de.lmu.ifi.dbs.elki.utilities

Class HandlerList<H>

java.lang.Object

de.lmu.ifi.dbs.elki.utilities.HandlerList<H>

Type Parameters:

H - Parent class/interface for all handlers

public final class HandlerList<H>
extends Object

Manages a list of handlers for objects. Handlers are appended to a list in sequence, and when querying, the last added handler will be used where the query object can be cast to the handlers restriction class.

Field Summary

Fields

Modifier and Type	Field and Description
private ArrayList<Pair<Class<?>,H>>	handlers List with registered Handlers.

Constructor Summary

Constructors

Constructor and Description
HandlerList()

Method Summary

Methods

Modifier and Type	Method and Description
H	getHandler(Object o) Find a matching handler for the given object
void	insertHandler(Class<?> restrictionClass, H handler) Insert a handler to the beginning of the stack.

Methods inherited from class java.lang.Object

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

Field Detail

handlers

private ArrayList<Pair<Class<?>,H>> handlers

List with registered Handlers. The list is kept in backwards order, that is the later entrys take precedence.

Constructor Detail

HandlerList

public HandlerList()

Method Detail

insertHandler

public void insertHandler(Class<?> restrictionClass,
                 H handler)

Insert a handler to the beginning of the stack.

Parameters:

restrictionClass - restriction class

handler - handler

getHandler

public H getHandler(Object o)

Find a matching handler for the given object

Parameters:

o - object to find handler for

Returns:

handler for the object. null if no handler was found.