CopyIfEmptyOrConform.java

  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. import jakarta.annotation.Nonnull;
  28. import it.tidalwave.ui.core.ChangingSource;

  29. /***************************************************************************************************************************************************************
  30.  *
  31.  * @since   2.0-ALPHA-1
  32.  * @author  Fabrizio Giudici
  33.  *
  34.  **************************************************************************************************************************************************************/
  35. public class CopyIfEmptyOrConform extends WeakCopyFunctionSupport<String>
  36.   {
  37.     @Nonnull
  38.     public static CopyIfEmptyOrConform copyIfEmptyOrConform (@Nonnull final ChangingSource<String> source)
  39.       {
  40.         return new CopyIfEmptyOrConform(source);
  41.       }

  42.     private CopyIfEmptyOrConform (@Nonnull final ChangingSource<String> sourceProperty)
  43.       {
  44.         super(sourceProperty);
  45.       }

  46.     @Override
  47.     protected boolean shouldChange (@Nonnull final String oldValue, @Nonnull final String newValue)
  48.       {
  49.         return oldValue.equals(targetValue) || targetValue.isEmpty();
  50.       }
  51.   }