Method: {...}

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: }