Java tutorial
/******************************************************************************* * Copyright (c) 2011 neXtep Software and contributors. * All rights reserved. * * This file is part of neXtep designer. * * NeXtep designer is free software: you can redistribute it * and/or modify it under the terms of the GNU General Public * License as published by the Free Software Foundation, either * version 3 of the License, or any later version. * * NeXtep designer is distributed in the hope that it will be * useful, but WITHOUT ANY WARRANTY; without even the implied * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. * See the GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with Foobar. If not, see <http://www.gnu.org/licenses/>. * * Contributors: * neXtep Softwares - initial API and implementation *******************************************************************************/ /** * */ package com.nextep.designer.vcs.ui.impl; import java.lang.reflect.InvocationTargetException; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.eclipse.jface.dialogs.MessageDialog; import org.eclipse.swt.widgets.Display; import org.eclipse.ui.IWorkbenchPage; import org.eclipse.ui.PlatformUI; import org.hibernate.HibernateException; import org.hibernate.exception.JDBCConnectionException; import com.nextep.datadesigner.Designer; import com.nextep.datadesigner.exception.CancelException; import com.nextep.datadesigner.exception.ErrorException; import com.nextep.datadesigner.exception.ExitDesignerException; import com.nextep.datadesigner.exception.OutOfDateObjectException; import com.nextep.datadesigner.hibernate.HibernateUtil; import com.nextep.designer.ui.UIMessages; import com.nextep.designer.vcs.VCSPlugin; import com.nextep.designer.vcs.services.IWorkspaceService; import com.nextep.designer.vcs.ui.VCSUIPlugin; import com.nextep.designer.vcs.ui.services.IWorkspaceUIService; import com.nextep.designer.vcs.ui.services.VersionUIHelper; /** * All thrown exceptions should be redirected to this handler which will either log a message in the * console or raise a runtime exception. * * @author Christophe Fondacci */ public class ExceptionHandler { private static final Log log = LogFactory.getLog(ExceptionHandler.class); /** * Handles exception within the neXtep designer environment. This method returns a boolean * indicating whether the exception handling should go on with Eclipse exception handling or if * it has been absorbed by neXtep. * * @param t the exception to handle * @return <code>true</code> when the exception has been completely handled and should not be * raised, else <code>false</code>. */ public static boolean handle(Throwable t) { if (t instanceof OutOfDateObjectException) { VersionUIHelper.promptObjectSynched(((OutOfDateObjectException) t).getStaleObject()); } else if (t instanceof CancelException) { log.info(t.getMessage()); } else if (t instanceof ErrorException) { if (t.getCause() instanceof InvocationTargetException) { t = t.getCause().getCause(); return handle(t); } log.error(t.getMessage(), t); MessageDialog.openWarning(PlatformUI.getWorkbench().getActiveWorkbenchWindow().getShell(), "Error when performing user action", t.getMessage()); // if("true".equals(Designer.getInstance().getProperty("nextep.designer.debug"))) { // log.error(t); // } } else if (t instanceof ExitDesignerException) { log.info(t.getMessage()); } else if (t instanceof JDBCConnectionException) { if (!Designer.getTerminationSignal()) { Designer.setTerminationSignal(true); try { // Ensuring a UI Thread Display.getDefault().syncExec(new Runnable() { @Override public void run() { // We are in a situation where we've lost our connection to the // repository MessageDialog.openError(null, UIMessages.getString("exceptionHandler.repositoryConnectionLost.title"), //$NON-NLS-1$ UIMessages.getString("exceptionHandler.repositoryConnectionLost.message")); //$NON-NLS-1$ // Closing perpective IWorkbenchPage page = PlatformUI.getWorkbench().getActiveWorkbenchWindow() .getActivePage(); page.closeAllPerspectives(true, true); // Closing and reopening session HibernateUtil.getInstance().reconnectAll(); // Changing view final IWorkspaceUIService viewUiService = VCSUIPlugin .getService(IWorkspaceUIService.class); final IWorkspaceService viewService = VCSPlugin.getService(IWorkspaceService.class); viewUiService.changeWorkspace(viewService.getCurrentWorkspace().getUID()); } }); } finally { Designer.setTerminationSignal(false); } } else { log.error("Error thrown while reinitializing repository connection: " + t.getMessage(), t); } return true; } else { log.error("An error has been raised: " + t.getMessage(), t); //$NON-NLS-1$ if (t instanceof HibernateException && PlatformUI.getWorkbench() != null && PlatformUI.getWorkbench().getActiveWorkbenchWindow() != null) { MessageDialog.openError(PlatformUI.getWorkbench().getActiveWorkbenchWindow().getShell(), UIMessages.getString("systemInstableTitle"), UIMessages //$NON-NLS-1$ .getString("systemInstable")); //$NON-NLS-1$ } } if (Designer.isDebugging()) { t.printStackTrace(); } // By default we consider that we haven't handled completely the problem return false; } }