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 it.tidalwave.role.ui.ChangingSource;
30
31 /***************************************************************************************************************************************************************
32 *
33 * @author Fabrizio Giudici
34 *
35 **************************************************************************************************************************************************************/
36 public class NonEmptyFunction extends UnaryBoundFunctionSupport<String, Boolean>
37 {
38 @Nonnull
39 public static NonEmptyFunction nonEmpty (@Nonnull final ChangingSource<String> source)
40 {
41 return new NonEmptyFunction(source);
42 }
43
44 public NonEmptyFunction (@Nonnull final ChangingSource<String> source)
45 {
46 super(source);
47 }
48
49 @Override
50 protected void onSourceChange (@Nonnull final String oldSourceValue, @Nonnull final String newSourceValue)
51 {
52 final boolean oldValue = function(oldSourceValue);
53 value = function(newSourceValue);
54 fireValueChanged(oldValue, (boolean)value);
55 }
56
57 @Override @Nonnull
58 protected Boolean function (final String value)
59 {
60 return (value != null) && !value.trim().isEmpty();
61 }
62 }