Package org.apache.beam.sdk.io.csv

Class CsvIOParse<T>

java.lang.Object

org.apache.beam.sdk.transforms.PTransform<PCollection<String>,CsvIOParseResult<T>>

org.apache.beam.sdk.io.csv.CsvIOParse<T>

All Implemented Interfaces:

Serializable, HasDisplayData

public abstract class CsvIOParse<T>
extends PTransform<PCollection<String>,CsvIOParseResult<T>>

PTransform for Parsing CSV Record Strings into Schema-mapped target types. CsvIOParse is not instantiated directly but via CsvIO.parse(java.lang.Class<T>, org.apache.commons.csv.CSVFormat) or CsvIO.parseRows(org.apache.beam.sdk.schemas.Schema, org.apache.commons.csv.CSVFormat).

See Also:

• Serialized Form

Field Summary

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

annotations, displayData, name, resourceHints

Constructor Summary

Constructors

Constructor	Description
CsvIOParse()

Method Summary

Modifier and Type	Method	Description
CsvIOParseResult<T>	expand(PCollection<String> input)	Override this method to specify how this PTransform should be expanded on the given InputT.
<OutputT extends @NonNull Object> CsvIOParse<T>	withCustomRecordParsing(String fieldName, SerializableFunction<String,OutputT> customRecordParsingFn)	Configures custom cell parsing.

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

addAnnotation, compose, compose, getAdditionalInputs, getAnnotations, getDefaultOutputCoder, getDefaultOutputCoder, getDefaultOutputCoder, getKindString, getName, getResourceHints, populateDisplayData, setDisplayData, setResourceHints, toString, validate, validate

Methods inherited from class java.lang.Object

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

Constructor Details

CsvIOParse

public CsvIOParse()

Method Details

withCustomRecordParsing

public <OutputT extends @NonNull Object>
CsvIOParse<T> withCustomRecordParsing(String fieldName,
 SerializableFunction<String,OutputT> customRecordParsingFn)

Configures custom cell parsing.

Example

 CsvIO.parse().withCustomRecordParsing("listOfInts", cell-> {

  List<Integer> result = new ArrayList<>();
  for (String stringValue: Splitter.on(";").split(cell)) {
    result.add(Integer.parseInt(stringValue));
  }

 });
 

expand

public CsvIOParseResult<T> expand(PCollection<String> input)

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<String>,CsvIOParseResult<T>>