Method: NonEmptyFunction(ChangingSource)

1: /*
2: * *************************************************************************************************************************************************************
3: *
4: * SteelBlue: DCI User Interfaces
5: * http://tidalwave.it/projects/steelblue
6: *
7: * Copyright (C) 2015 - 2025 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/steelblue-src
22: * git clone https://github.com/tidalwave-it/steelblue-src
23: *
24: * *************************************************************************************************************************************************************
25: */
26: package it.tidalwave.ui.core.function;
27:
28: import jakarta.annotation.Nonnull;
29: import it.tidalwave.ui.core.ChangingSource;
30:
31: /***************************************************************************************************************************************************************
32: *
33: * @since 2.0-ALPHA-1
34: * @author Fabrizio Giudici
35: *
36: **************************************************************************************************************************************************************/
37: public class NonEmptyFunction extends UnaryBoundFunctionSupport<String, Boolean>
38: {
39: @Nonnull
40: public static NonEmptyFunction nonEmpty (@Nonnull final ChangingSource<String> source)
41: {
42: return new NonEmptyFunction(source);
43: }
44:
45: public NonEmptyFunction (@Nonnull final ChangingSource<String> source)
46: {
47: super(source);
48: }
49:
50: @Override
51: protected void onSourceChange (@Nonnull final String oldSourceValue, @Nonnull final String newSourceValue)
52: {
53: final boolean oldValue = function(oldSourceValue);
54: value = function(newSourceValue);
55: fireValueChanged(oldValue, (boolean)value);
56: }
57:
58: @Override @Nonnull
59: protected Boolean function (final String value)
60: {
61: return (value != null) && !value.trim().isEmpty();
62: }
63: }