public class LazySortedMap extends LazyMap implements SortedMap
SortedMap to create objects in the map on demand.
When the LazyMap.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 Collections.synchronizedSortedMap(java.util.SortedMap). This class may throw
exceptions when accessed by concurrent threads without synchronization.
This class is Serializable from Commons Collections 3.1.
map| Modifier | Constructor and Description |
|---|---|
protected |
LazySortedMap(SortedMap map,
Factory factory)
Constructor that wraps (not copies).
|
protected |
LazySortedMap(SortedMap map,
Transformer factory)
Constructor that wraps (not copies).
|
| Modifier and Type | Method and Description |
|---|---|
Comparator |
comparator() |
static SortedMap |
decorate(SortedMap map,
Factory factory)
Factory method to create a lazily instantiated sorted map.
|
static SortedMap |
decorate(SortedMap map,
Transformer factory)
Factory method to create a lazily instantiated sorted map.
|
Object |
firstKey() |
protected SortedMap |
getSortedMap()
Gets the map being decorated.
|
SortedMap |
headMap(Object toKey) |
Object |
lastKey() |
SortedMap |
subMap(Object fromKey,
Object toKey) |
SortedMap |
tailMap(Object fromKey) |
clear, containsKey, containsValue, entrySet, equals, getMap, hashCode, isEmpty, keySet, put, putAll, remove, size, toString, valuesprotected LazySortedMap(SortedMap map, Factory factory)
map - the map to decorate, must not be nullfactory - the factory to use, must not be nullIllegalArgumentException - if map or factory is nullprotected LazySortedMap(SortedMap map, Transformer factory)
map - the map to decorate, must not be nullfactory - the factory to use, must not be nullIllegalArgumentException - if map or factory is nullpublic static SortedMap decorate(SortedMap map, Factory factory)
map - the map to decorate, must not be nullfactory - the factory to use, must not be nullIllegalArgumentException - if map or factory is nullpublic static SortedMap decorate(SortedMap map, Transformer factory)
map - the map to decorate, must not be nullfactory - the factory to use, must not be nullIllegalArgumentException - if map or factory is nullprotected SortedMap getSortedMap()
public Comparator comparator()
comparator in interface SortedMapCopyright © 2001–2015 The Apache Software Foundation. All rights reserved.