Support lambda's in selector & treatment
diff --git a/core/api/src/main/java/org/onlab/onos/net/flow/DefaultTrafficSelector.java b/core/api/src/main/java/org/onlab/onos/net/flow/DefaultTrafficSelector.java
index abb29a6..63e7e24 100644
--- a/core/api/src/main/java/org/onlab/onos/net/flow/DefaultTrafficSelector.java
+++ b/core/api/src/main/java/org/onlab/onos/net/flow/DefaultTrafficSelector.java
@@ -176,6 +176,11 @@
         }
 
         @Override
+        public Builder matchLambda(short lambda) {
+            return add(Criteria.matchLambda(lambda));
+        }
+
+        @Override
         public TrafficSelector build() {
             return new DefaultTrafficSelector(ImmutableSet.copyOf(selector.values()));
         }
diff --git a/core/api/src/main/java/org/onlab/onos/net/flow/DefaultTrafficTreatment.java b/core/api/src/main/java/org/onlab/onos/net/flow/DefaultTrafficTreatment.java
index b4d8c3e..0300079 100644
--- a/core/api/src/main/java/org/onlab/onos/net/flow/DefaultTrafficTreatment.java
+++ b/core/api/src/main/java/org/onlab/onos/net/flow/DefaultTrafficTreatment.java
@@ -137,6 +137,7 @@
                 case OUTPUT:
                     outputs.add(instruction);
                     break;
+                case L0MODIFICATION:
                 case L2MODIFICATION:
                 case L3MODIFICATION:
                     // TODO: enforce modification order if any
@@ -193,6 +194,11 @@
         }
 
         @Override
+        public Builder setLambda(short lambda) {
+            return add(Instructions.modL0Lambda(lambda));
+        }
+
+        @Override
         public TrafficTreatment build() {
 
             //If we are dropping should we just return an emptry list?
diff --git a/core/api/src/main/java/org/onlab/onos/net/flow/TrafficSelector.java b/core/api/src/main/java/org/onlab/onos/net/flow/TrafficSelector.java
index b4d566c..49815db 100644
--- a/core/api/src/main/java/org/onlab/onos/net/flow/TrafficSelector.java
+++ b/core/api/src/main/java/org/onlab/onos/net/flow/TrafficSelector.java
@@ -130,6 +130,13 @@
         public Builder matchTcpDst(Short tcpPort);
 
         /**
+         * Matches an optical signal ID or lambda.
+         * @param lambda
+         * @return a selection builder
+         */
+        public Builder matchLambda(short lambda);
+
+        /**
          * Builds an immutable traffic selector.
          *
          * @return traffic selector
diff --git a/core/api/src/main/java/org/onlab/onos/net/flow/TrafficTreatment.java b/core/api/src/main/java/org/onlab/onos/net/flow/TrafficTreatment.java
index a576138..9b135ba 100644
--- a/core/api/src/main/java/org/onlab/onos/net/flow/TrafficTreatment.java
+++ b/core/api/src/main/java/org/onlab/onos/net/flow/TrafficTreatment.java
@@ -105,6 +105,13 @@
         public Builder setIpDst(IpPrefix addr);
 
         /**
+         * Sets the optical channel ID or lambda.
+         * @param lambda optical channel ID
+         * @return a treatment builder
+         */
+        public Builder setLambda(short lambda);
+
+        /**
          * Builds an immutable traffic treatment descriptor.
          *
          * @return traffic treatment
diff --git a/core/api/src/main/java/org/onlab/onos/net/flow/criteria/Criteria.java b/core/api/src/main/java/org/onlab/onos/net/flow/criteria/Criteria.java
index fb5fb97..2e177f7 100644
--- a/core/api/src/main/java/org/onlab/onos/net/flow/criteria/Criteria.java
+++ b/core/api/src/main/java/org/onlab/onos/net/flow/criteria/Criteria.java
@@ -151,10 +151,19 @@
         return new TcpPortCriterion(tcpPort, Type.TCP_DST);
     }
 
-    /*
+    /**
+     * Creates a match on lambda field using the specified value.
+     *
+     * @param lambda
+     * @return match criterion
+     */
+    public static Criterion matchLambda(Short lambda) {
+        return new LambdaCriterion(lambda, Type.OCH_SIGID);
+    }
+
+    /**
      * Implementations of criteria.
      */
-
     public static final class PortCriterion implements Criterion {
         private final PortNumber port;
 
@@ -523,4 +532,49 @@
             return false;
         }
     }
+
+    public static final class LambdaCriterion implements Criterion {
+
+        private final short lambda;
+        private final Type type;
+
+        public LambdaCriterion(short lambda, Type type) {
+            this.lambda = lambda;
+            this.type = type;
+        }
+
+        @Override
+        public Type type() {
+            return this.type;
+        }
+
+        public Short lambda() {
+            return this.lambda;
+        }
+
+        @Override
+        public String toString() {
+            return toStringHelper(type().toString())
+                    .add("lambda", lambda).toString();
+        }
+
+        @Override
+        public int hashCode() {
+            return Objects.hash(lambda, type);
+        }
+
+        @Override
+        public boolean equals(Object obj) {
+            if (this == obj) {
+                return true;
+            }
+            if (obj instanceof LambdaCriterion) {
+                LambdaCriterion that = (LambdaCriterion) obj;
+                return Objects.equals(lambda, that.lambda) &&
+                        Objects.equals(type, that.type);
+            }
+            return false;
+        }
+    }
+
 }
diff --git a/core/api/src/main/java/org/onlab/onos/net/flow/criteria/Criterion.java b/core/api/src/main/java/org/onlab/onos/net/flow/criteria/Criterion.java
index 5337852..6110892 100644
--- a/core/api/src/main/java/org/onlab/onos/net/flow/criteria/Criterion.java
+++ b/core/api/src/main/java/org/onlab/onos/net/flow/criteria/Criterion.java
@@ -108,7 +108,11 @@
         /** Logical Port Metadata. */
         TUNNEL_ID,
         /** IPv6 Extension Header pseudo-field. */
-        IPV6_EXTHDR
+        IPV6_EXTHDR,
+        /** Optical channel signal ID (lambda). */
+        OCH_SIGID,
+        /** Optical channel signal type (fixed or flexible). */
+        OCH_SIGTYPE
     }
 
