Java tutorial
package org.marketcetera.photon.views; import java.math.BigDecimal; import java.util.HashMap; import java.util.Map; import org.apache.commons.lang.StringUtils; import org.eclipse.core.commands.AbstractHandler; import org.eclipse.core.commands.ExecutionEvent; import org.eclipse.core.commands.ExecutionException; import org.eclipse.core.commands.IHandler; import org.eclipse.core.databinding.beans.BeansObservables; import org.eclipse.core.databinding.observable.list.WritableList; import org.eclipse.core.databinding.observable.map.CompositeMap; import org.eclipse.core.databinding.observable.map.IObservableMap; import org.eclipse.core.databinding.observable.set.IObservableSet; import org.eclipse.core.runtime.AssertionFailedException; import org.eclipse.emf.databinding.EMFObservables; import org.eclipse.emf.ecore.EStructuralFeature; import org.eclipse.jface.action.IToolBarManager; import org.eclipse.jface.action.MenuManager; import org.eclipse.jface.databinding.viewers.ObservableListContentProvider; import org.eclipse.jface.databinding.viewers.ObservableMapLabelProvider; import org.eclipse.jface.layout.GridDataFactory; import org.eclipse.jface.viewers.*; import org.eclipse.swt.SWT; import org.eclipse.swt.custom.BusyIndicator; import org.eclipse.swt.dnd.Clipboard; import org.eclipse.swt.dnd.TextTransfer; import org.eclipse.swt.dnd.Transfer; import org.eclipse.swt.events.SelectionAdapter; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.events.SelectionListener; import org.eclipse.swt.widgets.*; import org.eclipse.ui.*; import org.eclipse.ui.handlers.HandlerUtil; import org.eclipse.ui.part.ViewPart; import org.marketcetera.photon.FIXFieldLocalizer; import org.marketcetera.photon.Messages; import org.marketcetera.photon.PhotonPlugin; import org.marketcetera.photon.commons.ui.workbench.ColumnState; import org.marketcetera.photon.commons.ui.workbench.ChooseColumnsMenu.IColumnProvider; import org.marketcetera.photon.marketdata.IMarketDataManager; import org.marketcetera.photon.model.marketdata.MDPackage; import org.marketcetera.photon.ui.TextContributionItem; import org.marketcetera.trade.Equity; import org.marketcetera.util.misc.ClassVersion; import quickfix.field.*; /* $License$ */ /** * Market data view. * * @author <a href="mailto:will@marketcetera.com">Will Horn</a> * @version $Id$ * @since 1.0.0 */ @ClassVersion("$Id$") public final class MarketDataView extends ViewPart implements IMSymbolListener, IColumnProvider, Messages { /** * The view ID. */ public static final String ID = "org.marketcetera.photon.views.MarketDataView"; //$NON-NLS-1$ private Map<Equity, MarketDataViewItem> mItemMap = new HashMap<Equity, MarketDataViewItem>(); private TextContributionItem mSymbolEntryText; private final IMarketDataManager mMarketDataManager = PhotonPlugin.getDefault().getMarketDataManager(); private TableViewer mViewer; private WritableList mItems; private IMemento mViewState; private Clipboard mClipboard; /** * Constructor. */ public MarketDataView() { } @Override public void init(IViewSite site, IMemento memento) throws PartInitException { super.init(site); mViewState = memento; } /** * Returns the clipboard for this view. * * @return the clipboard for this view */ public Clipboard getClipboard() { if (mClipboard == null) { mClipboard = new Clipboard(mViewer.getControl().getDisplay()); } return mClipboard; } @Override public Table getColumnWidget() { return mViewer != null ? mViewer.getTable() : null; } @Override public void createPartControl(Composite parent) { final IActionBars actionBars = getViewSite().getActionBars(); IToolBarManager toolbar = actionBars.getToolBarManager(); mSymbolEntryText = new TextContributionItem(""); //$NON-NLS-1$ toolbar.add(mSymbolEntryText); toolbar.add(new AddSymbolAction(mSymbolEntryText, this)); final Table table = new Table(parent, SWT.MULTI | SWT.FULL_SELECTION | SWT.V_SCROLL | SWT.BORDER); table.setHeaderVisible(true); mViewer = new TableViewer(table); GridDataFactory.defaultsFor(table).applyTo(table); final MarketDataItemComparator comparator = new MarketDataItemComparator(); mViewer.setComparator(comparator); SelectionListener listener = new SelectionAdapter() { @Override public void widgetSelected(SelectionEvent e) { // determine new sort column and direction TableColumn sortColumn = table.getSortColumn(); TableColumn currentColumn = (TableColumn) e.widget; final int index = table.indexOf(currentColumn); int dir = table.getSortDirection(); if (sortColumn == currentColumn) { dir = dir == SWT.UP ? SWT.DOWN : SWT.UP; } else { table.setSortColumn(currentColumn); dir = SWT.UP; } table.setSortDirection(dir); comparator.setSort(dir == SWT.UP ? 1 : -1); comparator.setIndex(index); mViewer.refresh(); } }; // create columns, using FIXFieldLocalizer to preserve backwards // compatibility TableViewerColumn symbolColumn = new TableViewerColumn(mViewer, createColumn(table, FIXFieldLocalizer.getLocalizedFIXFieldName(Symbol.class.getSimpleName()), SWT.LEFT, listener)); symbolColumn.setEditingSupport(new SymbolEditingSupport()); createColumn(table, FIXFieldLocalizer.getLocalizedFIXFieldName(LastPx.class.getSimpleName()), SWT.RIGHT, listener); createColumn(table, FIXFieldLocalizer.getLocalizedFIXFieldName(LastQty.class.getSimpleName()), SWT.RIGHT, listener); createColumn(table, FIXFieldLocalizer.getLocalizedFIXFieldName(BidSize.class.getSimpleName()), SWT.RIGHT, listener); createColumn(table, FIXFieldLocalizer.getLocalizedFIXFieldName(BidPx.class.getSimpleName()), SWT.RIGHT, listener); createColumn(table, FIXFieldLocalizer.getLocalizedFIXFieldName(OfferPx.class.getSimpleName()), SWT.RIGHT, listener); createColumn(table, FIXFieldLocalizer.getLocalizedFIXFieldName(OfferSize.class.getSimpleName()), SWT.RIGHT, listener); // restore table state if it exists if (mViewState != null) { ColumnState.restore(table, mViewState); for (TableColumn column : table.getColumns()) { if (column.getWidth() == 0) { column.setResizable(false); } } } registerContextMenu(); getSite().setSelectionProvider(mViewer); ObservableListContentProvider content = new ObservableListContentProvider(); mViewer.setContentProvider(content); IObservableSet domain = content.getKnownElements(); IObservableMap[] maps = new IObservableMap[] { BeansObservables.observeMap(domain, MarketDataViewItem.class, "symbol"), //$NON-NLS-1$ createCompositeMap(domain, "latestTick", MDPackage.Literals.MD_LATEST_TICK__PRICE), //$NON-NLS-1$ createCompositeMap(domain, "latestTick", MDPackage.Literals.MD_LATEST_TICK__SIZE), //$NON-NLS-1$ createCompositeMap(domain, "topOfBook", MDPackage.Literals.MD_TOP_OF_BOOK__BID_SIZE), //$NON-NLS-1$ createCompositeMap(domain, "topOfBook", MDPackage.Literals.MD_TOP_OF_BOOK__BID_PRICE), //$NON-NLS-1$ createCompositeMap(domain, "topOfBook", MDPackage.Literals.MD_TOP_OF_BOOK__ASK_PRICE), //$NON-NLS-1$ createCompositeMap(domain, "topOfBook", MDPackage.Literals.MD_TOP_OF_BOOK__ASK_SIZE) //$NON-NLS-1$ }; mViewer.setLabelProvider(new ObservableMapLabelProvider(maps)); mViewer.setUseHashlookup(true); mItems = WritableList.withElementType(MarketDataViewItem.class); mViewer.setInput(mItems); } private IObservableMap createCompositeMap(IObservableSet domain, String property, EStructuralFeature feature) { return new CompositeMap(BeansObservables.observeMap(domain, MarketDataViewItem.class, property), EMFObservables.mapFactory(feature)); } private TableColumn createColumn(final Table table, String text, int alignment, SelectionListener listener) { final TableColumn column = new TableColumn(table, SWT.NONE); column.setWidth(70); column.setText(text); column.setMoveable(true); column.setAlignment(alignment); column.addSelectionListener(listener); return column; } /** * Register