org.apache.beam.sdk.extensions.sql.impl.schema

Class BeamTableUtils

java.lang.Object

org.apache.beam.sdk.extensions.sql.impl.schema.BeamTableUtils

public final class BeamTableUtils
extends java.lang.Object

Utility methods for working with BeamTable.

TODO: Does not yet support nested types.

Constructor Summary

Constructors

Constructor and Description
BeamTableUtils()

Method Summary

Modifier and Type	Method and Description
static java.lang.Object	autoCastField(Schema.Field field, java.lang.Object rawObj) Attempt to cast an object to a specified Schema.Field.Type.
static java.lang.String	beamRow2CsvLine(Row row, org.apache.commons.csv.CSVFormat csvFormat)
static java.lang.Iterable<Row>	csvLines2BeamRows(org.apache.commons.csv.CSVFormat csvFormat, java.lang.String line, Schema schema) Decode zero or more CSV records from the given string, according to the specified CSVFormat, and converts them to Rows with the specified Schema.

Methods inherited from class java.lang.Object

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

Constructor Detail

BeamTableUtils

public BeamTableUtils()

Method Detail

csvLines2BeamRows

public static java.lang.Iterable<Row> csvLines2BeamRows(org.apache.commons.csv.CSVFormat csvFormat,
                                                        java.lang.String line,
                                                        Schema schema)

Decode zero or more CSV records from the given string, according to the specified CSVFormat, and converts them to Rows with the specified Schema.

A single "line" read from e.g. TextIO can have zero or more records, depending on whether the line was split on the same characters that delimite CSV records, and whether the CSVFormat ignores blank lines.

beamRow2CsvLine

public static java.lang.String beamRow2CsvLine(Row row,
                                               org.apache.commons.csv.CSVFormat csvFormat)

autoCastField

public static java.lang.Object autoCastField(Schema.Field field,
                                             java.lang.Object rawObj)

Attempt to cast an object to a specified Schema.Field.Type.

Returns:

The casted object in Schema.Field.Type.

Throws:

java.lang.IllegalArgumentException - if the value cannot be cast to that type.