source: trunk/gcc/libjava/java/awt/BufferCapabilities.java

/* BufferCapabilities.java -- 
   Copyright (C) 2002 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.

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along with GNU Classpath; see the file COPYING.  If not, write to the
Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA.

Linking this library statically or dynamically with other modules is
making a combined work based on this library.  Thus, the terms and
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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
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package java.awt;

/**
 * Needs documentation...
 *
 * @author Eric Blake <ebb9@email.byu.edu>
 * @see BufferStrategy#getCapabilities()
 * @see GraphicsConfiguration#getCapabilities()
 * @since 1.4
 * @status updated to 1.4, lacks documentation
 */
public class BufferCapabilities implements Cloneable
{
  public static final class FlipContents extends AttributeValue
  {
    private static final String[] NAMES
      = { "undefined", "background", "prior", "copied" };
    public static final FlipContents UNDEFINED = new FlipContents(0);
    public static final FlipContents BACKGROUND = new FlipContents(1);
    public static final FlipContents PRIOR = new FlipContents(2);
    public static final FlipContents COPIED = new FlipContents(3);
    private FlipContents(int value)
    {
      super(value, NAMES);
    }
  } // class FlipContents

  private final ImageCapabilities front;
  private final ImageCapabilities back;
  private final FlipContents flip;

  /**
   * Creates a buffer capabilities object.
   *
   * @exception IllegalArgumentException If frontCaps or backCaps are null.
   */
  public BufferCapabilities(ImageCapabilities front, ImageCapabilities back,
                            FlipContents flip)
  {
    this.front = front;
    this.back = back;
    this.flip = flip;
    if (front ==  null || back == null)
      throw new IllegalArgumentException();
  }

  public ImageCapabilities getFrontBufferCapabilities()
  {
    return front;
  }

  public ImageCapabilities getBackBufferCapabilities()
  {
    return back;
  }

  public boolean isPageFlipping()
  {
    return flip != null;
  }

  public FlipContents getFlipContents()
  {
    return flip;
  }

  public boolean isFullScreenRequired()
  {
    return true;
  }

  public boolean isMultiBufferAvailable()
  {
    return false;
  }

  public Object clone()
  {
    try
      {
        return super.clone();
      }
    catch (CloneNotSupportedException e)
      {
        throw (Error) new InternalError().initCause(e); // Impossible
      }
  }
} // class BufferCapabilities