| /******************************************************************************* |
| * Copyright (c) 2006, 2013 IBM Corporation and others. |
| * |
| * This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| * Wind River Systems - Fix for viewer state save/restore [188704] |
| * Pawel Piech (Wind River) - added support for a virtual tree model viewer (Bug 242489) |
| *******************************************************************************/ |
| package org.eclipse.debug.internal.ui.viewers.model; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.eclipse.debug.internal.ui.DebugUIPlugin; |
| import org.eclipse.debug.internal.ui.viewers.model.provisional.IElementContentProvider; |
| import org.eclipse.debug.internal.ui.viewers.model.provisional.IHasChildrenUpdate; |
| import org.eclipse.jface.viewers.TreePath; |
| |
| /** |
| * @since 3.3 |
| */ |
| class HasChildrenUpdate extends ViewerUpdateMonitor implements IHasChildrenUpdate { |
| |
| private boolean fHasChildren = false; |
| |
| private List<ViewerUpdateMonitor> fBatchedRequests = null; |
| |
| /** |
| * Constructs a request to update an element |
| * |
| * @param provider the content provider |
| * @param viewerInput the current input |
| * @param elementPath the path to the element being update |
| * @param element the element |
| * @param elementContentProvider the content provider for the element |
| */ |
| public HasChildrenUpdate(TreeModelContentProvider provider, Object viewerInput, TreePath elementPath, Object element, IElementContentProvider elementContentProvider) { |
| super(provider, viewerInput, elementPath, element, elementContentProvider, provider.getPresentationContext()); |
| } |
| |
| @Override |
| protected void performUpdate() { |
| TreeModelContentProvider contentProvider = getContentProvider(); |
| TreePath elementPath = getElementPath(); |
| if (!fHasChildren) { |
| contentProvider.clearFilters(elementPath); |
| } |
| if (DebugUIPlugin.DEBUG_CONTENT_PROVIDER && DebugUIPlugin.DEBUG_TEST_PRESENTATION_ID(getPresentationContext())) { |
| } |
| contentProvider.getViewer().setHasChildren(elementPath, fHasChildren); |
| if (fHasChildren) { |
| contentProvider.getViewer().autoExpand(elementPath); |
| } |
| if (elementPath.getSegmentCount() > 0) { |
| getContentProvider().getStateTracker().restorePendingStateOnUpdate(getElementPath(), -1, true, false, false); |
| } |
| } |
| |
| @Override |
| public void setHasChilren(boolean hasChildren) { |
| fHasChildren = hasChildren; |
| } |
| |
| @Override |
| public String toString() { |
| StringBuffer buf = new StringBuffer(); |
| buf.append("IHasChildrenUpdate: "); //$NON-NLS-1$ |
| buf.append(getElement()); |
| return buf.toString(); |
| } |
| |
| @Override |
| boolean coalesce(ViewerUpdateMonitor request) { |
| if (request instanceof HasChildrenUpdate) { |
| if (getElementPath().equals(request.getElementPath())) { |
| // duplicate request |
| return true; |
| } else if (getElementContentProvider().equals(request.getElementContentProvider())) { |
| if (fBatchedRequests == null) { |
| fBatchedRequests = new ArrayList<>(); |
| fBatchedRequests.add(this); |
| } |
| fBatchedRequests.add(request); |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| @Override |
| void startRequest() { |
| if (fBatchedRequests == null) { |
| getElementContentProvider().update(new IHasChildrenUpdate[]{this}); |
| } else { |
| IHasChildrenUpdate[] updates = fBatchedRequests.toArray(new IHasChildrenUpdate[fBatchedRequests.size()]); |
| // notify that the other updates have also started to ensure correct sequence |
| // of model updates - **** start at index 1 since the first (0) update has |
| // already notified the content provider that it has started. |
| for (int i = 1; i < updates.length; i++) { |
| getContentProvider().updateStarted((ViewerUpdateMonitor) updates[i]); |
| } |
| getElementContentProvider().update(updates); |
| } |
| } |
| |
| @Override |
| boolean containsUpdate(TreePath path) { |
| if (getElementPath().equals(path)) { |
| return true; |
| } else if (fBatchedRequests != null) { |
| for (int i = 0; i < fBatchedRequests.size(); i++) { |
| if (fBatchedRequests.get(i).getElementPath().equals(path)) { |
| return true; |
| } |
| } |
| } |
| return false; |
| } |
| |
| @Override |
| int getPriority() { |
| return 1; |
| } |
| |
| @Override |
| TreePath getSchedulingPath() { |
| TreePath path = getElementPath(); |
| if (path.getSegmentCount() > 0) { |
| return path.getParentPath(); |
| } |
| return path; |
| } |
| |
| boolean hasChildren() { |
| return fHasChildren; |
| } |
| |
| @Override |
| protected boolean doEquals(ViewerUpdateMonitor update) { |
| return |
| update instanceof HasChildrenUpdate && |
| getViewerInput().equals(update.getViewerInput()) && |
| getElementPath().equals(update.getElementPath()); |
| } |
| |
| @Override |
| protected int doHashCode() { |
| return getClass().hashCode() + getViewerInput().hashCode() + getElementPath().hashCode(); |
| } |
| |
| } |