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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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/* Copyright (c) Jython Developers */
package org.python.modules._jythonlib;

import org.python.core.Py;
import org.python.core.PyObject;
import org.python.core.PySet;
import org.python.core.PySetDerived;
import org.python.core.PyType;

import java.util.Set;


/* Support building PySet objects with arbitrary backing Set objects
 * Uses a factory for efficiency.
 *
 * See the very similar dict_builder for more insight. But note that we do not
 * impose the restriction that the set be concurrent, although this is generally
 * what we would want.
 */

public class set_builder extends PyObject {

    public static final PyType TYPE = PyType.fromClass(set_builder.class);
    private final PyObject factory;
    private final PyType set_type;

    public set_builder(PyObject factory) {
        super();
        this.factory = factory;
        this.set_type = null;
    }

    public set_builder(PyObject factory, PyType set_type) {
        super();
        this.factory = factory;
        this.set_type = set_type;
    }

    public PyObject __call__(PyObject iterable) {
        Set backing_set = (Set) (factory.__call__().__tojava__(Set.class));
        if (set_type == null) {
            return new PySet(backing_set, iterable == Py.None ? null : iterable);
        } else {
            return new PySetDerived(set_type, backing_set, iterable == Py.None ? null : iterable);
        }
    }

}