| /* |
| * 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 com.google.common.base.MoreObjects; |
| |
| import java.util.List; |
| import java.util.Objects; |
| import java.util.Optional; |
| |
| import static com.google.common.base.Preconditions.checkArgument; |
| |
| /** |
| * 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 |
| public final class DiscreteResource implements Resource { |
| private final DiscreteResourceId id; |
| |
| DiscreteResource(DiscreteResourceId id) { |
| this.id = id; |
| } |
| |
| DiscreteResource() { |
| this.id = ResourceId.ROOT; |
| } |
| |
| @Override |
| public DiscreteResourceId id() { |
| return 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 List<Object> components() { |
| return id.components(); |
| } |
| |
| @Override |
| public Object last() { |
| if (id.components().isEmpty()) { |
| return null; |
| } |
| return id.components().get(id.components().size() - 1); |
| } |
| |
| @Override |
| public DiscreteResource child(Object child) { |
| checkArgument(!(child instanceof Class<?>)); |
| |
| return Resources.discrete(id.child(child)).resource(); |
| } |
| |
| @Override |
| public ContinuousResource child(Class<?> child, double value) { |
| return Resources.continuous(id.child(child)).resource(value); |
| } |
| |
| @Override |
| public Optional<DiscreteResource> parent() { |
| return id.parent().map(x -> Resources.discrete(x).resource()); |
| } |
| |
| @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); |
| } |
| |
| @Override |
| public String toString() { |
| return MoreObjects.toStringHelper(this) |
| .add("id", id) |
| .add("volume", volume()) |
| .toString(); |
| } |
| } |