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/* gnu.java.beans.decoder.AbstractObjectContext

   Copyright (C) 2004 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. */

package gnu.java.beans.decoder;

import java.lang.reflect.InvocationTargetException;

import java.lang.reflect.Method;

/** AbstractObjectContext is the base for all Context implementations which

 * create or provide a result object during their lifetime.

 *

 * <p>This class provides the implementation for an indexed get and set method.

 * But this does not mean that the result object supports these operation.</p>

 *

 * @author Robert Schuster

 *

 */

abstract class AbstractObjectContext extends AbstractContext

{

    protected Object object;

    AbstractObjectContext()

    {}

    /** Sets the result object of the Context.

     *

     * @param obj The result object to be set.

     */

    protected final void setObject(Object obj)

    {

        object = obj;

    }

    /* (non-Javadoc)

     * @see gnu.java.beans.decoder.Context#set(int, java.lang.Object)

     */

    public final void set(int index, Object o) throws AssemblyException

    {

        try

        {

            Method method =

                object.getClass().getMethod(

                    "set",

                    new Class[] { Integer.TYPE, Object.class });

            method.invoke(object, new Object[] { new Integer(index), o });

        }

        catch (NoSuchMethodException nsme)

        {

            throw new AssemblyException(nsme);

        }

        catch (InvocationTargetException ite)

        {

            throw new AssemblyException(ite.getCause());

        }

        catch (IllegalAccessException iae)

        {

            throw new AssemblyException(iae);

        }

    }

    /* (non-Javadoc)

     * @see gnu.java.beans.decoder.Context#get(int)

     */

    public final Object get(int index) throws AssemblyException

    {

        try

        {

            Method method =

                object.getClass().getMethod(

                    "get",

                    new Class[] { Integer.TYPE });

            return method.invoke(object, new Object[] { new Integer(index)});

        }

        catch (NoSuchMethodException nsme)

        {

            throw new AssemblyException(nsme);

        }

        catch (InvocationTargetException ite)

        {

            throw new AssemblyException(ite.getCause());

        }

        catch (IllegalAccessException iae)

        {

            throw new AssemblyException(iae);

        }

    }

    public final Object getResult()

    {

        return object;

    }

}