Package org.osgi.framework.resource

Examples of org.osgi.framework.resource.Capability


    }

    private Bundle installSupportBundle(BundleContext context, ModuleIdentifier moduleid) throws BundleException {
        Repository repository = getRepository(context);
        Requirement req = XRequirementBuilder.createArtifactRequirement(moduleid);
        Capability cap = repository.findProviders(req).iterator().next();
        URL location = (URL) cap.getAttributes().get(XResourceConstants.CONTENT_URL);
        return context.installBundle(location.toExternalForm());
    }
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        }
        // Get candidates hosts and keep any that have been populated.
        SortedSet<Capability> hosts = env.findProviders(hostReq);
        for (Iterator<Capability> it = hosts.iterator(); it.hasNext(); )
        {
            Capability host = it.next();
            if (!isPopulated(host.getResource()))
            {
                it.remove();
            }
        }
        // If there aren't any populated hosts, then we can just
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        ResolutionException rethrow = null;
        Set<Capability> fragmentCands = null;
        for (Iterator<Capability> itCandCap = candidates.iterator();
            itCandCap.hasNext(); )
        {
            Capability candCap = itCandCap.next();

            boolean isFragment = Util.isFragment(candCap.getResource());

            // If the capability is from a fragment, then record it
            // because we have to insert associated host capabilities
            // if the fragment is already attached to any hosts.
            if (isFragment)
            {
                if (fragmentCands == null)
                {
                    fragmentCands = new HashSet<Capability>();
                }
                fragmentCands.add(candCap);
            }

            // If the candidate revision is a fragment, then always attempt
            // to populate candidates for its dependency, since it must be
            // attached to a host to be used. Otherwise, if the candidate
            // revision is not already resolved and is not the current version
            // we are trying to populate, then populate the candidates for
            // its dependencies as well.
            // NOTE: Technically, we don't have to check to see if the
            // candidate revision is equal to the current revision, but this
            // saves us from recursing and also simplifies exceptions messages
            // since we effectively chain exception messages for each level
            // of recursion; thus, any avoided recursion results in fewer
            // exceptions to chain when an error does occur.
            if (isFragment
                || (!env.getWirings().containsKey(candCap.getResource())
                    && !candCap.getResource().equals(resource)))
            {
                try
                {
                    populateRevision(env, candCap.getResource());
                }
                catch (ResolutionException ex)
                {
                    if (rethrow == null)
                    {
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        List<Resource> unselectedFragments = new ArrayList<Resource>();
        for (Entry<Capability, Map<String, Map<Version, List<Requirement>>>>
            hostEntry : hostFragments.entrySet())
        {
            // Step 1
            Capability hostCap = hostEntry.getKey();
            Map<String, Map<Version, List<Requirement>>> fragments
                = hostEntry.getValue();
            List<Resource> selectedFragments = new ArrayList<Resource>();
            for (Entry<String, Map<Version, List<Requirement>>> fragEntry
                : fragments.entrySet())
            {
                boolean isFirst = true;
                for (Entry<Version, List<Requirement>> versionEntry
                    : fragEntry.getValue().entrySet())
                {
                    for (Requirement hostReq : versionEntry.getValue())
                    {
                        // Selecting the first fragment in each entry, which
                        // is equivalent to selecting the highest version of
                        // each fragment with a given symbolic name.
                        if (isFirst)
                        {
                            selectedFragments.add(hostReq.getResource());
                            isFirst = false;
                        }
                        // For any fragment that wasn't selected, remove the
                        // current host as a potential host for it and remove it
                        // as a dependent on the host. If there are no more
                        // potential hosts for the fragment, then mark it as
                        // unselected for later removal.
                        else
                        {
                            m_dependentMap.get(hostCap).remove(hostReq);
                            SortedSet<Capability> hosts = m_candidateMap.get(hostReq);
                            hosts.remove(hostCap);
                            if (hosts.isEmpty())
                            {
                                unselectedFragments.add(hostReq.getResource());
                            }
                        }
                    }
                }
            }

            // Step 2
            HostResource wrappedHost =
                new HostResource(hostCap.getResource(), selectedFragments);
            hostRevisions.add(wrappedHost);
            m_allWrappedHosts.put(hostCap.getResource(), wrappedHost);
        }

        // Step 3
        for (Resource frag : unselectedFragments)
        {
            removeRevision(frag,
                new ResolutionException(
                    "Fragment was not selected for attachment: " + frag));
        }

