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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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/*
 * #%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;

import javax.annotation.Nonnull;
import java.beans.PropertyChangeListener;
import java.util.Locale;
import java.util.Map;

/***********************************************************************************************************************
 *
 * A specialized {@link Displayable} which is mutable (that is, its display name can be changed) and fires
 * {@code PropertyChangeEvent}s.
 *
 * @stereotype Role
 *
 * @author  Fabrizio Giudici
 * @version $Id$
 * @it.tidalwave.javadoc.stable
 *
 **********************************************************************************************************************/
public interface MutableDisplayable extends Displayable
  {
    public final static Class MutableDisplayable = MutableDisplayable.class;

    /** The property name for displayName */
    public final static String PROP_DISPLAY_NAME = "displayName";

    /** The property name for displayNames */
    public final static String PROP_DISPLAY_NAMES = "displayNames";

    /*******************************************************************************************************************
     *
     * Sets the display name in {@code Locale.ENGLISH}.
     *
     * @param  displayName  the display name
     *
     ******************************************************************************************************************/
    public void setDisplayName (@Nonnull String displayName);

    /*******************************************************************************************************************
     *
     * Sets the display name in the given {@code Locale}.
     *
     * @param  displayName  the display name
     * @param  locale       the locale
     *
     ******************************************************************************************************************/
    public void setDisplayName (@Nonnull String displayName, @Nonnull Locale locale);

    /*******************************************************************************************************************
     *
     * Sets a bag of display names for a number of {@code Locale}s.
     *
     * @param  displayNames  the display names
     *
     ******************************************************************************************************************/
    public void setDisplayNames (@Nonnull Map displayNames);

    /*******************************************************************************************************************
     *
     * Registers a {@link PropertyChangeListener}.
     *
     * @param  listener   the listener
     *
     ******************************************************************************************************************/
    public void addPropertyChangeListener (@Nonnull PropertyChangeListener listener);

    /*******************************************************************************************************************
     *
     * Unregisters a {@link PropertyChangeListener}.
     *
     * @param  listener   the listener
     *
     ******************************************************************************************************************/
    public void removePropertyChangeListener (@Nonnull PropertyChangeListener listener);
  }