| /******************************************************************************* |
| * Copyright (c) 2000, 2017 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 |
| *******************************************************************************/ |
| package org.eclipse.team.core.variants; |
| |
| import java.util.ArrayList; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| |
| import org.eclipse.core.resources.IContainer; |
| import org.eclipse.core.resources.IResource; |
| import org.eclipse.core.runtime.Assert; |
| import org.eclipse.team.core.TeamException; |
| |
| /** |
| * A <code>ResourceVariantByteStore</code> that caches the variant bytes in |
| * memory and does not persist them over workbench invocations. |
| * |
| * @since 3.0 |
| * @noextend This class is not intended to be subclassed by clients. |
| */ |
| public class SessionResourceVariantByteStore extends ResourceVariantByteStore { |
| |
| private static final byte[] NO_REMOTE = new byte[0]; |
| private Map<IResource, List<IResource>> membersCache = new HashMap<>(); |
| |
| private Map<IResource, byte[]> syncBytesCache = new HashMap<>(); |
| |
| @Override |
| public boolean deleteBytes(IResource resource) throws TeamException { |
| return flushBytes(resource, IResource.DEPTH_ZERO); |
| } |
| |
| @Override |
| public void dispose() { |
| syncBytesCache.clear(); |
| membersCache.clear(); |
| } |
| |
| @Override |
| public boolean flushBytes(IResource resource, int depth) throws TeamException { |
| if (getSyncBytesCache().containsKey(resource)) { |
| if (depth != IResource.DEPTH_ZERO) { |
| IResource[] members = members(resource); |
| for (int i = 0; i < members.length; i++) { |
| IResource child = members[i]; |
| flushBytes(child, (depth == IResource.DEPTH_INFINITE) ? IResource.DEPTH_INFINITE: IResource.DEPTH_ZERO); |
| } |
| } |
| getSyncBytesCache().remove(resource); |
| internalRemoveFromParent(resource); |
| return true; |
| } |
| return false; |
| } |
| |
| @Override |
| public byte[] getBytes(IResource resource) throws TeamException { |
| byte[] syncBytes = internalGetSyncBytes(resource); |
| if (syncBytes != null && equals(syncBytes, NO_REMOTE)) { |
| // If it is known that there is no remote, return null |
| return null; |
| } |
| return syncBytes; |
| } |
| |
| /** |
| * Return <code>true</code> if no bytes are contained in this tree. |
| * @return <code>true</code> if no bytes are contained in this tree. |
| */ |
| public boolean isEmpty() { |
| return syncBytesCache.isEmpty(); |
| } |
| |
| @Override |
| public IResource[] members(IResource resource) { |
| List<IResource> members = membersCache.get(resource); |
| if (members == null) { |
| return new IResource[0]; |
| } |
| return members.toArray(new IResource[members.size()]); |
| } |
| |
| @Override |
| public boolean setBytes(IResource resource, byte[] bytes) throws TeamException { |
| Assert.isNotNull(bytes); |
| byte[] oldBytes = internalGetSyncBytes(resource); |
| if (oldBytes != null && equals(oldBytes, bytes)) return false; |
| internalSetSyncInfo(resource, bytes); |
| return true; |
| } |
| |
| private Map<IResource, byte[]> getSyncBytesCache() { |
| return syncBytesCache; |
| } |
| |
| private void internalAddToParent(IResource resource) { |
| IContainer parent = resource.getParent(); |
| if (parent == null) return; |
| List<IResource> members = membersCache.get(parent); |
| if (members == null) { |
| members = new ArrayList<>(); |
| membersCache.put(parent, members); |
| } |
| members.add(resource); |
| } |
| |
| private byte[] internalGetSyncBytes(IResource resource) { |
| return getSyncBytesCache().get(resource); |
| } |
| |
| private void internalRemoveFromParent(IResource resource) { |
| IContainer parent = resource.getParent(); |
| List members = membersCache.get(parent); |
| if (members != null) { |
| members.remove(resource); |
| if (members.isEmpty()) { |
| membersCache.remove(parent); |
| } |
| } |
| } |
| |
| private void internalSetSyncInfo(IResource resource, byte[] bytes) { |
| getSyncBytesCache().put(resource, bytes); |
| internalAddToParent(resource); |
| } |
| } |