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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 2004-2005 Samuele Pedroni
define: (CompilationUnit)derived_class
  /* Generated file, do not modify.  See jython/src/templates/gderived.py. */
  package org.python.core;

  import java.io.Serializable;
  import org.python.core.finalization.FinalizeTrigger;
  import org.python.core.finalization.FinalizablePyObjectDerived;

  public class `concat`(`base,Derived) extends `base implements Slotted, FinalizablePyObjectDerived, TraverseprocDerived {

    public PyObject getSlot(int index) {
        return slots[index];
    }

    public void setSlot(int index, PyObject value) {
        slots[index] = value;
    }

    private PyObject[] slots;

    public void __del_derived__() {
        PyType self_type = getType();
        PyObject impl = self_type.lookup("__del__");
        if (impl != null) {
            impl.__get__(this, self_type).__call__();
        }
    }

    public void __ensure_finalizer__() {
        FinalizeTrigger.ensureFinalizer(this);
    }

    /* TraverseprocDerived implementation */
    public int traverseDerived(Visitproc visit, Object arg) {
        int retVal;
        for (int i = 0; i < slots.length; ++i) {
            if (slots[i] != null) {
                retVal = visit.visit(slots[i], arg);
                if (retVal != 0) {
                    return retVal;
                }
            }
        }
        retVal = visit.visit(objtype, arg);
        return retVal != 0 ? retVal : traverseDictIfAny(visit, arg);
    }
    /* end of TraverseprocDerived implementation */

     `decls;
  }
define: (ClassBodyDeclarations)pair
  `trailer;
  `last;
define: (ClassBodyDeclarations)binary
  public PyObject `binary(PyObject other) {
    PyType self_type = getType();
    PyObject impl = self_type.lookup(`strfy`(`binary));
    if (impl != null) {
      PyObject res = impl.__get__(this,self_type).__call__(other);
      if (res == Py.NotImplemented)
          return null;
      return res;
    }
    return super.`binary(other);
  }
define: (ClassBodyDeclarations)ibinary
  public PyObject `binary(PyObject other) {
    PyType self_type = getType();
    PyObject impl = self_type.lookup(`strfy`(`binary));
    if (impl != null) {
      PyObject res = impl.__get__(this,self_type).__call__(other);
      if (res == Py.NotImplemented)
          return null;
      return res;
    }
    return super.`binary(other);
  }
define: (ClassBodyDeclarations)unary
  public PyObject `unary() {
    PyType self_type = getType();
    PyObject impl = self_type.lookup(`strfy`(`unary));
    if (impl != null)
      return impl.__get__(this,self_type).__call__();
    return super.`unary();
  }
define: (ClassBodyDeclarations)typed_unary
  public `rettype `unary() {
    PyType self_type = getType();
    PyObject impl = self_type.lookup(`strfy`(`unary));
    if (impl != null) {
      PyObject res = impl.__get__(this,self_type).__call__();
      if (res instanceof `rettype)
        return (`rettype)res;
      throw Py.TypeError(`strfy`(`unary) + " returned non-" + `strfy`(`rettype_name) + " (type "
                         + res.getType().fastGetName() + ")");
    }
    return super.`unary();
  }
define: (ClassBodyDeclarations)userdict
  private PyObject dict;

  public PyObject fastGetDict() {
    return dict;
  }

  public PyObject getDict() {
    return dict;
  }

  public void setDict(PyObject newDict) {
    if (newDict instanceof PyStringMap || newDict instanceof PyDictionary ) {
      dict = newDict;
      if (dict.__finditem__(PyString.fromInterned("__del__")) != null &&
        !JyAttribute.hasAttr(this, JyAttribute.FINALIZE_TRIGGER_ATTR)) {
        FinalizeTrigger.ensureFinalizer(this);
      }
    }
    else {
      throw Py.TypeError("__dict__ must be set to a Dictionary " + newDict.getClass().getName());
    }
  }

  public void delDict() {
    // deleting an object's instance dict makes it grow a new one
    dict = new PyStringMap();  
  }

define: (ClassBodyDeclarations)ctr
  public `concat`(`base,Derived)(PyType subtype,`extraargs) {
    super(subtype,`extra);
    slots = new PyObject[subtype.getNumSlots()];
    if (subtype.needsFinalizer()) {
      FinalizeTrigger.ensureFinalizer(this);
    }
  }

  public int traverseDictIfAny(Visitproc visit, Object arg) {
    return 0;
  }

define: (ClassBodyDeclarations)ctr_userdict
  public `concat`(`base,Derived)(PyType subtype,`extraargs) {
    super(subtype,`extra);
    slots = new PyObject[subtype.getNumSlots()];
    dict = subtype.instDict();
    if (subtype.needsFinalizer()) {
      FinalizeTrigger.ensureFinalizer(this);
    }
  }

  public int traverseDictIfAny(Visitproc visit, Object arg) {
    return visit.visit(dict, arg);
  }

define: (ClassBodyDeclarations)toString
  public String toString() {
    PyType self_type = getType();
    PyObject impl = self_type.lookup("__repr__");
    if (impl != null) {
      PyObject res = impl.__get__(this,self_type).__call__();
      if (!(res instanceof PyString))
        throw Py.TypeError("__repr__ returned non-string (type "
                           + res.getType().fastGetName() + ")");
      return ((PyString)res).toString();
    }
    return super.toString();
  }