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JMockit is a Java toolkit for automated developer testing. It contains mocking/faking APIs and a code coverage tool, 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 Rogério Liesenfeld
 * This file is subject to the terms of the MIT license (see LICENSE.txt).
 */
package mockit.internal.util;

import java.lang.reflect.*;
import java.math.*;
import java.util.*;
import java.util.concurrent.atomic.*;
import javax.annotation.*;

import mockit.internal.state.*;
import static mockit.internal.util.AutoBoxing.*;

/**
 * Miscellaneous utility constants and methods.
 */
public final class Utilities
{
   @Nonnull public static final Object[] NO_ARGS = {};
   public static final float JAVA_VERSION;
   public static final boolean JAVA8;
   public static final boolean JAVA9;
   public static final boolean HOTSPOT_VM;

   static
   {
      JAVA_VERSION = Float.parseFloat(System.getProperty("java.specification.version"));
      JAVA8 = JAVA_VERSION >= 1.8F;
      JAVA9 = JAVA_VERSION >= 9.0F;
      String vmName = System.getProperty("java.vm.name");
      HOTSPOT_VM = vmName.contains("HotSpot") || vmName.contains("OpenJDK");
   }

   private Utilities() {}

   public static void ensureThatMemberIsAccessible(@Nonnull AccessibleObject classMember)
   {
      if (!classMember.isAccessible()) {
         classMember.setAccessible(true);
      }
   }

   public static void ensureThatClassIsInitialized(@Nonnull Class aClass)
   {
      ExecutingTest executingTest = TestRun.getExecutingTest();
      boolean previousFlag = executingTest.setShouldIgnoreMockingCallbacks(true);

      try {
         Class.forName(aClass.getName(), true, aClass.getClassLoader());
      }
      catch (ClassNotFoundException ignore) {}
      catch (LinkageError e) {
         StackTrace.filterStackTrace(e);
         e.printStackTrace();
      }
      finally {
         executingTest.setShouldIgnoreMockingCallbacks(previousFlag);
      }
   }

   @Nonnull
   public static Class getClassType(@Nonnull Type declaredType)
   {
      while (true) {
         if (declaredType instanceof Class) {
            return (Class) declaredType;
         }

         if (declaredType instanceof ParameterizedType) {
            return (Class) ((ParameterizedType) declaredType).getRawType();
         }

         if (declaredType instanceof TypeVariable) {
            declaredType = ((TypeVariable) declaredType).getBounds()[0];
            continue;
         }

         throw new IllegalArgumentException("Type of unexpected kind: " + declaredType);
      }
   }

   public static boolean containsReference(@Nonnull List references, @Nullable Object toBeFound)
   {
      return indexOfReference(references, toBeFound) >= 0;
   }

   public static int indexOfReference(@Nonnull List references, @Nullable Object toBeFound)
   {
      for (int i = 0, n = references.size(); i < n; i++) {
         if (references.get(i) == toBeFound) {
            return i;
         }
      }

      return -1;
   }

   public static int indexOfReference(@Nonnull Object[] references, @Nullable Object toBeFound)
   {
      for (int i = 0, n = references.length; i < n; i++) {
         if (references[i] == toBeFound) {
            return i;
         }
      }

      return -1;
   }

   public static boolean isClassAssignableTo(@Nonnull List> fromClasses, @Nonnull Class toClass)
   {
      int n = fromClasses.size();

      for (int i = 0; i < n; i++) {
         Class fromClass = fromClasses.get(i);

         if (toClass == fromClass || toClass.isAssignableFrom(fromClass)) {
            return true;
         }
      }

      return false;
   }

   @Nullable
   public static Class findClassAssignableFrom(@Nonnull List> toClasses, @Nonnull Class fromClass)
   {
      for (int i = 0; i < toClasses.size(); i++) {
         Class toClass = toClasses.get(i);

         if (toClass == fromClass || toClass.isAssignableFrom(fromClass)) {
            return toClass;
         }
      }

      return null;
   }

   @SuppressWarnings("OverlyComplexMethod")
   @Nullable
   public static Object convertFromString(@Nonnull Class targetType, @Nullable String value)
   {
      if (value != null) {
         if (targetType == String.class) {
            return value;
         }
         else if (targetType == char.class || targetType == Character.class) {
            return value.charAt(0);
         }
         else if (targetType.isPrimitive()) {
            Class wrapperClass = getWrapperType(targetType);
            assert wrapperClass != null;
            return newWrapperInstance(wrapperClass, value);
         }
         else if (isWrapperOfPrimitiveType(targetType)) {
            return newWrapperInstance(targetType, value);
         }
         else if (targetType == BigDecimal.class) {
            return new BigDecimal(value.trim());
         }
         else if (targetType == BigInteger.class) {
            return new BigInteger(value.trim());
         }
         else if (targetType == AtomicInteger.class) {
            return new AtomicInteger(Integer.parseInt(value.trim()));
         }
         else if (targetType == AtomicLong.class) {
            return new AtomicLong(Long.parseLong(value.trim()));
         }
         else if (targetType.isEnum()) {
            @SuppressWarnings({"rawtypes", "unchecked"})
            Class enumType = (Class) targetType;
            return Enum.valueOf(enumType, value);
         }
      }

      return null;
   }

   @Nonnull
   private static Object newWrapperInstance(@Nonnull Class wrapperClass, @Nonnull String value)
   {
      Class[] constructorParameters = {String.class};
      return ConstructorReflection.newInstance(wrapperClass, constructorParameters, value.trim());
   }

   public static boolean calledFromSpecialThread()
   {
      Thread currentThread = Thread.currentThread();
      return
         "java.awt.EventDispatchThread".equals(currentThread.getClass().getName()) ||
         "system".equals(currentThread.getThreadGroup().getName());
   }
}