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1   /*
2    * Copyright  2000-2004 The Apache Software Foundation
3    *
4    *  Licensed under the Apache License, Version 2.0 (the "License"); 
5    *  you may not use this file except in compliance with the License.
6    *  You may obtain a copy of the License at
7    *
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    *
10   *  Unless required by applicable law or agreed to in writing, software
11   *  distributed under the License is distributed on an "AS IS" BASIS,
12   *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   *  See the License for the specific language governing permissions and
14   *  limitations under the License. 
15   *
16   */
17  package org.apache.bcel.verifier;
18  
19  /***
20   * The NativeVerifier class implements a main(String[] args) method that's
21   * roughly compatible to the one in the Verifier class, but that uses the
22   * JVM's internal verifier for its class file verification.
23   * This can be used for comparison runs between the JVM-internal verifier
24   * and JustIce.
25   *
26   * @version $Id: NativeVerifier.java 386056 2006-03-15 11:31:56Z tcurdt $
27   * @author Enver Haase
28   */
29  public abstract class NativeVerifier {
30  
31      /***
32       * This class must not be instantiated.
33       */
34      private NativeVerifier() {
35      }
36  
37  
38      /***
39       * Works only on the first argument.
40       */
41      public static void main( String[] args ) {
42          if (args.length != 1) {
43              System.out.println("Verifier front-end: need exactly one argument.");
44              System.exit(1);
45          }
46          int dotclasspos = args[0].lastIndexOf(".class");
47          if (dotclasspos != -1) {
48              args[0] = args[0].substring(0, dotclasspos);
49          }
50          args[0] = args[0].replace('/', '.');
51          //System.out.println(args[0]);
52          try {
53              Class.forName(args[0]);
54          } catch (ExceptionInInitializerError eiie) { //subclass of LinkageError!
55              System.out.println("NativeVerifier: ExceptionInInitializerError encountered on '"
56                      + args[0] + "'.");
57              System.out.println(eiie);
58              System.exit(1);
59          } catch (LinkageError le) {
60              System.out.println("NativeVerifier: LinkageError encountered on '" + args[0] + "'.");
61              System.out.println(le);
62              System.exit(1);
63          } catch (ClassNotFoundException cnfe) {
64              System.out.println("NativeVerifier: FILE NOT FOUND: '" + args[0] + "'.");
65              System.exit(1);
66          } catch (Throwable t) {
67              System.out.println("NativeVerifier: Unspecified verification error on'" + args[0]
68                      + "'.");
69              System.exit(1);
70          }
71          System.out.println("NativeVerifier: Class file '" + args[0] + "' seems to be okay.");
72          System.exit(0);
73      }
74  }