@Override
public int compare(ServiceReference<T> serviceReference1, ServiceReference<T> serviceReference2) {
if (serviceReference1 == null) {
if (serviceReference2 == null) {
return 0;
} else {
return 1;
}
} else if (serviceReference2 == null) {
return -1;
}
Object propertyValue1 = serviceReference1.getProperty(_propertyKey);
Object propertyValue2 = serviceReference2.getProperty(_propertyKey);
if (propertyValue1 == null) {
if (propertyValue2 == null) {
return 0;
} else {
return 1;
}
} else if (propertyValue2 == null) {
return -1;
}
if (!(propertyValue2 instanceof Comparable)) {
return serviceReference2.compareTo(serviceReference1);
}
Comparable<Object> propertyValueComparable2 = (Comparable<Object>) propertyValue2;
return propertyValueComparable2.compareTo(propertyValue1);
}
private ServiceReference getBestServiceReference(ServiceReference[] refs) {
if (refs == null) {
return null;
}
if (refs.length == 1) {
return refs[0];
}
// Loop through all service references and return
// the "best" one according to its rank and ID.
ServiceReference bestRef = refs[0];
for (int i = 1; i < refs.length; i++) {
if (bestRef.compareTo(refs[i]) < 0) {
bestRef = refs[i];
}
}
return bestRef;
}
private List<Bundle> getBundlesToDestroy(List<Bundle> bundles) {
List<Bundle> bundlesToDestroy = new ArrayList<Bundle>();
for (Bundle bundle : bundles) {
ServiceReference[] references = bundle.getRegisteredServices();
int usage = 0;
if (references != null) {
for (ServiceReference reference : references) {
usage += getServiceUsage(reference, bundles);
}
}
if (usage == 0) {
bundlesToDestroy.add(bundle);
}
}
if (!bundlesToDestroy.isEmpty()) {
Collections.sort(
bundlesToDestroy,
new Comparator<Bundle>() {
public int compare(Bundle b1, Bundle b2) {
return (int) (b2.getLastModified() - b1.getLastModified());
}
});
} else {
ServiceReference ref = null;
for (Bundle bundle : bundles) {
ServiceReference[] references = bundle.getRegisteredServices();
for (ServiceReference reference : references) {
if (getServiceUsage(reference, bundles) == 0) {
continue;
}
if (ref == null || reference.compareTo(ref) < 0) {
ref = reference;
}
}
}
if (ref != null) {
bundlesToDestroy.add(ref.getBundle());
}
}
return bundlesToDestroy;
}