| /******************************************************************************* |
| * Copyright (c) 2015, 2016 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 java.util.Collection; |
| import org.eclipse.equinox.region.*; |
| import org.osgi.framework.*; |
| import org.osgi.framework.hooks.service.FindHook; |
| |
| /** |
| * {@link RegionServiceFindHook} manages the visibility of services across regions according to the |
| * {@link RegionDigraph}. |
| * <p /> |
| * |
| * <strong>Concurrent Semantics</strong><br /> |
| * Thread safe. |
| */ |
| public final class RegionServiceFindHook implements FindHook { |
| |
| private final RegionDigraph regionDigraph; |
| |
| public RegionServiceFindHook(RegionDigraph regionDigraph) { |
| this.regionDigraph = regionDigraph; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public void find(BundleContext context, String name, String filter, boolean allServices, Collection<ServiceReference<?>> references) { |
| Bundle finderBundle = RegionBundleFindHook.getBundle(context); |
| if (finderBundle == null) { |
| // invalid finder bundle; clear out result |
| references.clear(); |
| return; |
| } |
| if (finderBundle.getBundleId() == 0L) { |
| return; |
| } |
| |
| Region finderRegion = this.regionDigraph.getRegion(finderBundle); |
| RegionServiceFindHook.find(finderRegion, references); |
| } |
| |
| static void find(Region finderRegion, Collection<ServiceReference<?>> references) { |
| if (finderRegion == null) { |
| references.clear(); |
| return; |
| } |
| |
| Visitor visitor = new Visitor(references); |
| finderRegion.visitSubgraph(visitor); |
| Collection<ServiceReference<?>> allowed = visitor.getAllowed(); |
| |
| references.retainAll(allowed); |
| } |
| |
| static class Visitor extends RegionDigraphVisitorBase<ServiceReference<?>> { |
| |
| Visitor(Collection<ServiceReference<?>> candidates) { |
| super(candidates); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| protected boolean contains(Region region, ServiceReference<?> candidate) { |
| Bundle b = candidate.getBundle(); |
| return b == null ? false : region.contains(b); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| protected boolean isAllowed(ServiceReference<?> candidate, RegionFilter filter) { |
| return filter.isAllowed(candidate) || filter.isAllowed(candidate.getBundle()); |
| } |
| |
| } |
| } |