| /******************************************************************************* |
| * 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: |
| * VMware Inc. - initial contribution |
| *******************************************************************************/ |
| |
| package org.eclipse.equinox.internal.region.hook; |
| |
| import org.eclipse.equinox.region.*; |
| |
| import java.util.Collection; |
| import org.osgi.framework.Bundle; |
| import org.osgi.framework.BundleContext; |
| import org.osgi.framework.hooks.bundle.FindHook; |
| |
| /** |
| * {@link RegionBundleFindHook} manages the visibility of bundles across regions according to the {@link RegionDigraph}. |
| * <p /> |
| * |
| * <strong>Concurrent Semantics</strong><br /> |
| * Thread safe. |
| */ |
| public final class RegionBundleFindHook implements FindHook { |
| |
| private final RegionDigraph regionDigraph; |
| |
| private final long hookImplID; |
| |
| public RegionBundleFindHook(RegionDigraph regionDigraph, long hookImplID) { |
| this.regionDigraph = regionDigraph; |
| this.hookImplID = hookImplID; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public void find(BundleContext context, Collection<Bundle> bundles) { |
| long bundleID = context.getBundle().getBundleId(); |
| |
| if (bundleID == 0 || bundleID == hookImplID) { |
| // The system bundle and the hook impl bundle can see all bundles |
| return; |
| } |
| |
| Region finderRegion = getRegion(context); |
| if (finderRegion == null) { |
| bundles.clear(); |
| return; |
| } |
| |
| Visitor visitor = new Visitor(bundles); |
| finderRegion.visitSubgraph(visitor); |
| Collection<Bundle> allowed = visitor.getAllowed(); |
| |
| bundles.retainAll(allowed); |
| } |
| |
| private class Visitor extends RegionDigraphVisitorBase<Bundle> { |
| |
| private Visitor(Collection<Bundle> candidates) { |
| super(candidates); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| protected boolean contains(Region region, Bundle candidate) { |
| return region.contains(candidate); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| protected boolean isAllowed(Bundle candidate, RegionFilter filter) { |
| return filter.isAllowed(candidate); |
| } |
| |
| } |
| |
| private Region getRegion(BundleContext context) { |
| return this.regionDigraph.getRegion(context.getBundle()); |
| } |
| } |