org.apache.calcite.adapter.file

Class CsvEnumerator<E>

java.lang.Object

org.apache.calcite.adapter.file.CsvEnumerator<E>

Type Parameters:

E - Row type

All Implemented Interfaces:

AutoCloseable, org.apache.calcite.linq4j.Enumerator<E>

public class CsvEnumerator<E>
extends Object
implements org.apache.calcite.linq4j.Enumerator<E>

Enumerator that reads from a CSV file.

Constructor Summary

Constructors

Constructor and Description
CsvEnumerator(org.apache.calcite.util.Source source, AtomicBoolean cancelFlag, boolean stream, @Nullable String[] filterValues, org.apache.calcite.adapter.file.CsvEnumerator.RowConverter<E> rowConverter)
CsvEnumerator(org.apache.calcite.util.Source source, AtomicBoolean cancelFlag, List<org.apache.calcite.rel.type.RelDataType> fieldTypes, List<Integer> fields)

Method Summary

Modifier and Type	Method and Description
static org.apache.calcite.adapter.file.CsvEnumerator.RowConverter<Object[]>	arrayConverter(List<org.apache.calcite.rel.type.RelDataType> fieldTypes, List<Integer> fields, boolean stream)
void	close()
E	current()
static org.apache.calcite.rel.type.RelDataType	deduceRowType(org.apache.calcite.adapter.java.JavaTypeFactory typeFactory, org.apache.calcite.util.Source source, @Nullable List<org.apache.calcite.rel.type.RelDataType> fieldTypes, Boolean stream) Deduces the names and types of a table's columns by reading the first line of a CSV file.
static int[]	identityList(int n) Returns an array of integers {0, ..., n - 1}.
boolean	moveNext()
protected static BigDecimal	parseDecimal(int precision, int scale, String string)
void	reset()

Methods inherited from class java.lang.Object

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

Constructor Detail

CsvEnumerator

public CsvEnumerator(org.apache.calcite.util.Source source,
                     AtomicBoolean cancelFlag,
                     List<org.apache.calcite.rel.type.RelDataType> fieldTypes,
                     List<Integer> fields)

CsvEnumerator

public CsvEnumerator(org.apache.calcite.util.Source source,
                     AtomicBoolean cancelFlag,
                     boolean stream,
                     @Nullable String[] filterValues,
                     org.apache.calcite.adapter.file.CsvEnumerator.RowConverter<E> rowConverter)

Method Detail

arrayConverter

public static org.apache.calcite.adapter.file.CsvEnumerator.RowConverter<Object[]> arrayConverter(List<org.apache.calcite.rel.type.RelDataType> fieldTypes,
                                                                                                  List<Integer> fields,
                                                                                                  boolean stream)

deduceRowType

public static org.apache.calcite.rel.type.RelDataType deduceRowType(org.apache.calcite.adapter.java.JavaTypeFactory typeFactory,
                                                                    org.apache.calcite.util.Source source,
                                                                    @Nullable List<org.apache.calcite.rel.type.RelDataType> fieldTypes,
                                                                    Boolean stream)

Deduces the names and types of a table's columns by reading the first line of a CSV file.

current

public E current()

Specified by:

current in interface org.apache.calcite.linq4j.Enumerator<E>

moveNext

public boolean moveNext()

Specified by:

moveNext in interface org.apache.calcite.linq4j.Enumerator<E>

reset

public void reset()

Specified by:

reset in interface org.apache.calcite.linq4j.Enumerator<E>

close

public void close()

Specified by:

close in interface AutoCloseable

Specified by:

close in interface org.apache.calcite.linq4j.Enumerator<E>

identityList

public static int[] identityList(int n)

Returns an array of integers {0, ..., n - 1}.

parseDecimal

protected static BigDecimal parseDecimal(int precision,
                                         int scale,
                                         String string)