| /* |
| * Copyright (c) 2009-2012 Eike Stepper (Berlin, Germany) and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * Simon McDuff - initial API and implementation |
| * Eike Stepper - maintenance |
| */ |
| package org.eclipse.emf.internal.cdo.view; |
| |
| import org.eclipse.emf.cdo.common.branch.CDOBranchPoint; |
| import org.eclipse.emf.cdo.common.id.CDOID; |
| import org.eclipse.emf.cdo.common.revision.CDOList; |
| import org.eclipse.emf.cdo.common.revision.CDORevisionManager; |
| import org.eclipse.emf.cdo.view.CDORevisionPrefetchingPolicy; |
| |
| import org.eclipse.emf.ecore.EObject; |
| import org.eclipse.emf.ecore.EStructuralFeature; |
| |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.HashSet; |
| import java.util.List; |
| import java.util.Set; |
| |
| /** |
| * @author Simon McDuff |
| * @since 2.0 |
| */ |
| public class CDORevisionPrefetchingPolicyImpl implements CDORevisionPrefetchingPolicy |
| { |
| private int chunkSize; |
| |
| public CDORevisionPrefetchingPolicyImpl(int chunkSize) |
| { |
| this.chunkSize = chunkSize; |
| } |
| |
| public List<CDOID> loadAhead(CDORevisionManager revisionManager, CDOBranchPoint branchPoint, EObject eObject, |
| EStructuralFeature feature, CDOList list, int accessIndex, CDOID accessID) |
| { |
| if (chunkSize > 1 && !revisionManager.containsRevision(accessID, branchPoint)) |
| { |
| int fromIndex = accessIndex; |
| int toIndex = Math.min(accessIndex + chunkSize, list.size()) - 1; |
| |
| Set<CDOID> notRegistered = new HashSet<CDOID>(); |
| for (int i = fromIndex; i <= toIndex; i++) |
| { |
| Object element = list.get(i); |
| if (element instanceof CDOID) |
| { |
| CDOID idElement = (CDOID)element; |
| if (!idElement.isTemporary() && !idElement.isExternal()) |
| { |
| if (!revisionManager.containsRevision(idElement, branchPoint)) |
| { |
| if (!notRegistered.contains(idElement)) |
| { |
| notRegistered.add(idElement); |
| } |
| } |
| } |
| } |
| } |
| |
| return new ArrayList<CDOID>(notRegistered); |
| } |
| |
| return Collections.emptyList(); |
| } |
| } |