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.ReadOnlyLongPropertyBase;
  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 ReadOnlyJavaBeanLongProperty} provides an adapter between a regular
  42  * read only Java Bean property of type {@code long} or {@code Long} and a JavaFX
  43  * {@code ReadOnlyLongProperty}. It cannot be created directly, but a
  44  * {@link ReadOnlyJavaBeanLongPropertyBuilder} 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 ReadOnlyJavaBeanLongProperty} 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.ReadOnlyLongProperty
  62  * @see ReadOnlyJavaBeanLongPropertyBuilder
  63  * @since JavaFX 2.1
  64  */
  65 public final class ReadOnlyJavaBeanLongProperty extends ReadOnlyLongPropertyBase implements ReadOnlyJavaBeanProperty<Number> {
  66 
  67     private final ReadOnlyPropertyDescriptor descriptor;
  68     private final ReadOnlyPropertyDescriptor.ReadOnlyListener<Number> listener;
  69 
  70     private final AccessControlContext acc = AccessController.getContext();
  71 
  72     ReadOnlyJavaBeanLongProperty(ReadOnlyPropertyDescriptor descriptor, Object bean) {
  73         this.descriptor = descriptor;
  74         this.listener = descriptor.new ReadOnlyListener<Number>(bean, this);
  75         descriptor.addListener(listener);
  76         Disposer.addRecord(this, new DescriptorListenerCleaner(descriptor, listener));
  77     }
  78 
  79     /**
  80      * {@inheritDoc}
  81      *
  82      * @throws UndeclaredThrowableException if calling the getter of the Java Bean
  83      * property throws an {@code IllegalAccessException} or an
  84      * {@code InvocationTargetException}.
  85      */
  86     @Override
  87     public long get() {
  88         return AccessController.doPrivileged((PrivilegedAction<Long>) () -> {
  89             try {
  90                 return ((Number)MethodHelper.invoke(
  91                     descriptor.getGetter(), getBean(), (Object[])null)).longValue();
  92             } catch (IllegalAccessException e) {
  93                 throw new UndeclaredThrowableException(e);
  94             } catch (InvocationTargetException e) {
  95                 throw new UndeclaredThrowableException(e);
  96             }
  97         }, acc);
  98     }
  99 
 100     /**
 101      * {@inheritDoc}
 102      */
 103     @Override
 104     public Object getBean() {
 105         return listener.getBean();
 106     }
 107 
 108     /**
 109      * {@inheritDoc}
 110      */
 111     @Override
 112     public String getName() {
 113         return descriptor.getName();
 114     }
 115 
 116     /**
 117      * {@inheritDoc}
 118      */
 119     @Override
 120     public void fireValueChangedEvent() {
 121         super.fireValueChangedEvent();
 122     }
 123 
 124     /**
 125      * {@inheritDoc}
 126      */
 127     @Override
 128     public void dispose() {
 129         descriptor.removeListener(listener);
 130     }
 131 }