votorola.g.hold

Class Spool0

java.lang.Object

java.util.AbstractCollection<Hold>

Spool0

All Implemented Interfaces:

Iterable<Hold>, Collection<Hold>, Spool

@ThreadSafe
public final class Spool0
extends AbstractCollection<Hold>
implements Spool

A null implementation of a spool. It is always empty and never unwinds.

Field Summary

Fields inherited from interface Spool

CATCHER_0

Method Summary

Methods

Modifier and Type	Method and Description
boolean	add(Hold hold) Does nothing and returns true.
static Spool0	i() The single instance of Spool0.
boolean	isUnwinding() Returns false.
Iterator<Hold>	iterator()
int	size() Returns zero.
boolean	unwind() Does nothing and returns false.
boolean	unwind(Catcher<Hold> catcher) Does nothing and returns false.

Methods inherited from class java.util.AbstractCollection

addAll, clear, contains, containsAll, isEmpty, remove, removeAll, retainAll, toArray, toArray, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Collection

equals, hashCode

Method Detail

i

public static Spool0 i()

The single instance of Spool0.

iterator

public Iterator<Hold> iterator()

Specified by:

iterator in interface Iterable<Hold>

Specified by:

iterator in interface Collection<Hold>

Specified by:

iterator in class AbstractCollection<Hold>

size

public int size()

Returns zero.

Specified by:

size in interface Collection<Hold>

Specified by:

size in class AbstractCollection<Hold>

add

public boolean add(Hold hold)

Does nothing and returns true.

Specified by:

add in interface Collection<Hold>

Specified by:

add in interface Spool

Overrides:

add in class AbstractCollection<Hold>

Returns:

true if the hold is added; false if it is released instead.

isUnwinding

public boolean isUnwinding()

Returns false.

Specified by:

isUnwinding in interface Spool

unwind

public boolean unwind()

Does nothing and returns false.

Specified by:

unwind in interface Spool

Returns:

true if unwinding commences with this call; false if it had already commenced.

unwind

public boolean unwind(Catcher<Hold> catcher)

Does nothing and returns false.

Specified by:

unwind in interface Spool

Parameters:

catcher - the catcher for any errors or exceptions that occur during unwinding.

Returns:

true if unwinding commences with this call; false if it had already commenced.