UnaryBoundFunctionSupport.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.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 abstract class UnaryBoundFunctionSupport<DOMAIN_TYPE, CODOMAIN_TYPE>
  36.                    extends BoundFunctionSupport<DOMAIN_TYPE, CODOMAIN_TYPE>
  37.   {
  38.     @Nonnull
  39.     protected final ChangingSource<DOMAIN_TYPE> source;

  40.     protected CODOMAIN_TYPE value;

  41.     protected UnaryBoundFunctionSupport (@Nonnull final ChangingSource<DOMAIN_TYPE> source)
  42.       {
  43.         this.source = source;
  44.         source.addPropertyChangeListener(event ->
  45.                 onSourceChange((DOMAIN_TYPE)event.getOldValue(), (DOMAIN_TYPE)event.getNewValue()));
  46.       }

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

  53.     @Nonnull
  54.     protected abstract CODOMAIN_TYPE function (final DOMAIN_TYPE value);

  55.     @Override @Nonnull
  56.     public final CODOMAIN_TYPE get()
  57.       {
  58.         return value;
  59.       }
  60.   }