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1 /*******************************************************************************
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2 * Copyright (c) 2006, 2008 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM Corporation - initial API and implementation
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10 *******************************************************************************/
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11
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12 module org.eclipse.core.databinding.observable.value.IObservableValue;
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81
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13 import org.eclipse.core.databinding.observable.value.IValueChangeListener;
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78
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14
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15 import java.lang.all;
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16
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17 import org.eclipse.core.databinding.observable.IObservable;
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18 import org.eclipse.core.databinding.observable.Realm;
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19
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20 /**
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21 * A value whose changes can be tracked by value change listeners.
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22 *
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23 * @noextend This interface is not intended to be extended by clients.
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24 * @noimplement This interface is not intended to be implemented by clients.
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25 * Clients should instead subclass one of the classes that
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26 * implement this interface. Note that direct implementers of this
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27 * interface outside of the framework will be broken in future
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28 * releases when methods are added to this interface.
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29 *
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30 * @see AbstractObservableValue
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31 *
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32 * @since 1.0
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33 */
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34 public interface IObservableValue : IObservable {
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35
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36 /**
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37 * The value type of this observable value, or <code>null</code> if this
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38 * observable value is untyped.
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39 *
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40 * @return the value type, or <code>null</null>
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41 */
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42 public Object getValueType();
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43
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44 /**
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45 * Returns the value. Must be invoked in the {@link Realm} of the observable.
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46 *
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47 * @return the current value
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48 * @TrackedGetter
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49 */
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50 public Object getValue();
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51
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52 /**
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53 * Sets the value. Must be invoked in the {@link Realm} of the observable.
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54 *
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55 * @param value
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56 * the value to set
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57 * @throws UnsupportedOperationException
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58 * if this observable value cannot be set.
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59 */
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60 public void setValue(Object value);
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61
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62 /**
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63 *
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64 * @param listener
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65 */
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66 public void addValueChangeListener(IValueChangeListener listener);
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67
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68 /**
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69 * @param listener
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70 */
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71 public void removeValueChangeListener(IValueChangeListener listener);
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72 }
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