
 * statements applied by the authors.  All third-party contributions are
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 *
 * 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
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package org.hibernate.hql.internal.ast.tree;

import java.util.List;

import org.hibernate.transform.ResultTransformer;

Contract for a select expression which aggregates other select expressions together into a single return
Author:
Steve Ebersole/**
 * Contract for a select expression which aggregates other select expressions together into a single return
 *
 * @author Steve Ebersole
 */
public interface AggregatedSelectExpression extends SelectExpression {
	
Retrieves a list of the selection types being aggregated 
Returns:
The list of types./**
	 * Retrieves a list of the selection {@link org.hibernate.type.Type types} being aggregated
	 *
	 * @return The list of types.
	 */
	public List getAggregatedSelectionTypeList();

	
Retrieve the aliases for the columns aggregated here.
Returns:
The column aliases./**
	 * Retrieve the aliases for the columns aggregated here.
	 *
	 * @return The column aliases.
	 */
	public String[] getAggregatedAliases();

	
Retrieve the ResultTransformer responsible for building aggregated select expression results into their aggregated form. 
Returns:
The appropriate transformer/**
	 * Retrieve the {@link ResultTransformer} responsible for building aggregated select expression results into their
	 * aggregated form.
	 *
	 * @return The appropriate transformer
	 */
	public ResultTransformer getResultTransformer();

	
Obtain the java type of the aggregation
Returns:
The java type./**
	 * Obtain the java type of the aggregation
	 *
	 * @return The java type.
	 */
	public Class getAggregationResultType();
}