polyglot.util
Class TypedListIterator

java.lang.Object
  polyglot.util.TypedListIterator

All Implemented Interfaces:

java.util.Iterator, java.util.ListIterator

public class TypedListIterator
extends java.lang.Object
implements java.util.ListIterator

A TypedListIterator is an ListIterator which will not allow members not belonging to a given type to be added to a collection. Optionally, it may also present an immutable view. If an attempt is made to change an immutable listiterator, or if an attempt is made to insert an improperly-typed element, an UnsupportedOperationException is thrown. This class is given so that we can present a ListIterator for a given given class without worrying about outsiders breaking the rep. This is a poor substitute for PolyJ.

Constructor Summary

TypedListIterator(java.util.ListIterator iter, java.lang.Class c, boolean immutable)
Requires: not null Creates a new TypedIterator around which restricts all members to belong to class .

Method Summary

void	add(java.lang.Object o)
java.lang.Class	getAllowedType() Gets the allowed type for this ListIterator.
boolean	hasNext()
boolean	hasPrevious()
java.lang.Object	next()
int	nextIndex()
java.lang.Object	previous()
int	previousIndex()
void	remove()
void	set(java.lang.Object o)

Methods inherited from class java.lang.Object

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

Constructor Detail

TypedListIterator

public TypedListIterator(java.util.ListIterator iter,
                         java.lang.Class c,
                         boolean immutable)

Requires: not null Creates a new TypedIterator around which restricts all members to belong to class . If is null, no typing restriction is made. If is true, no modifications are allowed.

Method Detail

getAllowedType

public java.lang.Class getAllowedType()

Gets the allowed type for this ListIterator.

add

public void add(java.lang.Object o)

Specified by:

add in interface java.util.ListIterator

set

public void set(java.lang.Object o)

Specified by:

set in interface java.util.ListIterator

hasNext

public boolean hasNext()

Specified by:

hasNext in interface java.util.Iterator

Specified by:

hasNext in interface java.util.ListIterator

hasPrevious

public boolean hasPrevious()

Specified by:

hasPrevious in interface java.util.ListIterator

next

public java.lang.Object next()

Specified by:

next in interface java.util.Iterator

Specified by:

next in interface java.util.ListIterator

nextIndex

public int nextIndex()

Specified by:

nextIndex in interface java.util.ListIterator

previous

public java.lang.Object previous()

Specified by:

previous in interface java.util.ListIterator

previousIndex

public int previousIndex()

Specified by:

previousIndex in interface java.util.ListIterator

remove

public void remove()

Specified by:

remove in interface java.util.Iterator

Specified by:

remove in interface java.util.ListIterator