Java tutorial
/******************************************************************************* * Copyright (c) 2015 Pivotal Software, Inc. * 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: * Pivotal Software, Inc. - initial API and implementation *******************************************************************************/ package org.springframework.ide.eclipse.boot.dash.ngrok; import java.util.ArrayList; import java.util.Collection; import java.util.Iterator; import java.util.List; import org.eclipse.core.runtime.ListenerList; import org.eclipse.jface.dialogs.IDialogSettings; import org.eclipse.jface.viewers.CheckStateChangedEvent; import org.eclipse.jface.viewers.CheckboxTableViewer; import org.eclipse.jface.viewers.DoubleClickEvent; import org.eclipse.jface.viewers.ICheckStateListener; import org.eclipse.jface.viewers.IDoubleClickListener; import org.eclipse.jface.viewers.ISelection; import org.eclipse.jface.viewers.ISelectionChangedListener; import org.eclipse.jface.viewers.ISelectionProvider; import org.eclipse.jface.viewers.IStructuredContentProvider; import org.eclipse.jface.viewers.IStructuredSelection; import org.eclipse.jface.viewers.ITableLabelProvider; import org.eclipse.jface.viewers.LabelProvider; import org.eclipse.jface.viewers.SelectionChangedEvent; import org.eclipse.jface.viewers.StructuredSelection; import org.eclipse.jface.viewers.Viewer; import org.eclipse.jface.viewers.ViewerComparator; import org.eclipse.swt.SWT; import org.eclipse.swt.events.KeyAdapter; import org.eclipse.swt.events.KeyEvent; import org.eclipse.swt.events.SelectionAdapter; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.graphics.Font; import org.eclipse.swt.graphics.Image; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Control; import org.eclipse.swt.widgets.Event; import org.eclipse.swt.widgets.FileDialog; import org.eclipse.swt.widgets.Listener; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Table; import org.eclipse.swt.widgets.TableColumn; import org.springframework.ide.eclipse.boot.core.BootActivator; import org.springframework.ide.eclipse.boot.util.SWTFactory; /** * @author Christian Dupuis * @author Steffen Pingel * @author Kris De Volder */ public class NGROKInstallBlock implements ISelectionProvider { private static final int defaultColumnWidth = 350; class NGROKContentProvider implements IStructuredContentProvider { public void dispose() { } public Object[] getElements(Object input) { return ngroks.toArray(); } public void inputChanged(Viewer viewer, Object oldInput, Object newInput) { } } class NGROKLabelProvider extends LabelProvider implements ITableLabelProvider { public Image getColumnImage(Object element, int columnIndex) { return null; } public String getColumnText(Object element, int columnIndex) { return element.toString(); } } private Composite control; private final List<String> ngroks = new ArrayList<String>(); private CheckboxTableViewer ngrokList; private Button addButton; private Button removeButton; private Button editButton; private final ListenerList selectionListeners = new ListenerList(); private ISelection prevSelection = new StructuredSelection(); private Table table; private NGROKInstallManager installManager; public NGROKInstallBlock(NGROKInstallManager installManager) { this.installManager = installManager; } public void addSelectionChangedListener(ISelectionChangedListener listener) { selectionListeners.add(listener); } public void createControl(Composite ancestor) { Font font = ancestor.getFont(); Composite parent = SWTFactory.createComposite(ancestor, font, 2, 1, GridData.FILL_BOTH); control = parent; SWTFactory.createLabel(parent, "ngrok Installations:", 2); table = new Table(parent, SWT.CHECK | SWT.BORDER | SWT.MULTI | SWT.FULL_SELECTION); GridData gd = new GridData(GridData.FILL_BOTH); gd.heightHint = 250; gd.widthHint = 