water.parser

Class DefaultParserProviders.ArffParserProvider

java.lang.Object

water.parser.ParserProvider

water.parser.DefaultParserProviders.ArffParserProvider

Enclosing class:

DefaultParserProviders

public static final class DefaultParserProviders.ArffParserProvider
extends ParserProvider

Constructor Summary

Constructors

Constructor and Description
ArffParserProvider()

Method Summary

Modifier and Type	Method and Description
Parser	createParser(ParseSetup setup, Key<Job> jobKey) Create a new parser
ParseSetup	createParserSetup(Key[] inputs, ParseSetup requiredSetup) Create a parser specific setup.
ParseSetup	guessInitSetup(ByteVec v, byte[] bits, ParseSetup ps) Constructs initial ParseSetup from a given user setup Any exception thrown by this method will signal that this ParserProvider doesn't support the input data.
ParserInfo	info() Technical information for this parser

Methods inherited from class water.parser.ParserProvider

guessFinalSetup, guessSetup_impl, guessSetup, guessSetup, setupLocal

Methods inherited from class java.lang.Object

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

Constructor Detail

ArffParserProvider

public ArffParserProvider()

Method Detail

info

public ParserInfo info()

Description copied from class: ParserProvider

Technical information for this parser

Specified by:

info in class ParserProvider

createParser

public Parser createParser(ParseSetup setup,
                           Key<Job> jobKey)

Description copied from class: ParserProvider

Create a new parser

Specified by:

createParser in class ParserProvider

guessInitSetup

public ParseSetup guessInitSetup(ByteVec v,
                                 byte[] bits,
                                 ParseSetup ps)

Description copied from class: ParserProvider

Constructs initial ParseSetup from a given user setup Any exception thrown by this method will signal that this ParserProvider doesn't support the input data. Parsers of data formats that provide metadata (eg. a binary file formats like Parquet) should use the file metadata to identify the parse type and possibly other properties of the ParseSetup that can be determined just from the metadata itself. The goal should be perform the least amount of operations to correctly determine the ParseType (any exception means - format is not supported!). Note: Some file formats like CSV don't provide any metadata. In that case this method can return the final ParseSetup.

Overrides:

guessInitSetup in class ParserProvider

Parameters:

v - optional ByteVec

bits - first bytes of the file

ps - user specified setup

Returns:

null if this Provider cannot provide a parser for this file, otherwise an instance of ParseSetup with correct setting of ParseSetup._parse_type

createParserSetup

public ParseSetup createParserSetup(Key[] inputs,
                                    ParseSetup requiredSetup)

Description copied from class: ParserProvider

Create a parser specific setup. Useful if parser need a single

Specified by:

createParserSetup in class ParserProvider

Parameters:

inputs - input keys

requiredSetup - user given parser setup

Returns:

parser specific setup