diff --git a/core/net/src/main/java/org/onosproject/net/pi/impl/CriterionTranslators.java b/core/net/src/main/java/org/onosproject/net/pi/impl/CriterionTranslators.java
new file mode 100644
index 0000000..089f80a
--- /dev/null
+++ b/core/net/src/main/java/org/onosproject/net/pi/impl/CriterionTranslators.java
@@ -0,0 +1,82 @@
+/*
+ * Copyright 2017-present 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.pi.impl;
+
+import org.onlab.util.ImmutableByteSequence;
+import org.onosproject.net.flow.criteria.Criterion;
+import org.onosproject.net.flow.criteria.EthCriterion;
+import org.onosproject.net.flow.criteria.EthTypeCriterion;
+import org.onosproject.net.flow.criteria.IPCriterion;
+import org.onosproject.net.flow.criteria.PortCriterion;
+
+import static org.onlab.util.ImmutableByteSequence.ByteSequenceTrimException;
+import static org.onlab.util.ImmutableByteSequence.copyFrom;
+
+/**
+ * Factory class of criterion translator implementations.
+ */
+final class CriterionTranslators {
+
+    /**
+     * Translator of PortCriterion.
+     */
+    static final class PortCriterionTranslator extends AbstractCriterionTranslator {
+        @Override
+        public void init(Criterion criterion, int bitWidth) throws ByteSequenceTrimException {
+            PortCriterion c = (PortCriterion) criterion;
+            initAsExactMatch(copyFrom(c.port().toLong()), bitWidth);
+        }
+    }
+
+    /**
+     * Translator of EthTypeCriterion.
+     */
+    static final class EthTypeCriterionTranslator extends AbstractCriterionTranslator {
+        @Override
+        public void init(Criterion criterion, int bitWidth) throws ByteSequenceTrimException {
+            EthTypeCriterion c = (EthTypeCriterion) criterion;
+            initAsExactMatch(copyFrom(c.ethType().toShort()), bitWidth);
+        }
+    }
+
+    /**
+     * Translator of EthCriterion.
+     */
+    static final class EthCriterionTranslator extends AbstractCriterionTranslator {
+        @Override
+        public void init(Criterion criterion, int bitWidth) throws ByteSequenceTrimException {
+            EthCriterion c = (EthCriterion) criterion;
+            ImmutableByteSequence value = copyFrom(c.mac().toBytes());
+            if (c.mask() == null) {
+                initAsExactMatch(value, bitWidth);
+            } else {
+                ImmutableByteSequence mask = copyFrom(c.mask().toBytes());
+                initAsTernaryMatch(value, mask, bitWidth);
+            }
+        }
+    }
+
+    /**
+     * Translator of IpCriterion.
+     */
+    static final class IpCriterionTranslator extends AbstractCriterionTranslator {
+        public void init(Criterion criterion, int bitWidth) throws ByteSequenceTrimException {
+            IPCriterion c = (IPCriterion) criterion;
+            initAsLpm(copyFrom(c.ip().address().toOctets()), c.ip().prefixLength(), bitWidth);
+        }
+    }
+}