Define a class representing a set of discrete resources
Change-Id: Iaafc5ca68ae3b1330e6c8b0b2476d835a42731b6
diff --git a/core/store/dist/src/main/java/org/onosproject/store/resource/impl/DiscreteResources.java b/core/store/dist/src/main/java/org/onosproject/store/resource/impl/DiscreteResources.java
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+++ b/core/store/dist/src/main/java/org/onosproject/store/resource/impl/DiscreteResources.java
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+/*
+ * Copyright 2016-present 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.store.resource.impl;
+
+import com.google.common.base.MoreObjects;
+import com.google.common.collect.Sets;
+import org.onosproject.net.resource.DiscreteResource;
+import org.onosproject.net.resource.DiscreteResourceId;
+import org.onosproject.net.resource.Resources;
+
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Objects;
+import java.util.Optional;
+import java.util.Set;
+
+final class DiscreteResources {
+ private final Set<DiscreteResource> values;
+
+ static DiscreteResources empty() {
+ return new DiscreteResources();
+ }
+
+ private DiscreteResources() {
+ this.values = new LinkedHashSet<>();
+ }
+
+ DiscreteResources(List<DiscreteResource> values) {
+ this.values = new LinkedHashSet<>(values);
+ }
+
+ private DiscreteResources(Set<DiscreteResource> values) {
+ this.values = values;
+ }
+
+ Optional<DiscreteResource> lookup(DiscreteResourceId id) {
+ DiscreteResource resource = Resources.discrete(id).resource();
+ if (values.contains(resource)) {
+ return Optional.of(resource);
+ } else {
+ return Optional.empty();
+ }
+ }
+
+ DiscreteResources difference(DiscreteResources other) {
+ return new DiscreteResources(Sets.difference(this.values, other.values));
+ }
+
+ boolean isEmpty() {
+ return values.isEmpty();
+ }
+
+ boolean containsAny(List<DiscreteResource> other) {
+ return other.stream().anyMatch(values::contains);
+ }
+
+ // returns a new instance, not mutate the current instance
+ DiscreteResources add(DiscreteResources other) {
+ Set<DiscreteResource> newValues = new LinkedHashSet<>(this.values);
+ newValues.addAll(other.values);
+ return new DiscreteResources(newValues);
+ }
+
+ // returns a new instance, not mutate the current instance
+ DiscreteResources remove(List<DiscreteResource> removed) {
+ Set<DiscreteResource> newValues = new LinkedHashSet<>(this.values);
+ newValues.removeAll(removed);
+ return new DiscreteResources(newValues);
+ }
+
+ Set<DiscreteResource> values() {
+ // breaks immutability, but intentionally returns the field
+ // because this class is transient
+ return values;
+ }
+
+ @Override
+ public int hashCode() {
+ return Objects.hash(values);
+ }
+
+ @Override
+ public boolean equals(Object obj) {
+ if (this == obj) {
+ return true;
+ }
+ if (obj == null || getClass() != obj.getClass()) {
+ return false;
+ }
+ final DiscreteResources other = (DiscreteResources) obj;
+ return Objects.equals(this.values, other.values);
+ }
+
+ @Override
+ public String toString() {
+ return MoreObjects.toStringHelper(this)
+ .add("values", values)
+ .toString();
+ }
+}