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/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2008, Red Hat Middleware LLC or third-party contributors as
 * indicated by the @author tags or express copyright attribution
 * statements applied by the authors.  All third-party contributions are
 * distributed under license by Red Hat Middleware LLC.
 *
 * 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.hql.ast.tree;

import java.lang.reflect.Constructor;
import java.util.Arrays;
import java.util.List;

import org.hibernate.PropertyNotFoundException;
import org.hibernate.QueryException;
import org.hibernate.transform.ResultTransformer;
import org.hibernate.transform.AliasToBeanConstructorResultTransformer;
import org.hibernate.transform.Transformers;
import org.hibernate.hql.ast.DetailedSemanticException;
import org.hibernate.type.Type;
import org.hibernate.util.ReflectHelper;
import org.hibernate.util.StringHelper;

import antlr.SemanticException;
import antlr.collections.AST;

/**
 * Represents a constructor (new) in a SELECT.
 *
 * @author josh
 */
public class ConstructorNode extends SelectExpressionList implements AggregatedSelectExpression {
	private Constructor constructor;
	private Type[] constructorArgumentTypes;
	private boolean isMap;
	private boolean isList;

	public ResultTransformer getResultTransformer() {
		if ( constructor != null ) {
			return new AliasToBeanConstructorResultTransformer( constructor );
		}
		else if ( isMap ) {
			return Transformers.ALIAS_TO_ENTITY_MAP;
		}
		else if ( isList ) {
			return Transformers.TO_LIST;
		}
		throw new QueryException( "Unable to determine proper dynamic-instantiation tranformer to use." );
	}

	public boolean isMap() {
		return isMap;
	}
	
	public boolean isList() {
		return isList;
	}

	private String[] aggregatedAliases;

	public String[] getAggregatedAliases() {
		if ( aggregatedAliases == null ) {
			aggregatedAliases = buildAggregatedAliases();
		}
		return aggregatedAliases;
	}

	private String[] buildAggregatedAliases() {
		SelectExpression[] selectExpressions = collectSelectExpressions();
		String[] aliases = new String[selectExpressions.length] ;
		for ( int i=0; i