001 /* IIOParamController.java -- 002 Copyright (C) 2004 Free Software Foundation, Inc. 003 004 This file is part of GNU Classpath. 005 006 GNU Classpath is free software; you can redistribute it and/or modify 007 it under the terms of the GNU General Public License as published by 008 the Free Software Foundation; either version 2, or (at your option) 009 any later version. 010 011 GNU Classpath is distributed in the hope that it will be useful, but 012 WITHOUT ANY WARRANTY; without even the implied warranty of 013 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014 General Public License for more details. 015 016 You should have received a copy of the GNU General Public License 017 along with GNU Classpath; see the file COPYING. If not, write to the 018 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 019 02110-1301 USA. 020 021 Linking this library statically or dynamically with other modules is 022 making a combined work based on this library. Thus, the terms and 023 conditions of the GNU General Public License cover the whole 024 combination. 025 026 As a special exception, the copyright holders of this library give you 027 permission to link this library with independent modules to produce an 028 executable, regardless of the license terms of these independent 029 modules, and to copy and distribute the resulting executable under 030 terms of your choice, provided that you also meet, for each linked 031 independent module, the terms and conditions of the license of that 032 module. An independent module is a module which is not derived from 033 or based on this library. If you modify this library, you may extend 034 this exception to your version of the library, but you are not 035 obligated to do so. If you do not wish to do so, delete this 036 exception statement from your version. */ 037 038 039 package javax.imageio; 040 041 /** 042 * An interface to set image parameters. An IIOParamController may be 043 * a GUI component, a database reader, command-line parser or any 044 * other means of getting parameter settings. For exampe, a dialog 045 * box could implement IIOParamController to allow a user to adjust 046 * JPEG compression levels. 047 * 048 * The activate method should always behave modally; it should only 049 * return when the action has been either cancelled or completed. 050 * 051 * @author Michael Koch (konqueror@gmx.de) 052 */ 053 public interface IIOParamController 054 { 055 /** 056 * Activates the controller. A return value of false should mean 057 * that no changes were made to param. A return value of true 058 * should mean that the image is ready to be read or written. 059 * 060 * @param param the <code>IIOParam</code> to be modified 061 * 062 * @return true if the <code>IIOParam</code> has been modified, 063 * false otherwise 064 * 065 * @exception IllegalArgumentException if param is null or is not an instance 066 * of the correct class 067 */ 068 boolean activate(IIOParam param); 069 }