Package org.apache.calcite.runtime

Class SqlFunctions.ProductComparableListEnumerator<E extends java.lang.Comparable>

java.lang.Object

org.apache.calcite.linq4j.CartesianProductEnumerator<java.util.List<E>,FlatLists.ComparableList<E>>

org.apache.calcite.runtime.SqlFunctions.ProductComparableListEnumerator<E>

Type Parameters:

E - element type

All Implemented Interfaces:

java.lang.AutoCloseable, Enumerator<FlatLists.ComparableList<E>>

Enclosing class:

SqlFunctions

private static class SqlFunctions.ProductComparableListEnumerator<E extends java.lang.Comparable>
extends CartesianProductEnumerator<java.util.List<E>,FlatLists.ComparableList<E>>

Enumerates over the cartesian product of the given lists, returning a comparable list for each row.

Field Summary

Fields

Modifier and Type	Field	Description
(package private) E[]	flatElements
(package private) java.util.List<E>	list
private int	ordinality
private boolean	withOrdinality

Fields inherited from class org.apache.calcite.linq4j.CartesianProductEnumerator

elements

Constructor Summary

Constructors

Constructor	Description
ProductComparableListEnumerator(java.util.List<Enumerator<java.util.List<E>>> enumerators, int fieldCount, boolean withOrdinality)

Method Summary

Modifier and Type	Method	Description
FlatLists.ComparableList<E>	current()	Gets the current element in the collection.

Methods inherited from class org.apache.calcite.linq4j.CartesianProductEnumerator

close, moveNext, reset

Methods inherited from class java.lang.Object

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

Field Detail

flatElements

final E extends java.lang.Comparable[] flatElements

list

final java.util.List<E extends java.lang.Comparable> list

withOrdinality

private final boolean withOrdinality

ordinality

private int ordinality

Constructor Detail

ProductComparableListEnumerator

ProductComparableListEnumerator(java.util.List<Enumerator<java.util.List<E>>> enumerators,
                                int fieldCount,
                                boolean withOrdinality)

Method Detail

current

public FlatLists.ComparableList<E> current()

Description copied from interface: Enumerator

Gets the current element in the collection.

After an enumerator is created or after the Enumerator.reset() method is called, the Enumerator.moveNext() method must be called to advance the enumerator to the first element of the collection before reading the value of the current property; otherwise, current is undefined.

This method also throws NoSuchElementException if the last call to moveNext returned false, which indicates the end of the collection.

This method does not move the position of the enumerator, and consecutive calls to current return the same object until either moveNext or reset is called.

An enumerator remains valid as long as the collection remains unchanged. If changes are made to the collection, such as adding, modifying, or deleting elements, the enumerator is irrecoverably invalidated. The next call to moveNext or reset may, at the discretion of the implementation, throw a ConcurrentModificationException. If the collection is modified between moveNext and current, current returns the element that it is set to, even if the enumerator is already invalidated.

Returns:

Current element