1 files changed, 142 insertions, 0 deletions
diff --git a/bundles/org.eclipse.team.core/src/org/eclipse/team/internal/core/subscribers/caches/SessionResourceVariantByteStore.java b/bundles/org.eclipse.team.core/src/org/eclipse/team/internal/core/subscribers/caches/SessionResourceVariantByteStore.java
new file mode 100644
index 000000000..cc32236cc
--- /dev/null
+++ b/bundles/org.eclipse.team.core/src/org/eclipse/team/internal/core/subscribers/caches/SessionResourceVariantByteStore.java
@@ -0,0 +1,142 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2003 IBM Corporation and others.
+ * All rights reserved. This program and the accompanying materials 
+ * are made available under the terms of the Common Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/cpl-v10.html
+ * 
+ * Contributors:
+ *     IBM Corporation - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.team.internal.core.subscribers.caches;
+
+import java.util.*;
+
+import org.eclipse.core.resources.IContainer;
+import org.eclipse.core.resources.IResource;
+import org.eclipse.team.core.TeamException;
+import org.eclipse.team.internal.core.Assert;
+
+/**
+ * A <code>ResourceVariantByteStore</code> that caches the variant bytes in memory 
+ * and does not persist them over workbench invocations.
+ */
+public class SessionResourceVariantByteStore extends ResourceVariantByteStore {
+
+	private static final byte[] NO_REMOTE = new byte[0];
+	
+	private Map syncBytesCache = new HashMap();
+	private Map membersCache = new HashMap();
+
+	private Map getSyncBytesCache() {
+		return syncBytesCache;
+	}
+	
+	private byte[] internalGetSyncBytes(IResource resource) {
+		return (byte[])getSyncBytesCache().get(resource);
+	}
+	
+	private void internalAddToParent(IResource resource) {
+		IContainer parent = resource.getParent();
+		if (parent == null) return;
+		List members = (List)membersCache.get(parent);
+		if (members == null) {
+			members = new ArrayList();
+			membersCache.put(parent, members);
+		}
+		members.add(resource);
+	}
+	
+	private void internalSetSyncInfo(IResource resource, byte[] bytes) {
+		getSyncBytesCache().put(resource, bytes);
+		internalAddToParent(resource);
+	}
+
+	private void internalRemoveFromParent(IResource resource) {
+		IContainer parent = resource.getParent();
+		List members = (List)membersCache.get(parent);
+		if (members != null) {
+			members.remove(resource);
+			if (members.isEmpty()) {
+				membersCache.remove(parent);
+			}
+		}
+	}
+	
+	/* (non-Javadoc)
+	 * @see org.eclipse.team.internal.core.subscribers.caches.ResourceVariantByteStore#dispose()
+	 */
+	public void dispose() {
+		syncBytesCache.clear();
+		membersCache.clear();
+	}
+
+	/* (non-Javadoc)
+	 * @see org.eclipse.team.internal.core.subscribers.caches.ResourceVariantByteStore#getBytes(org.eclipse.core.resources.IResource)
+	 */
+	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;
+	}
+
+	/*
+	 *  (non-Javadoc)
+	 * @see org.eclipse.team.internal.core.subscribers.caches.ResourceVariantByteStore#setBytes(org.eclipse.core.resources.IResource, byte[])
+	 */
+	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;
+	}
+
+	/* (non-Javadoc)
+	 * @see org.eclipse.team.internal.core.subscribers.caches.ResourceVariantByteStore#removeBytes(org.eclipse.core.resources.IResource, int)
+	 */
+	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;
+	}
+
+	/* (non-Javadoc)
+	 * @see org.eclipse.team.internal.core.subscribers.caches.ResourceVariantByteStore#members(org.eclipse.core.resources.IResource)
+	 */
+	public IResource[] members(IResource resource) {
+		List members = (List)membersCache.get(resource);
+		if (members == null) {
+			return new IResource[0];
+		}
+		return (IResource[]) members.toArray(new IResource[members.size()]);
+	}
+
+	/* (non-Javadoc)
+	 * @see org.eclipse.team.internal.core.subscribers.caches.ResourceVariantByteStore#setVariantDoesNotExist(org.eclipse.core.resources.IResource)
+	 */
+	public boolean deleteBytes(IResource resource) throws TeamException {
+		return flushBytes(resource, IResource.DEPTH_ZERO);
+	}
+
+	/**
+	 * 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();
+	}
+}