net.cscott.jutil

Class PersistentEnvironment<K,V>

public class PersistentEnvironment<K,V> extends AbstractMap<K,V> implements Environment<K,V>

PersistentEnvironment is an Environment built on a PersistentMap.

Version: $Id: PersistentEnvironment.java,v 1.2 2004/01/13 21:57:14 cananian Exp $

Author: C. Scott Ananian

Constructor Summary
	PersistentEnvironment() Creates a `PersistentEnvironment` with no mappings.
<K2 extends K,V2 extends V>	PersistentEnvironment(Map<K2,V2> m) Creates a `PersistentEnvironment` with the same mappings as the given `Map`.

Method Summary
void	clear() Remove all mappings from this map.
boolean	containsKey(Object key) Returns `true` if this map contains a mapping for the specified key.
Set<Entry<K,V>>	entrySet() Returns a set view of the mappings contained in this map.
V	get(Object key) Returns the value to which this map maps the specified key.
Environment.Mark	getMark() Get a mark that will allow you to restore the current state of this environment.
boolean	isEmpty() Returns `true` if this map contains no key-value mappings.
V	put(K key, V value) Associates the specified value with the specified key in this map.
V	remove(Object key) Removes the mapping for this key from this map if present.
int	size() Returns the numer of key-value mappings in this map.
void	undoToMark(Environment.Mark m) Undo all changes since the supplied mark, restoring the map to its state at the time the mark was taken.