1 files changed, 57 insertions, 0 deletions
diff --git a/framework/src/onos/providers/null/src/main/java/org/onosproject/provider/nil/RerouteTopologySimulator.java b/framework/src/onos/providers/null/src/main/java/org/onosproject/provider/nil/RerouteTopologySimulator.java
new file mode 100644
index 00000000..d17466b9
--- /dev/null
+++ b/framework/src/onos/providers/null/src/main/java/org/onosproject/provider/nil/RerouteTopologySimulator.java
@@ -0,0 +1,57 @@
+/*
+ * 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.provider.nil;
+
+import static com.google.common.base.Preconditions.checkArgument;
+
+/**
+ * Re-routable linear topology simulator with an alternate path in the middle.
+ */
+public class RerouteTopologySimulator extends LinearTopologySimulator {
+
+    @Override
+    protected void processTopoShape(String shape) {
+        super.processTopoShape(shape);
+        infrastructurePorts = 5;
+        deviceCount = (topoShape.length == 1) ? deviceCount : Integer.parseInt(topoShape[1]);
+    }
+
+    @Override
+    public void setUpTopology() {
+        checkArgument(deviceCount > 2, "There must be at least 3 devices");
+        super.setUpTopology();
+    }
+
+    @Override
+    protected void createLinks() {
+        int portOffset = 1;
+        for (int i = 0, n = deviceCount - 2; i < n; i++) {
+            createLink(i, i + 1, portOffset, 1);
+            portOffset = 2;
+        }
+        int middle = (deviceCount - 1) / 2;
+        int alternate = deviceCount - 1;
+        createLink(middle - 1, alternate, 3, 1);
+        createLink(middle, alternate, 3, 2);
+    }
+
+    @Override
+    protected void createHosts() {
+        createHosts(deviceIds.get(0), infrastructurePorts);
+        createHosts(deviceIds.get(deviceCount - 2), infrastructurePorts);
+    }
+
+}