minwin-gcc-5-2/libjava/classpath/javax/imageio/IIOParamController.java

/* IIOParamController.java --
   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
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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
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permission to link this library with independent modules to produce an
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package javax.imageio;

/**
 * An interface to set image parameters.  An IIOParamController may be
 * a GUI component, a database reader, command-line parser or any
 * other means of getting parameter settings.  For exampe, a dialog
 * box could implement IIOParamController to allow a user to adjust
 * JPEG compression levels.
 *
 * The activate method should always behave modally; it should only
 * return when the action has been either cancelled or completed.
 *
 * @author Michael Koch (konqueror@gmx.de)
 */
public interface IIOParamController
{
  /**
   * Activates the controller.  A return value of false should mean
   * that no changes were made to param.  A return value of true
   * should mean that the image is ready to be read or written.
   *
   * @param param the <code>IIOParam</code> to be modified
   *
   * @return true if the <code>IIOParam</code> has been modified,
   * false otherwise
   *
   * @exception IllegalArgumentException if param is null or is not an instance
   * of the correct class
   */
  boolean activate(IIOParam param);
}