        // Step 4
        for (HostResource hostRevision : hostRevisions)
        {
            // Replaces capabilities from fragments with the capabilities
            // from the merged host.
            for (Capability c : hostRevision.getCapabilities(null))
            {
                // Don't replace the host capability, since the fragment will
                // really be attached to the original host, not the wrapper.
                if (!c.getNamespace().equals(ResourceConstants.WIRING_HOST_NAMESPACE))
                {
                    Capability origCap =
                        ((HostedCapability) c).getOriginalCapability();
                    // Note that you might think we could remove the original cap
                    // from the dependent map, but you can't since it may come from
                    // a fragment that is attached to multiple hosts, so each host
                    // will need to make their own copy.
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                {
                    r = new HostedRequirement(wire.getRequirer(), r);
                }
                // Wrap the capability as a hosted capability if it comes
                // from a fragment, since we will need to know the host.
                Capability c = wire.getCapability();
                if (!c.getResource().equals(wire.getProvider()))
                {
                    c = new HostedCapability(wire.getProvider(), c);
                }
                reqs.add(r);
                caps.add(c);
            }

            // Since the revision is resolved, it could be dynamically importing,
            // so check to see if there are candidates for any of its dynamic
            // imports.
            for (Requirement req
                : Util.getDynamicRequirements(wiring.getResourceRequirements(null)))
            {
                // Get the candidates for the current requirement.
                SortedSet<Capability> candCaps = allCandidates.getCandidates(req);
                // Optional requirements may not have any candidates.
                if (candCaps == null)
                {
                    continue;
                }

                Capability cap = candCaps.iterator().next();
                reqs.add(req);
                caps.add(cap);
                isDynamicImporting = true;
                // Can only dynamically import one at a time, so break
                // out of the loop after the first.
                break;
            }
        }
        else
        {
            for (Requirement req : resource.getRequirements(null))
            {
                String resolution = req.getDirectives()
                    .get(ResourceConstants.REQUIREMENT_RESOLUTION_DIRECTIVE);
// TODO: RFC-112 - Need dynamic constant.
                if ((resolution == null) || !resolution.equals("dynamic"))
                {
                    // Get the candidates for the current requirement.
                    SortedSet<Capability> candCaps = allCandidates.getCandidates(req);
                    // Optional requirements may not have any candidates.
                    if (candCaps == null)
                    {
                        continue;
                    }

                    Capability cap = candCaps.iterator().next();
                    reqs.add(req);
                    caps.add(cap);
                }
            }
        }

        // First, add all exported packages to the target revision's package space.
        calculateExportedPackages(env, resource, allCandidates, revisionPkgMap);
        Packages revisionPkgs = revisionPkgMap.get(resource);

        // Second, add all imported packages to the target revision's package space.
        for (int i = 0; i < reqs.size(); i++)
        {
            Requirement req = reqs.get(i);
            Capability cap = caps.get(i);
            calculateExportedPackages(env, cap.getResource(), allCandidates, revisionPkgMap);
            mergeCandidatePackages(
                env, resource, req, cap, revisionPkgMap, allCandidates,
                new HashMap<Resource, List<Capability>>());
        }

        // Third, have all candidates to calculate their package spaces.
        for (int i = 0; i < caps.size(); i++)
        {
            calculatePackageSpaces(
                env, caps.get(i).getResource(), allCandidates, revisionPkgMap,
                usesCycleMap, cycle);
        }

