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.ReadOnlyObjectPropertyBase;
  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 ReadOnlyJavaBeanObjectProperty} provides an adapter between a regular
  43  * read only Java Bean property of {@code T} and a JavaFX
  44  * {@code ReadOnlyObjectProperty}. It cannot be created directly, but a
  45  * {@link ReadOnlyJavaBeanObjectPropertyBuilder} 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 ReadOnlyJavaBeanObjectProperty} 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.ReadOnlyObjectProperty
  55  * @see ReadOnlyJavaBeanObjectPropertyBuilder
  56  *
  57  * @param T the type of the wrapped {@code Object}
  58  * @since JavaFX 2.1
  59  */
  60 public final class ReadOnlyJavaBeanObjectProperty<T> extends ReadOnlyObjectPropertyBase<T> implements ReadOnlyJavaBeanProperty<T> {
  61 
  62     private final ReadOnlyPropertyDescriptor descriptor;
  63     private final ReadOnlyPropertyDescriptor.ReadOnlyListener<T> listener;
  64 
  65     private final AccessControlContext acc = AccessController.getContext();
  66 
  67     ReadOnlyJavaBeanObjectProperty(ReadOnlyPropertyDescriptor descriptor, Object bean) {
  68         this.descriptor = descriptor;
  69         this.listener = descriptor.new ReadOnlyListener<T>(bean, this);
  70         descriptor.addListener(listener);
  71         Disposer.addRecord(this, new DescriptorListenerCleaner(descriptor, listener));
  72     }
  73 
  74     /**
  75      * {@inheritDoc}
  76      *
  77      * @throws UndeclaredThrowableException if calling the getter of the Java Bean
  78      * property throws an {@code IllegalAccessException} or an
  79      * {@code InvocationTargetException}.
  80      */
  81     @Override
  82     public T get() {
  83         return AccessController.doPrivileged((PrivilegedAction<T>) () -> {
  84             try {
  85                 return (T)MethodUtil.invoke(descriptor.getGetter(), getBean(), (Object[])null);
  86             } catch (IllegalAccessException e) {
  87                 throw new UndeclaredThrowableException(e);
  88             } catch (InvocationTargetException e) {
  89                 throw new UndeclaredThrowableException(e);
  90             }
  91         }, acc);
  92     }
  93 
  94     /**
  95      * {@inheritDoc}
  96      */
  97     @Override
  98     public Object getBean() {
  99         return listener.getBean();
 100     }
 101 
 102     /**
 103      * {@inheritDoc}
 104      */
 105     @Override
 106     public String getName() {
 107         return descriptor.getName();
 108     }
 109 
 110     /**
 111      * {@inheritDoc}
 112      */
 113     @Override
 114     public void fireValueChangedEvent() {
 115         super.fireValueChangedEvent();
 116     }
 117 
 118     /**
 119      * {@inheritDoc}
 120      */
 121     @Override
 122     public void dispose() {
 123         descriptor.removeListener(listener);
 124 
 125     }
 126 }