Skip to contentMethod: NonEmptyFunction(ChangingSource)
1: /*
2: * *********************************************************************************************************************
3: *
4: * TheseFoolishThings: Miscellaneous utilities
5: * http://tidalwave.it/projects/thesefoolishthings
6: *
7: * Copyright (C) 2009 - 2023 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
12: * the License. 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
17: * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
18: * specific language governing permissions and limitations under the License.
19: *
20: * *********************************************************************************************************************
21: *
22: * git clone https://bitbucket.org/tidalwave/thesefoolishthings-src
23: * git clone https://github.com/tidalwave-it/thesefoolishthings-src
24: *
25: * *********************************************************************************************************************
26: */
27: package it.tidalwave.role.ui.function;
28:
29: import javax.annotation.Nonnull;
30: import it.tidalwave.role.ui.ChangingSource;
31:
32: /***********************************************************************************************************************
33: *
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) && !"".equals(value.trim());
62: }
63: }