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Java Source Code / Java Documentation » Library » Apache common Collections » org.apache.commons.collections.map 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   org.apache.commons.collections.map.AbstractMapDecorator
      org.apache.commons.collections.map.LazyMap
         org.apache.commons.collections.map.LazySortedMap

LazySortedMap
public class LazySortedMap extends LazyMap implements SortedMap(Code)
Decorates another SortedMap to create objects in the map on demand.

When the LazySortedMap.get(Object) method is called with a key that does not exist in the map, the factory is used to create the object. The created object will be added to the map using the requested key.

For instance:

 Factory factory = new Factory() {
 public Object create() {
 return new Date();
 }
 }
 SortedMap lazy = Lazy.sortedMap(new HashMap(), factory);
 Object obj = lazy.get("NOW");
 
After the above code is executed, obj will contain a new Date instance. Furthermore, that Date instance is mapped to the "NOW" key in the map.

Note that LazySortedMap is not synchronized and is not thread-safe. If you wish to use this map from multiple threads concurrently, you must use appropriate synchronization. The simplest approach is to wrap this map using java.util.Collections.synchronizedSortedMap . This class may throw exceptions when accessed by concurrent threads without synchronization.

This class is Serializable from Commons Collections 3.1.
since:
   Commons Collections 3.0
version:
   $Revision: 348007 $ $Date: 2005-11-21 22:52:57 +0000 (Mon, 21 Nov 2005) $
author:
   Stephen Colebourne
author:
   Paul Jack




Constructor Summary
protected  LazySortedMap(SortedMap map, Factory factory)
     Constructor that wraps (not copies).
protected  LazySortedMap(SortedMap map, Transformer factory)
     Constructor that wraps (not copies).

Method Summary
public  Comparatorcomparator()
    
public static  SortedMapdecorate(SortedMap map, Factory factory)
     Factory method to create a lazily instantiated sorted map.
public static  SortedMapdecorate(SortedMap map, Transformer factory)
     Factory method to create a lazily instantiated sorted map.
public  ObjectfirstKey()
    
protected  SortedMapgetSortedMap()
     Gets the map being decorated.
public  SortedMapheadMap(Object toKey)
    
public  ObjectlastKey()
    
public  SortedMapsubMap(Object fromKey, Object toKey)
    
public  SortedMaptailMap(Object fromKey)
    


Constructor Detail
LazySortedMap
protected LazySortedMap(SortedMap map, Factory factory)(Code)
Constructor that wraps (not copies).
Parameters:
  map - the map to decorate, must not be null
Parameters:
  factory - the factory to use, must not be null
throws:
  IllegalArgumentException - if map or factory is null



LazySortedMap
protected LazySortedMap(SortedMap map, Transformer factory)(Code)
Constructor that wraps (not copies).
Parameters:
  map - the map to decorate, must not be null
Parameters:
  factory - the factory to use, must not be null
throws:
  IllegalArgumentException - if map or factory is null




Method Detail
comparator
public Comparator comparator()(Code)



decorate
public static SortedMap decorate(SortedMap map, Factory factory)(Code)
Factory method to create a lazily instantiated sorted map.
Parameters:
  map - the map to decorate, must not be null
Parameters:
  factory - the factory to use, must not be null
throws:
  IllegalArgumentException - if map or factory is null



decorate
public static SortedMap decorate(SortedMap map, Transformer factory)(Code)
Factory method to create a lazily instantiated sorted map.
Parameters:
  map - the map to decorate, must not be null
Parameters:
  factory - the factory to use, must not be null
throws:
  IllegalArgumentException - if map or factory is null



firstKey
public Object firstKey()(Code)



getSortedMap
protected SortedMap getSortedMap()(Code)
Gets the map being decorated. the decorated map



headMap
public SortedMap headMap(Object toKey)(Code)



lastKey
public Object lastKey()(Code)



subMap
public SortedMap subMap(Object fromKey, Object toKey)(Code)



tailMap
public SortedMap tailMap(Object fromKey)(Code)



Fields inherited from org.apache.commons.collections.map.LazyMap
final protected Transformer factory(Code)(Java Doc)

Methods inherited from org.apache.commons.collections.map.LazyMap
public static Map decorate(Map map, Factory factory)(Code)(Java Doc)
public static Map decorate(Map map, Transformer factory)(Code)(Java Doc)
public Object get(Object key)(Code)(Java Doc)

Fields inherited from org.apache.commons.collections.map.AbstractMapDecorator
protected transient Map map(Code)(Java Doc)

Methods inherited from org.apache.commons.collections.map.AbstractMapDecorator
public void clear()(Code)(Java Doc)
public boolean containsKey(Object key)(Code)(Java Doc)
public boolean containsValue(Object value)(Code)(Java Doc)
public Set entrySet()(Code)(Java Doc)
public boolean equals(Object object)(Code)(Java Doc)
public Object get(Object key)(Code)(Java Doc)
protected Map getMap()(Code)(Java Doc)
public int hashCode()(Code)(Java Doc)
public boolean isEmpty()(Code)(Java Doc)
public Set keySet()(Code)(Java Doc)
public Object put(Object key, Object value)(Code)(Java Doc)
public void putAll(Map mapToCopy)(Code)(Java Doc)
public Object remove(Object key)(Code)(Java Doc)
public int size()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
public Collection values()(Code)(Java Doc)

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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