[news.eclipse.helpwanted] Problems with Table in RCP

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[news.eclipse.helpwanted] Problems with Table in RCP

From: Jan-Paul Nachtwey <jp.nachtwey@xxxxxx>
Date: Wed, 27 Jul 2005 22:45:01 +0200
Newsgroups: eclipse.platform.rcp, eclipse.helpwanted
Organization: EclipseCorner
User-agent: Mozilla Thunderbird 1.0 (Windows/20041206)

Hi,

I have a problem with the columns of a table. I wrote an RCP-Application and get a NullPointerException when closing this Application. Here is the Code I wrote, followed by the Stacktrace of the Exception:


public class PartDetailsPage implements IDetailsPage {

    String[] units = UnitLoader.getInstance().getUnitsAsString();

protected static final Logger log = Logger.getLogger(PartDetailsPage.class);

    class PartsContentProvider implements IStructuredContentProvider {

        protected final Logger log = Logger
                .getLogger(PartsContentProvider.class);

public Object[] getElements(Object inputElement) { if (inputElement instanceof Part) { Part part = (Part)inputElement; Object[] returnObjectArray = part.getIngredients().toArray(); return returnObjectArray; }

            log.error("getElements returns with null!");

            return new Object[0];
        }

        public void dispose() {
        }

public void inputChanged(Viewer viewer, Object oldInput, Object newInput) { viewer.refresh(); } }

class PartsLabelProvider extends LabelProvider implements ITableLabelProvider {

protected final Logger log = Logger.getLogger(PartsLabelProvider.class);

        public Image getColumnImage(Object element, int columnIndex) {

            Image returnImage = null;

switch (columnIndex) { case 0: returnImage = returnImage = CorePlugin.getDefault().getImage( CorePlugin.IMG_FOOD); break; } return returnImage; }

        public String getColumnText(Object element, int columnIndex) {
            if (!(element instanceof Ingredient)) return "";
            Ingredient ing = (Ingredient)element;

            String returnString = "";

switch (columnIndex) { case 0: returnString = ing.getAmount(); break; case 1: returnString = ing.getUnit().getId(); break; case 2: returnString = ing.getFood().getFood().toString(ing.getAmount()); } return returnString; }

    class IngredientCellModifier implements ICellModifier {

public boolean canModify(Object element, String property) { if (element instanceof Ingredient) { int index = Arrays.asList(ingredientViewer.getColumnProperties()) .indexOf(property); switch (index) { case 0: return true; case 1: return true; case 2: return false; } } if (element instanceof String) return true;

            return false;
        }

public Object getValue(Object element, String property) { if (element instanceof Ingredient) { Ingredient ing = (Ingredient) element; int index = Arrays.asList(ingredientViewer.getColumnProperties()) .indexOf(property); switch (index) { case 0: return ing.getAmount(); case 1: for (int i =0; i<units.length; i++ ) { if (units[i].equals(ing.getUnit().getId())) return new Integer(i); } return new Integer(0); case 2: return ing.getFood().getFood().toString(ing.getAmount()); } } return null; }

public void modify(Object element, String property, Object value) { Ingredient ing = (Ingredient) ((TableItem) element) .getData(); int index = Arrays.asList(ingredientViewer.getColumnProperties()) .indexOf(property); SimpleDateFormat sdf = new SimpleDateFormat(Messages .getString("dateFormat")); //$NON-NLS-1$ switch (index) { case 0: ing.setAmount(value.toString()); break; case 1:

ing.setUnit(UnitLoader.getInstance().loadUnit(units[((Integer)value).intValue()]));
                break;
            case 2: break;
            }
            ingredientViewer.refresh(true);
        }
    }

    private IManagedForm mform;
    private Part input;
    private TableViewer ingredientViewer;
    private Text steps;

    public PartDetailsPage() {
        super();
    }

    public void createContents(final Composite parent) {
        GridLayout layout = new GridLayout(2, false);
	layout.marginHeight = 5;
	layout.marginWidth = 5;
	parent.setLayout(layout);

