org.osgl.inject

Interface KeyExtractor<K,V>

Type Parameters:

K - generic type of the key

V - generic type of the value

All Known Implementing Classes:

KeyExtractor.PropertyExtractor

public interface KeyExtractor<K,V>

A KeyExtractor can be used to extract or derive “key” from a value data. The result “key” can be used to index the value in a Map data structure.

A general contract implementation must obey is different value must generate different key

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static class	KeyExtractor.PropertyExtractor An implementation of KeyExtractor that extract property (specified through hint parameter) from a java bean (data).

Method Summary

Modifier and Type	Method and Description
K	keyOf(java.lang.String hint, V data) Get the key of data.

Method Detail

keyOf

K keyOf(java.lang.String hint,
        V data)

Get the key of data.

Parameters:

hint - optional, a string value provides hint to extract key

data - the value data

Returns:

the key of the data