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