| /******************************************************************************* |
| * Copyright (c) 2017 EclipseSource Services GmbH 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: |
| * Martin Fleck - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.papyrus.compare.uml2.internal.hook.migration; |
| |
| import java.lang.reflect.InvocationHandler; |
| import java.lang.reflect.InvocationTargetException; |
| import java.lang.reflect.Method; |
| |
| import org.eclipse.core.runtime.IStatus; |
| import org.eclipse.core.runtime.Status; |
| import org.eclipse.papyrus.compare.uml2.internal.UMLPapyrusComparePlugin; |
| |
| /** |
| * An invocation handler that wraps a given object and delegates all method calls to this object. The |
| * underlying assumption therefore is that there is a 1:1 mapping between the methods of a proxy instance |
| * created with this handler and the object. Any errors occurring during method calls will be silently logged |
| * and the called proxy method will simply return null. |
| * |
| * @author Martin Fleck <mfleck@eclipsesource.com> |
| */ |
| public class DelegatingInvocationHandler implements InvocationHandler { |
| |
| /** Object handling the method calls. */ |
| private Object object; |
| |
| /** |
| * Creates a new invocation handler with the given object. Any calls made to a proxy instance created with |
| * this handler will be delegated to this object. If errors occur, they will be logged and the called proxy |
| * method will simply return null. |
| * |
| * @param object |
| * object handling the method calls |
| */ |
| public DelegatingInvocationHandler(Object object) { |
| this.object = object; |
| } |
| |
| // CHECKSTYLE:OFF - for Throwable |
| @Override |
| public Object invoke(Object proxy, Method method, Object[] args) throws Throwable { |
| // CHECKSTYLE:ON |
| if (object == null) { |
| return null; |
| } |
| try { |
| Method objectMethod = object.getClass().getDeclaredMethod(method.getName(), |
| method.getParameterTypes()); |
| return objectMethod.invoke(object, args); |
| } catch (NullPointerException | NoSuchMethodException | SecurityException | IllegalAccessException |
| | IllegalArgumentException | InvocationTargetException e) { |
| UMLPapyrusComparePlugin.getDefault().getLog() |
| .log(new Status(IStatus.WARNING, UMLPapyrusComparePlugin.PLUGIN_ID, |
| "Unable to invoke method '" + method.getName() //$NON-NLS-1$ |
| + "' on Object " + object, //$NON-NLS-1$ |
| e)); |
| } |
| return null; |
| } |
| } |