FormToolkit toolkit = mform.getToolkit(); final Section s1 = toolkit.createSection(parent, Section.EXPANDED | Section.COMPACT | Section.TWISTIE); s1.marginWidth = 10; s1.marginHeight = 10; s1.setText("Ingredients"); s1.setDescription("Insert all the properties for one part of the recipe"); s1.addExpansionListener(new IExpansionListener() { public void expansionStateChanging(ExpansionEvent e) { }

public void expansionStateChanged(ExpansionEvent e) { if (!(s1.isExpanded())) { parent.pack(); } } }); GridData gd = new GridData(GridData.FILL_BOTH); s1.setLayoutData(gd); toolkit.createCompositeSeparator(s1); Composite client = toolkit.createComposite(s1); GridLayout glayout = new GridLayout(2,false); glayout.marginWidth = glayout.marginHeight = 5; glayout.verticalSpacing=5; glayout.numColumns = 2; client.setLayout(glayout); Table t = toolkit.createTable(client,SWT.SINGLE | SWT.FULL_SELECTION); gd = new GridData(GridData.FILL_BOTH); gd.horizontalIndent=2; gd.heightHint = 20; gd.widthHint = 100; t.setLayoutData(gd); t.setHeaderVisible(true); t.setLinesVisible(true); Button b = toolkit.createButton(client, Messages.getString("PartsBlock.add"), SWT.PUSH); //$NON-NLS-1$ gd = new GridData(GridData.VERTICAL_ALIGN_BEGINNING); b.setLayoutData(gd); TableColumn amountTc = new TableColumn(t, SWT.RIGHT, 0); amountTc.setText(Messages.getString("PartDetails.amount")); //$NON-NLS-1$ amountTc.setWidth(50); TableColumn unitTc = new TableColumn(t, SWT.LEFT, 1); unitTc.setText(Messages.getString("PartDetails.unit")); //$NON-NLS-1$ unitTc.setWidth(70); TableColumn foodTc = new TableColumn(t, SWT.LEFT, 2); foodTc.setText(Messages.getString("PartDetails.food")); //$NON-NLS-1$ foodTc.setWidth(200);

TextCellEditor ce1 = new TextCellEditor(t); ComboBoxCellEditor ce2 = new ComboBoxCellEditor(t,UnitLoader.getInstance().getUnitsAsString(),SWT.DROP_DOWN|SWT.READ_ONLY); IngredientDialogCellEditor ce3 = new IngredientDialogCellEditor(t);

ingredientViewer = new TableViewer(t); ingredientViewer.setContentProvider(new PartsContentProvider()); ingredientViewer.setColumnProperties(new String[] {"amount","unit","food"}); ingredientViewer.setLabelProvider(new PartsLabelProvider()); ingredientViewer.setCellEditors(new CellEditor[] { ce1, ce2, ce3 }); ingredientViewer.setCellModifier(new IngredientCellModifier());

	toolkit.paintBordersFor(s1);
	toolkit.paintBordersFor(client);
	s1.setClient(client);

final Section s2 = toolkit.createSection(parent, Section.EXPANDED| Section.COMPACT | Section.TWISTIE); s2.marginWidth = 10; s2.setText("Steps"); s2.setDescription("Insert all the properties for one part of the recipe"); s2.addExpansionListener(new IExpansionListener() { public void expansionStateChanging(ExpansionEvent e) { }

            public void expansionStateChanged(ExpansionEvent e) {
                if (!(s2.isExpanded())) {
                    parent.pack();
                }

            }
        });
	gd = new GridData(GridData.FILL_BOTH);
	gd.horizontalSpan = 1;
	s2.setLayoutData(gd);
	toolkit.createCompositeSeparator(s2);
	Composite client2 = toolkit.createComposite(s2);
	GridLayout glayout2 = new GridLayout();
	glayout2.marginWidth = glayout2.marginHeight = 5;
	glayout2.numColumns = 2;
	client2.setLayout(glayout2);

gd = new GridData(GridData.FILL_BOTH); gd.horizontalSpan=2; steps = toolkit.createText(client2,"",SWT.MULTI | SWT.WRAP); steps.setData(FormToolkit.KEY_DRAW_BORDER, FormToolkit.TREE_BORDER);

        steps.setLayoutData(gd);

	toolkit.paintBordersFor(client2);
	toolkit.paintBordersFor(s2);
	s2.setClient(client2);
    }

