1 /*
   2  * Copyright (c) 2011, 2017, 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.MethodHelper;
  29 import com.sun.javafx.property.adapter.Disposer;
  30 import com.sun.javafx.property.adapter.ReadOnlyPropertyDescriptor;
  31 import javafx.beans.property.ReadOnlyObjectPropertyBase;
  32 
  33 import java.lang.reflect.InvocationTargetException;
  34 import java.lang.reflect.UndeclaredThrowableException;
  35 
  36 import java.security.AccessController;
  37 import java.security.AccessControlContext;
  38 import java.security.PrivilegedAction;
  39 
  40 /**
  41  * A {@code ReadOnlyJavaBeanObjectProperty} provides an adapter between a regular
  42  * read only Java Bean property of {@code T} and a JavaFX
  43  * {@code ReadOnlyObjectProperty}. It cannot be created directly, but a
  44  * {@link ReadOnlyJavaBeanObjectPropertyBuilder} has to be used.
  45  * <p>
  46  * As a minimum, the Java Bean class must implement a getter for the
  47  * property. If the getter of an instance of this class is called, the property of
  48  * the Java Bean is returned. If the Java Bean property is bound (i.e. it supports
  49  * PropertyChangeListeners), this {@code ReadOnlyJavaBeanObjectProperty} will be
  50  * aware of changes in the Java Bean. Otherwise it can be notified about
  51  * changes by calling {@link #fireValueChangedEvent()}.
  52  * </p>
  53  * <p>
  54  * The Java Bean class must be declared public. If that class is in a named
  55  * module, then the module must {@link Module#isOpen(String,Module) open}
  56  * the containing package to at least the {@code javafx.base} module
  57  * (or {@link Module#isExported(String) export} the containing package
  58  * unconditionally).
  59  * </p>
  60  *
  61  * @see javafx.beans.property.ReadOnlyObjectProperty
  62  * @see ReadOnlyJavaBeanObjectPropertyBuilder
  63  *
  64  * @param T the type of the wrapped {@code Object}
  65  * @since JavaFX 2.1
  66  */
  67 public final class ReadOnlyJavaBeanObjectProperty<T> extends ReadOnlyObjectPropertyBase<T> implements ReadOnlyJavaBeanProperty<T> {
  68 
  69     private final ReadOnlyPropertyDescriptor descriptor;
  70     private final ReadOnlyPropertyDescriptor.ReadOnlyListener<T> listener;
  71 
  72     private final AccessControlContext acc = AccessController.getContext();
  73 
  74     ReadOnlyJavaBeanObjectProperty(ReadOnlyPropertyDescriptor descriptor, Object bean) {
  75         this.descriptor = descriptor;
  76         this.listener = descriptor.new ReadOnlyListener<T>(bean, this);
  77         descriptor.addListener(listener);
  78         Disposer.addRecord(this, new DescriptorListenerCleaner(descriptor, listener));
  79     }
  80 
  81     /**
  82      * {@inheritDoc}
  83      *
  84      * @throws UndeclaredThrowableException if calling the getter of the Java Bean
  85      * property throws an {@code IllegalAccessException} or an
  86      * {@code InvocationTargetException}.
  87      */
  88     @Override
  89     public T get() {
  90         return AccessController.doPrivileged((PrivilegedAction<T>) () -> {
  91             try {
  92                 return (T)MethodHelper.invoke(descriptor.getGetter(), getBean(), (Object[])null);
  93             } catch (IllegalAccessException e) {
  94                 throw new UndeclaredThrowableException(e);
  95             } catch (InvocationTargetException e) {
  96                 throw new UndeclaredThrowableException(e);
  97             }
  98         }, acc);
  99     }
 100 
 101     /**
 102      * {@inheritDoc}
 103      */
 104     @Override
 105     public Object getBean() {
 106         return listener.getBean();
 107     }
 108 
 109     /**
 110      * {@inheritDoc}
 111      */
 112     @Override
 113     public String getName() {
 114         return descriptor.getName();
 115     }
 116 
 117     /**
 118      * {@inheritDoc}
 119      */
 120     @Override
 121     public void fireValueChangedEvent() {
 122         super.fireValueChangedEvent();
 123     }
 124 
 125     /**
 126      * {@inheritDoc}
 127      */
 128     @Override
 129     public void dispose() {
 130         descriptor.removeListener(listener);
 131 
 132     }
 133 }