ObjectInputStream(FileInputStream(file)). Now time to read the family back into memory kotlin. We can create one using jacksonObjectMapper (): import. ObjectOutputStream(FileOutputStream(file)).use In order to serialize and deserialize objects, we’ll need to have an instance of ObjectMapper for Kotlin. We use the class ObjectOutputStream to serialize a file and then ObjectInputStream to restore an object. By default, our template supports writing Android code using Kotlin. The serialization mechanism converts an object into bytes and then writes the object to the output stream. The serialization and deserialization of these values to and from messages happens. You have to remember that since fields in Proto3 messages by default are implicitly optional, corresponding Kotlin properties have to be nullable with default value null.Whenever a class implements Serializable, it’s a candidate for object serialization. In the below data class, for example using aggregation to get the data, the transient field is expected to return a value from mongodb data. However, other messages could be decoded. This implementation does not support repeated packed fields, so you won't be able to deserialize Proto3 lists. However, this implementation supports standard rialization's polymorphic and sealed serializers, using their default form (message of serialName: string and other embedded message with actual content). There's no special support for oneof protobuf fields. Because format spec says that if the list is empty, there are no elements in the stream with such tag, you must explicitly mark any field of list type with default = emptyList(). Lists are represented as repeated fields. This behaviour can be changed via ProtoType annotation. to avoid breaking changes when reordering properties), provide custom ids using ProtoNumber annotation.īy default, all integer numbers are encoded using varint encoding. the first property in the class has id 1, the second has id 2, and so forth.
By default, protobuf fields ids are being assigned to Kotlin properties in incremental order, i.e.
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