    public void initialize(IManagedForm form) {
        mform=form;
    }

    public void dispose() {
    }

    public boolean isDirty() {
        return false;
    }

    public void commit(boolean onSave) {
    }

    public boolean setFormInput(Object input) {
        return false;
    }

    public void setFocus() {
    }

    public boolean isStale() {
        return false;
    }

    public void refresh() {
    }

    public void selectionChanged(IFormPart part, ISelection selection) {
	IStructuredSelection ssel = (IStructuredSelection)selection;
	if (ssel.size()==1) {
	    Part input = (Part)ssel.getFirstElement();
	    ingredientViewer.setInput(input);
	    steps.setText(getStepsAsString(input));
	}
    }

    protected String getStepsAsString(Part part) {
        String temp="";
        log.debug("Amount of Steps: "+part.getSteps().size());
        Iterator it = part.getSteps().iterator();

        while (it.hasNext()) {
            Step step = (Step)it.next();
            log.debug("Step.text() = "+step.getText());
            temp+=step.getText()+"\n\n";
        }
        return temp;
    }
}

!ENTRY org.eclipse.ui.workbench 4 2 2005-07-27 22:31:39.656 !MESSAGE Problems occurred when invoking code from plug-in: "org.eclipse.ui.workbench". !STACK 0 java.lang.NullPointerException at org.eclipse.swt.widgets.Table.releaseWidget(Table.java:1705) at org.eclipse.swt.widgets.Widget.releaseResources(Widget.java:720) at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:588) at org.eclipse.swt.widgets.Composite.releaseWidget(Composite.java:593) at org.eclipse.swt.widgets.Widget.releaseResources(Widget.java:720) at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:588) at org.eclipse.swt.widgets.Composite.releaseWidget(Composite.java:593) at org.eclipse.swt.widgets.Widget.releaseResources(Widget.java:720) at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:588) at org.eclipse.swt.widgets.Composite.releaseWidget(Composite.java:593) at org.eclipse.swt.widgets.Widget.releaseResources(Widget.java:720) at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:588) at org.eclipse.swt.widgets.Composite.releaseWidget(Composite.java:593) at org.eclipse.swt.widgets.Widget.releaseResources(Widget.java:720) at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:588) at org.eclipse.swt.widgets.Composite.releaseWidget(Composite.java:593) at org.eclipse.swt.widgets.Widget.releaseResources(Widget.java:720) at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:588) at org.eclipse.swt.widgets.Composite.releaseWidget(Composite.java:593) at org.eclipse.swt.widgets.Widget.releaseResources(Widget.java:720) at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:588) at org.eclipse.swt.widgets.Composite.releaseWidget(Composite.java:593) at org.eclipse.swt.widgets.Widget.releaseResources(Widget.java:720) at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:588) at org.eclipse.swt.widgets.Composite.releaseWidget(Composite.java:593) at org.eclipse.swt.widgets.Widget.releaseResources(Widget.java:720) at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:588) at org.eclipse.swt.widgets.Composite.releaseWidget(Composite.java:593) at org.eclipse.swt.widgets.Widget.releaseResources(Widget.java:720) at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:588) at org.eclipse.swt.widgets.Composite.releaseWidget(Composite.java:593) at org.eclipse.swt.widgets.Widget.releaseResources(Widget.java:720) at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:588) at org.eclipse.swt.widgets.Composite.releaseWidget(Composite.java:593) at org.eclipse.swt.widgets.Widget.releaseResources(Widget.java:720) at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:588) at org.eclipse.swt.widgets.Composite.releaseWidget(Composite.java:593) at org.eclipse.swt.widgets.Widget.releaseResources(Widget.java:720) at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:588) at org.eclipse.swt.widgets.Composite.releaseWidget(Composite.java:593) at org.eclipse.swt.widgets.Widget.releaseResources(Widget.java:720) at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:588) at org.eclipse.swt.widgets.Composite.releaseWidget(Composite.java:593) at org.eclipse.swt.widgets.Widget.releaseResources(Widget.java:720) at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:588) at org.eclipse.swt.widgets.Composite.releaseWidget(Composite.java:593) at org.eclipse.swt.widgets.Widget.releaseResources(Widget.java:720) at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:588) at org.eclipse.swt.widgets.Composite.releaseWidget(Composite.java:593) at