HC2VPP-379: move NAT validation code out of customizers

Use Validator interface introduced by HONEYCOMB-431:
https://gerrit.fd.io/r/#/c/14022/

Change-Id: I9e4c8d59f299ed7da4a93bbdc70c81f2bea93606
Signed-off-by: Marek Gradzki <mgradzki@cisco.com>

1 files changed, 38 insertions, 0 deletions

diff --git a/nat/nat2vpp/src/main/java/io/fd/hc2vpp/nat/write/NatInstanceValidator.java b/nat/nat2vpp/src/main/java/io/fd/hc2vpp/nat/write/NatInstanceValidator.java
new file mode 100644
index 000000000..1f3975513
--- /dev/null
+++ b/nat/nat2vpp/src/main/java/io/fd/hc2vpp/nat/write/NatInstanceValidator.java
@@ -0,0 +1,38 @@
+/*
+ * 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 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;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+
+final class NatInstanceValidator implements Validator<Instance> {
+    @Override
+    public void validateDelete(@Nonnull final InstanceIdentifier<Instance> id, @Nonnull final Instance dataBefore,
+                               @Nonnull final WriteContext writeContext)
+        throws DataValidationFailedException.DeleteValidationFailedException {
+        // For consistency with reader, forbid removing default NAT instance:
+        final Long vrfId = id.firstKeyOf(Instance.class).getId();
+        if (vrfId == 0) {
+            throw new DataValidationFailedException.DeleteValidationFailedException(id,
+                new UnsupportedOperationException("Removing default NAT instance (vrf=0) is not supported."));
+        }
+    }
+}