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Roles are a powerful way for designing complex behaviours while keeping good practices such as Single Responsibility, Dependency Inversion and Interface Segregation.

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/*
 * *********************************************************************************************************************
 *
 * TheseFoolishThings: Miscellaneous utilities
 * http://tidalwave.it/projects/thesefoolishthings
 *
 * Copyright (C) 2009 - 2023 by 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.
 *
 * *********************************************************************************************************************
 *
 * git clone https://bitbucket.org/tidalwave/thesefoolishthings-src
 * git clone https://github.com/tidalwave-it/thesefoolishthings-src
 *
 * *********************************************************************************************************************
 */
package it.tidalwave.role.ui;

import javax.annotation.Nonnull;
import java.beans.PropertyChangeListener;

/***********************************************************************************************************************
 *
 * @author  Fabrizio Giudici
 *
 **********************************************************************************************************************/
public interface ChangingSource
  {
    @Nonnull
    public PropertyChangeListener[] getPropertyChangeListeners();

    public void addPropertyChangeListener (@Nonnull PropertyChangeListener listener);

    public void removePropertyChangeListener (@Nonnull PropertyChangeListener listener);

    /*******************************************************************************************************************
     *
     * Removes all the bindings of this object.
     *
     ******************************************************************************************************************/
    public void unbindAll();

    /*******************************************************************************************************************
     *
     * Returns the value of this object.
     *
     * @return    the value
     *
     ******************************************************************************************************************/
    public T get();
  }