org.eclipse.swt.widgets.Canvas.releaseWidget(Canvas.java:117) at org.eclipse.swt.widgets.Decorations.releaseWidget(Decorations.java:782) at org.eclipse.swt.widgets.Shell.releaseWidget(Shell.java:868) at org.eclipse.swt.widgets.Widget.dispose(Widget.java:382) at org.eclipse.swt.widgets.Decorations.dispose(Decorations.java:441) at org.eclipse.swt.widgets.Shell.dispose(Shell.java:499) at org.eclipse.jface.window.Window.close(Window.java:321) at org.eclipse.jface.window.ApplicationWindow.close(ApplicationWindow.java:291) at org.eclipse.ui.internal.WorkbenchWindow.hardClose(WorkbenchWindow.java:1403) at org.eclipse.ui.internal.WorkbenchWindow.busyClose(WorkbenchWindow.java:646) at org.eclipse.ui.internal.WorkbenchWindow.access$0(WorkbenchWindow.java:627) at org.eclipse.ui.internal.WorkbenchWindow$2.run(WorkbenchWindow.java:728) at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:69) at org.eclipse.ui.internal.WorkbenchWindow.close(WorkbenchWindow.java:726) at org.eclipse.jface.window.WindowManager.close(WindowManager.java:108) at org.eclipse.ui.internal.Workbench$11.run(Workbench.java:588) at org.eclipse.core.internal.runtime.InternalPlatform.run(InternalPlatform.java:1044) at org.eclipse.core.runtime.Platform.run(Platform.java:783) at org.eclipse.ui.internal.Workbench.busyClose(Workbench.java:585) at org.eclipse.ui.internal.Workbench.access$8(Workbench.java:522) at org.eclipse.ui.internal.Workbench$13.run(Workbench.java:713) at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:69) at org.eclipse.ui.internal.Workbench.close(Workbench.java:711) at org.eclipse.ui.internal.Workbench.close(Workbench.java:686) at org.eclipse.ui.internal.WorkbenchWindow.busyClose(WorkbenchWindow.java:643) at org.eclipse.ui.internal.WorkbenchWindow.access$0(WorkbenchWindow.java:627) at org.eclipse.ui.internal.WorkbenchWindow$2.run(WorkbenchWindow.java:728) at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:69) at org.eclipse.ui.internal.WorkbenchWindow.close(WorkbenchWindow.java:726) at org.eclipse.jface.window.Window.handleShellCloseEvent(Window.java:727) at org.eclipse.jface.window.Window$3.shellClosed(Window.java:674) at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:159) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:843) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:867) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:852) at org.eclipse.swt.widgets.Decorations.closeWidget(Decorations.java:257) at org.eclipse.swt.widgets.Decorations.WM_CLOSE(Decorations.java:1649) at org.eclipse.swt.widgets.Control.windowProc(Control.java:3040) at org.eclipse.swt.widgets.Decorations.windowProc(Decorations.java:1582) at org.eclipse.swt.widgets.Display.windowProc(Display.java:3706) at org.eclipse.swt.internal.win32.OS.DefWindowProcW(Native Method) at org.eclipse.swt.internal.win32.OS.DefWindowProc(OS.java:1651) at org.eclipse.swt.widgets.Shell.callWindowProc(Shell.java:410) at org.eclipse.swt.widgets.Control.windowProc(Control.java:3123) at org.eclipse.swt.widgets.Decorations.windowProc(Decorations.java:1582) at org.eclipse.swt.widgets.Display.windowProc(Display.java:3706) at org.eclipse.swt.internal.win32.OS.DefWindowProcW(Native Method) at org.eclipse.swt.internal.win32.OS.DefWindowProc(OS.java:1651) at org.eclipse.swt.widgets.Shell.callWindowProc(Shell.java:410) at org.eclipse.swt.widgets.Control.windowProc(Control.java:3123) at org.eclipse.swt.widgets.Decorations.windowProc(Decorations.java:1582) at org.eclipse.swt.widgets.Display.windowProc(Display.java:3706) at org.eclipse.swt.internal.win32.OS.DispatchMessageW(Native Method) at org.eclipse.swt.internal.win32.OS.DispatchMessage(OS.java:1656) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2711) at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:1699) at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:1663) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:367) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:143) at de.beecook.core.BeeCookApplication.run(BeeCookApplication.java:39) at org.eclipse.core.internal.runtime.PlatformActivator$1.run(PlatformActivator.java:226) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:376) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:163) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:324) at org.eclipse.core.launcher.Main.invokeFramework(Main.java:334) at org.eclipse.core.launcher.Main.basicRun(Main.java:278) at org.eclipse.core.launcher.Main.run(Main.java:973) at org.eclipse.core.launcher.Main.main(Main.java:948)

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