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/*******************************************************************************
* Copyright (c) 2000, 2006 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.internal.ccvs.core.client;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;
import org.eclipse.team.internal.ccvs.core.CVSException;
import org.eclipse.team.internal.ccvs.core.ICVSFile;
import org.eclipse.team.internal.ccvs.core.ICVSFolder;
import org.eclipse.team.internal.ccvs.core.ICVSResource;
import org.eclipse.team.internal.ccvs.core.ICVSResourceVisitor;
/**
* Goes recursivly through the folders checks if they are empyty
* and deletes them. Of course it is starting at the leaves of the
* recusion (the folders that do not have subfolders).
*/
public class PruneFolderVisitor implements ICVSResourceVisitor {
private ICVSFolder localRoot;
public PruneFolderVisitor() {
}
/**
* This method is used to visit a set of ICVSResources.
*/
public void visit(Session s, ICVSResource[] resources) throws CVSException {
visit(s.getLocalRoot(), resources);
}
/**
* This method is used to visit a set of ICVSResources.
*/
public void visit(ICVSFolder root, ICVSResource[] resources) throws CVSException {
localRoot = root;
// Visit the resources
Set prunableParents = new HashSet();
for (int i = 0; i < resources.length; i++) {
ICVSResource cvsResource = resources[i];
// prune the resource and it's children when appropriate
cvsResource.accept(this);
// if the resource doesn't exists, attempt to prune it's parent
if (!cvsResource.exists())
prunableParents.add(cvsResource.getParent());
}
for (Iterator iter = prunableParents.iterator(); iter.hasNext();) {
ICVSFolder cvsFolder = (ICVSFolder)iter.next();
pruneFolderAndParentsIfAppropriate(cvsFolder);
}
}
@Override
public void visitFile(ICVSFile file) throws CVSException {
// nothing to do here
}
@Override
public void visitFolder(ICVSFolder folder) throws CVSException {
// First prune any empty children
folder.acceptChildren(this);
// Then prune the folder if it is empty
pruneFolderIfAppropriate(folder);
}
private void pruneFolderIfAppropriate(ICVSFolder folder) throws CVSException {
// Only prune managed folders that are not the root of the operation
if (folder.exists() && folder.isManaged()
&& ! folder.equals(getLocalRoot())
&& folder.members(ICVSFolder.ALL_EXISTING_MEMBERS).length == 0) {
// Delete the folder but keep a phantom for local folders
folder.delete();
}
}
private ICVSFolder getLocalRoot() {
return localRoot;
}
/**
* Attempt to prune the given folder. If the folder is pruned, attempt to prune it's parent.
*/
private void pruneFolderAndParentsIfAppropriate(ICVSFolder folder) throws CVSException {
pruneFolderIfAppropriate(folder);
if (!folder.exists()) {
ICVSFolder parent = folder.getParent();
pruneFolderAndParentsIfAppropriate(parent);
}
}
}
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