1 /*
2 * *************************************************************************************************************************************************************
3 *
4 * TheseFoolishThings: Miscellaneous utilities
5 * http://tidalwave.it/projects/thesefoolishthings
6 *
7 * Copyright (C) 2009 - 2024 by Tidalwave s.a.s. (http://tidalwave.it)
8 *
9 * *************************************************************************************************************************************************************
10 *
11 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License.
12 * You may obtain a copy of the License at
13 *
14 * http://www.apache.org/licenses/LICENSE-2.0
15 *
16 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
17 * CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
18 *
19 * *************************************************************************************************************************************************************
20 *
21 * git clone https://bitbucket.org/tidalwave/thesefoolishthings-src
22 * git clone https://github.com/tidalwave-it/thesefoolishthings-src
23 *
24 * *************************************************************************************************************************************************************
25 */
26 package it.tidalwave.role.ui.function;
27
28 import javax.annotation.Nonnull;
29 import java.beans.PropertyChangeEvent;
30 import java.beans.PropertyChangeListener;
31 import it.tidalwave.role.ui.ChangingSource;
32
33 /***************************************************************************************************************************************************************
34 *
35 * @author Fabrizio Giudici
36 *
37 **************************************************************************************************************************************************************/
38 public abstract class BooleanBoundFunctionSupport extends BoundFunctionSupport<Boolean, Boolean>
39 {
40 protected final ChangingSource<Boolean>[] sources;
41
42 private boolean oldValue;
43
44 private boolean newValue;
45
46 private final PropertyChangeListener pcl = new PropertyChangeListener()
47 {
48 @Override
49 public void propertyChange (@Nonnull final PropertyChangeEvent event)
50 {
51 newValue = function();
52 fireValueChanged(oldValue, newValue);
53 oldValue = newValue;
54 }
55 };
56
57 public BooleanBoundFunctionSupport (@Nonnull final ChangingSource<Boolean> ... sources)
58 {
59 this.sources = sources;
60
61 for (final var source : sources)
62 {
63 source.addPropertyChangeListener(pcl);
64 }
65
66 oldValue = function();
67 }
68
69 protected abstract boolean function();
70
71 @Override @Nonnull
72 public final Boolean get()
73 {
74 return newValue;
75 }
76 }