Java tutorial
/* * Copyright (c) 2008 Stiftung Deutsches Elektronen-Synchrotron, * Member of the Helmholtz Association, (DESY), HAMBURG, GERMANY. * * THIS SOFTWARE IS PROVIDED UNDER THIS LICENSE ON AN "../AS IS" BASIS. * WITHOUT WARRANTY OF ANY KIND, EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED * TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR PARTICULAR PURPOSE AND * NON-INFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE * FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR * THE USE OR OTHER DEALINGS IN THE SOFTWARE. SHOULD THE SOFTWARE PROVE DEFECTIVE * IN ANY RESPECT, THE USER ASSUMES THE COST OF ANY NECESSARY SERVICING, REPAIR OR * CORRECTION. THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL PART OF THIS LICENSE. * NO USE OF ANY SOFTWARE IS AUTHORIZED HEREUNDER EXCEPT UNDER THIS DISCLAIMER. * DESY HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, * OR MODIFICATIONS. * THE FULL LICENSE SPECIFYING FOR THE SOFTWARE THE REDISTRIBUTION, MODIFICATION, * USAGE AND OTHER RIGHTS AND OBLIGATIONS IS INCLUDED WITH THE DISTRIBUTION OF THIS * PROJECT IN THE FILE LICENSE.HTML. IF THE LICENSE IS NOT INCLUDED YOU MAY FIND A COPY * AT HTTP://WWW.DESY.DE/LEGAL/LICENSE.HTM */ package org.csstudio.dal.ui.internal.connectionview; import java.util.ArrayList; import java.util.Collections; import java.util.HashSet; import java.util.Iterator; import java.util.List; import java.util.Set; import org.csstudio.dal.ui.dnd.rfc.ProcessVariableExchangeUtil; import org.csstudio.dal.ui.util.LayoutUtil; import org.csstudio.platform.model.pvs.IProcessVariableAddress; import org.csstudio.platform.model.pvs.IProcessVariableAdressProvider; import org.csstudio.platform.simpledal.ConnectionState; import org.csstudio.platform.simpledal.IConnector; import org.csstudio.platform.simpledal.IProcessVariableConnectionService; import org.csstudio.platform.simpledal.ProcessVariableConnectionServiceFactory; import org.eclipse.core.runtime.IProgressMonitor; import org.eclipse.core.runtime.IStatus; import org.eclipse.core.runtime.Status; import org.eclipse.jface.action.GroupMarker; import org.eclipse.jface.action.MenuManager; import org.eclipse.jface.viewers.ColumnViewerToolTipSupport; import org.eclipse.jface.viewers.IStructuredContentProvider; import org.eclipse.jface.viewers.IStructuredSelection; import org.eclipse.jface.viewers.TableViewer; import org.eclipse.jface.viewers.TableViewerColumn; import org.eclipse.jface.viewers.Viewer; import org.eclipse.jface.viewers.ViewerComparator; import org.eclipse.jface.viewers.ViewerFilter; import org.eclipse.jface.window.ToolTip; import org.eclipse.swt.SWT; import org.eclipse.swt.dnd.DND; import org.eclipse.swt.events.MouseAdapter; import org.eclipse.swt.events.MouseEvent; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.events.SelectionListener; import org.eclipse.swt.layout.FillLayout; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Table; import org.eclipse.ui.IWorkbenchActionConstants; import org.eclipse.ui.part.ViewPart; import org.eclipse.ui.progress.UIJob; /** * A view that displays the state of all channel connections that were opened * using the {@link IProcessVariableConnectionService} that has been created via * {@link ProcessVariableConnectionServiceFactory#getDefault()}. * * @author Sven Wende * */ public final class ConnectionStateView extends ViewPart { /** * The views ID. */ public static final String VIEW_ID = "org.csstudio.platform.ui.ConnectionStateView"; /** * The viewer. */ private TableViewer _viewer; /** * A UI job used to refresh the view at a fixed delay. */ private UIJob _updateJob; private SortDirection _sortDirection = SortDirection.BY_NAME; class FilterByConnectionStateMouseListener extends MouseAdapter { private final Set<ConnectionState> _connectionStates; public