1 /*
   2  * Copyright (c) 2011, 2015, 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 
  26 package javafx.beans.property.adapter;
  27 
  28 import com.sun.javafx.property.adapter.Disposer;
  29 import com.sun.javafx.property.adapter.ReadOnlyPropertyDescriptor;
  30 import javafx.beans.property.ReadOnlyLongPropertyBase;
  31 
  32 import java.lang.reflect.InvocationTargetException;
  33 import java.lang.reflect.UndeclaredThrowableException;
  34 
  35 import java.security.AccessController;
  36 import java.security.AccessControlContext;
  37 import java.security.PrivilegedAction;
  38 
  39 import sun.reflect.misc.MethodUtil;
  40 
  41 /**
  42  * A {@code ReadOnlyJavaBeanLongProperty} provides an adapter between a regular
  43  * read only Java Bean property of type {@code long} or {@code Long} and a JavaFX
  44  * {@code ReadOnlyLongProperty}. It cannot be created directly, but a
  45  * {@link ReadOnlyJavaBeanLongPropertyBuilder} has to be used.
  46  * <p>
  47  * As a minimum, the Java Bean must implement a getter for the
  48  * property. If the getter of an instance of this class is called, the property of
  49  * the Java Bean is returned. If the Java Bean property is bound (i.e. it supports
  50  * PropertyChangeListeners), this {@code ReadOnlyJavaBeanLongProperty} will be
  51  * aware of changes in the Java Bean. Otherwise it can be notified about
  52  * changes by calling {@link #fireValueChangedEvent()}.
  53  *
  54  * @see javafx.beans.property.ReadOnlyLongProperty
  55  * @see ReadOnlyJavaBeanLongPropertyBuilder
  56  * @since JavaFX 2.1
  57  */
  58 public final class ReadOnlyJavaBeanLongProperty extends ReadOnlyLongPropertyBase implements ReadOnlyJavaBeanProperty<Number> {
  59 
  60     private final ReadOnlyPropertyDescriptor descriptor;
  61     private final ReadOnlyPropertyDescriptor.ReadOnlyListener<Number> listener;
  62 
  63     private final AccessControlContext acc = AccessController.getContext();
  64 
  65     ReadOnlyJavaBeanLongProperty(ReadOnlyPropertyDescriptor descriptor, Object bean) {
  66         this.descriptor = descriptor;
  67         this.listener = descriptor.new ReadOnlyListener<Number>(bean, this);
  68         descriptor.addListener(listener);
  69         Disposer.addRecord(this, new DescriptorListenerCleaner(descriptor, listener));
  70     }
  71 
  72     /**
  73      * {@inheritDoc}
  74      *
  75      * @throws UndeclaredThrowableException if calling the getter of the Java Bean
  76      * property throws an {@code IllegalAccessException} or an
  77      * {@code InvocationTargetException}.
  78      */
  79     @Override
  80     public long get() {
  81         return AccessController.doPrivileged((PrivilegedAction<Long>) () -> {
  82             try {
  83                 return ((Number)MethodUtil.invoke(
  84                     descriptor.getGetter(), getBean(), (Object[])null)).longValue();
  85             } catch (IllegalAccessException e) {
  86                 throw new UndeclaredThrowableException(e);
  87             } catch (InvocationTargetException e) {
  88                 throw new UndeclaredThrowableException(e);
  89             }
  90         }, acc);
  91     }
  92 
  93     /**
  94      * {@inheritDoc}
  95      */
  96     @Override
  97     public Object getBean() {
  98         return listener.getBean();
  99     }
 100 
 101     /**
 102      * {@inheritDoc}
 103      */
 104     @Override
 105     public String getName() {
 106         return descriptor.getName();
 107     }
 108 
 109     /**
 110      * {@inheritDoc}
 111      */
 112     @Override
 113     public void fireValueChangedEvent() {
 114         super.fireValueChangedEvent();
 115     }
 116 
 117     /**
 118      * {@inheritDoc}
 119      */
 120     @Override
 121     public void dispose() {
 122         descriptor.removeListener(listener);
 123     }
 124 }