polyglot.util

Class TransformingIterator<T,U>

java.lang.Object

polyglot.util.TransformingIterator<T,U>

All Implemented Interfaces:

java.util.Iterator<U>

public final class TransformingIterator<T,U>
extends java.lang.Object
implements java.util.Iterator<U>

TransformingIterator Overview: This is a swiss-army-knife of iterators. It concatenates, maps, and filters. Does not support Remove.

Field Summary

Fields

Modifier and Type	Field and Description
protected java.util.Iterator<T>[]	backing_iterators
protected java.util.Iterator<T>	current_iter
protected int	index
protected U	next_item
protected Transformation<T,U>	transformation

Constructor Summary

Constructors

Constructor and Description
TransformingIterator(java.util.Collection<java.util.Iterator<T>> iters, Transformation<T,U> trans)
TransformingIterator(java.util.Iterator<T>[] iters, Transformation<T,U> trans)
TransformingIterator(java.util.Iterator<T> iter, Transformation<T,U> trans)

Method Summary

Methods

Modifier and Type	Method and Description
boolean	hasNext()
U	next()
void	remove()

Methods inherited from class java.lang.Object

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

Field Detail

next_item

protected U next_item

current_iter

protected java.util.Iterator<T> current_iter

index

protected int index

backing_iterators

protected java.util.Iterator<T>[] backing_iterators

transformation

protected Transformation<T,U> transformation

Constructor Detail

TransformingIterator

public TransformingIterator(java.util.Iterator<T> iter,
                    Transformation<T,U> trans)

TransformingIterator

public TransformingIterator(java.util.Collection<java.util.Iterator<T>> iters,
                    Transformation<T,U> trans)

TransformingIterator

public TransformingIterator(java.util.Iterator<T>[] iters,
                    Transformation<T,U> trans)

Method Detail

next

public U next()

Specified by:

next in interface java.util.Iterator<U>

hasNext

public boolean hasNext()

Specified by:

hasNext in interface java.util.Iterator<U>

remove

public void remove()

Specified by:

remove in interface java.util.Iterator<U>