Artifact 18f647d617bbc8b823685932be0ea3f2e2dbc65cc15cc10ff694eb663e243f2b:

• Executable file r37/lisp/csl/jlisp/UserJava.java — part of check-in [f2fda60abd] at 2011-09-02 18:13:33 on branch master — Some historical releases purely for archival purposes

  git-svn-id: https://svn.code.sf.net/p/reduce-algebra/code/trunk/historical@1375 2bfe0521-f11c-4a00-b80e-6202646ff360 (user: arthurcnorman@users.sourceforge.net, size: 1178) [annotate] [blame] [check-ins using] [more...]

// This is to demonstrate how user Java code can be called from Jlisp.
// You may edit this file to put in arbitrary Java definitions in the
// various methods (which had better be public static and named as shown 
// here). 
//
// From within Jlisp (and hence REDUCE) the function USERJAVA will then
// call the method from here that corresponds to the relevant number of
// arguments. This class MUST be called "UserJava" but it is loaded
// dynamically when Jlisp is running and when the first use of it is
// attempted. So the class file must be somewhere that the default Java
// classloader will look. But this file does NOT need to be present when
// Jlisp is built.
//

public class UserJava
{
    public static LispObject op0()
    {
        return new LispString("Sample");
    }

    public static LispObject op1(LispObject a)
    {
        return new Cons(a, a);
    }

    public static LispObject op2(LispObject a, LispObject b)
    {
        return new Cons(b, a);
    }

    public static LispObject opn(LispObject [] a)
    {
        LispObject r = Jlisp.nil;
        for (int i=0; i<a.length; i++)
            r = new Cons(a[i], r);
        return r;
    }
}