1 /*
   2  * Copyright (c) 2013, 2014, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 package javafx.collections;
  26 
  27 import com.sun.javafx.collections.ArrayListenerHelper;
  28 import javafx.beans.InvalidationListener;
  29 
  30 /**
  31  * Abstract class that serves as a base class for {@link ObservableArray} implementations.
  32  * The base class provides listener handling functionality by implementing
  33  * {@code addListener} and {@code removeListener} methods.
  34  * {@link #fireChange(boolean, int, int) } method is provided
  35  *      for notifying the listeners.
  36  * @param <T> actual array instance type
  37  * @see ObservableArray
  38  * @see ArrayChangeListener
  39  * @since JavaFX 8.0
  40  */
  41 public abstract class ObservableArrayBase<T extends ObservableArray<T>> implements ObservableArray<T> {
  42 
  43     private ArrayListenerHelper<T> listenerHelper;
  44 
  45     @Override public final void addListener(InvalidationListener listener) {
  46         listenerHelper = ArrayListenerHelper.<T>addListener(listenerHelper, (T) this, listener);
  47     }
  48 
  49     @Override public final void removeListener(InvalidationListener listener) {
  50         listenerHelper = ArrayListenerHelper.removeListener(listenerHelper, listener);
  51     }
  52 
  53     @Override public final void addListener(ArrayChangeListener<T> listener) {
  54         listenerHelper = ArrayListenerHelper.<T>addListener(listenerHelper, (T) this, listener);
  55     }
  56 
  57     @Override public final void removeListener(ArrayChangeListener<T> listener) {
  58         listenerHelper = ArrayListenerHelper.removeListener(listenerHelper, listener);
  59     }
  60 
  61     /**
  62      * Notifies all listeners of a change
  63      * @param change
  64      */
  65     protected final void fireChange(boolean sizeChanged, int from, int to) {
  66         ArrayListenerHelper.fireValueChangedEvent(listenerHelper, sizeChanged, from, to);
  67     }
  68 }