java.lang.Object | |||
↳ | org.apache.commons.collections.map.AbstractMapDecorator | ||
↳ | org.apache.commons.collections.map.LazyMap | ||
↳ | org.apache.commons.collections.map.LazySortedMap |
Decorates another SortedMap
to create objects in the map on demand.
When the 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 synchronizedSortedMap(SortedMap
. This class may throw
exceptions when accessed by concurrent threads without synchronization.
This class is Serializable from Commons Collections 3.1.
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Inherited Fields | |||||||||||
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From class
org.apache.commons.collections.map.LazyMap
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From class
org.apache.commons.collections.map.AbstractMapDecorator
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Protected Constructors | |||||||||||
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Constructor that wraps (not copies).
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Constructor that wraps (not copies).
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Public Methods | |||||||||||
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Factory method to create a lazily instantiated sorted map.
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Factory method to create a lazily instantiated sorted map.
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Protected Methods | |||||||||||
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Gets the map being decorated.
|
[Expand]
Inherited Methods | |||||||||||
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From class
org.apache.commons.collections.map.LazyMap
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From class
org.apache.commons.collections.map.AbstractMapDecorator
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From class
java.lang.Object
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From interface
java.util.Map
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From interface
java.util.SortedMap
|
Constructor that wraps (not copies).
map | the map to decorate, must not be null |
---|---|
factory | the factory to use, must not be null |
IllegalArgumentException | if map or factory is null |
---|
Constructor that wraps (not copies).
map | the map to decorate, must not be null |
---|---|
factory | the factory to use, must not be null |
IllegalArgumentException | if map or factory is null |
---|
Factory method to create a lazily instantiated sorted map.
map | the map to decorate, must not be null |
---|---|
factory | the factory to use, must not be null |
IllegalArgumentException | if map or factory is null |
---|
Factory method to create a lazily instantiated sorted map.
map | the map to decorate, must not be null |
---|---|
factory | the factory to use, must not be null |
IllegalArgumentException | if map or factory is null |
---|