Checks.java

/*
 * Vitry, copyright (C) Hans Hoglund 2011
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * at your option) any later version.
 * 
 * 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 General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * See COPYING.txt for details.
 */
package vitry.runtime.util;

import vitry.runtime.Arity;


/**
 * Static methods to check function arguments.
 * 
 * All throw IllegalArgumentException upon failure.
 */
public class Checks
{
    private Checks() {
    }

    public static void checkArity(Arity a, int arity)
    {
        if (a.getArity() != arity)
            throw new IllegalArgumentException("Function must have arity " + arity);
    }

    public static void checkNotNull(Object... args)
    {
        for (Object o : args)
        {
            if (o == null)
                throw new IllegalArgumentException("Excepted non-null argument");
        }
    }
}