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-rw-r--r--infra/translate-api/src/main/java/io/fd/honeycomb/translate/read/Reader.java15
1 files changed, 15 insertions, 0 deletions
diff --git a/infra/translate-api/src/main/java/io/fd/honeycomb/translate/read/Reader.java b/infra/translate-api/src/main/java/io/fd/honeycomb/translate/read/Reader.java
index dd9944624..7138006e0 100644
--- a/infra/translate-api/src/main/java/io/fd/honeycomb/translate/read/Reader.java
+++ b/infra/translate-api/src/main/java/io/fd/honeycomb/translate/read/Reader.java
@@ -35,6 +35,21 @@ public interface Reader<D extends DataObject, B extends Builder<D>> extends Subt
// TODO HONEYCOMB-169 make async
/**
+ * Check whether the data from current reader are present or not.
+ * Invoked after {@link #readCurrentAttributes(InstanceIdentifier, Builder, ReadContext)}
+ *
+ * @param id Keyed instance identifier of read data
+ * @param built Read data as returned from builder
+ * after {@link #readCurrentAttributes(InstanceIdentifier, Builder, ReadContext)} invocation
+ * @param ctx Read context
+ *
+ *
+ * @return true if the result value is present.
+ */
+ boolean isPresent(@Nonnull InstanceIdentifier<D> id, @Nonnull D built, @Nonnull ReadContext ctx)
+ throws ReadFailedException;
+
+ /**
* Reads data identified by id
*
* @param id unique identifier of subtree to be read. The subtree must contain managed data object type. For