1 files changed, 55 insertions, 0 deletions
diff --git a/nat/nat2vpp/src/main/java/io/fd/hc2vpp/nat/write/PolicyCustomizer.java b/nat/nat2vpp/src/main/java/io/fd/hc2vpp/nat/write/PolicyCustomizer.java
new file mode 100644
index 000000000..ecc340f38
--- /dev/null
+++ b/nat/nat2vpp/src/main/java/io/fd/hc2vpp/nat/write/PolicyCustomizer.java
@@ -0,0 +1,55 @@
+/*
+ * Copyright (c) 2018 Cisco and/or its affiliates.
+ *
+ * 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 io.fd.hc2vpp.nat.write;
+
+import static com.google.common.base.Preconditions.checkArgument;
+
+import io.fd.honeycomb.translate.spi.write.ListWriterCustomizer;
+import io.fd.honeycomb.translate.write.WriteContext;
+import io.fd.honeycomb.translate.write.WriteFailedException;
+import javax.annotation.Nonnull;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.nat.rev180223.nat.instances.Instance;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.nat.rev180223.nat.instances.instance.Policy;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.nat.rev180223.nat.instances.instance.PolicyKey;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+final class PolicyCustomizer implements ListWriterCustomizer<Policy, PolicyKey> {
+
+    private static final Logger LOG = LoggerFactory.getLogger(PolicyCustomizer.class);
+
+    @Override
+    public void writeCurrentAttributes(@Nonnull final InstanceIdentifier<Policy> id,
+                                       @Nonnull final Policy dataAfter, @Nonnull final WriteContext writeContext)
+            throws WriteFailedException {
+        LOG.trace("Writing NAT policy: {}", id);
+
+        // HC supports only single NAT policy per NAT instance (VRF)
+        // To ensure that (and for simplicity), we require policy id = 0.
+        final Long policyId = id.firstKeyOf(Policy.class).getId();
+        checkArgument(policyId == 0,
+            "Only single policy per NAT instance (VRF) is supported (expected id=0, but %s given)", policyId);
+    }
+
+    @Override
+    public void deleteCurrentAttributes(@Nonnull final InstanceIdentifier<Policy> id,
+                                        @Nonnull final Policy dataBefore, @Nonnull final WriteContext writeContext)
+            throws WriteFailedException {
+        LOG.trace("Deleting NAT policy: {}", id);
+    }
+}