Package org.apache.avro

Avro kernel classes.

See: Description

Class Summary

Class	Description
JsonProperties	Base class for objects that have Json-valued properties.
Protocol	A set of messages forming an application protocol.
Schema	An abstract data type.
Schema.Field	A field within a record.
Schema.Parser	A parser for JSON-format schemas.
SchemaBuilder	A fluent interface for building Schema instances.
SchemaBuilder.ArrayBuilder<R>	Builds an Avro Array type with optional properties.
SchemaBuilder.ArrayDefault<R>	Choose whether to use a default value for the field or not.
SchemaBuilder.BaseFieldTypeBuilder<R>	A special Builder for Record fields.
SchemaBuilder.BaseTypeBuilder<R>	A common API for building types within a context.
SchemaBuilder.BooleanBuilder<R>	Builds an Avro boolean type with optional properties.
SchemaBuilder.BooleanDefault<R>	Choose whether to use a default value for the field or not.
SchemaBuilder.BytesBuilder<R>	Builds an Avro bytes type with optional properties.
SchemaBuilder.BytesDefault<R>	Choose whether to use a default value for the field or not.
SchemaBuilder.DoubleBuilder<R>	Builds an Avro double type with optional properties.
SchemaBuilder.DoubleDefault<R>	Choose whether to use a default value for the field or not.
SchemaBuilder.EnumBuilder<R>	Builds an Avro Enum type with optional properties, namespace, doc, and aliases.
SchemaBuilder.EnumDefault<R>	Choose whether to use a default value for the field or not.
SchemaBuilder.FieldAssembler<R>
SchemaBuilder.FieldBuilder<R>	Builds a Field in the context of a SchemaBuilder.FieldAssembler.
SchemaBuilder.FieldDefault<R,S extends SchemaBuilder.FieldDefault<R,S>>	Abstract base class for field defaults.
SchemaBuilder.FieldTypeBuilder<R>	FieldTypeBuilder adds SchemaBuilder.FieldTypeBuilder.unionOf(), SchemaBuilder.FieldTypeBuilder.nullable(), and SchemaBuilder.FieldTypeBuilder.optional() to BaseFieldTypeBuilder.
SchemaBuilder.FixedBuilder<R>	Builds an Avro Fixed type with optional properties, namespace, doc, and aliases.
SchemaBuilder.FixedDefault<R>	Choose whether to use a default value for the field or not.
SchemaBuilder.FloatBuilder<R>	Builds an Avro float type with optional properties.
SchemaBuilder.FloatDefault<R>	Choose whether to use a default value for the field or not.
SchemaBuilder.GenericDefault<R>
SchemaBuilder.IntBuilder<R>	Builds an Avro int type with optional properties.
SchemaBuilder.IntDefault<R>	Choose whether to use a default value for the field or not.
SchemaBuilder.LongBuilder<R>	Builds an Avro long type with optional properties.
SchemaBuilder.LongDefault<R>	Choose whether to use a default value for the field or not.
SchemaBuilder.MapBuilder<R>	Builds an Avro Map type with optional properties.
SchemaBuilder.MapDefault<R>	Choose whether to use a default value for the field or not.
SchemaBuilder.NamedBuilder<S extends SchemaBuilder.NamedBuilder<S>>	An abstract type that provides builder methods for configuring the name, doc, and aliases of all Avro types that have names (fields, Fixed, Record, and Enum).
SchemaBuilder.NamespacedBuilder<R,S extends SchemaBuilder.NamespacedBuilder<R,S>>	An abstract type that provides builder methods for configuring the namespace for all Avro types that have namespaces (Fixed, Record, and Enum).
SchemaBuilder.NullBuilder<R>	Builds an Avro null type with optional properties.
SchemaBuilder.NullDefault<R>	Choose whether to use a default value for the field or not.
SchemaBuilder.PropBuilder<S extends SchemaBuilder.PropBuilder<S>>	An abstract builder for all Avro types.
SchemaBuilder.RecordBuilder<R>
SchemaBuilder.RecordDefault<R>	Choose whether to use a default value for the field or not.
SchemaBuilder.StringBldr<R>	Builds an Avro string type with optional properties.
SchemaBuilder.StringDefault<R>	Choose whether to use a default value for the field or not.
SchemaBuilder.TypeBuilder<R>	A Builder for creating any Avro schema type.
SchemaBuilder.UnionAccumulator<R>	Accumulates all of the types in a union.
SchemaBuilder.UnionFieldTypeBuilder<R>	Builder for a union field.
SchemaCompatibility	Evaluate the compatibility between a reader schema and a writer schema.
SchemaCompatibility.SchemaPairCompatibility	Provides information about the compatibility of a single reader and writer schema pair.
SchemaNormalization	Collection of static methods for generating the cannonical form of schemas (see SchemaNormalization.toParsingForm(org.apache.avro.Schema)) -- and fingerprints of cannonical forms (SchemaNormalization.fingerprint(java.lang.String, byte[])).

Enum Summary

Enum	Description
Schema.Field.Order	How values of this field should be ordered when sorting records.
Schema.Type	The type of a schema.
SchemaCompatibility.SchemaCompatibilityType	Identifies the type of a schema compatibility result.

Exception Summary

Exception	Description
AvroRemoteException	Base class for exceptions thrown to client by server.
AvroRuntimeException	Base Avro exception.
AvroTypeException	Thrown when an illegal type is used.
SchemaBuilderException	Thrown for errors building schemas.
SchemaParseException	Thrown for errors parsing schemas and protocols.
UnresolvedUnionException	Thrown when the expected contents of a union cannot be resolved.

Package org.apache.avro Description

Avro kernel classes.

A Schema provides an abstract definition of a data type.

The in-memory representation of data is determined by DatumReader and DatumWriter implementations. Generic implementations are provided in the org.apache.avro.generic package. A compiler can generate specific java classes and interfaces for schemas and protocols. Schemas may be automatically generated for existing Java classes by reflection using the org.apache.avro.reflect package.

Data of a given schema is always serialized identically, regardless of its in-memory representation, by traversing the schema and writing leaf values from the data structure with a Encoder. Deserializing similarly proceeds by traversing the schema, reading leaf values with a Decoder and storing them in an in-memory data structure.