Java tutorial
/********************************************************************************************* * Copyright (c) 2014-2015 Software Behaviour Analysis Lab, Concordia University, Montreal, Canada * * All rights reserved. This program and the accompanying materials * are made available under the terms of Eclipse Public License v1.0 License which * accompanies this distribution, and is available at http://www.eclipse.org/legal/epl-v10.html * * Contributors: * Syed Shariyar Murtaza -- Initial design and implementation **********************************************************************************************/ package org.eclipse.tracecompass.totalads.ui.models.delete; import java.util.HashSet; import java.util.Iterator; import java.util.logging.Level; import java.util.logging.Logger; import org.eclipse.core.commands.ExecutionEvent; import org.eclipse.core.commands.ExecutionException; import org.eclipse.core.commands.IHandler; import org.eclipse.core.commands.IHandlerListener; import org.eclipse.jface.dialogs.IDialogConstants; import org.eclipse.jface.dialogs.MessageDialog; import org.eclipse.jface.viewers.ISelection; import org.eclipse.tracecompass.totalads.dbms.DBMSFactory; import org.eclipse.tracecompass.totalads.ui.models.DataModelsView; import org.eclipse.swt.widgets.Display; import org.eclipse.tracecompass.totalads.ui.models.delete.DeleteModelHandler; import org.eclipse.tracecompass.totalads.ui.models.delete.Messages; import org.eclipse.ui.ISelectionListener; import org.eclipse.ui.IWorkbenchPart; import org.eclipse.ui.PlatformUI; /** * This class implements the delete command for an icon on the * {@link DataModelsView}). Its object is executed by Eclipse automatically * whenever the delete icon is clicked. * * @author <p> * Syed Shariyar Murtaza justsshary@hotmail.com * </p> * */ public class DeleteModelHandler implements IHandler { private HashSet<String> fSelectedModels; /** * Constructor */ @SuppressWarnings("unchecked") public DeleteModelHandler() { fSelectedModels = new HashSet<>(); // / Registers a listener to Eclipse to get the list of models selected // (checked) by the user PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage() .addSelectionListener(DataModelsView.VIEW_ID, new ISelectionListener() { @Override public void selectionChanged(IWorkbenchPart part, ISelection selection) { if (part instanceof DataModelsView) { Object obj = ((org.eclipse.jface.viewers.StructuredSelection) selection) .getFirstElement(); fSelectedModels = (HashSet<String>) obj; } } }); } /* * (non-Javadoc) * * @see * org.eclipse.core.commands.IHandler#addHandlerListener(org.eclipse.core * .commands.IHandlerListener) */ @Override public void addHandlerListener(IHandlerListener handlerListener) { } /* * (non-Javadoc) * * @see org.eclipse.core.commands.IHandler#dispose() */ @Override public void dispose() { } /* * This function deletes a model from the database (non-Javadoc) * * @see * org.eclipse.core.commands.IHandler#execute(org.eclipse.core.commands. * ExecutionEvent) */ @Override public Object execute(ExecutionEvent event) throws ExecutionException { String msgTitle = "TotalADS"; //$NON-NLS-1$ // MessageBox msgBoxYesNo = new MessageBox(PlatformUI.getWorkbench().getActiveWorkbenchWindow().getShell(), // SWT.ICON_INFORMATION | SWT.YES | SWT.NO); //msgBoxYesNo.setText(msgTitle); try { // checking if a model is selected if (fSelectedModels.size() <= 0) { MessageDialog.openError(PlatformUI.getWorkbench().getActiveWorkbenchWindow().getShell(), msgTitle, Messages.DeleteModelHandler_SelModel); return null; } // // Get confirmation // Iterator<String> it = fSelectedModels.iterator(); String message = Messages.DeleteModelHandler_WantToDel; int count = 1; while (it.hasNext()) { if (count == 1 && fSelectedModels.size() <= 2) { message += it.next() + " "; //$NON-NLS-1$ } else if (count == 1 && fSelectedModels.size() > 2) { message += it.next() + ", "; //$NON-NLS-1$ } else if (count > 1 && count < fSelectedModels.size()) { message += it.next() + ", "; //$NON-NLS-1$ } else if (count > 1 && count == fSelectedModels.size()) { message += Messages.DeleteModelHandler_And + it.next(); } count++; } message += "?"; //$NON-NLS-1$ MessageDialog msgBoxYesNo = new MessageDialog(Display.getDefault().getActiveShell(), msgTitle, null, message, MessageDialog.QUESTION, new String[] { IDialogConstants.NO_LABEL, IDialogConstants.YES_LABEL, }, 0); if (msgBoxYesNo.open() == 1) {//YES // Delete models now it = fSelectedModels.iterator(); while (it.hasNext()) { String err = DBMSFactory.INSTANCE.deleteDatabase(it.next()); if (!err.isEmpty()) { // if the database is not connected MessageDialog.openError( org.eclipse.ui.PlatformUI.getWorkbench().getActiveWorkbenchWindow().getShell(), msgTitle, err); break; } } } } catch (Exception ex) { if (ex.getMessage() != null) { MessageDialog.openError( org.eclipse.ui.PlatformUI.getWorkbench().getActiveWorkbenchWindow().getShell(), msgTitle, ex.getMessage()); } else { MessageDialog.openError( org.eclipse.ui.PlatformUI.getWorkbench().getActiveWorkbenchWindow().getShell(), msgTitle, Messages.DeleteModelHandler_ErrDel); } Logger.getLogger(DeleteModelHandler.class.getName()).log(Level.SEVERE, ex.getMessage(), ex); // Check if connection still exists and all the views are notified // of the presence and absence of connection DBMSFactory.INSTANCE.verifyConnection(); } return null; } /* * (non-Javadoc) * * @see org.eclipse.core.commands.IHandler#isEnabled() */ @Override public boolean isEnabled() { return true; } /* * (non-Javadoc) * * @see org.eclipse.core.commands.IHandler#isHandled() */ @Override public boolean isHandled() { return true; } /* * (non-Javadoc) * * @see * org.eclipse.core.commands.IHandler#removeHandlerListener(org.eclipse. * core.commands.IHandlerListener) */ @Override public void removeHandlerListener(IHandlerListener handlerListener) { } }