Change hasEnoughResource() to instance method from static method

Change-Id: Ib6de1bfc2b7e65677c3685ac3c2f51391204d9cf

@@ -39,7 +39,6 @@ import java.util.stream.Stream;
 import static org.onosproject.store.resource.impl.ConsistentResourceStore.MAX_RETRIES;
 import static org.onosproject.store.resource.impl.ConsistentResourceStore.RETRY_DELAY;
 import static org.onosproject.store.resource.impl.ConsistentResourceStore.SERIALIZER;
-import static org.onosproject.store.resource.impl.ContinuousResourceAllocation.hasEnoughResource;
 
 class ConsistentContinuousResourceSubStore {
     private ConsistentMap<ContinuousResourceId, ContinuousResourceAllocation> consumers;
@@ -108,7 +107,7 @@ class ConsistentContinuousResourceSubStore {
             return true;
         }
 
-        return hasEnoughResource(allocation.value().original(), resource, allocation.value());
+        return allocation.value().hasEnoughResource(allocation.value().original(), resource);
     }
 
     <T> Stream<ContinuousResource> getAllocatedResources(DiscreteResourceId parent, Class<T> cls) {

@@ -30,6 +30,10 @@ final class ContinuousResourceAllocation {
     private final ContinuousResource original;
     private final ImmutableList<ResourceAllocation> allocations;
 
+    static ContinuousResourceAllocation empty(ContinuousResource original) {
+        return new ContinuousResourceAllocation(original, ImmutableList.of());
+    }
+
     ContinuousResourceAllocation(ContinuousResource original,
                                  ImmutableList<ResourceAllocation> allocations) {
         this.original = original;
@@ -42,18 +46,11 @@ final class ContinuousResourceAllocation {
      *
      * @param original   original resource
      * @param request    requested resource
-     * @param allocation current allocation of the resource
      * @return true if there is enough resource volume. Otherwise, false.
      */
     // computational complexity: O(n) where n is the number of allocations
-    static boolean hasEnoughResource(ContinuousResource original,
-                                     ContinuousResource request,
-                                     ContinuousResourceAllocation allocation) {
-        if (allocation == null) {
-            return request.value() <= original.value();
-        }
-
-        double allocated = allocation.allocations().stream()
+    boolean hasEnoughResource(ContinuousResource original, ContinuousResource request) {
+        double allocated = allocations.stream()
                 .filter(x -> x.resource() instanceof ContinuousResource)
                 .map(x -> (ContinuousResource) x.resource())
                 .mapToDouble(ContinuousResource::value)

@@ -35,7 +35,6 @@ import java.util.stream.Collectors;
 
 import static com.google.common.base.Preconditions.checkArgument;
 import static org.onosproject.store.resource.impl.ConsistentResourceStore.SERIALIZER;
-import static org.onosproject.store.resource.impl.ContinuousResourceAllocation.hasEnoughResource;
 
 class TransactionalContinuousResourceSubStore {
     private final Logger log = LoggerFactory.getLogger(getClass());
@@ -140,7 +139,9 @@ class TransactionalContinuousResourceSubStore {
         // Down cast: this must be safe as ContinuousResource is associated with ContinuousResourceId
         ContinuousResource original = lookedUp.get();
         ContinuousResourceAllocation allocations = consumers.get(request.id());
-        if (!hasEnoughResource(original, request, allocations)) {
+        if (!Optional.ofNullable(allocations)
+                .orElse(ContinuousResourceAllocation.empty(original))
+                .hasEnoughResource(original, request)) {
             return false;
         }