org.apache.calcite.runtime

Class Enumerables

java.lang.Object

org.apache.calcite.runtime.Enumerables

public class Enumerables
extends Object

Utilities for processing Enumerable collections.

This class is a place to put things not yet added to linq4j. Methods are subject to removal without notice.

Field Summary

Fields

Modifier and Type	Field and Description
private static Function1<Object[],Row>	ARRAY_TO_ROW
private static Function1<?,?>	SLICE

Constructor Summary

Constructors

Modifier	Constructor and Description
private	Enumerables()

Method Summary

Modifier and Type	Method and Description
static <E> Enumerable<E>	slice0(Enumerable<E[]> enumerable) Converts an enumerable over singleton arrays into the enumerable of their first elements.
static Enumerable<Row>	toRow(Enumerable<Object[]> enumerable) Converts an Enumerable over object arrays into an Enumerable over Row objects.
static com.google.common.base.Supplier<Enumerable<Row>>	toRow(com.google.common.base.Supplier<Enumerable<Object[]>> supplier) Converts a supplier of an Enumerable over object arrays into a supplier of an Enumerable over Row objects.

Methods inherited from class java.lang.Object

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

Field Detail

SLICE

private static final Function1<?,?> SLICE

ARRAY_TO_ROW

private static final Function1<Object[],Row> ARRAY_TO_ROW

Constructor Detail

Enumerables

private Enumerables()

Method Detail

slice0

public static <E> Enumerable<E> slice0(Enumerable<E[]> enumerable)

Converts an enumerable over singleton arrays into the enumerable of their first elements.

toRow

public static Enumerable<Row> toRow(Enumerable<Object[]> enumerable)

Converts an Enumerable over object arrays into an Enumerable over Row objects.

toRow

public static com.google.common.base.Supplier<Enumerable<Row>> toRow(com.google.common.base.Supplier<Enumerable<Object[]>> supplier)

Converts a supplier of an Enumerable over object arrays into a supplier of an Enumerable over Row objects.