Example usage for com.google.common.base Predicates alwaysFalse

Introduction

In this page you can find the example usage for com.google.common.base Predicates alwaysFalse.

Prototype

@GwtCompatible(serializable = true)
public static <T> Predicate<T> alwaysFalse()

Source Link

Document

Returns a predicate that always evaluates to false .

Usage

From source file:org.eclipse.sirius.diagram.ui.tools.internal.actions.visibility.HideDDiagramElementAction.java

/**
 * Indicates if the given ddiagram is allowing pin/unpin.
 * /* ww w.j a  v  a  2 s  .  c o  m*/
 * @param diagram
 *            the diagram to inspect
 * @return true if the given ddiagram is allowing layouting mode, false
 *         otherwise
 */
public static Predicate<DDiagramElement> allowsHideReveal(DDiagram diagram) {
    // default return value is true for non-Region element (for basic
    // DDiagram that are not handled
    // by any DiagramDescriptionProvider).
    Predicate<DDiagramElement> result = new Predicate<DDiagramElement>() {
        @Override
        public boolean apply(DDiagramElement dde) {
            if (dde instanceof DDiagramElementContainer) {
                DDiagramElementContainerExperimentalQuery query = new DDiagramElementContainerExperimentalQuery(
                        (DDiagramElementContainer) dde);
                return !query.isRegion();
            }
            return true;
        }
    };

    // If an aird has been opened from the Package Explorer View, then
    // we return false as no diagram is associated to this editor
    if (diagram == null || diagram.getDescription() == null || !isEditable(diagram)) {
        return Predicates.alwaysFalse();
    }

    // If diagram is not null, we search for a possible
    // DiagramDescriptionProvider handling this type of diagram
    for (final IDiagramTypeDescriptor diagramTypeDescriptor : DiagramTypeDescriptorRegistry.getInstance()
            .getAllDiagramTypeDescriptors()) {
        if (diagramTypeDescriptor.getDiagramDescriptionProvider()
                .handles(diagram.getDescription().eClass().getEPackage())) {
            // This DiagramDescriptionProvider may forbid hide/reveal
            // actions.
            final IDiagramDescriptionProvider provider = diagramTypeDescriptor.getDiagramDescriptionProvider();
            result = new Predicate<DDiagramElement>() {
                @Override
                public boolean apply(DDiagramElement input) {
                    return provider.allowsHideReveal(input);
                }
            };
            break;
        }
    }

    return result;
}

From source file:org.eclipse.sirius.diagram.ui.tools.internal.dialogs.DiagramElementsSelectionDialog.java

/**
 * Sets the predicate to use to detect which elements of the diagram are
 * selected, in the sense of the criterion to be edited.
 * /*from   w  ww.  ja v a 2s. c o m*/
 * @param isGrayedPredicate
 *            the predicate to used to detect selected elements of the
 *            diagram.
 */
public void setGrayedPredicate(Predicate<Object> isGrayedPredicate) {
    this.isGrayed = isGrayedPredicate != null ? isGrayedPredicate : Predicates.alwaysFalse();
}

From source file:com.eucalyptus.compute.common.internal.tags.FilterSupport.java

private static <T> Function<? super String, Predicate<? super T>> falseFilter() {
    return Functions.<Predicate<? super T>>constant(Predicates.alwaysFalse());
}

From source file:org.eclipse.sirius.diagram.ui.tools.internal.dialogs.DiagramElementsSelectionDialog.java

/**
 * Create an configure a selection dialog which allows the user to select a
 * sub-set of the elements in the diagram.
 * // w w  w  .  ja v a  2s  .c  om
 * @param parent
 *            the parent shell.
 * @param initialSelection
 *            the set of elements to display as checked on dialog opening.
 */
protected void setupDialog(Shell parent, Set<Object> initialSelection) {
    dialog = new CustomTreeSelectionDialog(parent, new SelectionDialogLabelProvider(), contentProvider);
    dialog.setTitle(title);

    String msg = message;
    if (!Predicates.alwaysFalse().equals(isGrayed)) {
        StringBuilder sb = new StringBuilder(message);
        sb.append("\n"); //$NON-NLS-1$
        sb.append(Messages.DiagramElementsSelectionDialog_grayedElementDialogMessage);
        msg = sb.toString();
    }
    dialog.setMessage(msg);
    dialog.setInput(diagram);
    dialog.addFilter(new ModeFilter());
    dialog.setInitialElementSelections(Lists.newArrayList(initialSelection));
}

From source file:org.obeonetwork.dsl.uml2.core.api.wizards.ModelElementsSelectionDialog.java

/**
 * Sets the predicate to use to detect which elements of the diagram are
 * selected, in the sense of the criterion to be edited.
 *
 * @param isGrayedPredicate/*from w w w .  j a  va2s.  co  m*/
 *            the predicate to used to detect selected elements of the
 *            diagram.
 */
@SuppressWarnings("unchecked")
public void setGrayedPredicate(Predicate<EObject> isGrayedPredicate) {
    isGrayed = Predicates.and(
            (Predicate<? super Object>) (isGrayedPredicate != null ? isGrayedPredicate
                    : Predicates.alwaysFalse()),
            AddElementToDiagramServices.INSTANCE.isValidForDiagram(diagram, eObject));
}

From source file:org.obeonetwork.dsl.uml2.core.api.wizards.ModelElementsSelectionDialog.java

/**
 * Create an configure a selection dialog which allows the user to select a
 * sub-set of the elements in the diagram.
 *
 * @param parent//from   w  ww .  j a  v a 2s .c  o  m
 *            the parent shell.
 * @param initialSelection
 *            the set of elements to display as checked on dialog opening.
 */
protected void setupDialog(Shell parent, Set<Object> initialSelection) {
    dialog = new CustomTreeSelectionDialog(parent, new SelectionDialogLabelProvider(), contentProvider);
    dialog.setTitle(title);

    String msg = message;
    if (!Predicates.alwaysFalse().equals(isGrayed)) {
        final StringBuilder sb = new StringBuilder(message);
        sb.append("\n"); //$NON-NLS-1$
        sb.append("The wizard will have no effect on grayed elements."); //$NON-NLS-1$
        msg = sb.toString();
    }
    dialog.setMessage(msg);
    final Collection<Element> roots = ElementServices.INSTANCE.getAllRootsInSession(eObject);

    dialog.setInput(roots);
    dialog.addFilter(new ModeFilter());
    dialog.setInitialElementSelections(Lists.newArrayList(initialSelection));
}

From source file:org.obeonetwork.dsl.uml2.design.api.wizards.ModelElementsSelectionDialog.java

/**
 * Sets the predicate to use to detect which elements of the diagram are selected, in the sense of the
 * criterion to be edited./*  ww  w .j  a  v a  2s.  c  o  m*/
 *
 * @param isGrayedPredicate
 *            the predicate to used to detect selected elements of the diagram.
 */
@SuppressWarnings("unchecked")
public void setGrayedPredicate(Predicate<EObject> isGrayedPredicate) {
    isGrayed = Predicates.and((Predicate<? super Object>) (isGrayedPredicate != null ? isGrayedPredicate
            : Predicates.alwaysFalse()), isValidForDiagram());
}