/*
 * Copyright (c) 2012, 2012, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
package com.oracle.truffle.sl;

import java.math.*;

import com.oracle.truffle.api.codegen.*;

@TypeSystem({int.class, BigInteger.class, boolean.class, String.class})
public class SLTypes {

    @TypeCheck
    public boolean isInteger(Object value) {
        return value instanceof Integer || (value instanceof BigInteger && ((BigInteger) value).bitLength() < Integer.SIZE);
    }

    @TypeCast
    public int asInteger(Object value) {
        assert isInteger(value);
        if (value instanceof Integer) {
            return (int) value;
        } else {
            int result = ((BigInteger) value).intValue();
            assert BigInteger.valueOf(result).equals(value) : "Loosing precision";
            return result;
        }
    }

    @TypeCheck
    public boolean isBigInteger(Object value) {
        return value instanceof Integer || value instanceof BigInteger;
    }

    @TypeCast
    public BigInteger asBigInteger(Object value) {
        if (value instanceof Integer) {
            return BigInteger.valueOf((int) value);
        } else {
            return (BigInteger) value;
        }
    }

    @TypeCast
    public BigInteger asBigInteger(int value) {
        return BigInteger.valueOf(value);
    }

    @TypeCheck
    public boolean isBigInteger(@SuppressWarnings("unused")
    int value) {
        return true;
    }
}