com.google.cloud.dataflow.sdk.util.common

Class ForwardingReiterator<T>

java.lang.Object

com.google.cloud.dataflow.sdk.util.common.ForwardingReiterator<T>

Type Parameters:

T - the type of elements returned by this iterator

All Implemented Interfaces:

Reiterator<T>, Cloneable, Iterator<T>

Direct Known Subclasses:

ProgressTrackingReiterator

public abstract class ForwardingReiterator<T>
extends Object
implements Reiterator<T>, Cloneable

A Reiterator that forwards to another Reiterator, useful for implementing Reiterator wrappers.

Constructor Summary

Constructors

Constructor and Description
ForwardingReiterator(Reiterator<T> base) Constructs a ForwardingReiterator.

Method Summary

Modifier and Type	Method and Description
protected ForwardingReiterator<T>	clone()
ForwardingReiterator<T>	copy() Returns a copy of the current Reiterator.
boolean	hasNext()
T	next()
void	remove()

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Iterator

forEachRemaining

Constructor Detail

ForwardingReiterator

public ForwardingReiterator(Reiterator<T> base)

Constructs a ForwardingReiterator.

Parameters:

base - supplies a base reiterator to forward requests to. This reiterator will be used directly; it will not be copied by the constructor.

Method Detail

clone

protected ForwardingReiterator<T> clone()

Overrides:

clone in class Object

hasNext

public boolean hasNext()

Specified by:

hasNext in interface Iterator<T>

next

public T next()

Specified by:

next in interface Iterator<T>

remove

public void remove()

Specified by:

remove in interface Iterator<T>

copy

public ForwardingReiterator<T> copy()

Returns a copy of the current Reiterator. The copy's iteration state is logically independent of the current iterator; each may be advanced without affecting the other.

The returned Reiterator is not guaranteed to return referentially identical iteration results as the original Reiterator, although Object.equals(java.lang.Object) will typically return true for the corresponding elements of each if the original source is logically immutable.

This implementation uses clone() to construct a duplicate of the Reiterator. Derived classes must either implement Cloneable semantics, or must provide an alternative implementation of this method.

Specified by:

copy in interface Reiterator<T>