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PyCell.java
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52 lines (42 loc) · 1.35 KB
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/* Copyright (c) Jython Developers */
package org.python.core;
import org.python.expose.ExposedGet;
import org.python.expose.ExposedType;
/**
* The Python cell type.
*
* Cells are used to implement variables referenced by multiple scopes.
*/
@ExposedType(name = "cell", isBaseType = false)
public class PyCell extends PyObject implements Traverseproc {
public static final PyType TYPE = PyType.fromClass(PyCell.class);
/** The underlying content of the cell, or null. */
public PyObject ob_ref;
public PyCell() {
super(TYPE);
}
@ExposedGet(name = "cell_contents")
public PyObject getCellContents() {
if (ob_ref == null) {
throw Py.ValueError("Cell is empty");
}
return ob_ref;
}
@Override
public String toString() {
if (ob_ref == null) {
return String.format("<cell at %s: empty>", Py.idstr(this));
}
return String.format("<cell at %s: %.80s object at %s>", Py.idstr(this),
ob_ref.getType().getName(), Py.idstr(ob_ref));
}
/* Traverseproc implementation */
@Override
public int traverse(Visitproc visit, Object arg) {
return ob_ref != null ? visit.visit(ob_ref, arg) : 0;
}
@Override
public boolean refersDirectlyTo(PyObject ob) {
return ob != null && ob_ref == ob;
}
}