Package org.infinispan.protostream
Interface UnknownFieldSet
- All Superinterfaces:
Serializable
- All Known Implementing Classes:
UnknownFieldSetImpl
UnknownFieldSet
keeps track of fields seen during parsing of a protocol message but whose field numbers are
not recognized by the user provided marshallers (are never requested by them). This usually occurs when new fields
are added to a message type and then messages containing those fields are read by old versions of software that was
built before the new fields were added.
This is also used to handle the case when fields are requested in a different order than they were written to the stream (lowers performance but still works). In this case all fields that are encountered while parsing the stream up to the point where the requested field is finally encountered are cached/buffered in this data structure.
Instances of UnknownFieldSet are never to be created by the user. They will be created by the library and handed over
to the message marshaller via the UnknownFieldSetHandler
mechanism. Instances are serializable according to
Java serialization.
- Since:
- 1.0
- Author:
- [email protected]
-
Method Summary
Modifier and TypeMethodDescription<A> A
consumeTag
(int tag) Reads and removes a field value from the set.boolean
hasTag
(int tag) Checks if a tag is present.boolean
isEmpty()
Checks if there are any fields in this set.void
putVarintField
(int tag, int value) Convenience method for merging a new field containing a single varint value.void
readAllFields
(TagReader input) Parse an entire message frominput
and merge its fields into this set.boolean
readSingleField
(int tag, TagReader input) Parse a single field frominput
and merge it into this set.void
Writes all fields from this set to theoutput
stream.
-
Method Details
-
isEmpty
boolean isEmpty()Checks if there are any fields in this set. -
readAllFields
Parse an entire message frominput
and merge its fields into this set.- Throws:
IOException
-
readSingleField
Parse a single field frominput
and merge it into this set.- Parameters:
tag
- The field's tag number, which was already parsed (tag contains both field id and wire type).- Returns:
false
if the tag is an end group tag.- Throws:
IOException
-
putVarintField
void putVarintField(int tag, int value) Convenience method for merging a new field containing a single varint value. This is used in particular when an unknown enum value is encountered.- Parameters:
tag
- the field tag (containing both field id and wire type).
-
writeTo
Writes all fields from this set to theoutput
stream.- Throws:
IOException
-
consumeTag
<A> A consumeTag(int tag) Reads and removes a field value from the set. The field is specified as a tag value composed of the numeric id of the field and the wire type. It's possible that the tag has repeated values; in that case the first one is returned.- Type Parameters:
A
- The expected type of the tag value.- Parameters:
tag
- the field tag (containing both field id and wire type).- Returns:
- the first seen value or null if the tag was not found.
-
hasTag
boolean hasTag(int tag) Checks if a tag is present.- Parameters:
tag
- the field tag (containing both field id and wire type).- Returns:
- true if present, false otherwise
-