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/* SpinnerModel.java --

   Copyright (C) 2003, 2004  Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation; either version 2, or (at your option)

any later version.

GNU Classpath is distributed in the hope that it will be useful, but

WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

General Public License for more details.

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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

02110-1301 USA.

Linking this library statically or dynamically with other modules is

making a combined work based on this library.  Thus, the terms and

conditions of the GNU General Public License cover the whole

combination.

As a special exception, the copyright holders of this library give you

permission to link this library with independent modules to produce an

executable, regardless of the license terms of these independent

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independent module, the terms and conditions of the license of that

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this exception to your version of the library, but you are not

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exception statement from your version. */

package javax.swing;

import javax.swing.event.ChangeListener;

/**

 * The data model that is used in {@link JSpinner}s.

 *

 * @since 1.4

 */

public interface SpinnerModel

{

  /**

   * Sets the current value of the model to that specified.

   * Implementations can choose to refuse to accept the value

   * and throw an exception instead.  For example, a date model

   * may throw invalid dates, or a list model may throw out

   * values which don't exist in the underlying list.  Models

   * may also throw out unusual values, such as null.  The decision

   * is left to the discretion of the implementator.  If the

   * operation succeeds, the implementation should also notify

   * any registered <code>ChangeListener</code>s.

   *

   * @param value The new value of the model.

   * @throws IllegalArgumentException if the model does not accept

   *         the given value.

   */

  void setValue(Object value);

  /**

   * Returns the current value of the model.

   *

   * @return The current value.

   */

  Object getValue();

  /**

   * Returns the next value from the model.  If the model is bounded,

   * this method may return null when the upper bound is met.

   * The current value is not changed.

   *

   * @return The next value, or null if there are no more values

   *         to retrieve.

   */

  Object getNextValue();

  /**

   * Returns the previous value from the model.  If the model is

   * bounded, this method may return null when the lower bound is

   * met.  The current value is not changed.

   *

   * @return The previous value, or null if there are no more

   *         values to retrieve.

   */

  Object getPreviousValue();

  /**

   * Adds a <code>ChangeListener</code> to the list of registered

   * listeners.  Each listener is notified when the current value

   * is changed.

   *

   * @param listener The new listener to register.

   */

  void addChangeListener(ChangeListener listener);

  /**

   * Removes a given <code>ChangeListener</code> from the list

   * of registered listeners.

   *

   * @param listener The listener to remove.

   */

  void removeChangeListener(ChangeListener listener);

}