FilterByConnectionStateMouseListener(final Set<ConnectionState> connectionStates) { assert connectionStates != null; _connectionStates = connectionStates; } /** * {@inheritDoc} */ @Override public void mouseUp(final MouseEvent e) { final ViewerFilter filter = new ViewerFilter() { @Override public boolean select(final Viewer viewer, final Object parentElement, final Object element) { final IConnector s = (IConnector) element; return _connectionStates.contains(s.getLatestConnectionState()); } }; _viewer.setFilters(new ViewerFilter[] { filter }); } } // private Button createFilterButton(Composite parent, String label, // ConnectionState... connectionStates) { // // Button button = new Button(parent, SWT.NONE); // button.setText(label); // button // .addMouseListener(new FilterByConnectionStateMouseListener( // states)); // // return button; // } class FilterButton { private final Button _swtButton; private final Set<ConnectionState> _connectionStates; private final String _baseLabel; public FilterButton(final Composite parent, final int style, final String label, final ConnectionState... connectionStates) { _swtButton = new Button(parent, style); assert connectionStates != null; assert label != null; // remember label _baseLabel = label; // remember connection states _connectionStates = new HashSet<ConnectionState>(); for (final ConnectionState s : connectionStates) { _connectionStates.add(s); } // add action listener _swtButton.addMouseListener(new FilterByConnectionStateMouseListener(_connectionStates)); // initialize label refreshLabel(Collections.EMPTY_LIST); } public void refreshLabel(final List<IConnector> statistics) { assert statistics != null; int count = 0; if (statistics != null) { for (final IConnector s : statistics) { if (_connectionStates.contains(s.getLatestConnectionState())) { count++; } } } _swtButton.setText(_baseLabel + " (" + count + ")"); } } /** * {@inheritDoc} */ @Override public void createPartControl(final Composite parent) { // layout parent.setLayout(new GridLayout()); // create button panel final Composite buttons = new Composite(parent, SWT.NONE); buttons.setLayout(new FillLayout()); buttons.setLayoutData(LayoutUtil.createGridDataForHorizontalFillingCell()); final FilterButton buttonAll = new FilterButton(buttons, SWT.FLAT, "all", ConnectionState.values()); final FilterButton buttonConnected = new FilterButton(buttons, SWT.FLAT, "connected", ConnectionState.CONNECTED); final FilterButton buttonNotConnected = new FilterButton(buttons, SWT.FLAT, "not connected", ConnectionState.CONNECTION_LOST, ConnectionState.INITIAL, ConnectionState.CONNECTION_FAILED, ConnectionState.DISCONNECTED, ConnectionState.UNKNOWN); // create the viewer and ... _viewer = createChannelTable(parent); // .. initialize layout _viewer.getControl().setLayoutData(LayoutUtil.createGridDataForFillingCell()); // .. initialize content provider _viewer.setContentProvider(new IStructuredContentProvider() { /** * {@inheritDoc} */ @Override public void inputChanged(final Viewer viewer, final Object oldInput, final Object newInput) { } /** * {@inheritDoc} */ @Override public Object[] getElements(final Object parent) { final List<IConnector> statistics = ((IProcessVariableConnectionService) parent).getConnectors(); // refresh the filter button states buttonAll.refreshLabel(statistics); buttonConnected.refreshLabel(statistics); buttonNotConnected.refreshLabel(statistics); return statistics.toArray(); } /** * {@inheritDoc} */ @Override public void dispose() { } }); // ... initialize label provider _viewer.setLabelProvider(new LabelProvider()); _viewer.setInput( ProcessVariableConnectionServiceFactory.getDefault().getProcessVariableConnectionService()); // ... initialize comparators (important for sorting) _viewer.setComparator(new ViewerComparator() { @Override public int