1 files changed, 37 insertions, 0 deletions
diff --git a/framework/src/onos/core/api/src/main/java/org/onosproject/net/DefaultOchSignalComparator.java b/framework/src/onos/core/api/src/main/java/org/onosproject/net/DefaultOchSignalComparator.java
new file mode 100644
index 00000000..e605dcfd
--- /dev/null
+++ b/framework/src/onos/core/api/src/main/java/org/onosproject/net/DefaultOchSignalComparator.java
@@ -0,0 +1,37 @@
+/*
+ * 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 java.util.Comparator;
+
+import static com.google.common.base.Preconditions.checkArgument;
+import static com.google.common.base.Preconditions.checkNotNull;
+
+/**
+ * Comparator implementation for OchSignal. Assumes identical grid type and channel spacing.
+ */
+public class DefaultOchSignalComparator implements Comparator<OchSignal> {
+    @Override
+    public int compare(OchSignal o1, OchSignal o2) {
+        checkNotNull(o1.gridType());
+        checkNotNull(o1.channelSpacing());
+
+        checkArgument(o1.gridType().equals(o2.gridType()));
+        checkArgument(o1.channelSpacing().equals(o2.channelSpacing()));
+
+        return o1.spacingMultiplier() * o1.slotGranularity() - o2.spacingMultiplier() * o2.slotGranularity();
+    }
+}