net.walend.enum
Class AbstractEnum

java.lang.Object
  |
  +--net.walend.enum.AbstractEnum

All Implemented Interfaces:

java.util.Collection, Enum, Immutable, java.io.Serializable, java.util.Set

Direct Known Subclasses:

Operations

public abstract class AbstractEnum

extends java.lang.Object

implements Enum, java.io.Serializable

A utility class that implements all of Enum's methods by delegating them to an underlying immutable Set. Concrete subclasses should be singletons. They should override readResolve() to return the singleton value.

Since:

20021230

Author:

David Walend david@walend.net

See Also:

Serialized Form

Field Summary

private java.util.Set

set

Constructor Summary

protected

AbstractEnum(java.util.Set memberSet)

Method Summary

boolean	add(java.lang.Object o) This method always throws an UnsupportedOperationException.
boolean	addAll(java.util.Collection c) This method always throws an UnsupportedOperationException.
void	clear() This method always throws an UnsupportedOperationException.
boolean	contains(java.lang.Object o)
boolean	containsAll(java.util.Collection c)
boolean	equals(java.lang.Object o)
int	hashCode()
boolean	isEmpty()
java.util.Iterator	iterator()
boolean	remove(java.lang.Object o) This method always throws an UnsupportedOperationException.
boolean	removeAll(java.util.Collection c) This method always throws an UnsupportedOperationException.
boolean	retainAll(java.util.Collection c) This method always throws an UnsupportedOperationException.
int	size()
java.lang.Object[]	toArray()
java.lang.Object[]	toArray(java.lang.Object[] a)
java.lang.String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

set

private final java.util.Set set

Constructor Detail

AbstractEnum

protected AbstractEnum(java.util.Set memberSet)

Method Detail

size

public int size()

Specified by:

size in interface java.util.Set

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface java.util.Set

contains

public boolean contains(java.lang.Object o)

Specified by:

contains in interface java.util.Set

iterator

public java.util.Iterator iterator()

Specified by:

iterator in interface java.util.Set

toArray

public java.lang.Object[] toArray()

Specified by:

toArray in interface java.util.Set

toArray

public java.lang.Object[] toArray(java.lang.Object[] a)

Specified by:

toArray in interface java.util.Set

add

public boolean add(java.lang.Object o)

This method always throws an UnsupportedOperationException.

Specified by:

add in interface java.util.Set

Throws:

java.lang.UnsupportedOperationException - because this is an immutable object.

remove

public boolean remove(java.lang.Object o)

This method always throws an UnsupportedOperationException.

Specified by:

remove in interface java.util.Set

Throws:

java.lang.UnsupportedOperationException - because this is an immutable object.

containsAll

public boolean containsAll(java.util.Collection c)

Specified by:

containsAll in interface java.util.Set

addAll

public boolean addAll(java.util.Collection c)

This method always throws an UnsupportedOperationException.

Specified by:

addAll in interface java.util.Set

Throws:

java.lang.UnsupportedOperationException - because this is an immutable object.

retainAll

public boolean retainAll(java.util.Collection c)

This method always throws an UnsupportedOperationException.

Specified by:

retainAll in interface java.util.Set

Throws:

java.lang.UnsupportedOperationException - because this is an immutable object.

removeAll

public boolean removeAll(java.util.Collection c)

This method always throws an UnsupportedOperationException.

Specified by:

removeAll in interface java.util.Set

Throws:

java.lang.UnsupportedOperationException - because this is an immutable object.

clear

public void clear()

This method always throws an UnsupportedOperationException.

Specified by:

clear in interface java.util.Set

Throws:

java.lang.UnsupportedOperationException - because this is an immutable object.

equals

public boolean equals(java.lang.Object o)

Specified by:

equals in interface java.util.Set

Overrides:

equals in class java.lang.Object

hashCode

public int hashCode()

Specified by:

hashCode in interface java.util.Set

Overrides:

hashCode in class java.lang.Object

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object