01 /*
02 * Copyright 2008-2016 the original author or authors.
03 *
04 * Licensed under the Apache License, Version 2.0 (the "License");
05 * you may not use this file except in compliance with the License.
06 * You may obtain a copy of the License at
07 *
08 * http://www.apache.org/licenses/LICENSE-2.0
09 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16 package griffon.core;
17
18 import javax.annotation.Nonnull;
19 import javax.annotation.Nullable;
20 import java.beans.PropertyChangeListener;
21
22 /**
23 * Describes objects that provide bound properties as specified in the
24 * <a href="http://docs.oracle.com/javase/tutorial/javabeans/TOC.html">Java
25 * Bean Specification</a>.
26 *
27 * @author Andres Almiray
28 * @since 2.0.0
29 */
30 public interface Observable {
31 /**
32 * Adds the given PropertyChangeListener to the listener list.<p>
33 * The listener is registered for all bound properties of this class.
34 *
35 * @param listener the PropertyChangeListener to be added
36 * @see #removePropertyChangeListener(PropertyChangeListener)
37 */
38 void addPropertyChangeListener(@Nullable PropertyChangeListener listener);
39
40 /**
41 * Removes the given PropertyChangeListener from the listener list.<p>
42 * The listener is registered an specific property of this class.
43 *
44 * @param propertyName The name of the property to listen on.
45 * @param listener the PropertyChangeListener to be added
46 * @see #removePropertyChangeListener(String, PropertyChangeListener)
47 */
48 void addPropertyChangeListener(@Nullable String propertyName, @Nullable PropertyChangeListener listener);
49
50 /**
51 * Removes the given PropertyChangeListener from the listener list.<p>
52 * This method should be used to remove PropertyChangeListeners that were
53 * registered for all bound properties of this class.
54 *
55 * @param listener the PropertyChangeListener to be removed
56 * @see #addPropertyChangeListener(PropertyChangeListener)
57 */
58 void removePropertyChangeListener(@Nullable PropertyChangeListener listener);
59
60 /**
61 * Removes the given PropertyChangeListener from the listener list.<p>
62 * This method should be used to remove PropertyChangeListeners that were
63 * registered for an specific property of this class.
64 *
65 * @param propertyName The name of the property that was listened on.
66 * @param listener the PropertyChangeListener to be removed
67 * @see #addPropertyChangeListener(String, PropertyChangeListener)
68 */
69 void removePropertyChangeListener(@Nullable String propertyName, @Nullable PropertyChangeListener listener);
70
71 /**
72 * Returns an array of all the listeners that were added with addPropertyChangeListener().<p>
73 *
74 * @return all of the {@code PropertyChangeListeners} added or an empty array if no
75 * listeners have been added.
76 */
77 @Nonnull
78 PropertyChangeListener[] getPropertyChangeListeners();
79
80 /**
81 * Returns an array of all the listeners which have been associated
82 * with the named property.
83 *
84 * @param propertyName The name of the property being listened to
85 * @return all of the <code>PropertyChangeListeners</code> associated with
86 * the named property. If no such listeners have been added,
87 * or if <code>propertyName</code> is null, an empty array is
88 * returned.
89 */
90 @Nonnull
91 PropertyChangeListener[] getPropertyChangeListeners(@Nullable String propertyName);
92 }
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