| /******************************************************************************* |
| * Copyright (c) 2005, 2009 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| * Matthew Hall - bug 118516 |
| *******************************************************************************/ |
| package org.eclipse.core.internal.databinding.beans; |
| |
| import java.beans.PropertyChangeListener; |
| import java.lang.reflect.InvocationTargetException; |
| import java.lang.reflect.Method; |
| |
| import org.eclipse.core.databinding.beans.BeanProperties; |
| import org.eclipse.core.databinding.util.Policy; |
| import org.eclipse.core.runtime.Assert; |
| import org.eclipse.core.runtime.IStatus; |
| import org.eclipse.core.runtime.Status; |
| |
| /** |
| * This is a helper that will hook up and listen for |
| * <code>PropertyChangeEvent</code> events for a set of target JavaBeans |
| * |
| * @since 1.0 |
| */ |
| public class BeanPropertyListenerSupport { |
| /** |
| * Start listen to target (if it supports the JavaBean property change |
| * listener pattern) |
| * |
| * @param bean |
| * @param propertyName |
| * @param listener |
| */ |
| public static void hookListener(Object bean, String propertyName, |
| PropertyChangeListener listener) { |
| Assert.isNotNull(bean, "Bean cannot be null"); //$NON-NLS-1$ |
| Assert.isNotNull(listener, "Listener cannot be null"); //$NON-NLS-1$ |
| Assert.isNotNull(propertyName, "Property name cannot be null"); //$NON-NLS-1$ |
| processListener(bean, propertyName, listener, |
| "addPropertyChangeListener", "Could not attach listener to ");//$NON-NLS-1$ //$NON-NLS-2$ |
| } |
| |
| /** |
| * Stop listen to target |
| * |
| * @param bean |
| * @param propertyName |
| * @param listener |
| */ |
| public static void unhookListener(Object bean, String propertyName, |
| PropertyChangeListener listener) { |
| Assert.isNotNull(bean, "Bean cannot be null"); //$NON-NLS-1$ |
| Assert.isNotNull(listener, "Listener cannot be null"); //$NON-NLS-1$ |
| Assert.isNotNull(propertyName, "Property name cannot be null"); //$NON-NLS-1$ |
| |
| processListener( |
| bean, |
| propertyName, |
| listener, |
| "removePropertyChangeListener", "Cound not remove listener from "); //$NON-NLS-1$ //$NON-NLS-2$ |
| } |
| |
| /** |
| * Invokes the method for the provided <code>methodName</code> attempting to |
| * first use the method with the property name and then the unnamed version. |
| * |
| * @param bean |
| * object to invoke the method on |
| * @param methodName |
| * either addPropertyChangeListener or |
| * removePropertyChangeListener |
| * @param message |
| * string that will be prefixed to the target in an error message |
| * |
| * @return <code>true</code> if the method was invoked successfully |
| */ |
| private static boolean processListener(Object bean, String propertyName, |
| PropertyChangeListener listener, String methodName, String message) { |
| Method method = null; |
| Object[] parameters = null; |
| |
| try { |
| try { |
| method = bean.getClass().getMethod( |
| methodName, |
| new Class[] { String.class, |
| PropertyChangeListener.class }); |
| |
| parameters = new Object[] { propertyName, listener }; |
| } catch (NoSuchMethodException e) { |
| method = bean.getClass().getMethod(methodName, |
| new Class[] { PropertyChangeListener.class }); |
| |
| parameters = new Object[] { listener }; |
| } |
| } catch (SecurityException e) { |
| // ignore |
| } catch (NoSuchMethodException e) { |
| log(IStatus.WARNING, message + bean, e); |
| } |
| |
| if (method != null) { |
| if (!method.isAccessible()) { |
| method.setAccessible(true); |
| } |
| try { |
| method.invoke(bean, parameters); |
| return true; |
| } catch (IllegalArgumentException e) { |
| log(IStatus.WARNING, message + bean, e); |
| } catch (IllegalAccessException e) { |
| log(IStatus.WARNING, message + bean, e); |
| } catch (InvocationTargetException e) { |
| log(IStatus.WARNING, message + bean, e); |
| } |
| } |
| return false; |
| } |
| |
| /** |
| * Logs a message to the Data Binding logger. |
| */ |
| private static void log(int severity, String message, Throwable throwable) { |
| if (BeanProperties.DEBUG) { |
| Policy.getLog().log( |
| new Status(severity, Policy.JFACE_DATABINDING, IStatus.OK, |
| message, throwable)); |
| } |
| } |
| } |