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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  import org.apache.bcel.Repository;
20  import org.apache.bcel.classfile.JavaClass;
21  
22  /***
23   * This class has a main method implementing a demonstration program
24   * of how to use the VerifierFactoryObserver. It transitively verifies
25   * all class files encountered; this may take up a lot of time and,
26   * more notably, memory.
27   *
28   * @version $Id: TransitiveHull.java 386056 2006-03-15 11:31:56Z tcurdt $
29   * @author Enver Haase
30   */
31  public class TransitiveHull implements VerifierFactoryObserver {
32  
33      /*** Used for indentation. */
34      private int indent = 0;
35  
36  
37      /*** Not publicly instantiable. */
38      private TransitiveHull() {
39      }
40  
41  
42      /* Implementing VerifierFactoryObserver. */
43      public void update( String classname ) {
44          System.gc(); // avoid swapping if possible.
45          for (int i = 0; i < indent; i++) {
46              System.out.print(" ");
47          }
48          System.out.println(classname);
49          indent += 1;
50          Verifier v = VerifierFactory.getVerifier(classname);
51          VerificationResult vr;
52          vr = v.doPass1();
53          if (vr != VerificationResult.VR_OK) {
54              System.out.println("Pass 1:\n" + vr);
55          }
56          vr = v.doPass2();
57          if (vr != VerificationResult.VR_OK) {
58              System.out.println("Pass 2:\n" + vr);
59          }
60          if (vr == VerificationResult.VR_OK) {
61              try {
62                  JavaClass jc = Repository.lookupClass(v.getClassName());
63                  for (int i = 0; i < jc.getMethods().length; i++) {
64                      vr = v.doPass3a(i);
65                      if (vr != VerificationResult.VR_OK) {
66                          System.out.println(v.getClassName() + ", Pass 3a, method " + i + " ['"
67                                  + jc.getMethods()[i] + "']:\n" + vr);
68                      }
69                      vr = v.doPass3b(i);
70                      if (vr != VerificationResult.VR_OK) {
71                          System.out.println(v.getClassName() + ", Pass 3b, method " + i + " ['"
72                                  + jc.getMethods()[i] + "']:\n" + vr);
73                      }
74                  }
75              } catch (ClassNotFoundException e) {
76                  System.err.println("Could not find class " + v.getClassName() + " in Repository");
77              }
78          }
79          indent -= 1;
80      }
81  
82  
83      /***
84       * This method implements a demonstration program
85       * of how to use the VerifierFactoryObserver. It transitively verifies
86       * all class files encountered; this may take up a lot of time and,
87       * more notably, memory.
88       */
89      public static void main( String[] args ) {
90          if (args.length != 1) {
91              System.out.println("Need exactly one argument: The root class to verify.");
92              System.exit(1);
93          }
94          int dotclasspos = args[0].lastIndexOf(".class");
95          if (dotclasspos != -1) {
96              args[0] = args[0].substring(0, dotclasspos);
97          }
98          args[0] = args[0].replace('/', '.');
99          TransitiveHull th = new TransitiveHull();
100         VerifierFactory.attach(th);
101         VerifierFactory.getVerifier(args[0]); // the observer is called back and does the actual trick.
102         VerifierFactory.detach(th);
103     }
104 }