HONEYCOMB-431: add validation support to Writers

This patch introduces FlatWriterRegistry.validateModifications.
Implementation iterates over writersOrder following bulkUpdate logic
to properly support subtree writers case.

Writers are now cabable of validating modifications.
Commonly used implementations (GenericWriter and GenericListWriter)
delegate validation capbility to Validators.

Change-Id: If7a0bb0838c0b8f2c0393c989f3b03853a2ea679
Signed-off-by: Marek Gradzki <mgradzki@cisco.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/infra/translate-impl/src/main/java/io/fd/honeycomb/translate/impl/write/registry/SubtreeWriter.java b/infra/translate-impl/src/main/java/io/fd/honeycomb/translate/impl/write/registry/SubtreeWriter.java
index a1a5f3fd0..e510bc33c 100644
--- a/infra/translate-impl/src/main/java/io/fd/honeycomb/translate/impl/write/registry/SubtreeWriter.java
+++ b/infra/translate-impl/src/main/java/io/fd/honeycomb/translate/impl/write/registry/SubtreeWriter.java
@@ -19,6 +19,7 @@ package io.fd.honeycomb.translate.impl.write.registry;
 import static com.google.common.base.Preconditions.checkArgument;
 
 import com.google.common.collect.Iterables;
+import io.fd.honeycomb.translate.write.DataValidationFailedException;
 import io.fd.honeycomb.translate.write.WriteContext;
 import io.fd.honeycomb.translate.write.WriteFailedException;
 import io.fd.honeycomb.translate.write.Writer;
@@ -68,6 +69,13 @@ final class SubtreeWriter<D extends DataObject> implements Writer<D> {
     }
 
     @Override
+    public void validate(@Nonnull final InstanceIdentifier<? extends DataObject> id,
+                         @Nullable final DataObject dataBefore, @Nullable final DataObject dataAfter,
+                         @Nonnull final WriteContext ctx) throws DataValidationFailedException {
+        delegate.validate(id, dataBefore, dataAfter, ctx);
+    }
+
+    @Override
     public void processModification(
             @Nonnull final InstanceIdentifier<? extends DataObject> id,
             @Nullable final DataObject dataBefore,