compat/maven-resolver-provider/src/main/java/org/apache/maven/repository/internal/DefaultVersionRangeResolver.java [137:192]:
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    private Map<String, ArtifactRepository> getVersions(
            RepositorySystemSession session, VersionRangeResult result, VersionRangeRequest request) {
        RequestTrace trace = RequestTrace.newChild(request.getTrace(), request);

        Map<String, ArtifactRepository> versionIndex = new HashMap<>();

        Metadata metadata = new DefaultMetadata(
                request.getArtifact().getGroupId(),
                request.getArtifact().getArtifactId(),
                MAVEN_METADATA_XML,
                Metadata.Nature.RELEASE_OR_SNAPSHOT);

        List<MetadataRequest> metadataRequests =
                new ArrayList<>(request.getRepositories().size());

        metadataRequests.add(new MetadataRequest(metadata, null, request.getRequestContext()));

        for (RemoteRepository repository : request.getRepositories()) {
            MetadataRequest metadataRequest = new MetadataRequest(metadata, repository, request.getRequestContext());
            metadataRequest.setDeleteLocalCopyIfMissing(true);
            metadataRequest.setTrace(trace);
            metadataRequests.add(metadataRequest);
        }

        List<MetadataResult> metadataResults = metadataResolver.resolveMetadata(session, metadataRequests);

        WorkspaceReader workspace = session.getWorkspaceReader();
        if (workspace != null) {
            List<String> versions = workspace.findVersions(request.getArtifact());
            for (String version : versions) {
                versionIndex.put(version, workspace.getRepository());
            }
        }

        for (MetadataResult metadataResult : metadataResults) {
            result.addException(metadataResult.getException());

            ArtifactRepository repository = metadataResult.getRequest().getRepository();
            if (repository == null) {
                repository = session.getLocalRepository();
            }

            Versioning versioning = readVersions(session, trace, metadataResult.getMetadata(), repository, result);

            versioning = filterVersionsByRepositoryType(
                    versioning, metadataResult.getRequest().getRepository());

            for (String version : versioning.getVersions()) {
                if (!versionIndex.containsKey(version)) {
                    versionIndex.put(version, repository);
                }
            }
        }

        return versionIndex;
    }
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impl/maven-impl/src/main/java/org/apache/maven/impl/resolver/DefaultVersionRangeResolver.java [134:189]:
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    private Map<String, ArtifactRepository> getVersions(
            RepositorySystemSession session, VersionRangeResult result, VersionRangeRequest request) {
        RequestTrace trace = RequestTrace.newChild(request.getTrace(), request);

        Map<String, ArtifactRepository> versionIndex = new HashMap<>();

        Metadata metadata = new DefaultMetadata(
                request.getArtifact().getGroupId(),
                request.getArtifact().getArtifactId(),
                MAVEN_METADATA_XML,
                Metadata.Nature.RELEASE_OR_SNAPSHOT);

        List<MetadataRequest> metadataRequests =
                new ArrayList<>(request.getRepositories().size());

        metadataRequests.add(new MetadataRequest(metadata, null, request.getRequestContext()));

        for (RemoteRepository repository : request.getRepositories()) {
            MetadataRequest metadataRequest = new MetadataRequest(metadata, repository, request.getRequestContext());
            metadataRequest.setDeleteLocalCopyIfMissing(true);
            metadataRequest.setTrace(trace);
            metadataRequests.add(metadataRequest);
        }

        List<MetadataResult> metadataResults = metadataResolver.resolveMetadata(session, metadataRequests);

        WorkspaceReader workspace = session.getWorkspaceReader();
        if (workspace != null) {
            List<String> versions = workspace.findVersions(request.getArtifact());
            for (String version : versions) {
                versionIndex.put(version, workspace.getRepository());
            }
        }

        for (MetadataResult metadataResult : metadataResults) {
            result.addException(metadataResult.getException());

            ArtifactRepository repository = metadataResult.getRequest().getRepository();
            if (repository == null) {
                repository = session.getLocalRepository();
            }

            Versioning versioning = readVersions(session, trace, metadataResult.getMetadata(), repository, result);

            versioning = filterVersionsByRepositoryType(
                    versioning, metadataResult.getRequest().getRepository());

            for (String version : versioning.getVersions()) {
                if (!versionIndex.containsKey(version)) {
                    versionIndex.put(version, repository);
                }
            }
        }

        return versionIndex;
    }
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