the context menu for the viewer so that commands may be added to * it. */ private void registerContextMenu() { MenuManager contextMenu = new MenuManager(); contextMenu.setRemoveAllWhenShown(true); getSite().registerContextMenu(contextMenu, mViewer); Control control = mViewer.getControl(); Menu menu = contextMenu.createContextMenu(control); control.setMenu(menu); } @Override public void saveState(IMemento memento) { ColumnState.save(getColumnWidget(), memento); } @Override public void setFocus() { if (mSymbolEntryText.isEnabled()) mSymbolEntryText.setFocus(); } @Override public boolean isListeningSymbol(Equity symbol) { return false; } @Override public void onAssertSymbol(Equity symbol) { addSymbol(symbol); } /** * Adds a new row in the view for the given symbol (if one does not already * exist). * * @param symbol * symbol to add to view */ public void addSymbol(final Equity symbol) { if (mItemMap.containsKey(symbol)) { PhotonPlugin.getMainConsoleLogger().warn(DUPLICATE_SYMBOL.getText(symbol)); } else { busyRun(new Runnable() { @Override public void run() { MarketDataViewItem item = new MarketDataViewItem(mMarketDataManager.getMarketData(), symbol); mItemMap.put(symbol, item); mItems.add(item); } }); } } private void busyRun(Runnable runnable) { BusyIndicator.showWhile(getViewSite().getShell().getDisplay(), runnable); } private void remove(final MarketDataViewItem item) { mItemMap.remove(item.getEquity()); mItems.remove(item); item.dispose(); } @Override public void dispose() { for (MarketDataViewItem item : mItemMap.values()) { item.dispose(); } mItemMap = null; mItems = null; if (mClipboard != null) { mClipboard.dispose(); } super.dispose(); } /** * Handles column sorting. * * @author <a href="mailto:will@marketcetera.com">Will Horn</a> * @version $Id$ * @since 1.0.0 */ @ClassVersion("$Id$") //$NON-NLS-1$ private static class MarketDataItemComparator extends ViewerComparator { private int mIndex = -1; private int mDirection = 0; /** * @param index * index of sort column */ public void setIndex(int index) { mIndex = index; } /** * @param direction * sort direction, 1 for ascending and -1 for descending */ public void setSort(int direction) { mDirection = direction; } @Override public int compare(Viewer viewer, Object e1, Object e2) { if (mIndex == -1) return 0; MarketDataViewItem item1 = (MarketDataViewItem) e1; MarketDataViewItem item2 = (MarketDataViewItem) e2; int compare; switch (mIndex) { case 0: String symbol1 = item1.getEquity().getSymbol(); String symbol2 = item2.getEquity().getSymbol(); compare = compareNulls(symbol1, symbol2); if (compare == 0) { compare = symbol1.compareTo(symbol2); } break; case 1: BigDecimal tradePrice1 = item1.getLatestTick().getPrice(); BigDecimal tradePrice2 = item2.getLatestTick().getPrice(); compare = compareNulls(tradePrice1, tradePrice2); if (compare == 0) { compare = tradePrice1.compareTo(tradePrice2); } break; case 2: BigDecimal tradeSize1 = item1.getLatestTick().getSize(); BigDecimal tradeSize2 = item2.getLatestTick().getSize(); compare = compareNulls(tradeSize1, tradeSize2); if (compare == 0) { compare = tradeSize1.compareTo(tradeSize2); } break; case 3: BigDecimal bidSize1 = item1.getTopOfBook().getBidSize(); BigDecimal bidSize2 = item2.getTopOfBook().getBidSize(); compare = compareNulls(bidSize1, bidSize2); if (compare == 0) { compare = bidSize1.compareTo(bidSize2); } break; case 4: BigDecimal bidPrice1 = item1.getTopOfBook().getBidPrice(); BigDecimal bidPrice2 = item2.getTopOfBook().getBidPrice(); compare = compareNulls(bidPrice1, bidPrice2); if (compare == 0) { compare = bidPrice1.compareTo(bidPrice2); } break; case 5: BigDecimal askPrice1 = item1.getTopOfBook().getAskPrice(); BigDecimal askPrice2 = item2.getTopOfBook().getAskPrice(); compare = compareNulls(askPrice1, askPrice2); if (compare == 0) { compare = askPrice1.compareTo(askPrice2); } break; case 6: BigDecimal askSize1 = item1.getTopOfBook().getAskSize(); BigDecimal askSize2 = item2.getTopOfBook().getAskSize(); compare = compareNulls(askSize1, askSize2); if (compare == 0) { compare = askSize1.compareTo(askSize2); } break; default: throw new AssertionFailedException("Invalid column index"); //$NON-NLS-1$ } return mDirection * compare; } private int compareNulls(Object o1, Object o2) { if (o1 == null) { return (o2 == null) ? 