| /*=============================================================================# |
| # Copyright (c) 2010, 2020 Stephan Wahlbrink and others. |
| # |
| # This program and the accompanying materials are made available under the |
| # terms of the Eclipse Public License 2.0 which is available at |
| # https://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0 |
| # which is available at https://www.apache.org/licenses/LICENSE-2.0. |
| # |
| # SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 |
| # |
| # Contributors: |
| # Stephan Wahlbrink <sw@wahlbrink.eu> - initial API and implementation |
| #=============================================================================*/ |
| |
| package org.eclipse.statet.ltk.ui.sourceediting.assist; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.eclipse.jface.text.IInformationControlCreator; |
| |
| import org.eclipse.statet.jcommons.lang.NonNullByDefault; |
| import org.eclipse.statet.jcommons.lang.Nullable; |
| import org.eclipse.statet.jcommons.status.ProgressMonitor; |
| import org.eclipse.statet.jcommons.status.StatusException; |
| import org.eclipse.statet.jcommons.status.Statuses; |
| |
| |
| /** |
| * Special information hover showing the first match of the specified hover types. |
| */ |
| @NonNullByDefault |
| public class CombinedHover implements InfoHover { |
| |
| |
| private List<InfoHoverDescriptor> descriptors; |
| private List<InfoHover> instantiatedHovers; |
| |
| private volatile @Nullable InfoHover bestHover; |
| |
| |
| public CombinedHover() { |
| } |
| |
| |
| public synchronized void setHovers(final List<InfoHoverDescriptor> descriptors) { |
| this.descriptors= descriptors; |
| this.instantiatedHovers= new ArrayList<>(descriptors.size()); |
| } |
| |
| |
| @Override |
| public @Nullable Object getHoverInfo(final AssistInvocationContext context, |
| final ProgressMonitor m) throws StatusException { |
| this.bestHover= null; |
| final List<InfoHoverDescriptor> descriptors; |
| final List<InfoHover> instantiatedHovers; |
| synchronized (this) { |
| descriptors= this.descriptors; |
| instantiatedHovers= this.instantiatedHovers; |
| } |
| if (descriptors == null) { |
| return null; |
| } |
| |
| for (int i= 0; i < descriptors.size(); i++) { |
| m.setWorkRemaining(descriptors.size() - i); |
| if (m.isCanceled()) { |
| throw new StatusException(Statuses.CANCEL_STATUS); |
| } |
| |
| if (i == instantiatedHovers.size()) { |
| instantiatedHovers.add(descriptors.get(i).createHover()); |
| } |
| final InfoHover hover= instantiatedHovers.get(i); |
| if (hover != null) { |
| try { |
| final Object info= hover.getHoverInfo(context, m.newSubMonitor(1)); |
| if (info != null) { |
| this.bestHover= hover; |
| return info; |
| } |
| } |
| catch (final StatusException e) { |
| } |
| } |
| } |
| return null; |
| } |
| |
| @Override |
| public @Nullable IInformationControlCreator getHoverControlCreator() { |
| final InfoHover hover= this.bestHover; |
| if (hover != null) { |
| return hover.getHoverControlCreator(); |
| } |
| return null; |
| } |
| |
| } |