pretty builders

Change-Id: If03b60f97be1eba3803c6fcb328196a4a195c7e8
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 9ec49e4..8f68ea5 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
@@ -6,7 +6,12 @@
 import java.util.LinkedList;
 import java.util.List;
 
+import org.onlab.onos.net.PortNumber;
+import org.onlab.onos.net.flow.criteria.Criteria;
 import org.onlab.onos.net.flow.criteria.Criterion;
+import org.onlab.packet.IpPrefix;
+import org.onlab.packet.MacAddress;
+import org.onlab.packet.VlanId;
 import org.slf4j.Logger;
 
 public final class DefaultTrafficSelector implements TrafficSelector {
@@ -29,11 +34,47 @@
         private final List<Criterion> selector = new LinkedList<>();
 
         @Override
-        public TrafficSelector.Builder add(Criterion criterion) {
+        public Builder add(Criterion criterion) {
             selector.add(criterion);
             return this;
         }
 
+        public Builder matchInport(PortNumber port) {
+            return add(Criteria.matchInPort(port));
+        }
+
+        public Builder matchEthSrc(MacAddress addr) {
+            return add(Criteria.matchEthSrc(addr));
+        }
+
+        public Builder matchEthDst(MacAddress addr) {
+            return add(Criteria.matchEthDst(addr));
+        }
+
+        public Builder matchEthType(short ethType) {
+            return add(Criteria.matchEthType(ethType));
+        }
+
+        public Builder matchVlanId(VlanId vlanId) {
+            return add(Criteria.matchVlanId(vlanId));
+        }
+
+        public Builder matchVlanPcp(Byte vlanPcp) {
+            return add(Criteria.matchVlanPcp(vlanPcp));
+        }
+
+        public Builder matchIPProtocol(Byte proto) {
+            return add(Criteria.matchIPProtocol(proto));
+        }
+
+        public Builder matchIPSrc(IpPrefix ip) {
+            return add(Criteria.matchIPSrc(ip));
+        }
+
+        public Builder matchIPDst(IpPrefix ip) {
+            return add(Criteria.matchIPDst(ip));
+        }
+
         @Override
         public TrafficSelector build() {
             return new DefaultTrafficSelector(selector);