Refactor: Rename Resource#isTypeOf() to isSubTypeOf()

Change-Id: I83eed95d53ecc06cd14695cae22bd4e71646040a

@@ -73,12 +73,12 @@ public final class ContinuousResource implements Resource {
     }
 
     @Override
-    public boolean isTypeOf(Class<?> ancestorType) {
+    public boolean isSubTypeOf(Class<?> ancestor) {
         String typeName = (String) id.components().get(id.components().size() - 1);
-        boolean foundInLeaf = typeName.equals(ancestorType.getCanonicalName());
+        boolean foundInLeaf = typeName.equals(ancestor.getCanonicalName());
         boolean foundInAncestor = id.components().subList(0, id.components().size()).stream()
                 .map(Object::getClass)
-                .filter(x -> x.equals(ancestorType))
+                .filter(x -> x.equals(ancestor))
                 .findAny()
                 .isPresent();
         return foundInAncestor || foundInLeaf;

@@ -63,10 +63,10 @@ public final class DiscreteResource implements Resource {
     }
 
     @Override
-    public boolean isTypeOf(Class<?> ancestorType) {
+    public boolean isSubTypeOf(Class<?> ancestor) {
         return id.components().stream()
                 .map(Object::getClass)
-                .filter(x -> x.equals(ancestorType))
+                .filter(x -> x.equals(ancestor))
                 .findAny()
                 .isPresent();
     }

@@ -48,13 +48,12 @@ public interface Resource {
     ResourceId id();
 
     /**
-     * Checks if the type of this instance is the specified type.
+     * Checks if the type of this instance is the sub-type of the specified type.
      *
-     * @param ancestorType type of resource to be checked.
+     * @param ancestor type of resource to be checked.
      * @return true if this resource is under the resource whose type is the given type.
      */
-    // TODO: find more proper name
-    boolean isTypeOf(Class<?> ancestorType);
+    boolean isSubTypeOf(Class<?> ancestor);
 
     /**
      * Returns the volume of this resource.

@@ -90,18 +90,18 @@ public class ResourceTest {
     }
 
     @Test
-    public void testTypeOf() {
+    public void testSubTypeOf() {
         DiscreteResource discrete = Resources.discrete(D1, P1, VLAN1).resource();
-        assertThat(discrete.isTypeOf(DeviceId.class), is(true));
-        assertThat(discrete.isTypeOf(PortNumber.class), is(true));
-        assertThat(discrete.isTypeOf(VlanId.class), is(true));
-        assertThat(discrete.isTypeOf(Bandwidth.class), is(false));
+        assertThat(discrete.isSubTypeOf(DeviceId.class), is(true));
+        assertThat(discrete.isSubTypeOf(PortNumber.class), is(true));
+        assertThat(discrete.isSubTypeOf(VlanId.class), is(true));
+        assertThat(discrete.isSubTypeOf(Bandwidth.class), is(false));
 
         ContinuousResource continuous = Resources.continuous(D1, P1, Bandwidth.class).resource(BW1.bps());
-        assertThat(continuous.isTypeOf(DeviceId.class), is(true));
-        assertThat(continuous.isTypeOf(PortNumber.class), is(true));
-        assertThat(continuous.isTypeOf(Bandwidth.class), is(true));
-        assertThat(continuous.isTypeOf(VlanId.class), is(false));
+        assertThat(continuous.isSubTypeOf(DeviceId.class), is(true));
+        assertThat(continuous.isSubTypeOf(PortNumber.class), is(true));
+        assertThat(continuous.isSubTypeOf(Bandwidth.class), is(true));
+        assertThat(continuous.isSubTypeOf(VlanId.class), is(false));
     }
 
     @Test

@@ -302,7 +302,7 @@ public class ObjectiveTracker implements ObjectiveTrackerService {
     private class InternalResourceListener implements ResourceListener {
         @Override
         public void event(ResourceEvent event) {
-            if (event.subject().isTypeOf(PortNumber.class)) {
+            if (event.subject().isSubTypeOf(PortNumber.class)) {
                 executorService.execute(() -> {
                     if (delegate == null) {
                         return;