com.rits.perspectives

Class Perspectives

java.lang.Object

com.rits.perspectives.Perspectives

public class Perspectives
extends Object

Perspectives: an object instance of a class behaving differently according to the "view angle".

Author:

kostantinos.kougios 30 Nov 2009

Constructor Summary

Constructors

Constructor and Description
Perspectives(Cloner cloner)

Method Summary

Modifier and Type	Method and Description
<T,E extends T> E	viewAs(Class<E> c, T o) Sample: if o is an instance of Product and c is OrderedProduct.class then this returns and instance of OrderedProduct.class which has equal field values to those of the instance of Product.
<I,NI extends I,T extends Collection<I>,E extends Collection<NI>> E	viewCollectionAs(E newCollection, Class<NI> perspectiveCollectionItemClass, T currentCollection) Sample: if o is a [ Products extends LinkedList ] then the returned instance is a [ OrderedProducts extends LinkedList ].

Methods inherited from class java.lang.Object

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

Constructor Detail

Perspectives

public Perspectives(Cloner cloner)

Method Detail

viewAs

public <T,E extends T> E viewAs(Class<E> c,
                                T o)

Sample: if o is an instance of Product and c is OrderedProduct.class then this returns and instance of OrderedProduct.class which has equal field values to those of the instance of Product. In other words, the returned instance of OrderedProduct.class is the Product instance from the perspective of an OrderedProduct View an object o from the perspective of class c. (view o as an instance of c). c must be instanceof o.getClass()

Type Parameters:

T - the object

E - this will be the returned type and it must be instanceof T. All properties of o will be copied to this instance.

Parameters:

c - the class of E. This is used to generate new instances of c

o - the object that must be viewed from a different perspective

Returns:

the E perspective of o

viewCollectionAs

public <I,NI extends I,T extends Collection<I>,E extends Collection<NI>> E viewCollectionAs(E newCollection,
                                                                                            Class<NI> perspectiveCollectionItemClass,
                                                                                            T currentCollection)

Sample: if o is a [ Products extends LinkedList ] then the returned instance is a [ OrderedProducts extends LinkedList ]. View a collection o from the perspective of collection E. NOTE: order of the items might not be preserved, depending on the collection type

Type Parameters:

T - the type of the collection o

I - the type of the elements of the collection o

E - the type of the perspective collection

NI - the type of the perspective's elements

Parameters:

newCollection - the collection to which the adapted instances should be added

currentCollection - the collection with the instances to be adapted

perspectiveCollectionItemClass - the class of the NI

Returns:

E, the collection from a different perspective or null if currentCollection is null