01: /*
02: * Copyright (c) 2003-2008, Franz-Josef Elmer, All rights reserved.
03: *
04: * Redistribution and use in source and binary forms, with or without
05: * modification, are permitted provided that the following conditions are met:
06: *
07: * - Redistributions of source code must retain the above copyright notice,
08: * this list of conditions and the following disclaimer.
09: * - Redistributions in binary form must reproduce the above copyright notice,
10: * this list of conditions and the following disclaimer in the documentation
11: * and/or other materials provided with the distribution.
12: *
13: * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
14: * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
15: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
17: * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18: * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19: * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
20: * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
21: * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
22: * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
23: * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24: */
25: package classycle.classfile;
26:
27: import java.io.DataInputStream;
28: import java.io.FileInputStream;
29: import java.io.IOException;
30:
31: /**
32: * Application which prints the {@link Constant} pool of a class file onto the
33: * console.
34: *
35: * @author Franz-Josef Elmer
36: */
37: public class ConstantPoolPrinter {
38: /**
39: * Reads a class file and prints the constant pool onto <tt>System.out</tt>.
40: * @param args File name of the class file in <tt>args[0]</tt>
41: */
42: public static void main(String[] args) {
43: if (args.length == 0) {
44: System.out
45: .println("Usage: java classycle.classfile.ConstantPoolPrinter <class files>");
46: }
47: for (int i = 0; i < args.length; i++) {
48: investigate(args[i]);
49: }
50: }
51:
52: private static void investigate(String fileName) {
53: DataInputStream stream = null;
54: try {
55: stream = new DataInputStream(new FileInputStream(fileName));
56: Constant[] pool = Constant.extractConstantPool(stream);
57: printConstantPool(pool);
58: } catch (IOException e) {
59: System.out.println(e);
60: } finally {
61: try {
62: stream.close();
63: } catch (IOException e) {
64: }
65: }
66: }
67:
68: private static void printConstantPool(Constant[] pool) {
69: for (int i = 0; i < pool.length; i++) {
70: System.out.println(i + ": " + pool[i]);
71: }
72: }
73: } //class
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