/*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.aries.subsystem.core.internal;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import org.osgi.framework.wiring.BundleRevision;
import org.osgi.namespace.service.ServiceNamespace;
import org.osgi.resource.Capability;
import org.osgi.resource.Requirement;
import org.osgi.resource.Resource;
public class BundleRevisionResource implements Resource {
private final BundleRevision revision;
public BundleRevisionResource(BundleRevision revision) {
if (revision == null)
throw new NullPointerException();
this.revision = revision;
}
@Override
public List<Capability> getCapabilities(String namespace) {
if (ServiceNamespace.SERVICE_NAMESPACE.equals(namespace)) {
return Collections.unmodifiableList(getServiceCapabilities());
}
List<Capability> revisionCapabilities = revision.getCapabilities(namespace);
if (namespace == null) {
List<Capability> serviceCapabilities = getServiceCapabilities();
List<Capability> result = new ArrayList<Capability>(revisionCapabilities.size() + serviceCapabilities.size());
result.addAll(revisionCapabilities);
result.addAll(serviceCapabilities);
return Collections.unmodifiableList(result);
}
return revisionCapabilities;
}
@Override
public List<Requirement> getRequirements(String namespace) {
if (ServiceNamespace.SERVICE_NAMESPACE.equals(namespace)) {
return Collections.unmodifiableList(getServiceRequirements());
}
List<Requirement> revisionRequirements = revision.getRequirements(namespace);
if (namespace == null) {
List<Requirement> serviceRequirements = getServiceRequirements();
List<Requirement> result = new ArrayList<Requirement>(revisionRequirements.size() + serviceRequirements.size());
result.addAll(revisionRequirements);
result.addAll(serviceRequirements);
return Collections.unmodifiableList(result);
}
return revisionRequirements;
}
public BundleRevision getRevision() {
return revision;
}
private ServiceModeller.ServiceModel getModel() {
Activator activator = Activator.getInstance();
ServiceModeller modeller = activator.getServiceModeller();
if (modeller == null) {
return null;
}
ServiceModeller.ServiceModel model = modeller.computeRequirementsAndCapabilities(this,
new BundleDirectory(revision.getBundle()));
return model;
}
private boolean initialized;
private List<Capability> serviceCapabilities;
private List<Requirement> serviceRequirements;
private synchronized void computeServiceCapabilitiesAndRequirements() {
ServiceModeller.ServiceModel model = null;
boolean gotModel = false;
List<Capability> capabilities = revision.getCapabilities(ServiceNamespace.SERVICE_NAMESPACE);
// OSGi RFC 201 for R6: The presence of any Provide-Capability clauses
// in the osgi.service namespace overrides any service related
// capabilities that might have been found by other means.
if (capabilities.isEmpty()) {
model = getModel();
gotModel = true;
if (model != null) {
capabilities = model.getServiceCapabilities();
}
}
serviceCapabilities = capabilities;
List<Requirement> requirements = revision.getRequirements(ServiceNamespace.SERVICE_NAMESPACE);
// OSGi RFC 201 for R6: The presence of any Require-Capability clauses
// in the osgi.service namespace overrides any service related
// requirements that might have been found by other means.
if (requirements.isEmpty()) {
if (model == null && !gotModel) {
model = getModel();
}
if (model != null) {
requirements = model.getServiceRequirements();
}
}
serviceRequirements = requirements;
initialized = true;
}
private synchronized List<Capability> getServiceCapabilities() {
if (!initialized) {
computeServiceCapabilitiesAndRequirements();
}
return serviceCapabilities;
}
private synchronized List<Requirement> getServiceRequirements() {
if (!initialized) {
computeServiceCapabilitiesAndRequirements();
}
return serviceRequirements;
}
}