compare(final Viewer viewer, final Object e1, final Object e2) { return _sortDirection.getComparator().compare((IConnector) e1, (IConnector) e2); } }); // ... initialize tooltip support ColumnViewerToolTipSupport.enableFor(_viewer, ToolTip.NO_RECREATE); // ... initialize context menu final MenuManager menuManager = new MenuManager(); // menuManager.addMenuListener(new IMenuListener() { // // public void menuAboutToShow(final IMenuManager manager) { // manager.add(new GroupMarker( // IWorkbenchActionConstants.MB_ADDITIONS)); // } // }); menuManager.add(new GroupMarker(IWorkbenchActionConstants.MB_ADDITIONS)); _viewer.getControl().setMenu(menuManager.createContextMenu(_viewer.getControl())); getViewSite().registerContextMenu(menuManager, _viewer); getViewSite().setSelectionProvider(_viewer); // initialize the update job _updateJob = new UIJob("Update Connector State View") { @Override public IStatus runInUIThread(final IProgressMonitor monitor) { _viewer.refresh(); if (!monitor.isCanceled()) { _updateJob.schedule(2000); return Status.OK_STATUS; } else { return Status.CANCEL_STATUS; } } }; _updateJob.schedule(5000); } /** * {@inheritDoc} */ @Override public void dispose() { _updateJob.cancel(); super.dispose(); } /** * {@inheritDoc} */ @Override public void setFocus() { } private TableViewer createChannelTable(final Composite parent) { // define column names final String[] columnNames = new String[] { "PROP_DESCRIPTION", "PROP_NAME", "PROP_VALUE" }; //$NON-NLS-1$ //$NON-NLS-2$ // create table final Table table = new Table(parent, SWT.FULL_SELECTION | SWT.MULTI | SWT.HIDE_SELECTION | SWT.DOUBLE_BUFFERED | SWT.SCROLL_PAGE); table.setLinesVisible(true); table.setLayoutData(LayoutUtil.createGridDataForFillingCell()); table.setHeaderVisible(true); // create viewer final TableViewer viewer = new TableViewer(table); TableViewerColumn tvColumn; tvColumn = new TableViewerColumn(viewer, SWT.NONE); tvColumn.getColumn().setText("Channel"); tvColumn.getColumn().setMoveable(false); tvColumn.getColumn().setWidth(300); tvColumn = new TableViewerColumn(viewer, SWT.NONE); tvColumn.getColumn().setText("Connection State"); tvColumn.getColumn().setMoveable(false); tvColumn.getColumn().setWidth(200); tvColumn = new TableViewerColumn(viewer, SWT.NONE); tvColumn.getColumn().setText("Latest Value"); tvColumn.getColumn().setMoveable(false); tvColumn.getColumn().setWidth(200); viewer.setUseHashlookup(true); // define column properties viewer.setColumnProperties(columnNames); // DnD ProcessVariableExchangeUtil.addProcessVariableAdressDragSupport(viewer.getControl(), DND.DROP_MOVE | DND.DROP_COPY, new IProcessVariableAdressProvider() { @Override public List<IProcessVariableAddress> getProcessVariableAdresses() { final List<IProcessVariableAddress> result = new ArrayList<IProcessVariableAddress>(); final IStructuredSelection sel = (IStructuredSelection) viewer.getSelection(); final Iterator<IProcessVariableAdressProvider> it = sel.iterator(); while (it.hasNext()) { result.add(it.next().getPVAdress()); } return result; } @Override public IProcessVariableAddress getPVAdress() { final IStructuredSelection sel = (IStructuredSelection) viewer.getSelection(); final IProcessVariableAdressProvider pvProvider = (IProcessVariableAdressProvider) sel .getFirstElement(); return pvProvider != null ? pvProvider.getPVAdress() : null; } }); return viewer; } class ChangeSortDirectionListener implements SelectionListener { private final SortDirection _sortDirection; public ChangeSortDirectionListener(final SortDirection sortDirection) { assert sortDirection != null; _sortDirection = sortDirection; } @Override public void widgetDefaultSelected(final SelectionEvent e) { } @Override public void widgetSelected(final SelectionEvent e) { ConnectionStateView.this._sortDirection = this._sortDirection; } } }