[onos-3494] Implement TCP Flags Criterion to Southbound

Change-Id: I65bdfa7286249dabfc8109faca140a000efd5e48

@@ -230,6 +230,16 @@ public final class Criteria {
     }
     }
 
 
     /**
     /**
+     * Creates a match on TCP flags using the specified value.
+     *
+     * @param flags TCP flags
+     * @return match criterion
+     */
+    public static Criterion matchTcpFlags(int flags) {
+        return new TcpFlagsCriterion(flags);
+    }
+
+    /**
      * Creates a match on UDP source port field using the specified value.
      * Creates a match on UDP source port field using the specified value.
      *
      *
      * @param udpPort UDP source port
      * @param udpPort UDP source port

+/*
+ * 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.flow.criteria;
+
+import java.util.Objects;
+
+import static com.google.common.base.MoreObjects.toStringHelper;
+
+/**
+ * Implementation of TCP flags criterion (12 bits unsigned integer).
+ */
+public final class TcpFlagsCriterion implements Criterion {
+    private static final int MASK = 0xfffff;
+    private final int flags;            // TCP flags: 12 bits
+
+    /**
+     * Constructor.
+     *
+     * @param flags the TCP flags to match (12 bits)
+     */
+    TcpFlagsCriterion(int flags) {
+        this.flags = flags & MASK;
+    }
+
+    @Override
+    public Type type() {
+        return Type.TCP_FLAGS;
+    }
+
+    /**
+     * Gets the TCP flags to match.
+     *
+     * @return the TCP flags to match (12 bits)
+     */
+    public int flags() {
+        return flags;
+    }
+
+    @Override
+    public String toString() {
+        return toStringHelper(type().toString())
+                .add("flags", Long.toHexString(flags)).toString();
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(type().ordinal(), flags);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj instanceof TcpFlagsCriterion) {
+            TcpFlagsCriterion that = (TcpFlagsCriterion) obj;
+            return Objects.equals(flags, that.flags) &&
+                    Objects.equals(this.type(), that.type());
+        }
+        return false;
+    }
+}