org.apache.calcite.avatica.util

Class IteratorCursor<E>

java.lang.Object

org.apache.calcite.avatica.util.AbstractCursor

org.apache.calcite.avatica.util.PositionedCursor<E>

org.apache.calcite.avatica.util.IteratorCursor<E>

Type Parameters:

E - Element type

All Implemented Interfaces:

AutoCloseable, Cursor

Direct Known Subclasses:

ArrayIteratorCursor, ListIteratorCursor, MapIteratorCursor, RecordIteratorCursor

public abstract class IteratorCursor<E>
extends PositionedCursor<E>

Implementation of Cursor on top of an Iterator that returns a record for each row. The returned record is cached to avoid multiple computations of current row.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
private static class	IteratorCursor.Position Are we positioned on a valid row?

Nested classes/interfaces inherited from class org.apache.calcite.avatica.util.PositionedCursor

PositionedCursor.ArrayGetter, PositionedCursor.FieldGetter, PositionedCursor.ListGetter, PositionedCursor.MapGetter<K>, PositionedCursor.ObjectGetter

Nested classes/interfaces inherited from class org.apache.calcite.avatica.util.AbstractCursor

AbstractCursor.AbstractGetter, AbstractCursor.AccessorImpl, AbstractCursor.ArrayAccessor, AbstractCursor.Getter, AbstractCursor.NumberAccessor, AbstractCursor.SlotGetter, AbstractCursor.StructGetter

Nested classes/interfaces inherited from interface org.apache.calcite.avatica.util.Cursor

Cursor.Accessor

Field Summary

Fields

Modifier and Type	Field and Description
private E	current
private Iterator<E>	iterator
private IteratorCursor.Position	position

Fields inherited from class org.apache.calcite.avatica.util.AbstractCursor

wasNull

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	IteratorCursor(Iterator<E> iterator) Creates an IteratorCursor.

Method Summary

Methods

Modifier and Type	Method and Description
void	close() Closes this cursor and releases resources.
protected E	current() Returns the current row.
boolean	next() Moves to the next row.

Methods inherited from class org.apache.calcite.avatica.util.AbstractCursor

createAccessor, createAccessor, createAccessors, createGetter, intToTime, longToTimestamp, wasNull

Methods inherited from class java.lang.Object

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

Field Detail

position

private IteratorCursor.Position position

iterator

private final Iterator<E> iterator

current

private E current

Constructor Detail

IteratorCursor

protected IteratorCursor(Iterator<E> iterator)

Creates an IteratorCursor.

Parameters:

iterator - input iterator

Method Detail

next

public boolean next()

Description copied from interface: Cursor

Moves to the next row.

Specified by:

next in interface Cursor

Specified by:

next in class AbstractCursor

Returns:

Whether moved

close

public void close()

Description copied from interface: Cursor

Closes this cursor and releases resources.

current

protected E current()

Description copied from class: PositionedCursor

Returns the current row.

Specified by:

current in class PositionedCursor<E>

Returns:

current row