| /* |
| * Copyright 2016 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.annotations.Beta; |
| |
| import java.util.Objects; |
| |
| /** |
| * Represents a resource path which specifies a resource which can be measured |
| * as a discrete unit. A VLAN ID and a MPLS label of a link are examples of the resource. |
| * <p> |
| * Note: This class is exposed to the public, but intended to be used in the resource API |
| * implementation only. It is not for resource API user. |
| * </p> |
| */ |
| @Beta |
| // TODO: consider how to restrict the visibility |
| public final class DiscreteResource extends Resource { |
| protected DiscreteResource() { |
| super(); |
| } |
| |
| DiscreteResource(ResourceId id) { |
| super(id); |
| } |
| |
| /** |
| * The user of this methods must receive the return value as the correct type. |
| * Otherwise, this methods throws an exception. |
| * |
| * @param <T> type of the return value |
| * @return the volume of this resource |
| */ |
| @SuppressWarnings("unchecked") |
| @Override |
| // TODO: consider receiving Class<T> as an argument. Which approach is convenient? |
| public <T> T volume() { |
| return (T) last(); |
| } |
| |
| @Override |
| public int hashCode() { |
| // the value returing from volume() is excluded due to optimization |
| return id().hashCode(); |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (this == obj) { |
| return true; |
| } |
| if (obj == null || getClass() != obj.getClass()) { |
| return false; |
| } |
| final DiscreteResource other = (DiscreteResource) obj; |
| // the value returing from volume() is excluded due to optimization |
| return Objects.equals(this.id(), other.id()); |
| } |
| } |