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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) 2006-2013 Rogério Liesenfeld
 * This file is subject to the terms of the MIT license (see LICENSE.txt).
 */
package mockit.internal.expectations.argumentMatching;

import java.lang.reflect.*;

import org.jetbrains.annotations.*;

import mockit.internal.util.*;

public final class ReflectiveMatcher implements ArgumentMatcher
{
   @NotNull private final Object handlerObject;
   @Nullable private Method handlerMethod;
   @Nullable private Object matchedValue;

   public ReflectiveMatcher(@NotNull Object handlerObject) { this.handlerObject = handlerObject; }

   public boolean matches(@Nullable Object argValue)
   {
      if (handlerMethod == null) {
         handlerMethod = MethodReflection.findNonPrivateHandlerMethod(handlerObject);
      }

      matchedValue = argValue;
      Boolean result = MethodReflection.invoke(handlerObject, handlerMethod, argValue);

      return result == null || result;
   }

   public void writeMismatchPhrase(@NotNull ArgumentMismatch argumentMismatch)
   {
      if (handlerMethod != null) {
         argumentMismatch.append(handlerMethod.getName()).append('(');
         argumentMismatch.appendFormatted(matchedValue);
         argumentMismatch.append(") (should return true, was false)");
      }
      else {
         argumentMismatch.append('?');
      }

      argumentMismatch.markAsFinished();
   }
}