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1: /* GtkCheckboxGroupPeer.java - Wrap a CheckboxGroup 2: Copyright (C) 2002 Free Software Foundation, Inc. 3: 4: This file is part of GNU Classpath. 5: 6: GNU Classpath is free software; you can redistribute it and/or modify 7: it under the terms of the GNU General Public License as published by 8: the Free Software Foundation; either version 2, or (at your option) 9: any later version. 10: 11: GNU Classpath is distributed in the hope that it will be useful, but 12: WITHOUT ANY WARRANTY; without even the implied warranty of 13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14: General Public License for more details. 15: 16: You should have received a copy of the GNU General Public License 17: along with GNU Classpath; see the file COPYING. If not, write to the 18: Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 19: 02110-1301 USA. 20: 21: Linking this library statically or dynamically with other modules is 22: making a combined work based on this library. Thus, the terms and 23: conditions of the GNU General Public License cover the whole 24: combination. 25: 26: As a special exception, the copyright holders of this library give you 27: permission to link this library with independent modules to produce an 28: executable, regardless of the license terms of these independent 29: modules, and to copy and distribute the resulting executable under 30: terms of your choice, provided that you also meet, for each linked 31: independent module, the terms and conditions of the license of that 32: module. An independent module is a module which is not derived from 33: or based on this library. If you modify this library, you may extend 34: this exception to your version of the library, but you are not 35: obligated to do so. If you do not wish to do so, delete this 36: exception statement from your version. */ 37: 38: 39: package gnu.java.awt.peer.gtk; 40: 41: import java.awt.CheckboxGroup; 42: import java.util.WeakHashMap; 43: 44: // Note that there is no peer interface for a CheckboxGroup. We 45: // introduce our own in order to make it easier to keep a piece of 46: // native state for each one. 47: public class GtkCheckboxGroupPeer extends GtkGenericPeer 48: { 49: // This maps from a CheckboxGroup to the native peer. 50: private static WeakHashMap map = new WeakHashMap (); 51: 52: // Find the native peer corresponding to a CheckboxGroup. 53: public static synchronized GtkCheckboxGroupPeer 54: getCheckboxGroupPeer (CheckboxGroup group) 55: { 56: if (group == null) 57: return null; 58: GtkCheckboxGroupPeer nat = (GtkCheckboxGroupPeer) map.get (group); 59: if (nat == null) 60: { 61: nat = new GtkCheckboxGroupPeer (); 62: map.put (group, nat); 63: } 64: return nat; 65: } 66: 67: private GtkCheckboxGroupPeer () 68: { 69: // We don't need any special state here. Note that we can't store 70: // a reference to the java-side CheckboxGroup. That would mean 71: // they could never be collected. 72: super (null); 73: } 74: 75: // Dispose of our native resources. 76: public native void dispose (); 77: 78: // Remove a given checkbox from this group. 79: public native void remove (GtkCheckboxPeer box); 80: 81: // When collected, clean up the native state. 82: protected void finalize () 83: { 84: dispose (); 85: } 86: }