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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.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING. If not, write to the
+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
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module. An independent module is a module which is not derived from
+or based on this library. If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so. If you do not wish to do so, delete this
+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);
+
+}
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