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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.ArrayList;
import java.util.List;
import org.eclipse.core.resources.*;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.QualifiedName;
import org.eclipse.team.core.TeamException;
import org.eclipse.team.internal.core.Assert;
/**
* A <code>ResourceVariantByteStore</code> that caches the variant bytes using
* the <code>org.eclipse.core.resources.ISynchronizer</code> so that
* the tree is cached accross workbench invocations.
* <p>
* This class is not intended to be subclassed by clients
*
* @since 3.0
*/
public class PersistantResourceVariantByteStore extends ResourceVariantByteStore {
private static final byte[] NO_REMOTE = new byte[0];
private QualifiedName syncName;
/**
* Create a persistant tree that uses the given qualified name
* as the key in the <code>org.eclipse.core.resources.ISynchronizer</code>.
* It must be unique and should use the plugin as the local name
* and a unique id within the plugin as the qualifier name.
* @param name the key used in the Core synchronizer
*/
public PersistantResourceVariantByteStore(QualifiedName name) {
syncName = name;
getSynchronizer().add(syncName);
}
/* (non-Javadoc)
* @see org.eclipse.team.internal.core.subscribers.caches.ResourceVariantByteStore#dispose()
*/
public void dispose() {
getSynchronizer().remove(getSyncName());
}
/**
* Return the qualified name that uniquely identifies this tree.
* @return the qwualified name that uniquely identifies this tree.
*/
public QualifiedName getSyncName() {
return syncName;
}
/* (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;
try {
getSynchronizer().setSyncInfo(getSyncName(), resource, bytes);
return true;
} catch (CoreException e) {
throw TeamException.asTeamException(e);
}
}
/* (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 (resource.exists() || resource.isPhantom()) {
try {
if (depth != IResource.DEPTH_ZERO || internalGetSyncBytes(resource) != null) {
getSynchronizer().flushSyncInfo(getSyncName(), resource, depth);
return true;
}
} catch (CoreException e) {
throw TeamException.asTeamException(e);
}
}
return false;
}
/* (non-Javadoc)
* @see org.eclipse.team.internal.core.subscribers.caches.ResourceVariantByteStore#isVariantKnown(org.eclipse.core.resources.IResource)
*/
public boolean isVariantKnown(IResource resource) throws TeamException {
return internalGetSyncBytes(resource) != null;
}
/**
* This method should be invoked by a client to indicate that it is known that
* there is no remote resource associated with the local resource. After this method
* is invoked, <code>isRemoteKnown(resource)</code> will return <code>true</code> and
* <code>getSyncBytes(resource)</code> will return <code>null</code>.
* @return <code>true</code> if this changes the remote sync bytes
*/
public boolean deleteBytes(IResource resource) throws TeamException {
return setBytes(resource, NO_REMOTE);
}
/* (non-Javadoc)
* @see org.eclipse.team.internal.core.subscribers.caches.ResourceVariantByteStore#members(org.eclipse.core.resources.IResource)
*/
public IResource[] members(IResource resource) throws TeamException {
if(resource.getType() == IResource.FILE) {
return new IResource[0];
}
try {
// Filter and return only resources that have sync bytes in the cache.
IResource[] members = ((IContainer)resource).members(true /* include phantoms */);
List filteredMembers = new ArrayList(members.length);
for (int i = 0; i < members.length; i++) {
IResource member = members[i];
if(getBytes(member) != null) {
filteredMembers.add(member);
}
}
return (IResource[]) filteredMembers.toArray(new IResource[filteredMembers.size()]);
} catch (CoreException e) {
throw TeamException.asTeamException(e);
}
}
private ISynchronizer getSynchronizer() {
return ResourcesPlugin.getWorkspace().getSynchronizer();
}
private byte[] internalGetSyncBytes(IResource resource) throws TeamException {
try {
return getSynchronizer().getSyncInfo(getSyncName(), resource);
} catch (CoreException e) {
throw TeamException.asTeamException(e);
}
}
}
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