how to get streams by project area using OSLC API/programatically

. get a handle to project area

This is how I get all streams in a given project area using plain Java API:

IProjectArea projectArea = ...;
String repositoryURI = "https://myserver.jazz.com:9443/jts";
ITeamRepository teamRepository = TeamPlatform.getTeamRepositoryService().getTeamRepository(repositoryURI);
IWorkspaceManager workspaceManager = (IWorkspaceManager) teamRepository.getClientLibrary(IWorkspaceManager.class);
List<IWorkspace> streams = new ArrayList<IWorkspace>();

IWorkspaceSearchCriteria workspaceSearchCriteria = IWorkspaceSearchCriteria.FACTORY.newInstance();
workspaceSearchCriteria.setKind(IWorkspaceSearchCriteria.STREAMS);
try {
List<IWorkspaceHandle> workspaceHandles = workspaceManager.findWorkspaces(workspaceSearchCriteria, Integer.MAX_VALUE, null);
for (IWorkspaceHandle workspaceHandle : workspaceHandles) {
IWorkspaceConnection workspaceConnection = workspaceManager.getWorkspaceConnection(workspaceHandle, null);
IProcessAreaHandle wsProcessAreaHandle = workspaceConnection.getProcessArea(null);
if (wsProcessAreaHandle != null) {
String wsProcessAreaHandleUUID = wsProcessAreaHandle.getItemId().getUuidValue();
if (wsProcessAreaHandleUUID.equals(projectArea.getItemId().getUuidValue())) {
IWorkspace stream = (IWorkspace) teamRepository.itemManager().fetchCompleteItem(workspaceHandle, IItemManager.DEFAULT, null);
streams.add(stream);
}
}
}
} catch (TeamRepositoryException e) {
e.printStackTrace();
}

public static final String CONFIGUTATION_MANAGEMENT_DOMAIN    = "http://open-services.net/ns/config#"; public static final String CONFIGUTATION_MANAGEMENT_PREFIX  = "oslc_config";
public static final String CONFIGURATION  = CONFIGUTATION_MANAGEMENT_DOMAIN + "Configuration";
public static final String JAZZ_PROCESS_MANAGMENT_DOMAIN   = "http://jazz.net/ns/process#";
@OslcNamespace(CONFIGUTATION_MANAGEMENT_DOMAIN)
@OslcResourceShape(title = "Stream Resource Shape", describes = CONFIGURATION)

public class Configuration extends AbstractResource {
    
    private String     title;
    private URI          serviceProvider;
    private URI          projectArea;
    private URI     baselines;
    private URI        component;
    
    private final Set<URI>      rdfTypes                    = new TreeSet<URI>();

    public Configuration() {
        
        super();
        
    }
    
    public Configuration(final URI about) {
        
        super(about);
        
    }
    
    public void addRdfType(final URI rdfType)
    {
        this.rdfTypes.add(rdfType);
    }
    
    @OslcDescription("Title (reference: Dublin Core) or often a single line summary of the resource represented as rich text in XHTML content.")
    @OslcOccurs(Occurs.ExactlyOne)
    @OslcPropertyDefinition(OslcConstants.DCTERMS_NAMESPACE + "title")
    @OslcTitle("Title")
    @OslcValueType(ValueType.XMLLiteral)
    public String getTitle()
    {
        return title;
    }
    
    @OslcDescription("The scope of a resource is a URI for the resource's OSLC Service Provider.")
    @OslcPropertyDefinition(OslcConstants.OSLC_CORE_NAMESPACE + "serviceProvider")
    @OslcRange(OslcConstants.TYPE_SERVICE_PROVIDER)
    @OslcTitle("Service Provider")
    public URI getServiceProvider()
    {
        return serviceProvider;
    }
    
    @OslcDescription("The scope of a resource is a URI for the resource's baselines.")
    @OslcPropertyDefinition(CONFIGUTATION_MANAGEMENT_DOMAIN + "baselines")
    @OslcTitle("Baselines")
    public URI getBaselines()
    {
        return this.baselines;
    }
    
    @OslcDescription("The scope of a resource is a URI for the resource's baselines.")
    @OslcPropertyDefinition(CONFIGUTATION_MANAGEMENT_DOMAIN + "component")
    @OslcTitle("Component")
    public URI getComponent()
    {
        return this.component;
    }
    
    @OslcDescription("The scope of a resource is a URI for the resource's project area.")
    @OslcPropertyDefinition(JAZZ_PROCESS_MANAGMENT_DOMAIN + "projectArea")
    @OslcTitle("Project Area")
    public URI getProjectArea()
    {
        return this.projectArea;
    }
    
    @OslcDescription("The resource type URIs.")
    @OslcName("type")
    @OslcPropertyDefinition(OslcConstants.RDF_NAMESPACE + "type")
    @OslcTitle("Types")
    public URI[] getRdfTypes()
    {
        return rdfTypes.toArray(new URI[rdfTypes.size()]);
    }
    
    public void setTitle(final String title)
    {
        this.title = title;
    }
    
    public void setServiceProvider(final URI serviceProvider)
    {
        this.serviceProvider = serviceProvider;
    }
    
    public void setBaselines(final URI baselines)
    {
        this.baselines = baselines;
    }
    
    public void setComponent(final URI component)
    {
        this.component = component;
    }
    
    public void setProjectArea(final URI projectArea)
    {
        this.projectArea = projectArea;
    }
    
    public void setRdfTypes(final URI[] rdfTypes)
    {
        this.rdfTypes.clear();
        if (rdfTypes != null)
        {
            this.rdfTypes.addAll(Arrays.asList(rdfTypes));
        }
    }
}