org.eigenbase.runtime
Class CompoundIterator

java.lang.Object
  org.eigenbase.runtime.CompoundIterator

All Implemented Interfaces:

Iterator, RestartableIterator

public class CompoundIterator
extends Object
implements RestartableIterator

CompoundIterator creates an iterator out of several. CompoundIterator is serial: it yields all the elements of its first input Iterator, then all those of its second input, etc. When all inputs are exhausted, it is done.

NOTE jvs 21-Mar-2006: This class is no longer used except by Saffron, but is generally useful. Should probably be moved to a utility package.

Nested Class Summary

static class

CompoundIterator.Test

Field Summary

private int	i
private Iterator	iterator
private Iterator[]	iterators
private static Logger	tracer

Constructor Summary

CompoundIterator(Iterator[] iterators)

Method Summary

boolean	hasNext()
Object	next()
private boolean	nextIterator()
void	remove()
void	restart() Restarts this iterator, so that a subsequent call to next() returns the first element in the collection being iterated.

Methods inherited from class java.lang.Object

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

Field Detail

tracer

private static final Logger tracer

iterator

private Iterator iterator

iterators

private Iterator[] iterators

i

private int i

Constructor Detail

CompoundIterator

public CompoundIterator(Iterator[] iterators)

Method Detail

hasNext

public boolean hasNext()

Specified by:

hasNext in interface Iterator

next

public Object next()

Specified by:

next in interface Iterator

remove

public void remove()

Specified by:

remove in interface Iterator

nextIterator

private boolean nextIterator()

restart

public void restart()

Description copied from interface: RestartableIterator

Restarts this iterator, so that a subsequent call to next() returns the first element in the collection being iterated.

Specified by:

restart in interface RestartableIterator