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Java Source Code / Java Documentation » Science » javolution 5.2 » javolution.util 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   javolution.util.LocalMap

LocalMap
final public class LocalMap implements Map(Code)

This class represents a map which can be temporarily modified without impacting other threads ( LocalContext locally scoped changes).

Operation on instances of this class are completely thread-safe. For example: public class XMLFormat { static LocalMap CLASS_TO_FORMAT = new LocalMap(); public static void setFormat(Class forClass, XMLFormat that) { CLASS_TO_FORMAT.put(forClass, that); // No synchronization required. } public static XMLFormat getInstance(Class forClass) { return CLASS_TO_FORMAT.get(forClass); // No synchronization required. } } public void main(String[] args) { // Sets default (global settings). XMLFormat.setFormat(Foo.class, xFormat); XMLFormat.setFormat(Bar.class, yFormat); } ... // Another thread. LocalContext.enter(); try { // Use of local context to avoid impacting other threads. XMLFormat.setFormat(Foo.class, zFormat); XMLFormat.getInstance(Foo.class); // Returns zFormat XMLFormat.getInstance(Bar.class); // Returns yFormat (inherited) } finally { LocalContext.exit(); } getInstance(Foo.class); // Returns xFormat [/code]

Note: Because key-value mappings are inherited, the semantic of LocalMap.remove and LocalMap.clear is slightly modified (associate null values instead of removing the entries).


author:
   Jean-Marie Dautelle
version:
   3.7, January 27, 2005



Constructor Summary
public  LocalMap()
     Default constructor.

Method Summary
public  voidclear()
     Removes all mappings from this map (sets the local values to null).
public  booleancontainsKey(Object key)
     Indicates if this map contains a mapping for the specified key.
Parameters:
  key - the key whose presence in this map is to be tested.
public  booleancontainsValue(Object value)
     Indicates if this map associates one or more keys to the specified value.
Parameters:
  value - the value whose presence in this map is to be tested.
public  SetentrySet()
     Returns a FastCollection view of the mappings contained in this map.
public  Objectget(Object key)
     Returns the value to which this map associates the specified key.
Parameters:
  key - the key whose associated value is to be returned.
public  booleanisEmpty()
     Indicates if this map contains no key-value mappings.
public  SetkeySet()
     Returns a FastCollection view of the keys contained in this map.
public  Objectput(Object key, Object value)
     Associates the specified value with the specified key in this map.
Parameters:
  key - the key with which the specified value is to be associated.
Parameters:
  value - the value to be associated with the specified key.
public  voidputAll(Map map)
     Copies all of the mappings from the specified map to this map.
public  ObjectputDefault(Object key, Object defaultValue)
     Sets the default value for the specified key (typically done at initialization).
public  Objectremove(Object key)
     Removes the mapping for this key from this map if present (sets the local value to null).
public  LocalMapsetKeyComparator(FastComparator keyComparator)
     Sets the key comparator for this local map.
Parameters:
  keyComparator - the key comparator.
public  LocalMapsetValueComparator(FastComparator valueComparator)
     Sets the value comparator for this local map.
Parameters:
  valueComparator - the value comparator.
public  intsize()
     Returns the number of key-value mappings in this map.
public  Collectionvalues()
     Returns a FastCollection view of the values contained in this map.


Constructor Detail
LocalMap
public LocalMap()(Code)
Default constructor.




Method Detail
clear
public void clear()(Code)
Removes all mappings from this map (sets the local values to null).



containsKey
public boolean containsKey(Object key)(Code)
Indicates if this map contains a mapping for the specified key.
Parameters:
  key - the key whose presence in this map is to be tested. true if this map contains a mapping for thespecified key; false otherwise.
throws:
  NullPointerException - if the key is null.



containsValue
public boolean containsValue(Object value)(Code)
Indicates if this map associates one or more keys to the specified value.
Parameters:
  value - the value whose presence in this map is to be tested. true if this map maps one or more keys to thespecified value.
throws:
  NullPointerException - if the key is null.



entrySet
public Set entrySet()(Code)
Returns a FastCollection view of the mappings contained in this map. a collection view of the mappings contained in this map(instance of FastCollection).



get
public Object get(Object key)(Code)
Returns the value to which this map associates the specified key.
Parameters:
  key - the key whose associated value is to be returned. the value to which this map maps the specified key, ornull if there is no mapping for the key.
throws:
  NullPointerException - if key is null.



isEmpty
public boolean isEmpty()(Code)
Indicates if this map contains no key-value mappings. true if this map contains no key-value mappings;false otherwise.



keySet
public Set keySet()(Code)
Returns a FastCollection view of the keys contained in this map. a set view of the keys contained in this map(instance of FastCollection).



put
public Object put(Object key, Object value)(Code)
Associates the specified value with the specified key in this map.
Parameters:
  key - the key with which the specified value is to be associated.
Parameters:
  value - the value to be associated with the specified key. the previous value associated with specified key, ornull if there was no mapping for key. Anull return can also indicate that the mappreviously associated null with the specified key.
throws:
  NullPointerException - if the key is null.



putAll
public void putAll(Map map)(Code)
Copies all of the mappings from the specified map to this map.
Parameters:
  map - the mappings to be stored in this map.
throws:
  NullPointerException - the specified map is null,or the specified map contains null keys.



putDefault
public Object putDefault(Object key, Object defaultValue)(Code)
Sets the default value for the specified key (typically done at initialization).
Parameters:
  key - the key with which the specified value is to be associated.
Parameters:
  defaultValue - the default value to be associated with the specified key. the previous default value associated with specified key, ornull if there was no mapping for key. Anull return can also indicate that the mappreviously associated null with the specified key.
throws:
  NullPointerException - if the key is null.



remove
public Object remove(Object key)(Code)
Removes the mapping for this key from this map if present (sets the local value to null).
Parameters:
  key - the key whose value is set to null put(key, null)
throws:
  NullPointerException - if the key is null.



setKeyComparator
public LocalMap setKeyComparator(FastComparator keyComparator)(Code)
Sets the key comparator for this local map.
Parameters:
  keyComparator - the key comparator. this



setValueComparator
public LocalMap setValueComparator(FastComparator valueComparator)(Code)
Sets the value comparator for this local map.
Parameters:
  valueComparator - the value comparator. this



size
public int size()(Code)
Returns the number of key-value mappings in this map. this map's size.



values
public Collection values()(Code)
Returns a FastCollection view of the values contained in this map. a collection view of the values contained in this map (instance of FastCollection).



Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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