[Emu] Disjoint Path Utils Exposed (to DefaultTopology)
Change-Id: I1d59d7a5a89618bd7419f00a0da674e87fe9bdb3
diff --git a/core/api/src/main/java/org/onosproject/net/DefaultDisjointPath.java b/core/api/src/main/java/org/onosproject/net/DefaultDisjointPath.java
new file mode 100644
index 0000000..4895964
--- /dev/null
+++ b/core/api/src/main/java/org/onosproject/net/DefaultDisjointPath.java
@@ -0,0 +1,100 @@
+/*
+ * 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;
+
+import org.onosproject.net.provider.ProviderId;
+
+import java.util.List;
+import java.util.Objects;
+import static com.google.common.collect.ImmutableSet.of;
+
+/**
+ * Default implementation of a network disjoint path pair.
+ */
+public class DefaultDisjointPath extends DefaultPath implements DisjointPath {
+
+ private final DefaultPath path1;
+ private final DefaultPath path2;
+
+ boolean usingPath1 = true;
+
+ /**
+ * Creates a disjoint path pair from two default paths.
+ *
+ * @param providerId provider identity
+ * @param path1 primary path
+ * @param path2 backup path
+ */
+ public DefaultDisjointPath(ProviderId providerId, DefaultPath path1, DefaultPath path2) {
+ super(providerId, path1.links(), path1.cost() + path2.cost());
+ this.path1 = path1;
+ this.path2 = path2;
+ }
+
+ @Override
+ public List<Link> links() {
+ if (usingPath1) {
+ return path1.links();
+ } else {
+ return path2.links();
+ }
+ }
+
+ @Override
+ public double cost() {
+ if (usingPath1) {
+ return path1.cost();
+ }
+ return path2.cost();
+ }
+
+ @Override
+ public Path primary() {
+ return path1;
+ }
+
+ @Override
+ public Path backup() {
+ return path2;
+ }
+
+ @Override
+ public int hashCode() {
+ return Objects.hash(of(path1, path2), src(), dst());
+ }
+
+ @Override
+ public boolean equals(Object obj) {
+ if (this == obj) {
+ return true;
+ }
+ if (obj instanceof DefaultDisjointPath) {
+ final DefaultDisjointPath other = (DefaultDisjointPath) obj;
+ return Objects.equals(this.path1, other.path1) && Objects.equals(this.path2, other.path2);
+ }
+ return false;
+ }
+
+ @Override
+ public boolean useBackup() {
+ if (path2 == null || path2.links() == null) {
+ return false;
+ }
+ usingPath1 = !usingPath1;
+ return true;
+ }
+}