/*
 * Copyright (c) 2003 Sun Microsystems, Inc. All Rights Reserved.
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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 * 
 * This software is provided "AS IS," without a warranty of any kind. ALL
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 * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
 * PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
 * MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
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 */

package javax.media.nwi;

/** Provides a mechanism by which applications can customize the
    window type selection for a given {@link NWCapabilities}.
    Developers can implement this interface and pass an instance into
    the appropriate method of {@link GLDrawableFactory}; the chooser
    will be called during the OpenGL context creation process. */

public interface NWCapabilitiesChooser {
  /** Chooses the index (0..available.length - 1) of the {@link
      NWCapabilities} most closely matching the desired one from the
      list of all supported. Some of the entries in the
      <code>available</code> array may be null; the chooser must
      ignore these. The <em>windowSystemRecommendedChoice</em>
      parameter may be provided to the chooser by the underlying
      window system; if this index is valid, it is recommended, but
      not necessarily required, that the chooser select that entry.

      <P> <em>Note:</em> this method is called automatically by the
      {@link GLDrawableFactory} when an instance of this class is
      passed in to one of its factory methods. It should generally not
      be invoked by users directly, unless it is desired to delegate
      the choice to some other NWCapabilitiesChooser object.
  */
  public int chooseCapabilities(NWCapabilities desired,
                                NWCapabilities[] available,
                                int windowSystemRecommendedChoice);
}