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.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	Enumerables.Emitter<E,TResult> Given a match (a list of rows, and their states) produces a list of rows to be output.

Method Summary

Modifier and Type	Method and Description
static <E,TKey,TResult> org.apache.calcite.linq4j.Enumerable<TResult>	match(org.apache.calcite.linq4j.Enumerable<E> enumerable, org.apache.calcite.linq4j.function.Function1<E,TKey> keySelector, Matcher<E> matcher, Enumerables.Emitter<E,TResult> emitter, int history, int future)
static <E> org.apache.calcite.linq4j.Enumerable<E>	slice0(org.apache.calcite.linq4j.Enumerable<E[]> enumerable) Converts an enumerable over singleton arrays into the enumerable of their first elements.
static org.apache.calcite.linq4j.Enumerable<Row>	toRow(org.apache.calcite.linq4j.Enumerable<Object[]> enumerable) Converts an Enumerable over object arrays into an Enumerable over Row objects.
static Supplier<org.apache.calcite.linq4j.Enumerable<Row>>	toRow(Supplier<org.apache.calcite.linq4j.Enumerable<Object[]>> supplier) Converts a supplier of an Enumerable over object arrays into a supplier of an Enumerable over Row objects.
static com.google.common.base.Supplier<org.apache.calcite.linq4j.Enumerable<Row>>	toRow(com.google.common.base.Supplier<org.apache.calcite.linq4j.Enumerable<Object[]>> supplier) Deprecated.

Methods inherited from class java.lang.Object

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

Method Detail

slice0

public static <E> org.apache.calcite.linq4j.Enumerable<E> slice0(org.apache.calcite.linq4j.Enumerable<E[]> enumerable)

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

toRow

public static org.apache.calcite.linq4j.Enumerable<Row> toRow(org.apache.calcite.linq4j.Enumerable<Object[]> enumerable)

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

toRow

public static Supplier<org.apache.calcite.linq4j.Enumerable<Row>> toRow(Supplier<org.apache.calcite.linq4j.Enumerable<Object[]>> supplier)

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

toRow

@Deprecated
public static com.google.common.base.Supplier<org.apache.calcite.linq4j.Enumerable<Row>> toRow(com.google.common.base.Supplier<org.apache.calcite.linq4j.Enumerable<Object[]>> supplier)

Deprecated.

match

public static <E,TKey,TResult> org.apache.calcite.linq4j.Enumerable<TResult> match(org.apache.calcite.linq4j.Enumerable<E> enumerable,
                                                                                   org.apache.calcite.linq4j.function.Function1<E,TKey> keySelector,
                                                                                   Matcher<E> matcher,
                                                                                   Enumerables.Emitter<E,TResult> emitter,
                                                                                   int history,
                                                                                   int future)