/*

 * $Id$

 *

 * Copyright (C) 2003-2009 JNode.org

 *

 * This library is free software; you can redistribute it and/or modify it

 * under the terms of the GNU Lesser General Public License as published

 * by the Free Software Foundation; either version 2.1 of the License, or

 * (at your option) any later version.

 *

 * This library 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 library; If not, write to the Free Software Foundation, Inc., 

 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

 */

package org.jnode.vm;

import gnu.java.lang.VMClassHelper;

/**

 * Utility class to share some Vm features.

 * For now, it's especially used to know how native methods are implemented in JNode.

 *

 * @author Fabien DUMINY (fduminy at jnode.org)

 */

public class VmUtils {

    private static final String NATIVE_CLASSNAME_PREFIX = "Native";

    public static boolean couldImplementNativeMethods(String className) {

        String clsName = VMClassHelper.getClassNamePortion(className);

        return clsName.startsWith(NATIVE_CLASSNAME_PREFIX);

    }

    public static String getNativeClassName(String className) {

        final String pkg = VMClassHelper.getPackagePortion(className);

        final String nativeClassName = pkg + ((pkg.length() > 0) ? "." : "")

            + NATIVE_CLASSNAME_PREFIX + VMClassHelper.getClassNamePortion(className);

        return nativeClassName;

    }

    public static boolean allowNatives(String className, String architectureName) {

        boolean allowNatives = false;

        allowNatives |= className.equals("org.jnode.vm.Unsafe");

        /*

        allowNatives |= className.equals("org.jnode.vm." + architectureName + ".Unsafe"

                + architectureName.toUpperCase());

          */

        allowNatives |= className.indexOf("org.jnode.vm.") > -1 && className.indexOf(".Unsafe") > -1;

        return allowNatives;

    }

}