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.binding.ExpressionHelper; 29 import com.sun.javafx.property.adapter.Disposer; 30 import com.sun.javafx.property.adapter.PropertyDescriptor; 31 import javafx.beans.InvalidationListener; 32 import javafx.beans.property.DoubleProperty; 33 import javafx.beans.value.ChangeListener; 34 import javafx.beans.value.ObservableValue; 35 36 import java.lang.reflect.InvocationTargetException; 37 import java.lang.reflect.UndeclaredThrowableException; 38 39 import java.security.AccessControlContext; 40 import java.security.AccessController; 41 import java.security.PrivilegedAction; 42 43 import sun.reflect.misc.MethodUtil; 44 45 /** 46 * A {@code JavaBeanDoubleProperty} provides an adapter between a regular 47 * Java Bean property of type {@code double} or {@code Double} and a JavaFX 48 * {@code DoubleProperty}. It cannot be created directly, but a 49 * {@link JavaBeanDoublePropertyBuilder} has to be used. 50 * <p> 51 * As a minimum, the Java Bean must implement a getter and a setter for the 52 * property. If the getter of an instance of this class is called, the property of 53 * the Java Bean is returned. If the setter is called, the value will be passed 54 * to the Java Bean property. If the Java Bean property is bound (i.e. it supports 55 * PropertyChangeListeners), this {@code JavaBeanDoubleProperty} will be 56 * aware of changes in the Java Bean. Otherwise it can be notified about 57 * changes by calling {@link #fireValueChangedEvent()}. If the Java Bean property 58 * is also constrained (i.e. it supports VetoableChangeListeners), this 59 * {@code JavaBeanDoubleProperty} will reject changes, if it is bound to an 60 * {@link javafx.beans.value.ObservableValue ObservableValue<Double>}. 61 * 62 * @see javafx.beans.property.DoubleProperty 63 * @see JavaBeanDoublePropertyBuilder 64 * @since JavaFX 2.1 65 */ 66 public final class JavaBeanDoubleProperty extends DoubleProperty implements JavaBeanProperty<Number> { 67 68 private final PropertyDescriptor descriptor; 69 private final PropertyDescriptor.Listener<Number> listener; 70 71 private ObservableValue<? extends Number> observable = null; 72 private ExpressionHelper<Number> helper = null; 73 74 private final AccessControlContext acc = AccessController.getContext(); 75 76 JavaBeanDoubleProperty(PropertyDescriptor descriptor, Object bean) { 77 this.descriptor = descriptor; 78 this.listener = descriptor.new Listener<Number>(bean, this); 79 descriptor.addListener(listener); 80 Disposer.addRecord(this, new DescriptorListenerCleaner(descriptor, listener)); 81 } 82 83 /** 84 * {@inheritDoc} 85 * 86 * @throws UndeclaredThrowableException if calling the getter of the Java Bean 87 * property throws an {@code IllegalAccessException} or an 88 * {@code InvocationTargetException}. 89 */ 90 @Override 91 public double get() { 92 return AccessController.doPrivileged((PrivilegedAction<Double>) () -> { 93 try { 94 return ((Number)MethodUtil.invoke( 95 descriptor.getGetter(), getBean(), (Object[])null)).doubleValue(); 96 } catch (IllegalAccessException e) { 97 throw new UndeclaredThrowableException(e); 98 } catch (InvocationTargetException e) { 99 throw new UndeclaredThrowableException(e); 100 } 101 }, acc); 102 } 103 104 /** 105 * {@inheritDoc} 106 * 107 * @throws UndeclaredThrowableException if calling the getter of the Java Bean 108 * property throws an {@code IllegalAccessException} or an 109 * {@code InvocationTargetException}. 110 */ 111 @Override 112 public void set(final double value) { 113 if (isBound()) { 114 throw new RuntimeException("A bound value cannot be set."); 115 } 116 117 AccessController.doPrivileged((PrivilegedAction<Void>) () -> { 118 try { 119 MethodUtil.invoke(descriptor.getSetter(), getBean(), new Object[] {value}); 120 ExpressionHelper.fireValueChangedEvent(helper); 121 } catch (IllegalAccessException e) { 122 throw new UndeclaredThrowableException(e); 123 } catch (InvocationTargetException e) { 124 throw new UndeclaredThrowableException(e); 125 } 126 return null; 127 }, acc); 128 } 129 130 /** 131 * {@inheritDoc} 132 */ 133 @Override 134 public void bind(ObservableValue<? extends Number> observable) { 135 if (observable == null) { 136 throw new NullPointerException("Cannot bind to null"); 137 } 138 139 if (!observable.equals(this.observable)) { 140 unbind(); 141 set(observable.getValue().doubleValue()); 142 this.observable = observable; 143 this.observable.addListener(listener); 144 } 145 } 146 147 /** 148 * {@inheritDoc} 149 */ 150 @Override 151 public void unbind() { 152 if (observable != null) { 153 observable.removeListener(listener); 154 observable = null; 155 } 156 } 157 158 /** 159 * {@inheritDoc} 160 */ 161 @Override 162 public boolean isBound() { 163 return observable != null; 164 } 165 166 /** 167 * {@inheritDoc} 168 */ 169 @Override 170 public Object getBean() { 171 return listener.getBean(); 172 } 173 174 /** 175 * {@inheritDoc} 176 */ 177 @Override 178 public String getName() { 179 return descriptor.getName(); 180 } 181 182 /** 183 * {@inheritDoc} 184 */ 185 @Override 186 public void addListener(ChangeListener<? super Number> listener) { 187 helper = ExpressionHelper.addListener(helper, this, listener); 188 } 189 190 /** 191 * {@inheritDoc} 192 */ 193 @Override 194 public void removeListener(ChangeListener<? super Number> listener) { 195 helper = ExpressionHelper.removeListener(helper, listener); 196 } 197 198 /** 199 * {@inheritDoc} 200 */ 201 @Override 202 public void addListener(InvalidationListener listener) { 203 helper = ExpressionHelper.addListener(helper, this, listener); 204 } 205 206 /** 207 * {@inheritDoc} 208 */ 209 @Override 210 public void removeListener(InvalidationListener listener) { 211 helper = ExpressionHelper.removeListener(helper, listener); 212 } 213 214 /** 215 * {@inheritDoc} 216 */ 217 @Override 218 public void fireValueChangedEvent() { 219 ExpressionHelper.fireValueChangedEvent(helper); 220 } 221 222 /** 223 * {@inheritDoc} 224 */ 225 @Override 226 public void dispose() { 227 descriptor.removeListener(listener); 228 229 } 230 231 /** 232 * Returns a string representation of this {@code JavaBeanDoubleProperty} object. 233 * @return a string representation of this {@code JavaBeanDoubleProperty} object. 234 */ 235 @Override 236 public String toString() { 237 final Object bean = getBean(); 238 final String name = getName(); 239 final StringBuilder result = new StringBuilder("DoubleProperty ["); 240 if (bean != null) { 241 result.append("bean: ").append(bean).append(", "); 242 } 243 if ((name != null) && (!name.equals(""))) { 244 result.append("name: ").append(name).append(", "); 245 } 246 if (isBound()) { 247 result.append("bound, "); 248 } 249 result.append("value: ").append(get()); 250 result.append("]"); 251 return result.toString(); 252 } 253 }