LazyModel

A type-safe model implementation for Apache Wicket, supporting:

• lazy evaluation of method invocations
• arbitrary parameters
• generics
• collections
• interfaces

    A a = ...;
    
    IModel<B> model = model(from(a).getB());

... or starting from a model:

    IModel<A> a = ...;
    
    IModel<List<String>> model = model(from(a).getB().getStrings());

... or as a LoadableDetachableModel:

    IModel<A> a = ...;
    
    IModel<String> model = model(from(a).getB().getStrings().get("key")).loadableDetachable();

Evaluations can be nested too:

    IModel<A> a = ...;
    IModel<D> d = ...;
    
    IModel<C> model = model(from(a1).getB().getCs().get( from(d).getIndex() ));

DataTables columns can be lazily evaluated too:

    column = new LazyColumn<A, B>(header, from(A.class).getB());

LazyModel has to proxy all evaluation results, thus if you're concerned about performance you might want to cache lazy evaluations:

    private static final LazyModel<B> B = model(from(A.class).getB());

    IModel<A> a = ...;

    add(new TextField<B>("b", B.bind(a));

Inspired by:

• https://cwiki.apache.org/WICKET/working-with-wicket-models.html#WorkingwithWicketmodels-LambdaJ
• https://github.com/duesenklipper/wicket-safemodel
• http://wicketeer.org/wicket-modelfactory

Using:

• http://cglib.sourceforge.net
• http://code.google.com/p/objenesis