1 files changed, 52 insertions, 0 deletions
diff --git a/nat/nat2vpp/src/main/java/io/fd/hc2vpp/nat/write/PolicyValidator.java b/nat/nat2vpp/src/main/java/io/fd/hc2vpp/nat/write/PolicyValidator.java
new file mode 100644
index 000000000..8b13a0851
--- /dev/null
+++ b/nat/nat2vpp/src/main/java/io/fd/hc2vpp/nat/write/PolicyValidator.java
@@ -0,0 +1,52 @@
+/*
+ * 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.write.DataValidationFailedException;
+import io.fd.honeycomb.translate.write.Validator;
+import io.fd.honeycomb.translate.write.WriteContext;
+import javax.annotation.Nonnull;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.nat.rev180628.nat.instances.instance.Policy;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+
+final class PolicyValidator implements Validator<Policy> {
+    @Override
+    public void validateWrite(@Nonnull final InstanceIdentifier<Policy> id, @Nonnull final Policy dataAfter,
+                              @Nonnull final WriteContext writeContext)
+        throws DataValidationFailedException.CreateValidationFailedException {
+        try {
+            validatePolicy(id, dataAfter);
+        } catch (RuntimeException e) {
+            throw new DataValidationFailedException.CreateValidationFailedException(id, dataAfter, e);
+        }
+    }
+
+    private void validatePolicy(final InstanceIdentifier<Policy> id, final Policy policy) {
+        // 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);
+
+        if (policy.getNat64Prefixes() != null) {
+            final int prefixCount = policy.getNat64Prefixes().size();
+            checkArgument(prefixCount <= 1, "Only single nat64-prefix is supported, but %s given", prefixCount);
+        }
+    }
+}