Friday, January 7, 2011

is it possible to instantiate an object from its class type on demand ?

with GWT.create(Foo.class),
it is possible to instantiate Foo object from Foo.class.

however GWT.create mandates the argument passed to create method to be
a class literal, known at compile time.

in cases where the argument is not a class literal, for example coming
from a map,
is there an alternative way to create object Foo from its Foo.class ?

for example, lets say we have a map populated like below:

// this map is populated
Map<ObjectA, Class<? extends Foo>> map;

Foo lookupFoo(ObjectA objectA) {

Class<? extends Foo> fooClazz = map.get(objectA);

return GWT.create(fooClazz);

}

this works in hosted mode, but doesnt compile.

is there any alternative way that this can be achieved without early
eagerly instantiation Foo objects ?

the good thing about GWT.create is that it creates the object on
demand. (i believe ?)

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