dynamic object identification problem


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Thread: dynamic object identification problem

  1. #1
    Join Date
    Dec 2005
    Posts
    5

    dynamic object identification problem

    ok, I have a class that takes 3 inputs.
    Variable(NAME, TYPE, DATA);
    the name is a string, the type is a string, however the DATA is where it gets tricky.

    DATA depends on what the string TYPE is. Example
    if TYPE is a String
    DATA isa String
    if TYPE is a VectorObject
    DATA isa VectorObject

    you get the idea right?
    Now, here's the problem. I don't know what to identify DATA as. It's type is determined at runtime, not compiletime, so I don't know what to define it as, since a string cannot be coverted into VectorObject, plus i can't keep redefining DATA.


    Example:
    if TYPE isa VectorObject
    DATA isa VectorObject
    would be shown as VectorObject DATA = new VectorObject();
    the problem arises when i try to store or return the DATA object!

    public <omg i dont know what identifier goes here, b/c i don't know the type yet> GetData { return DATA;}
    So any ideas?
    There's got to be a better way to do this or something small that im missing.
    I'm not sure if i could use an interface for this situation, any suggestions?
    This is for a Java game scripting system im developing.

  2. #2
    Join Date
    Dec 2004
    Location
    San Bernardino County, California
    Posts
    1,468

    Arrow

    Read up on Java's implementation of Generics. It fits the bill you want to implement.

    Variable(String name, T type, T data)
    {...}


    public <T> T getData()
    {
    return DATA;
    }

    Here's a link to the "official" Generics tutorial, in pdf format:

    http://java.sun.com/j2se/1.5/pdf/generics-tutorial.pdf

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