Introduce abstract interface for set of discrete resources

Change-Id: Iddbed1a2dd0c6ce3d7288371a47a7b0aeba46803
diff --git a/core/store/dist/src/main/java/org/onosproject/store/resource/impl/NonEncodableDiscreteResources.java b/core/store/dist/src/main/java/org/onosproject/store/resource/impl/NonEncodableDiscreteResources.java
new file mode 100644
index 0000000..c285ae5
--- /dev/null
+++ b/core/store/dist/src/main/java/org/onosproject/store/resource/impl/NonEncodableDiscreteResources.java
@@ -0,0 +1,120 @@
+/*
+ * 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 NonEncodableDiscreteResources implements DiscreteResources {
+    private final Set<DiscreteResource> values;
+
+    static NonEncodableDiscreteResources empty() {
+        return new NonEncodableDiscreteResources();
+    }
+
+    private NonEncodableDiscreteResources() {
+        this.values = new LinkedHashSet<>();
+    }
+
+    NonEncodableDiscreteResources(List<DiscreteResource> values) {
+        this.values = new LinkedHashSet<>(values);
+    }
+
+    private NonEncodableDiscreteResources(Set<DiscreteResource> values) {
+        this.values = values;
+    }
+
+    @Override
+    public Optional<DiscreteResource> lookup(DiscreteResourceId id) {
+        DiscreteResource resource = Resources.discrete(id).resource();
+        if (values.contains(resource)) {
+            return Optional.of(resource);
+        } else {
+            return Optional.empty();
+        }
+    }
+
+    @Override
+    public DiscreteResources difference(DiscreteResources other) {
+        return new NonEncodableDiscreteResources(Sets.difference(this.values, other.values()));
+    }
+
+    @Override
+    public boolean isEmpty() {
+        return values.isEmpty();
+    }
+
+    @Override
+    public boolean containsAny(List<DiscreteResource> other) {
+        return other.stream().anyMatch(values::contains);
+    }
+
+    // returns a new instance, not mutate the current instance
+    @Override
+    public DiscreteResources add(DiscreteResources other) {
+        Set<DiscreteResource> newValues = new LinkedHashSet<>(this.values);
+        newValues.addAll(other.values());
+        return new NonEncodableDiscreteResources(newValues);
+    }
+
+    // returns a new instance, not mutate the current instance
+    @Override
+    public DiscreteResources remove(List<DiscreteResource> removed) {
+        Set<DiscreteResource> newValues = new LinkedHashSet<>(this.values);
+        newValues.removeAll(removed);
+        return new NonEncodableDiscreteResources(newValues);
+    }
+
+    @Override
+    public 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 NonEncodableDiscreteResources other = (NonEncodableDiscreteResources) obj;
+        return Objects.equals(this.values, other.values);
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(this)
+                .add("values", values)
+                .toString();
+    }
+}