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chain.java
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109 lines (88 loc) · 3.14 KB
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/* Copyright (c) 2012 Jython Developers */
package org.python.modules.itertools;
import org.python.core.ArgParser;
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.ExposedClassMethod;
import org.python.expose.ExposedNew;
import org.python.expose.ExposedMethod;
import org.python.expose.ExposedType;
@ExposedType(name = "itertools.chain", base = PyObject.class, doc = chain.chain_doc)
public class chain extends PyIterator {
public static final PyType TYPE = PyType.fromClass(chain.class);
private itertools.ItertoolsIterator iter;
public static final String chain_doc =
"chain(*iterables) --> chain object\n\n" +
"Return a chain object whose .next() method returns elements from the\n" +
"first iterable until it is exhausted, then elements from the next\n" +
"iterable, until all of the iterables are exhausted.";
public chain() {
super();
}
public chain(PyType subType) {
super(subType);
}
public chain(PyObject iterable) {
super();
chain___init__(iterable.__iter__());
}
@ExposedClassMethod
public static final PyObject from_iterable(PyType type, PyObject iterable) {
return new chain(iterable);
}
/**
* Creates an iterator that iterates over a <i>chain</i> of iterables.
*/
@ExposedNew
@ExposedMethod
final void chain___init__(final PyObject[] args, String[] kwds) {
ArgParser ap = new ArgParser("chain", args, kwds, "iterables");
ap.noKeywords();
//ArgParser always returns a PyTuple - I wonder why we make it pass back a PyObject?
PyTuple tuple = (PyTuple)ap.getList(0);
chain___init__(tuple.__iter__());
}
private void chain___init__(final PyObject superIterator) {
iter = new itertools.ItertoolsIterator() {
int iteratorIndex = 0;
PyObject currentIterator = new PyObject();
public PyObject __iternext__() {
PyObject nextIterable;
PyObject next = null;
do {
next = nextElement(currentIterator);
if (next != null) {
break;
}
}
while ((nextIterable = nextElement(superIterator)) != null &&
(currentIterator = nextIterable.__iter__()) != null);
return next;
}
};
}
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));
}
}