| /******************************************************************************* |
| * Copyright (c) 2011 VMware Inc. |
| * |
| * 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: |
| * 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); |
| |
| } |