Hide underlying components from public use

- Remove components() method from Resource
- Add isTypeOf() method to Resource

Change-Id: I390eb6057fc7e2c3e93eb2a18d161f661ad6c180

@@ -18,7 +18,6 @@ package org.onosproject.net.newresource;
 import com.google.common.annotations.Beta;
 import com.google.common.base.MoreObjects;
 
-import java.util.List;
 import java.util.Objects;
 import java.util.Optional;
 
@@ -74,8 +73,15 @@ public final class ContinuousResource implements Resource {
     }
 
     @Override
-    public List<Object> components() {
-        return id.components();
+    public boolean isTypeOf(Class<?> ancestorType) {
+        String typeName = (String) id.components().get(id.components().size() - 1);
+        boolean foundInLeaf = typeName.equals(ancestorType.getCanonicalName());
+        boolean foundInAncestor = id.components().subList(0, id.components().size()).stream()
+                .map(Object::getClass)
+                .filter(x -> x.equals(ancestorType))
+                .findAny()
+                .isPresent();
+        return foundInAncestor || foundInLeaf;
     }
 
     @Override

@@ -18,7 +18,6 @@ package org.onosproject.net.newresource;
 import com.google.common.annotations.Beta;
 import com.google.common.base.MoreObjects;
 
-import java.util.List;
 import java.util.Objects;
 import java.util.Optional;
 
@@ -64,8 +63,12 @@ public final class DiscreteResource implements Resource {
     }
 
     @Override
-    public List<Object> components() {
-        return id.components();
+    public boolean isTypeOf(Class<?> ancestorType) {
+        return id.components().stream()
+                .map(Object::getClass)
+                .filter(x -> x.equals(ancestorType))
+                .findAny()
+                .isPresent();
     }
 
     @Override

@@ -17,7 +17,6 @@ package org.onosproject.net.newresource;
 
 import com.google.common.annotations.Beta;
 
-import java.util.List;
 import java.util.Optional;
 
 /**
@@ -42,11 +41,13 @@ public interface Resource {
     DiscreteResource ROOT = new DiscreteResource();
 
     /**
-     * Returns the components of this resource.
+     * Checks if the type of this instance is the specified type.
      *
-     * @return the components of this resource
+     * @param ancestorType type of resource to be checked.
+     * @return true if this resource is under the resource whose type is the given type.
      */
-    List<Object> components();
+    // TODO: find more proper name
+    boolean isTypeOf(Class<?> ancestorType);
 
     /**
      * Returns the volume of this resource.

@@ -24,7 +24,6 @@ import org.onosproject.net.PortNumber;
 
 import java.util.Optional;
 
-import static org.hamcrest.Matchers.contains;
 import static org.hamcrest.Matchers.is;
 import static org.junit.Assert.assertThat;
 
@@ -53,13 +52,6 @@ public class ResourceTest {
     }
 
     @Test
-    public void testComponents() {
-        Resource port = Resources.discrete(D1, P1).resource();
-
-        assertThat(port.components(), contains(D1, P1));
-    }
-
-    @Test
     public void testIdEquality() {
         ResourceId id1 = Resources.discrete(D1, P1, VLAN1).id();
         ResourceId sameAsId1 = Resources.discrete(D1, P1, VLAN1).id();
@@ -98,6 +90,21 @@ public class ResourceTest {
     }
 
     @Test
+    public void testTypeOf() {
+        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));
+
+        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));
+    }
+
+    @Test
     public void testBase() {
         Resource resource = Resources.discrete(D1).resource();
 

@@ -61,7 +61,6 @@ import java.util.Collection;
 import java.util.Collections;
 import java.util.HashSet;
 import java.util.List;
-import java.util.Optional;
 import java.util.Set;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
@@ -303,11 +302,7 @@ public class ObjectiveTracker implements ObjectiveTrackerService {
     private class InternalResourceListener implements ResourceListener {
         @Override
         public void event(ResourceEvent event) {
-            Optional<Class<?>> deviceEvent = event.subject().components().stream()
-                    .map(Object::getClass)
-                    .filter(x -> x == PortNumber.class)
-                    .findFirst();
-            if (deviceEvent.isPresent()) {
+            if (event.subject().isTypeOf(PortNumber.class)) {
                 executorService.execute(() -> {
                     if (delegate == null) {
                         return;