NonEmptyFunction.java

  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. import javax.annotation.Nonnull;
  29. import it.tidalwave.role.ui.ChangingSource;

  30. /***********************************************************************************************************************
  31.  *
  32.  * @author  Fabrizio Giudici
  33.  *
  34.  **********************************************************************************************************************/
  35. public class NonEmptyFunction extends UnaryBoundFunctionSupport<String, Boolean>
  36.   {
  37.     @Nonnull
  38.     public static NonEmptyFunction nonEmpty (@Nonnull final ChangingSource<String> source)
  39.       {
  40.         return new NonEmptyFunction(source);
  41.       }

  42.     public NonEmptyFunction (@Nonnull final ChangingSource<String> source)
  43.       {
  44.         super(source);
  45.       }

  46.     @Override
  47.     protected void onSourceChange (@Nonnull final String oldSourceValue, @Nonnull final String newSourceValue)
  48.       {
  49.         final boolean oldValue = function(oldSourceValue);
  50.         value = function(newSourceValue);
  51.         fireValueChanged(oldValue, (boolean)value);
  52.       }

  53.     @Override @Nonnull
  54.     protected Boolean function (final String value)
  55.       {
  56.         return (value != null) && !"".equals(value.trim());
  57.       }
  58.   }