com.google.cloud.dataflow.sdk.io

Class AvroIO.Read.Bound<T>

java.lang.Object

com.google.cloud.dataflow.sdk.transforms.PTransform<PInput,PCollection<T>>

com.google.cloud.dataflow.sdk.io.AvroIO.Read.Bound<T>

Type Parameters:

T - the type of each of the elements of the resulting PCollection

All Implemented Interfaces:

Serializable

Enclosing class:

AvroIO.Read

public static class AvroIO.Read.Bound<T>
extends PTransform<PInput,PCollection<T>>

A PTransform that reads from an Avro file (or multiple Avro files matching a pattern) and returns a bounded PCollection containing the decoding of each record.

See Also:

Serialized Form

Field Summary

Fields inherited from class com.google.cloud.dataflow.sdk.transforms.PTransform

name

Method Summary

Modifier and Type	Method and Description
PCollection<T>	apply(PInput input) Applies this PTransform on the given InputT, and returns its Output.
AvroIO.Read.Bound<T>	from(String filepattern) Returns a new AvroIO.Read PTransform that's like this one but that reads from the file(s) with the given name or pattern.
protected Coder<T>	getDefaultOutputCoder() Returns the default Coder to use for the output of this single-output PTransform.
String	getFilepattern()
org.apache.avro.Schema	getSchema()
AvroIO.Read.Bound<T>	named(String name) Returns a new AvroIO.Read PTransform that's like this one but with the given step name.
boolean	needsValidation()
AvroIO.Read.Bound<T>	withoutValidation() Returns a new TextIO.Read PTransform that's like this one but that has GCS input path validation on pipeline creation disabled.
<X> AvroIO.Read.Bound<X>	withSchema(Class<X> type) Returns a new AvroIO.Read PTransform that's like this one but that reads Avro file(s) containing records whose type is the specified Avro-generated class.
AvroIO.Read.Bound<org.apache.avro.generic.GenericRecord>	withSchema(org.apache.avro.Schema schema) Returns a new AvroIO.Read PTransform that's like this one but that reads Avro file(s) containing records of the specified schema.
AvroIO.Read.Bound<org.apache.avro.generic.GenericRecord>	withSchema(String schema) Returns a new AvroIO.Read PTransform that's like this one but that reads Avro file(s) containing records of the specified schema in a JSON-encoded string form.

Methods inherited from class com.google.cloud.dataflow.sdk.transforms.PTransform

getDefaultOutputCoder, getDefaultOutputCoder, getKindString, getName, toString, validate

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Method Detail

named

public AvroIO.Read.Bound<T> named(String name)

Returns a new AvroIO.Read PTransform that's like this one but with the given step name. Does not modify this object.

from

public AvroIO.Read.Bound<T> from(String filepattern)

Returns a new AvroIO.Read PTransform that's like this one but that reads from the file(s) with the given name or pattern. (See AvroIO.Read.from(java.lang.String) for a description of filepatterns.) Does not modify this object.

withSchema

public <X> AvroIO.Read.Bound<X> withSchema(Class<X> type)

Returns a new AvroIO.Read PTransform that's like this one but that reads Avro file(s) containing records whose type is the specified Avro-generated class. Does not modify this object.

Type Parameters:

X - the type of the decoded elements, and the elements of the resulting PCollection

withSchema

public AvroIO.Read.Bound<org.apache.avro.generic.GenericRecord> withSchema(org.apache.avro.Schema schema)

Returns a new AvroIO.Read PTransform that's like this one but that reads Avro file(s) containing records of the specified schema. Does not modify this object.

withSchema

public AvroIO.Read.Bound<org.apache.avro.generic.GenericRecord> withSchema(String schema)

Returns a new AvroIO.Read PTransform that's like this one but that reads Avro file(s) containing records of the specified schema in a JSON-encoded string form. Does not modify this object.

withoutValidation

public AvroIO.Read.Bound<T> withoutValidation()

Returns a new TextIO.Read PTransform that's like this one but that has GCS input path validation on pipeline creation disabled. Does not modify this object.

This can be useful in the case where the GCS input location does not exist at the pipeline creation time, but is expected to be available at execution time.

apply

public PCollection<T> apply(PInput input)

Description copied from class: PTransform

Applies this PTransform on the given InputT, and returns its Output.

Composite transforms, which are defined in terms of other transforms, should return the output of one of the composed transforms. Non-composite transforms, which do not apply any transforms internally, should return a new unbound output and register evaluators (via backend-specific registration methods).

The default implementation throws an exception. A derived class must either implement apply, or else each runner must supply a custom implementation via PipelineRunner.apply(com.google.cloud.dataflow.sdk.transforms.PTransform<InputT, OutputT>, InputT).

Overrides:

apply in class PTransform<PInput,PCollection<T>>

getDefaultOutputCoder

protected Coder<T> getDefaultOutputCoder()

Description copied from class: PTransform

Returns the default Coder to use for the output of this single-output PTransform.

By default, always throws

Overrides:

getDefaultOutputCoder in class PTransform<PInput,PCollection<T>>

getFilepattern

public String getFilepattern()

getSchema

public org.apache.avro.Schema getSchema()

needsValidation

public boolean needsValidation()