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 }