org.apache.beam.sdk.transforms

Class Regex.Split

java.lang.Object

org.apache.beam.sdk.transforms.PTransform<PCollection<java.lang.String>,PCollection<java.lang.String>>

org.apache.beam.sdk.transforms.Regex.Split

All Implemented Interfaces:

java.io.Serializable, HasDisplayData

Enclosing class:

Regex

public static class Regex.Split
extends PTransform<PCollection<java.lang.String>,PCollection<java.lang.String>>

Regex.Split<String> takes a PCollection<String> and returns a PCollection<String> with the input string split into individual items in a list. Each item is then output as a separate string.

This transform runs a Regex as part of a splint the entire input line. The split gives back an array of items. Each item is output as a separate item in the PCollection<String>.

Depending on the Regex, a split can be an empty or "" string. You can pass in a parameter if you want empty strings or not.

Example of use:

 PCollection<String> words = ...;
 PCollection<String> values =
     words.apply(Regex.split("\W*"));
 

See Also:

Serialized Form

Field Summary

Fields inherited from class org.apache.beam.sdk.transforms.PTransform

name

Constructor Summary

Constructors

Constructor and Description
Split(java.util.regex.Pattern pattern, boolean outputEmpty)

Method Summary

Modifier and Type	Method and Description
PCollection<java.lang.String>	expand(PCollection<java.lang.String> in) Override this method to specify how this PTransform should be expanded on the given InputT.

Methods inherited from class org.apache.beam.sdk.transforms.PTransform

getAdditionalInputs, getDefaultOutputCoder, getDefaultOutputCoder, getDefaultOutputCoder, getKindString, getName, populateDisplayData, toString, validate

Methods inherited from class java.lang.Object

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

Constructor Detail

Split

public Split(java.util.regex.Pattern pattern,
             boolean outputEmpty)

Method Detail

expand

public PCollection<java.lang.String> expand(PCollection<java.lang.String> in)

Description copied from class: PTransform

Override this method to specify how this PTransform should be expanded on the given InputT.

NOTE: This method should not be called directly. Instead apply the PTransform should be applied to the InputT using the apply method.

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).

Specified by:

expand in class PTransform<PCollection<java.lang.String>,PCollection<java.lang.String>>