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/*
* Copyright 2002 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*
*/
package sun.jvm.hotspot.bugspot;
import java.io.*;
/** Scans a .java file for the package that it is in. */
public class PackageScanner {
public PackageScanner() {
}
public String scan(String filename) {
return scan(new File(filename));
}
/** Returns the String comprising the package name of the classes in
this .java file. Returns the (non-null) empty string if any
error occurs or if the classes are in the unnamed package. */
public String scan(File file) {
BufferedReader buf = null;
String res = "";
try {
buf = new BufferedReader(new FileReader(file));
StreamTokenizer tok = new StreamTokenizer(buf);
tok.slashStarComments(true);
tok.slashSlashComments(true);
if (tok.nextToken() != StreamTokenizer.TT_WORD) {
return res;
}
if (!tok.sval.equals("package")) {
return res;
}
if (tok.nextToken() != StreamTokenizer.TT_WORD) {
return res;
}
res = tok.sval;
return res;
} catch (FileNotFoundException e) {
return res;
} catch (IOException e) {
return res;
} finally {
try {
if (buf != null) {
buf.close();
}
} catch (IOException e) {
}
}
}
public static void main(String[] args) {
if (args.length != 1) {
usage();
}
System.out.println(new PackageScanner().scan(args[0]));
}
private static void usage() {
System.err.println("Usage: java PackageScanner <.java file name>");
System.err.println("Prints package the .java file is in to stdout.");
System.exit(1);
}
}
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