com.google.cloud.dataflow.sdk.io

Class TextIO.Read.Bound<T>

java.lang.Object

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

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

Type Parameters:

T - the type of each of the elements of the resulting PCollection. By default, each line is returned as a String, however you may use withCoder(Coder) to supply a Coder<T> to produce a PCollection<T> instead.

All Implemented Interfaces:

HasDisplayData, Serializable

Enclosing class:

TextIO.Read

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

A PTransform that reads from one or more text files and returns a bounded PCollection containing one element for each line of the input files.

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.
TextIO.Read.Bound<T>	from(String filepattern) Returns a new transform for reading from text files that's like this one but that reads from the file(s) with the given name or pattern.
TextIO.Read.Bound<T>	from(ValueProvider<String> filepattern) Same as from(filepattern), but accepting a ValueProvider.
TextIO.CompressionType	getCompressionType()
protected Coder<T>	getDefaultOutputCoder() Returns the default Coder to use for the output of this single-output PTransform.
String	getFilepattern()
protected FileBasedSource<T>	getSource()
TextIO.Read.Bound<T>	named(String name) Returns a new transform for reading from text files that's like this one but with the given step name.
boolean	needsValidation()
void	populateDisplayData(DisplayData.Builder builder) Register display data for the given transform or component.
<X> TextIO.Read.Bound<X>	withCoder(Coder<X> coder) Returns a new transform for reading from text files that's like this one but that uses the given Coder to decode each of the lines of the file into a value of type X.
TextIO.Read.Bound<T>	withCompressionType(TextIO.CompressionType compressionType) Returns a new transform for reading from text files that's like this one but reads from input sources using the specified compression type.
TextIO.Read.Bound<T>	withoutValidation() Returns a new transform for reading from text files that's like this one but that has GCS path validation on pipeline creation disabled.

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 TextIO.Read.Bound<T> named(String name)

Returns a new transform for reading from text files that's like this one but with the given step name.

Does not modify this object.

from

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

Returns a new transform for reading from text files that's like this one but that reads from the file(s) with the given name or pattern. See TextIO.Read.from(java.lang.String) for a description of filepatterns.

Does not modify this object.

from

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

Same as from(filepattern), but accepting a ValueProvider.

withCoder

public <X> TextIO.Read.Bound<X> withCoder(Coder<X> coder)

Returns a new transform for reading from text files that's like this one but that uses the given Coder to decode each of the lines of the file into a value of type X.

Does not modify this object.

Type Parameters:

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

withoutValidation

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

Returns a new transform for reading from text files that's like this one but that has GCS path validation on pipeline creation disabled.

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

Does not modify this object.

withCompressionType

public TextIO.Read.Bound<T> withCompressionType(TextIO.CompressionType compressionType)

Returns a new transform for reading from text files that's like this one but reads from input sources using the specified compression type.

If no compression type is specified, the default is TextIO.CompressionType.AUTO. See TextIO.Read.withCompressionType(com.google.cloud.dataflow.sdk.io.TextIO.CompressionType) for more details.

Does not modify this object.

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>>

getSource

protected FileBasedSource<T> getSource()

populateDisplayData

public void populateDisplayData(DisplayData.Builder builder)

Description copied from class: PTransform

Register display data for the given transform or component.

populateDisplayData(DisplayData.Builder) is invoked by Pipeline runners to collect display data via DisplayData.from(HasDisplayData). Implementations may call super.populateDisplayData(builder) in order to register display data in the current namespace, but should otherwise use subcomponent.populateDisplayData(builder) to use the namespace of the subcomponent.

By default, does not register any display data. Implementors may override this method to provide their own display data.

Specified by:

populateDisplayData in interface HasDisplayData

Overrides:

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

Parameters:

builder - The builder to populate with display data.

See Also:

HasDisplayData

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()

needsValidation

public boolean needsValidation()

getCompressionType

public TextIO.CompressionType getCompressionType()