0 : -1; } if (o2 == null) { return (o1 == null) ? 0 : 1; } return 0; } } /** * Provides support for editing symbols in-line * * @author <a href="mailto:will@marketcetera.com">Will Horn</a> * @version $Id$ * @since 1.0.0 */ @ClassVersion("$Id$") //$NON-NLS-1$ private final class SymbolEditingSupport extends EditingSupport { private final TextCellEditor mTextCellEditor; private SymbolEditingSupport() { super(mViewer); this.mTextCellEditor = new TextCellEditor(mViewer.getTable()); } @Override protected void setValue(Object element, Object value) { if (StringUtils.isBlank(value.toString())) return; final MarketDataViewItem item = (MarketDataViewItem) element; final Equity equity = item.getEquity(); if (equity.getSymbol().equals(value)) return; final Equity newEquity = new Equity(value.toString()); if (mItemMap.containsKey(newEquity)) { PhotonPlugin.getMainConsoleLogger().warn(DUPLICATE_SYMBOL.getText(newEquity.getSymbol())); return; } busyRun(new Runnable() { @Override public void run() { mItemMap.remove(equity); item.setEquity(newEquity); mItemMap.put(newEquity, item); } }); } @Override protected Object getValue(Object element) { return ((MarketDataViewItem) element).getEquity().getSymbol(); } @Override protected CellEditor getCellEditor(Object element) { return mTextCellEditor; } @Override protected boolean canEdit(Object element) { return true; } } /** * Handles the delete command for this view. * * @author <a href="mailto:will@marketcetera.com">Will Horn</a> * @version $Id$ * @since 1.0.0 */ @ClassVersion("$Id$") public static final class DeleteCommandHandler extends AbstractHandler implements IHandler { @Override public Object execute(ExecutionEvent event) throws ExecutionException { IWorkbenchPart part = HandlerUtil.getActivePartChecked(event); ISelection selection = HandlerUtil.getCurrentSelectionChecked(event); if (part instanceof MarketDataView && selection instanceof IStructuredSelection) { final MarketDataView view = (MarketDataView) part; final IStructuredSelection sselection = (IStructuredSelection) selection; // this can take some time view.busyRun(new Runnable() { public void run() { for (Object obj : sselection.toArray()) { if (obj instanceof MarketDataViewItem) { view.remove((MarketDataViewItem) obj); } } } }); } return null; } } /** * Handles the copy command for this view * * @author <a href="mailto:will@marketcetera.com">Will Horn</a> * @version $Id$ * @since 1.0.0 */ @ClassVersion("$Id$") //$NON-NLS-1$ public static final class CopyCommandHandler extends AbstractHandler implements IHandler { @Override public Object execute(ExecutionEvent event) throws ExecutionException { IWorkbenchPart part = HandlerUtil.getActivePartChecked(event); ISelection selection = HandlerUtil.getCurrentSelectionChecked(event); if (part instanceof MarketDataView && selection instanceof IStructuredSelection) { MarketDataView view = (MarketDataView) part; IStructuredSelection sselection = (IStructuredSelection) selection; StringBuilder builder = new StringBuilder(); for (Object obj : sselection.toArray()) { if (obj instanceof MarketDataViewItem) { MarketDataViewItem item = (MarketDataViewItem) obj; builder.append(item); builder.append(System.getProperty("line.separator")); //$NON-NLS-1$ } } view.getClipboard().setContents(new Object[] { builder.toString() }, new Transfer[] { TextTransfer.getInstance() }); } return null; } } }