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/* gnu.java.beans.decoder.IndexContext

   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;

/** IndexContext is Context implementation that senses whether it is an indexed get or set

 * operation and invokes this operation.

 *

 * <p>An IndexContent is a get operation when no argument is provided and a set operation if one

 * argument is provided.</p>

 *

 * @author Robert Schuster

 */

class IndexContext extends AbstractContext

{

  private Object result;

  private Object argument;

  private int index;

  private boolean isSetter;

  IndexContext(String id, int newIndex)

  {

    setId(id);

    index = newIndex;

  }

  /* (non-Javadoc)

   * @see gnu.java.beans.decoder.Context#addObject(java.lang.Object)

   */

  public void addParameterObject(Object o) throws AssemblyException

  {

    if (! isSetter)

      {

        argument = o;

        isSetter = true;

      }

    else

      throw new AssemblyException(new IllegalStateException("More than one argument for indiced access is not possible."));

  }

  /* (non-Javadoc)

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

   */

  public void notifyStatement(Context outerContext) throws AssemblyException

  {

    throw new AssemblyException(new IllegalStateException("Statements inside indiced access are not allowed."));

  }

  /* (non-Javadoc)

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

   */

  public Object endContext(Context outerContext) throws AssemblyException

  {

    if (isSetter)

      {

        // setter

        outerContext.set(index, argument);

        return null;

      }

    else

      // getter

      return result = outerContext.get(index);

  }

  /* (non-Javadoc)

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

   */

  public boolean subContextFailed()

  {

    // returns true to indicate that indiced access assembly fails when one of its

    // argument could not be assembled

    return true;

  }

  /* (non-Javadoc)

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

   */

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

  {

    throw new AssemblyException(new IllegalStateException("Setter is not allowed inside indiced access."));

  }

  /* (non-Javadoc)

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

   */

  public Object get(int index) throws AssemblyException

  {

    throw new AssemblyException(new IllegalStateException("getter is not allowed insided indiced access."));

  }

  public Object getResult()

  {

    return result;

  }

}