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/* VMVio.java -- Native operations, required by value IO.

 Copyright (C) 2005 Free Software Foundation, Inc.

 This file is part of GNU Classpath.

 GNU Classpath 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 2, or (at your option)

 any later version.

 GNU Classpath 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 GNU Classpath; see the file COPYING.  If not, write to the

 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

 02110-1301 USA.

 Linking this library statically or dynamically with other modules is

 making a combined work based on this library.  Thus, the terms and

 conditions of the GNU General Public License cover the whole

 combination.

 As a special exception, the copyright holders of this library give you

 permission to link this library with independent modules to produce an

 executable, regardless of the license terms of these independent

 modules, and to copy and distribute the resulting executable under

 terms of your choice, provided that you also meet, for each linked

 independent module, the terms and conditions of the license of that

 module.  An independent module is a module which is not derived from

 or based on this library.  If you modify this library, you may extend

 this exception to your version of the library, but you are not

 obligated to do so.  If you do not wish to do so, delete this

 exception statement from your version. */

/**

 * This is a temporary replacement for the native call that would allocate

 * objects without public constructors. The replacement only allocates

 * objects with public parameterless constructor and objects with public

 * constructor taking string (like some Throwables).

 *

 * @author Audrius Meskauskas (AudriusA@Bioinformatics.org)

 *

 * TODO FIXME replace by native call like in VMObjectInputStream.

 * Required modification of Classpath the build system.

 */

package gnu.CORBA.CDR;

import java.lang.reflect.Constructor;

public class VMVio

{

  /**

   * Allocates a new Object of type clazz but without running the default

   * constructor on it. It then calls the given constructor on it. The given

   * constructor method comes from the constr_clazz which is a super class of

   * the given clazz.

   */

  public static Object allocateObject(Class clazz, Class constr_clazz,

    Constructor constructor)

    throws InstantiationException

  {

    try

      {

        Constructor c = clazz.getConstructor(new Class[0]);

        c.setAccessible(true);

        return c.newInstance(new Object[0]);

      }

    catch (Exception ex)

      {

        try

          {

            Constructor c = clazz.getConstructor(new Class[] { String.class });

            return c.newInstance(new Object[] { "" });

          }

        catch (Exception ex2)

          {

            Constructor c[] = clazz.getConstructors();

            for (int i = 0; i < c.length; i++)

              {

                try

                  {

                    c[i].setAccessible(true);

                    Class[] args = c[i].getParameterTypes();

                    return c[i].newInstance(new Object[args.length]);

                  }

                catch (Exception ex3)

                  {

                    // Try another one.

                  }

              }

          }

        throw new InstantiationException(clazz.getName());

      }

  }

}