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comparison agent/src/share/classes/sun/jvm/hotspot/bugspot/PackageScanner.java @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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children c18cbe5936b8
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 2002 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 package sun.jvm.hotspot.bugspot;
26
27 import java.io.*;
28
29 /** Scans a .java file for the package that it is in. */
30
31 public class PackageScanner {
32
33 public PackageScanner() {
34 }
35
36 public String scan(String filename) {
37 return scan(new File(filename));
38 }
39
40 /** Returns the String comprising the package name of the classes in
41 this .java file. Returns the (non-null) empty string if any
42 error occurs or if the classes are in the unnamed package. */
43 public String scan(File file) {
44 BufferedReader buf = null;
45 String res = "";
46 try {
47 buf = new BufferedReader(new FileReader(file));
48 StreamTokenizer tok = new StreamTokenizer(buf);
49 tok.slashStarComments(true);
50 tok.slashSlashComments(true);
51 if (tok.nextToken() != StreamTokenizer.TT_WORD) {
52 return res;
53 }
54 if (!tok.sval.equals("package")) {
55 return res;
56 }
57 if (tok.nextToken() != StreamTokenizer.TT_WORD) {
58 return res;
59 }
60 res = tok.sval;
61 return res;
62 } catch (FileNotFoundException e) {
63 return res;
64 } catch (IOException e) {
65 return res;
66 } finally {
67 try {
68 if (buf != null) {
69 buf.close();
70 }
71 } catch (IOException e) {
72 }
73 }
74 }
75
76 public static void main(String[] args) {
77 if (args.length != 1) {
78 usage();
79 }
80
81 System.out.println(new PackageScanner().scan(args[0]));
82 }
83
84 private static void usage() {
85 System.err.println("Usage: java PackageScanner <.java file name>");
86 System.err.println("Prints package the .java file is in to stdout.");
87 System.exit(1);
88 }
89 }