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/*******************************************************************************
* 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();
}
}
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