/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 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
* 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.predicate;
import java.math.BigDecimal;
import java.math.BigInteger;
import org.hibernate.ejb.criteria.expression.BinaryArithmeticOperation.Operation;
/**
* @author Steve Ebersole
*/
public class ImplicitNumericExpressionTypeDeterminer {
/**
* Determine the appropriate runtime result type for a numeric expression according to
* section "6.5.7.1 Result Types of Expressions" of the JPA spec.
* <p/>
* Note that it is expected that the caveats about quotient handling have already been handled.
*
* @param types The argument/expression types
*
* @return The appropriate numeric result type.
*/
public static Class<? extends Number> determineResultType(Class<? extends Number>... types) {
Class<? extends Number> result = Number.class;
for ( Class<? extends Number> type : types ) {
if ( Double.class.equals( type ) ) {
result = Double.class;
}
else if ( Float.class.equals( type ) ) {
result = Float.class;
}
else if ( BigDecimal.class.equals( type ) ) {
result = BigDecimal.class;
}
else if ( BigInteger.class.equals( type ) ) {
result = BigInteger.class;
}
else if ( Long.class.equals( type ) ) {
result = Long.class;
}
else if ( isIntegralType( type ) ) {
result = Integer.class;
}
}
return result;
}
private static boolean isIntegralType(Class<? extends Number> type) {
return Integer.class.equals( type ) ||
Short.class.equals( type );
}
}