org.bson.util
Class ClassMap<T>

java.lang.Object
  org.bson.util.ClassMap<T>

public class ClassMap<T>
extends Object

Maps Class objects to values. A ClassMap is different from a regular Map in that get(c) does not only look to see if 'c' is a key in the Map, but also walks the up superclass and interface graph of 'c' to find matches. Derived matches of this sort are then "cached" in the registry so that matches are faster on future gets. This is a very useful class for Class based registries. Example: ClassMap m = new ClassMap(); m.put(Animal.class, "Animal"); m.put(Fox.class, "Fox"); m.Fox.class) --> "Fox" m.get(Dog.class) --> "Animal" (assuming Dog.class < Animal.class)

Constructor Summary

ClassMap()

Method Summary

void	clear()
T	get(Object key)
static <T> List<Class<?>>	getAncestry(Class<T> c) Walks superclass and interface graph, superclasses first, then interfaces, to compute an ancestry list.
boolean	isEmpty()
T	put(Class<?> key, T value)
T	remove(Object key)
int	size()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ClassMap

public ClassMap()

Method Detail

getAncestry

public static <T> List<Class<?>> getAncestry(Class<T> c)

Walks superclass and interface graph, superclasses first, then interfaces, to compute an ancestry list. Supertypes are visited left to right. Duplicates are removed such that no Class will appear in the list before one of its subtypes.

get

public T get(Object key)

put

public T put(Class<?> key,
             T value)

remove

public T remove(Object key)

clear

public void clear()

size

public int size()

isEmpty

public boolean isEmpty()