350; table.setLayoutData(gd); table.setFont(font); table.setHeaderVisible(true); table.setLinesVisible(true); TableColumn column = new TableColumn(table, SWT.NULL); column.setText("Location"); column.addSelectionListener(new SelectionAdapter() { @Override public void widgetSelected(SelectionEvent e) { sortByLocation(); } }); ngrokList = new CheckboxTableViewer(table); ngrokList.setLabelProvider(new NGROKLabelProvider()); ngrokList.setContentProvider(new NGROKContentProvider()); // by default, sort by name sortByLocation(); ngrokList.addSelectionChangedListener(new ISelectionChangedListener() { public void selectionChanged(SelectionChangedEvent evt) { enableButtons(); } }); ngrokList.addCheckStateListener(new ICheckStateListener() { public void checkStateChanged(CheckStateChangedEvent event) { if (event.getChecked()) { setCheckedNGROK((String) event.getElement()); } else { setCheckedNGROK(null); } } }); ngrokList.addDoubleClickListener(new IDoubleClickListener() { public void doubleClick(DoubleClickEvent e) { if (!ngrokList.getSelection().isEmpty()) { editNGROK(); } } }); table.addKeyListener(new KeyAdapter() { @Override public void keyPressed(KeyEvent event) { if (event.character == SWT.DEL && event.stateMask == 0) { if (removeButton.isEnabled()) { removeNGROKs(); } } } }); Composite buttons = SWTFactory.createComposite(parent, font, 1, 1, GridData.VERTICAL_ALIGN_BEGINNING, 0, 0); addButton = SWTFactory.createPushButton(buttons, "Add...", null); addButton.addListener(SWT.Selection, new Listener() { public void handleEvent(Event evt) { addNGROK(); } }); editButton = SWTFactory.createPushButton(buttons, "Edit...", null); editButton.addListener(SWT.Selection, new Listener() { public void handleEvent(Event evt) { editNGROK(); } }); removeButton = SWTFactory.createPushButton(buttons, "Remove...", null); removeButton.addListener(SWT.Selection, new Listener() { public void handleEvent(Event evt) { removeNGROKs(); } }); SWTFactory.createVerticalSpacer(parent, 1); fillWithWorkspaceNGROKs(); enableButtons(); addButton.setEnabled(true); } public String getCheckedNGROK() { Object[] objects = ngrokList.getCheckedElements(); if (objects.length == 0) { return null; } return (String) objects[0]; } public Control getControl() { return control; } public String[] getNGROKs() { return ngroks.toArray(new String[ngroks.size()]); } public ISelection getSelection() { return new StructuredSelection(ngrokList.getCheckedElements()); } public boolean isDuplicateName(String name) { for (int i = 0; i < ngroks.size(); i++) { String ngrok = ngroks.get(i); if (ngrok.equals(name)) { return true; } } return false; } public void removeNGROKs(String[] ngroksToBeRemoved) { IStructuredSelection prev = (IStructuredSelection) getSelection(); for (String ngrok : ngroksToBeRemoved) { ngroks.remove(ngrok); } ngrokList.refresh(); IStructuredSelection curr = (IStructuredSelection) getSelection(); if (!curr.equals(prev)) { String[] installs = getNGROKs(); if (curr.size() == 0 && installs.length == 1) { setSelection(new StructuredSelection(installs[0])); } else { fireSelectionChanged(); } } } public void removeSelectionChangedListener(ISelectionChangedListener listener) { selectionListeners.remove(listener); } public void restoreColumnSettings(IDialogSettings settings, String qualifier) { ngrokList.getTable().layout(true); restoreColumnWidths(settings, qualifier); } public void saveColumnSettings(IDialogSettings settings, String qualifier) { int columnCount = table.getColumnCount(); for (int i = 0; i < columnCount; i++) { settings.put(qualifier + ".columnWidth" + i, table.getColumn(i).getWidth()); //$NON-NLS-1$ } } public void setCheckedNGROK(String vm) { if (vm == null) { setSelection(new StructuredSelection()); } else { setSelection(new StructuredSelection(vm)); } } public void setSelection(ISelection selection) { if (selection instanceof