/*
* @(#)CheckboxGroup.java 1.11 95/11/14 Sami Shaio
*
* Copyright (c) 1994-1995 Sun Microsystems, Inc. All Rights Reserved.
*
* Permission to use, copy, modify, and distribute this software
* and its documentation for NON-COMMERCIAL purposes and without
* fee is hereby granted provided that this copyright notice
* appears in all copies. Please refer to the file "copyright.html"
* for further important copyright and licensing information.
*
* SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF
* THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
* TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR
* ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
* DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES.
*/
package java.awt;
/**
* This class is used to create a multiple-exclusion scope for a set
* of Checkbox buttons. For example, creating a set of Checkbox buttons
* with the same CheckboxGroup object means that only one of those Checkbox
* buttons will be allowed to be "on" at a time.
*
* @version 1.11 14 Nov 1995
* @author Sami Shaio
*/
public class CheckboxGroup {
/**
* The current choice.
*/
Checkbox currentChoice = null;
/**
* Creates a new CheckboxGroup.
*/
public CheckboxGroup() {
}
/**
* Gets the current choice.
*/
public Checkbox getCurrent() {
return currentChoice;
}
/**
* Sets the current choice to the specified Checkbox.
* If the Checkbox belongs to a different group, just return.
* @param box the current Checkbox choice
*/
public synchronized void setCurrent(Checkbox box) {
if (box != null && box.group != this) {
return;
}
Checkbox oldChoice = this.currentChoice;
this.currentChoice = box;
if ((oldChoice != null) && (oldChoice != box)) {
oldChoice.setState(false);
}
if (box != null && oldChoice != box && !box.getState()) {
box.setStateInternal(true);
}
}
/**
* Returns the String representation of this CheckboxGroup's values.
* Convert to String.
*/
public String toString() {
return getClass().getName() + "[current=" + currentChoice + "]";
}
}