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JMockit is a Java toolkit for developer (unit/integration) testing. It contains mocking APIs and other tools, supporting both JUnit and TestNG. The mocking APIs allow all kinds of Java code, without testability restrictions, to be tested in isolation from selected dependencies.

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/*
 * Copyright (c) 2006-2012 Rogério Liesenfeld
 * This file is subject to the terms of the MIT license (see LICENSE.txt).
 */
package mockit.internal;

import java.io.*;
import java.lang.reflect.*;
import java.util.*;

import mockit.external.asm4.*;
import mockit.internal.util.*;

@SuppressWarnings("FieldAccessedSynchronizedAndUnsynchronized")
final class SuperConstructorCollector extends ClassVisitor
{
   static final SuperConstructorCollector INSTANCE = new SuperConstructorCollector();

   private final Map cache = new HashMap();
   private String constructorDesc;
   private boolean samePackage;

   private SuperConstructorCollector() {}

   synchronized String findConstructor(String classDesc, String superClassDesc)
   {
      constructorDesc = cache.get(superClassDesc);

      if (constructorDesc != null) {
         return constructorDesc;
      }

      findIfBothClassesAreInSamePackage(classDesc, superClassDesc);

      ClassReader cr = createClassReader(superClassDesc);
      try { cr.accept(this, ClassReader.SKIP_DEBUG); } catch (VisitInterruptedException ignore) {}

      cache.put(superClassDesc, constructorDesc);
      
      return constructorDesc;
   }

   private void findIfBothClassesAreInSamePackage(String classDesc, String superClassDesc)
   {
      int p1 = classDesc.lastIndexOf('/');
      int p2 = superClassDesc.lastIndexOf('/');
      samePackage = p1 == p2 && (p1 < 0 || classDesc.substring(0, p1).equals(superClassDesc.substring(0, p2)));
   }

   private ClassReader createClassReader(String classDesc)
   {
      try {
         return ClassFile.readClass(classDesc);
      }
      catch (IOException e) {
         throw new RuntimeException("Failed to read class file for " + classDesc.replace('/', '.'), e);
      }
   }

   @Override
   public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions)
   {
      if (isAccessible(access) && "".equals(name)) {
         constructorDesc = desc;
         throw VisitInterruptedException.INSTANCE;
      }

      return null;
   }

   private boolean isAccessible(int access) { return access != Modifier.PRIVATE && (access != 0 || samePackage); }
}