     /**
diff --git a/core/api/src/main/java/org/onlab/onos/net/flow/instructions/Instruction.java b/core/api/src/main/java/org/onlab/onos/net/flow/instructions/Instruction.java
index 084ffe4..9b578b6 100644
--- a/core/api/src/main/java/org/onlab/onos/net/flow/instructions/Instruction.java
+++ b/core/api/src/main/java/org/onlab/onos/net/flow/instructions/Instruction.java
@@ -43,6 +43,11 @@
         GROUP,
 
         /**
+         * Signifies that the traffic should be modified in L0 way.
+         */
+        L0MODIFICATION,
+
+        /**
          * Signifies that the traffic should be modified in L2 way.
          */
         L2MODIFICATION,
diff --git a/core/api/src/main/java/org/onlab/onos/net/flow/instructions/Instructions.java b/core/api/src/main/java/org/onlab/onos/net/flow/instructions/Instructions.java
index 988c52f..b18d7ef 100644
--- a/core/api/src/main/java/org/onlab/onos/net/flow/instructions/Instructions.java
+++ b/core/api/src/main/java/org/onlab/onos/net/flow/instructions/Instructions.java
@@ -24,6 +24,8 @@
 import java.util.Objects;
 
 import org.onlab.onos.net.PortNumber;
+import org.onlab.onos.net.flow.instructions.L0ModificationInstruction.L0SubType;
+import org.onlab.onos.net.flow.instructions.L0ModificationInstruction.ModLambdaInstruction;
 import org.onlab.onos.net.flow.instructions.L2ModificationInstruction.L2SubType;
 import org.onlab.onos.net.flow.instructions.L2ModificationInstruction.ModEtherInstruction;
 import org.onlab.onos.net.flow.instructions.L3ModificationInstruction.L3SubType;
@@ -62,6 +64,16 @@
     }
 
     /**
+     * Creates a l0 modification.
+     * @param lambda the lambda to modify to.
+     * @return a l0 modification
+     */
+    public static L0ModificationInstruction modL0Lambda(short lambda) {
+        checkNotNull(lambda, "L0 lambda cannot be null");
+        return new ModLambdaInstruction(L0SubType.LAMBDA, lambda);
+    }
+
+    /**
      * Creates a l2 src modification.
      * @param addr the mac address to modify to.
      * @return a l2 modification
diff --git a/core/api/src/main/java/org/onlab/onos/net/flow/instructions/L0ModificationInstruction.java b/core/api/src/main/java/org/onlab/onos/net/flow/instructions/L0ModificationInstruction.java
new file mode 100644
index 0000000..23e5f2a
--- /dev/null
+++ b/core/api/src/main/java/org/onlab/onos/net/flow/instructions/L0ModificationInstruction.java
@@ -0,0 +1,75 @@
+package org.onlab.onos.net.flow.instructions;
+
+import static com.google.common.base.MoreObjects.toStringHelper;
+
+import java.util.Objects;
+
+public abstract class L0ModificationInstruction implements Instruction {
+
+    /**
+     * Represents the type of traffic treatment.
+     */
+    public enum L0SubType {
+        /**
+         * Lambda modification.
+         */
+        LAMBDA
+
+        //TODO: remaining types
+    }
+
+    public abstract L0SubType subtype();
+
+    @Override
+    public Type type() {
+        return Type.L0MODIFICATION;
+    }
+
+    /**
+     * Represents a L0 lambda modification instruction.
+     */
+    public static final class ModLambdaInstruction extends L0ModificationInstruction {
+
+        private final L0SubType subtype;
+        private final short lambda;
+
+        public ModLambdaInstruction(L0SubType subType, short lambda) {
+            this.subtype = subType;
+            this.lambda = lambda;
+        }
+
+        @Override
+        public L0SubType subtype() {
+            return this.subtype;
+        }
+
+        public short lambda() {
+            return this.lambda;
+        }
+
+        @Override
+        public String toString() {
+            return toStringHelper(subtype().toString())
+                    .add("lambda", lambda).toString();
+        }
+
+        @Override
+        public int hashCode() {
+            return Objects.hash(lambda, type(), subtype);
+        }
+
+        @Override
+        public boolean equals(Object obj) {
+            if (this == obj) {
+                return true;
+            }
+            if (obj instanceof ModLambdaInstruction) {
+                ModLambdaInstruction that = (ModLambdaInstruction) obj;
+                return  Objects.equals(lambda, that.lambda) &&
+                        Objects.equals(this.type(), that.type()) &&
+                        Objects.equals(subtype, that.subtype);
+            }
+            return false;
+        }
+    }
+}