org.embulk.util.guess

Class SchemaGuess

java.lang.Object

org.embulk.util.guess.SchemaGuess

public final class SchemaGuess
extends Object

Guesses a schema from sample objects.

It reimplements SchemaGuess in /embulk/guess/schema_guess.rb.

See Also:

schema_guess.rb

Method Summary

Modifier and Type	Method and Description
List<ConfigDiff>	fromLinkedHashMapRecords(List<LinkedHashMap<String,Object>> listOfMap) Guesses a schema from a list of sample records in LinkedHashMaps.
List<ConfigDiff>	fromListRecords(List<String> columnNames, List<List<Object>> samples) Guesses a schema from a list of sample records in LinkedHashMaps.
static SchemaGuess	of(ConfigMapperFactory configMapperFactory)

Methods inherited from class java.lang.Object

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

Method Detail

of

public static SchemaGuess of(ConfigMapperFactory configMapperFactory)

fromLinkedHashMapRecords

public List<ConfigDiff> fromLinkedHashMapRecords(List<LinkedHashMap<String,Object>> listOfMap)

Guesses a schema from a list of sample records in LinkedHashMaps.

It returns a list of ConfigDiff in contrast to the original Ruby method returning Schema,

Note that it assumes LinkedHashMap because an order matters in schema.

Parameters:

listOfMap - a list of LinkedHashMaps which represent a record for each

Returns:

a list of ConfigDiffs of the schema guessed

fromListRecords

public List<ConfigDiff> fromListRecords(List<String> columnNames,
                                        List<List<Object>> samples)

Guesses a schema from a list of sample records in LinkedHashMaps.

It returns a list of ConfigDiff in contrast to the original Ruby method returning Schema,

Parameters:

columnNames - a list of column names in order

samples - a list of sample data

Returns:

a list of ConfigDiffs of the schema guessed