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izipLongest.java
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/* Copyright (c) Jython Developers */
package org.python.modules.itertools;
import org.python.core.Py;
import org.python.core.PyIterator;
import org.python.core.PyObject;
import org.python.core.PyTuple;
import org.python.core.PyType;
import org.python.core.Visitproc;
import org.python.expose.ExposedMethod;
import org.python.expose.ExposedNew;
import org.python.expose.ExposedType;
@ExposedType(name = "itertools.izip_longest", base = PyObject.class,
doc = izipLongest.izip_longest_doc)
public class izipLongest extends PyIterator {
public static final PyType TYPE = PyType.fromClass(izipLongest.class);
private PyIterator iter;
public izipLongest() {
super();
}
public izipLongest(PyType subType) {
super(subType);
}
public izipLongest(PyObject[] iterables, PyObject fillvalue) {
super();
izipLongest___init__(iterables, fillvalue);
}
public static final String izip_longest_doc =
"izip_longest(iter1 [,iter2 [...]], [fillvalue=None]) --> izip_longest object\n\n" +
"Return an izip_longest object whose .next() method returns a tuple where\n" +
"the i-th element comes from the i-th iterable argument. The .next()\n" +
"method continues until the longest iterable in the argument sequence\n" +
"is exhausted and then it raises StopIteration. When the shorter iterables\n" +
"are exhausted, the fillvalue is substituted in their place. The fillvalue\n" +
"defaults to None or can be specified by a keyword argument.";
/**
* Create an iterator that returns items from the iterable while <code>predicate(item)</code>
* is true. After which iteration is stopped.
*/
@ExposedNew
@ExposedMethod
final void izipLongest___init__(PyObject[] args, String[] kwds) {
PyObject[] iterables;
PyObject fillvalue;
if (kwds.length == 1 && kwds[0] == "fillvalue") {
fillvalue = args[args.length - 1];
iterables = new PyObject[args.length - 1];
System.arraycopy(args, 0, iterables, 0, args.length - 1);
} else {
fillvalue = Py.None;
iterables = args;
}
//XXX error checking on args
izipLongest___init__(iterables, fillvalue);
}
private void izipLongest___init__(final PyObject[] iterables, final PyObject fillvalue) {
final PyObject iterators[] = new PyObject[iterables.length];
final boolean exhausted[] = new boolean[iterables.length];
for (int i = 0; i < iterables.length; i++) {
iterators[i] = iterables[i].__iter__();
exhausted[i] = false;
}
iter = new itertools.ItertoolsIterator() {
int unexhausted = iterables.length;
@Override
public PyObject __iternext__() {
PyObject item[] = new PyObject[iterables.length];
for (int i = 0; i < iterables.length; i++) {
if (exhausted[i]) {
item[i] = fillvalue;
} else {
PyObject elem = iterators[i].__iternext__();
if (elem == null) {
unexhausted--;
exhausted[i] = true;
item[i] = fillvalue;
} else {
item[i] = elem;
}
}
}
if (unexhausted == 0) {
return null;
} else {
return new PyTuple(item);
}
}
};
}
public PyObject __iternext__() {
return iter.__iternext__();
}
@ExposedMethod
@Override
public PyObject next() {
return doNext(__iternext__());
}
/* Traverseproc implementation */
@Override
public int traverse(Visitproc visit, Object arg) {
int retVal = super.traverse(visit, arg);
if (retVal != 0) {
return retVal;
}
return iter != null ? visit.visit(iter, arg) : 0;
}
@Override
public boolean refersDirectlyTo(PyObject ob) {
return ob != null && (iter == ob || super.refersDirectlyTo(ob));
}
}