Refactor: Rename ResourcePath to Resource for a better name

Also the followings
- Rename variables from path to resource
- Update Javadoc

Change-Id: I07da7e7d13882f2134a3687c66ed91a9de5b0849
diff --git a/core/api/src/test/java/org/onosproject/net/newresource/ResourceTest.java b/core/api/src/test/java/org/onosproject/net/newresource/ResourceTest.java
new file mode 100644
index 0000000..dd4432d
--- /dev/null
+++ b/core/api/src/test/java/org/onosproject/net/newresource/ResourceTest.java
@@ -0,0 +1,107 @@
+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * 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.onosproject.net.newresource;
+
+import com.google.common.testing.EqualsTester;
+import org.junit.Test;
+import org.onlab.packet.VlanId;
+import org.onlab.util.Bandwidth;
+import org.onosproject.net.DeviceId;
+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;
+
+public class ResourceTest {
+
+    private static final DeviceId D1 = DeviceId.deviceId("of:001");
+    private static final DeviceId D2 = DeviceId.deviceId("of:002");
+    private static final PortNumber P1 = PortNumber.portNumber(1);
+    private static final VlanId VLAN1 = VlanId.vlanId((short) 100);
+    private static final Bandwidth BW1 = Bandwidth.gbps(2);
+    private static final Bandwidth BW2 = Bandwidth.gbps(1);
+
+    @Test
+    public void testEquals() {
+        Resource resource1 = Resource.discrete(D1, P1, VLAN1);
+        Resource sameAsResource1 = Resource.discrete(D1, P1, VLAN1);
+        Resource resource2 = Resource.discrete(D2, P1, VLAN1);
+        Resource resource3 = Resource.continuous(BW1.bps(), D1, P1, BW1);
+        Resource sameAsResource3 = Resource.continuous(BW1.bps(), D1, P1, BW1);
+
+        new EqualsTester()
+                .addEqualityGroup(resource1, sameAsResource1)
+                .addEqualityGroup(resource2)
+                .addEqualityGroup(resource3, sameAsResource3)
+                .testEquals();
+    }
+
+    @Test
+    public void testComponents() {
+        Resource port = Resource.discrete(D1, P1);
+
+        assertThat(port.components(), contains(D1, P1));
+    }
+
+    @Test
+    public void testIdEquality() {
+        ResourceId id1 = Resource.discrete(D1, P1, VLAN1).id();
+        ResourceId sameAsId1 = Resource.discrete(D1, P1, VLAN1).id();
+        ResourceId id2 = Resource.discrete(D2, P1, VLAN1).id();
+        ResourceId id3 = Resource.continuous(BW1.bps(), D1, P1, BW1).id();
+        // intentionally set a different value
+        ResourceId sameAsId3 = Resource.continuous(BW2.bps(), D1, P1, BW1).id();
+
+        new EqualsTester()
+                .addEqualityGroup(id1, sameAsId1)
+                .addEqualityGroup(id2)
+                .addEqualityGroup(id3, sameAsId3);
+    }
+
+    @Test
+    public void testChild() {
+        Resource r1 = Resource.discrete(D1).child(P1);
+        Resource sameAsR2 = Resource.discrete(D1, P1);
+
+        assertThat(r1, is(sameAsR2));
+    }
+
+    @Test
+    public void testThereIsParent() {
+        Resource resource = Resource.discrete(D1, P1, VLAN1);
+        Resource parent = Resource.discrete(D1, P1);
+
+        assertThat(resource.parent(), is(Optional.of(parent)));
+    }
+
+    @Test
+    public void testNoParent() {
+        Resource resource = Resource.discrete(D1);
+
+        assertThat(resource.parent(), is(Optional.of(Resource.ROOT)));
+    }
+
+    @Test
+    public void testBase() {
+        Resource resource = Resource.discrete(D1);
+
+        DeviceId child = (DeviceId) resource.last();
+        assertThat(child, is(D1));
+    }
+}