IStructuredSelection) { if (!selection.equals(prevSelection)) { prevSelection = selection; Object ngrok = ((IStructuredSelection) selection).getFirstElement(); if (ngrok == null) { ngrokList.setCheckedElements(new Object[0]); } else { ngrokList.setCheckedElements(new Object[] { ngrok }); ngrokList.reveal(ngrok); } fireSelectionChanged(); } } } public void ngrokAdded(String ngrok) { ngroks.add(ngrok); ngrokList.refresh(); } private void addNGROK() { try { FileDialog fileDialog = new FileDialog(control.getShell()); fileDialog.setText("select ngrok executable"); String result = fileDialog.open(); if (result != null) { ngroks.add(result); ngrokList.refresh(); ngrokList.setSelection(new StructuredSelection(result)); setSelection(new StructuredSelection(result)); } } catch (Exception e) { BootActivator.log(e); } } private void editNGROK() { IStructuredSelection selection = (IStructuredSelection) ngrokList.getSelection(); String ngrok = (String) selection.getFirstElement(); if (ngrok == null) { return; } FileDialog fileDialog = new FileDialog(control.getShell()); fileDialog.setText("select ngrok executable"); fileDialog.setFileName(ngrok); String result = fileDialog.open(); if (result != null) { // replace with the edited VM int index = ngroks.indexOf(ngrok); ngroks.remove(index); ngroks.add(index, result); ngrokList.refresh(); ngrokList.setSelection(new StructuredSelection(result)); } } private void enableButtons() { IStructuredSelection selection = (IStructuredSelection) ngrokList.getSelection(); int selectionCount = selection.size(); editButton.setEnabled(selectionCount == 1); if (selectionCount > 0 && selectionCount < ngrokList.getTable().getItemCount()) { removeButton.setEnabled(true); } else { removeButton.setEnabled(false); } } private void fireSelectionChanged() { SelectionChangedEvent event = new SelectionChangedEvent(this, getSelection()); Object[] listeners = selectionListeners.getListeners(); for (Object listener2 : listeners) { ISelectionChangedListener listener = (ISelectionChangedListener) listener2; listener.selectionChanged(event); } } private void removeNGROKs() { IStructuredSelection selection = (IStructuredSelection) ngrokList.getSelection(); String[] ngroks = new String[selection.size()]; Iterator<String> iter = selection.iterator(); int i = 0; while (iter.hasNext()) { ngroks[i] = iter.next(); i++; } removeNGROKs(ngroks); } private void restoreColumnWidths(IDialogSettings settings, String qualifier) { int columnCount = table.getColumnCount(); for (int i = 0; i < columnCount; i++) { int width = -1; try { width = settings.getInt(qualifier + ".columnWidth" + i); //$NON-NLS-1$ } catch (NumberFormatException e) { } if (width <= 0) { table.getColumn(i).setWidth(defaultColumnWidth); } else { table.getColumn(i).setWidth(width); } } } private void sortByLocation() { ngrokList.setComparator(new ViewerComparator() { @Override public int compare(Viewer viewer, Object e1, Object e2) { if ((e1 instanceof String) && (e2 instanceof String)) { String left = (String) e1; String right = (String) e2; return left.compareToIgnoreCase(right); } return super.compare(viewer, e1, e2); } @Override public boolean isSorterProperty(Object element, String property) { return true; } }); } protected void fillWithWorkspaceNGROKs() { Collection<String> installs = installManager.getInstalls(); String deflt = null; try { deflt = installManager.getDefaultInstall(); } catch (Exception e) { BootActivator.log(e); } setNGROKs(installs.toArray(new String[installs.size()]), deflt); } protected Shell getShell() { return getControl().getShell(); } protected void setNGROKs(String[] newNgroks, String dflt) { ngroks.clear(); for (String ngrok : newNgroks) { ngroks.add(ngrok); } ngrokList.setInput(ngroks); ngrokList.refresh(); for (String ngrok : newNgroks) { if (ngrok.equals(dflt)) { setCheckedNGROK(ngrok); } } } }