        // Fourth, if the target revision is unresolved or is dynamically importing,
        // then add all the uses constraints implied by its imported and required
        // packages to its package space.
        // NOTE: We do not need to do this for resolved revisions because their
        // package space is consistent by definition and these uses constraints
        // are only needed to verify the consistency of a resolving revision. The
        // only exception is if a resolved revision is dynamically importing, then
        // we need to calculate its uses constraints again to make sure the new
        // import is consistent with the existing package space.
        if ((wiring == null) || isDynamicImporting)
        {
            // Merge uses constraints from required capabilities.
            for (int i = 0; i < reqs.size(); i++)
            {
                Requirement req = reqs.get(i);
                Capability cap = caps.get(i);
                // Ignore bundle/package requirements, since they are
                // considered below.
                if (!req.getNamespace().equals(ResourceConstants.WIRING_BUNDLE_NAMESPACE)
                    && !req.getNamespace().equals(ResourceConstants.WIRING_PACKAGE_NAMESPACE))
                {
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            for (Requirement req : resource.getRequirements(null))
            {
                SortedSet<Capability> cands = allCandidates.getCandidates(req);
                if ((cands != null) && (cands.size() > 0))
                {
                    Capability cand = cands.iterator().next();
                    // Ignore revisions that import themselves.
                    if (!resource.equals(cand.getResource()))
                    {
                        if (!env.getWirings().containsKey(cand.getResource()))
                        {
                            populateWireMap(env, cand.getResource(),
                                revisionPkgMap, wireMap, allCandidates);
                        }
                        Packages candPkgs = revisionPkgMap.get(cand.getResource());
                        Wire wire = new WireImpl(
                            unwrappedResource,
                            getActualRequirement(req),
                            getActualResource(cand.getResource()),
                            getActualCapability(cand));
                        if (req.getNamespace().equals(ResourceConstants.WIRING_PACKAGE_NAMESPACE))
                        {
                            packageWires.add(wire);
                        }
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        List<Wire> packageWires = new ArrayList<Wire>();

        // Get the candidates for the current dynamic requirement.
        SortedSet<Capability> candCaps = allCandidates.getCandidates(dynReq);
        // Record the dynamic candidate.
        Capability dynCand = candCaps.first();

        if (!env.getWirings().containsKey(dynCand.getResource()))
        {
            populateWireMap(env, dynCand.getResource(), revisionPkgMap,
                wireMap, allCandidates);
        }

        packageWires.add(
            new WireImpl(
                resource,
                dynReq,
                getActualResource(dynCand.getResource()),
                getActualCapability(dynCand)));

        wireMap.put(resource, packageWires);

        return wireMap;
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                {
                    sb.append("\n    provide: ");
                }
                if ((i + 1) < blame.m_reqs.size())
                {
                    Capability cap = Util.getSatisfyingCapability(
                        env,
                        blame.m_reqs.get(i + 1).getResource(),
                        blame.m_reqs.get(i));
                    if (cap.getNamespace().equals(ResourceConstants.WIRING_PACKAGE_NAMESPACE))
                    {
                        sb.append(ResourceConstants.WIRING_PACKAGE_NAMESPACE);
                        sb.append("=");
                        sb.append(cap.getAttributes()
                            .get(ResourceConstants.WIRING_PACKAGE_NAMESPACE).toString());
                        Capability usedCap;
                        if ((i + 2) < blame.m_reqs.size())
                        {
                            usedCap = Util.getSatisfyingCapability(
                                env,
                                blame.m_reqs.get(i + 2).getResource(),
                                blame.m_reqs.get(i + 1));
                        }
                        else
                        {
                            usedCap = Util.getSatisfyingCapability(
                                env,
                                blame.m_cap.getResource(),
                                blame.m_reqs.get(i + 1));
                        }
                        sb.append("; uses:=");
                        sb.append(usedCap.getAttributes()
                            .get(ResourceConstants.WIRING_PACKAGE_NAMESPACE));
                    }
                    else
                    {
                        sb.append(cap);
                    }
                    sb.append("\n");
                }
                else
                {
                    Capability export = Util.getSatisfyingCapability(
                        env,
                        blame.m_cap.getResource(),
                        blame.m_reqs.get(i));
                    sb.append(export.getNamespace());
                    sb.append("=");
                    sb.append(export.getAttributes().get(export.getNamespace()).toString());
                    if (export.getNamespace().equals(ResourceConstants.WIRING_PACKAGE_NAMESPACE)
                        && !export.getAttributes().get(ResourceConstants.WIRING_PACKAGE_NAMESPACE)
                            .equals(blame.m_cap.getAttributes().get(
                                ResourceConstants.WIRING_PACKAGE_NAMESPACE)))
                    {
                        sb.append("; uses:=");
                        sb.append(blame.m_cap.getAttributes()
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        return null;
    }

    public static boolean isFragment(Resource resource)
    {
        Capability icap = resource.getCapabilities(ResourceConstants.IDENTITY_NAMESPACE).get(0);
        String type = (String) icap.getAttributes().get(ResourceConstants.IDENTITY_TYPE_ATTRIBUTE);
        return ResourceConstants.IDENTITY_TYPE_FRAGMENT.equals(type);
    }
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Related Classes of org.osgi.framework.resource.Capability

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