Package net.cscott.jutil

Class PersistentEnvironment<K,V>

java.lang.Object

java.util.AbstractMap<K,V>

net.cscott.jutil.PersistentEnvironment<K,V>

All Implemented Interfaces:

Map<K,V>, Environment<K,V>

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

PersistentEnvironment is an Environment built on a PersistentMap.

Author:

C. Scott Ananian <cananian@alumni.princeton.edu>

Nested Class Summary

Nested classes/interfaces inherited from class java.util.AbstractMap

AbstractMap.SimpleEntry<K,V>, AbstractMap.SimpleImmutableEntry<K,V>

Nested classes/interfaces inherited from interface java.util.Map

Map.Entry<K,V>

Constructor Summary

Constructors

Constructor	Description
PersistentEnvironment()	Creates a PersistentEnvironment with no mappings.
PersistentEnvironment(Map<K2,V2> m)	Creates a PersistentEnvironment with the same mappings as the given Map.

Method Summary

Modifier and Type	Method	Description
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<Map.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.

Methods inherited from class java.util.AbstractMap

clone, containsValue, equals, hashCode, keySet, putAll, toString, values

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Map

compute, computeIfAbsent, computeIfPresent, containsValue, equals, forEach, getOrDefault, hashCode, keySet, merge, putAll, putIfAbsent, remove, replace, replace, replaceAll, values

Constructor Details

PersistentEnvironment

public PersistentEnvironment()

Creates a PersistentEnvironment with no mappings.

PersistentEnvironment

public PersistentEnvironment(Map<K2,V2> m)

Creates a PersistentEnvironment with the same mappings as the given Map.

Method Details

clear

public void clear()

Remove all mappings from this map.

Specified by:

clear in interface Map<K,V>

Overrides:

clear in class AbstractMap<K,V>

isEmpty

public boolean isEmpty()

Returns true if this map contains no key-value mappings.

Specified by:

isEmpty in interface Map<K,V>

Overrides:

isEmpty in class AbstractMap<K,V>

size

public int size()

Returns the numer of key-value mappings in this map.

Specified by:

size in interface Map<K,V>

Overrides:

size in class AbstractMap<K,V>

get

public V get(Object key)

Returns the value to which this map maps the specified key.

Specified by:

get in interface Map<K,V>

Overrides:

get in class AbstractMap<K,V>

put

public V put(K key,
 V value)

Associates the specified value with the specified key in this map.

Specified by:

put in interface Map<K,V>

Overrides:

put in class AbstractMap<K,V>

containsKey

public boolean containsKey(Object key)

Returns true if this map contains a mapping for the specified key.

Specified by:

containsKey in interface Map<K,V>

Overrides:

containsKey in class AbstractMap<K,V>

remove

public V remove(Object key)

Removes the mapping for this key from this map if present.

Specified by:

remove in interface Map<K,V>

Overrides:

remove in class AbstractMap<K,V>

getMark

public Environment.Mark getMark()

Get a mark that will allow you to restore the current state of this environment.

Specified by:

getMark in interface Environment<K,V>

undoToMark

public 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.

Specified by:

undoToMark in interface Environment<K,V>

entrySet

public Set<Map.Entry<K,V>> entrySet()

Returns a set view of the mappings contained in this map. The returned set is immutable.

Specified by:

entrySet in interface Map<K,V>

Specified by:

entrySet in class AbstractMap<K,V>