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/*******************************************************************************
* Copyright (c) 2011 VMware Inc.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* SpringSource, a division of VMware - initial API and implementation and/or initial documentation
*******************************************************************************/
package org.eclipse.equinox.region;
/**
* {@link RegionDigraphVisitor} is used to traverse a subgraph of a {@link RegionDigraph}.
* <p />
*
* <strong>Concurrent Semantics</strong><br />
*
* Implementations of this interface must be thread safe.
*/
public interface RegionDigraphVisitor {
/**
* Visits the given region and determines whether or not to continue traversing.
*
* @param region the region to visit
* @return <code>true</code> if the traversal is to continue and <code>false</code> otherwise
*/
boolean visit(Region region);
/**
* Prepares to traverse an edge with the given {@link RegionFilter} and determines whether or not to traverse the
* edge.
*
* @param regionFilter the {@link RegionFilter} of the edge to be traversed
* @return <code>true</code> if the edge is to be traversed and <code>false</code> otherwise
*/
boolean preEdgeTraverse(RegionFilter regionFilter);
/**
* This is called after traversing an edge with the given {@link RegionFilter}.
*
* @param regionFilter the {@link RegionFilter} of the edge that has just been traversed
*/
void postEdgeTraverse(RegionFilter regionFilter);
}
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