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1
3 package org.python.modules;
4
5 import org.python.core.*;
6
7 public class xreadlines {
8 private final static int CHUNKSIZE = 8192;
9
10 public static PyString __doc__xreadlines = new PyString(
11 "xreadlines(f)\n" +
12 "\n" +
13 "Return an xreadlines object for the file f."
14 );
15
16 public static PyObject xreadlines$(PyObject file) {
17 return new XReadlineObj(file);
18 }
19
20 public static class XReadlineObj extends PyObject {
21 private PyObject file;
22 private PyObject lines = null;
23 private int lineslen = 0;
24 private int lineno = 0;
25 private int abslineno = 0;
26
27 public XReadlineObj(PyObject file) {
28 this.file = file;
29 }
30
31 public PyObject __iter__() {
32 return new PySequenceIter(this);
33 }
34
35 public PyObject __finditem__(PyObject idx) {
36 return __finditem__(((PyInteger)idx.__int__()).getValue());
37 }
38
39 public PyObject __finditem__(int idx) {
40 if (idx != abslineno) {
41 throw Py.RuntimeError(
42 "xreadlines object accessed out of order");
43 }
44
45 if (lineno >= lineslen) {
46 lines = file.invoke("readlines", Py.newInteger(CHUNKSIZE));
47 lineno = 0;
48 lineslen = lines.__len__();
49 }
50 abslineno++;
51 return lines.__finditem__(lineno++);
52 }
53
54 public String  toString() {
55 return "<xreadlines object " + Py.idstr(this) + ">";
56 }
57
58 }
59 }
60
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Java API By Example, From Geeks To Geeks.