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/*
 * #%L
 * *********************************************************************************************************************
 * 
 * These Foolish Things - Miscellaneous utilities
 * http://thesefoolishthings.tidalwave.it - git clone [email protected]:tidalwave/thesefoolishthings-src.git
 * %%
 * Copyright (C) 2009 - 2016 Tidalwave s.a.s. (http://tidalwave.it)
 * %%
 * *********************************************************************************************************************
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * 
 *     http://www.apache.org/licenses/LICENSE-2.0
 * 
 * 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 CONDITIONS OF ANY KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations under the License.
 * 
 * *********************************************************************************************************************
 * 
 * $Id$
 * 
 * *********************************************************************************************************************
 * #L%
 */
package it.tidalwave.role.ui.function;

import javax.annotation.Nonnull;
import it.tidalwave.role.ui.ChangingSource;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;

/***********************************************************************************************************************
 *
 * @author  Fabrizio Giudici
 * @version $Id$
 *
 **********************************************************************************************************************/
public abstract class BooleanBoundFunctionSupport extends BoundFunctionSupport
  {
    protected final ChangingSource[] sources;

    private boolean oldValue;

    private boolean newValue;

    private final PropertyChangeListener pcl = new PropertyChangeListener()
      {
        @Override
        public void propertyChange (final @Nonnull PropertyChangeEvent event)
          {
            newValue = function();
            fireValueChanged(oldValue, newValue);
            oldValue = newValue;
          };
      };

    public BooleanBoundFunctionSupport (final @Nonnull ChangingSource ... sources)
      {
        this.sources = sources;

        for (final ChangingSource source : sources)
          {
            source.addPropertyChangeListener(pcl);
          }

        oldValue = function();
      }

    protected abstract boolean function();

    @Override @Nonnull
    public final Boolean get()
      {
        return newValue;
      }
  }