org.yop.reflection

Class ReflectionCache

java.lang.Object

org.yop.reflection.ReflectionCache

class ReflectionCache
extends Object

A static cache for anything related to Reflection.
java.lang.reflect methods can take a bit of time. Let's try to use some cache !

Field Summary

Fields

Modifier and Type	Field and Description
private static org.apache.commons.collections4.MultiValuedMap<Class,Field>	DECLARED_FIELDS Declared fields for a given class
private static Map<Class<?>,Class<?>>	KNOWN_IMPLEMENTATIONS Reference implementations for common interfaces

Constructor Summary

Constructors

Constructor and Description
ReflectionCache()

Method Summary

Modifier and Type	Method and Description
(package private) static Collection<Field>	getDeclaredFields(Class clazz)
(package private) static <T> Class<? extends T>	implementationOf(Class<T> clazz) Returns the first known implementation of a class.

Methods inherited from class java.lang.Object

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

Field Detail

DECLARED_FIELDS

private static final org.apache.commons.collections4.MultiValuedMap<Class,Field> DECLARED_FIELDS

Declared fields for a given class

KNOWN_IMPLEMENTATIONS

private static final Map<Class<?>,Class<?>> KNOWN_IMPLEMENTATIONS

Reference implementations for common interfaces

Constructor Detail

ReflectionCache

ReflectionCache()

Method Detail

getDeclaredFields

static Collection<Field> getDeclaredFields(Class clazz)

implementationOf

static <T> Class<? extends T> implementationOf(Class<T> clazz)

Returns the first known implementation of a class.
It can be itself if the class Reflection.isConcrete(Class).
Several strategies :

• concrete → return the class itself
• KNOWN_IMPLEMENTATIONS has a reference implementation → go for it
• else → use Reflections to find all the subtypes in the whole context.
  Take the first concrete sub type, add it to the KNOWN_IMPLEMENTATIONS and return !

Type Parameters:

T - the class generic type

Parameters:

clazz - the class whose implementation is sought

Returns:

the first implementation found, self if concrete, null if no known implementation