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Jython is an implementation of the high-level, dynamic, object-oriented language Python written in 100% Pure Java, and seamlessly integrated with the Java platform. It thus allows you to run Python on any Java platform.

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package org.python.core;

public class PyCallIter extends PyIterator {
    //note: Already implements Traverseproc, inheriting it from PyIterator

    private PyObject callable;

    private PyObject sentinel;

    public PyCallIter(PyObject callable, PyObject sentinel) {
        if (!callable.isCallable()) {
            throw Py.TypeError("iter(v, w): v must be callable");
        }
        this.callable = callable;
        this.sentinel = sentinel;
    }

    public PyObject __iternext__() {
        if (callable == null) {
            return null;
        }

        PyObject result;
        try {
            result = callable.__call__();
        } catch (PyException exc) {
            if (exc.match(Py.StopIteration)) {
                callable = null;
                stopException = exc;
                return null;
            }
            throw exc;
        }
        if (result._eq(sentinel).__nonzero__()) {
            callable = null;
            return null;
        }
        return result;
    }


    /* Traverseproc implementation */
    @Override
    public int traverse(Visitproc visit, Object arg) {
        int retValue = super.traverse(visit, arg);
        if (retValue != 0) {
            return retValue;
        }
        if (callable != null) {
            retValue = visit.visit(callable, arg);
            if (retValue != 0) {
                return retValue;
            }
        }
        return sentinel != null ? visit.visit(sentinel, arg) : 0;
    }

    @Override
    public boolean refersDirectlyTo(PyObject ob) {
        return ob != null && (ob == callable || ob == sentinel || super.refersDirectlyTo(ob));
    }
}