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Java > Open Source Codes > PrintClass


1 /*
2  * PrintClass.java
3  *
4  * The contents of this file are subject to the terms of the Common Development
5  * and Distribution License (the License). You may not use this file except in
6  * compliance with the License.
7  *
8  * You can obtain a copy of the License at http://www.netbeans.org/cddl.html
9  * or http://www.netbeans.org/cddl.txt.
10  *
11  * When distributing Covered Code, include this CDDL Header Notice in each file
12  * and include the License file at http://www.netbeans.org/cddl.txt.
13  * If applicable, add the following below the CDDL Header, with the fields
14  * enclosed by brackets [] replaced by your own identifying information:
15  * "Portions Copyrighted [year] [name of copyright owner]"
16  *
17  * The Original Software is NetBeans. The Initial Developer of the Original
18  * Software is Sun Microsystems, Inc. Portions Copyright 2000-2001 Sun
19  * Microsystems, Inc. All Rights Reserved.
20  *
21  * Contributor(s): Thomas Ball
22  *
23  * Version: $Revision: 1.2 $
24  */
25
26 import org.netbeans.modules.classfile.*;
27 import java.io.*;
28 import java.util.*;
29
30 /**
31  * PrintClass: write a class as a println statement.
32  *
33  * @author Thomas Ball
34  */
35 public class PrintClass {
36     String JavaDoc thisClass;
37
38     PrintClass(String JavaDoc spec) {
39         thisClass = spec;
40     }
41
42     void print(PrintStream out) throws IOException {
43         ClassName cn = ClassName.getClassName(thisClass.replace('.', '/'));
44     InputStream is = findClassStream(cn.getType());
45     if (is == null) {
46         System.err.println("couldn't find class: " +
47                    cn.getExternalName());
48         return;
49     }
50     ClassFile cfile = new ClassFile(is);
51         out.println(cfile);
52     }
53
54     private InputStream findClassStream(String JavaDoc className) {
55         InputStream is =
56             ClassLoader.getSystemClassLoader().getResourceAsStream(className + ".class");
57         return is;
58     }
59
60     /**
61      * An error routine which displays the command line usage
62      * before exiting.
63      */
64     public static void usage() {
65         System.err.println(
66             "usage: java PrintClass <class> [ <class> ...]");
67         System.exit(1);
68     }
69
70     public static void main(String JavaDoc[] args) {
71         if (args.length == 0)
72             usage();
73
74         for (int i = 0; i < args.length; i++) {
75             if (args[i].charAt(0) == '-')
76                 usage();
77             else {
78                 try {
79                     PrintClass pc = new PrintClass(args[i]);
80                     pc.print(System.out);
81                 } catch (IOException e) {
82                     System.err.println("error accessing \"" + args[i] +
83                                        "\": " + e.toString());
84                 }
85             }
86         }
87     }
88 }
89
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