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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) 2006-2011 Rogério Liesenfeld
 * This file is subject to the terms of the MIT license (see LICENSE.txt).
 */
package mockit.external.hamcrest;

import java.lang.reflect.*;

import mockit.internal.util.*;

import static mockit.internal.util.Utilities.*;

/**
 * Adapts the {@code org.hamcrest.Matcher} interface to {@link mockit.external.hamcrest.Matcher}.
 */
@SuppressWarnings({"UnnecessaryFullyQualifiedName"})
public final class HamcrestAdapter extends BaseMatcher
{
   private final org.hamcrest.Matcher hamcrestMatcher;

   public static  HamcrestAdapter create(final Object matcher)
   {
      org.hamcrest.Matcher hamcrestMatcher;

      if (matcher instanceof org.hamcrest.Matcher) {
         //noinspection unchecked
         hamcrestMatcher = (org.hamcrest.Matcher) matcher;
      }
      else {
         hamcrestMatcher = new org.hamcrest.BaseMatcher()
         {
            Method handler;

            public boolean matches(Object value)
            {
               if (handler == null) {
                  handler = Utilities.findNonPrivateHandlerMethod(matcher);
               }

               Boolean result = Utilities.invoke(matcher, handler, value);

               return result == null || result;
            }

            public void describeTo(org.hamcrest.Description description)
            {
            }
         };
      }

      return new HamcrestAdapter(hamcrestMatcher);
   }

   private HamcrestAdapter(org.hamcrest.Matcher matcher)
   {
      hamcrestMatcher = matcher;
   }

   public boolean matches(Object item)
   {
      return hamcrestMatcher.matches(item);
   }

   public void describeTo(Description description)
   {
      org.hamcrest.Description strDescription = new org.hamcrest.StringDescription();
      hamcrestMatcher.describeTo(strDescription);
      description.appendText(strDescription.toString());
   }

   public Object getInnerValue()
   {
      Object innermostMatcher = getInnermostMatcher();

      return getArgumentValueFromMatcherIfAvailable(innermostMatcher);
   }

   private Object getInnermostMatcher()
   {
      org.hamcrest.Matcher innerMatcher = hamcrestMatcher;

      while (
         innerMatcher instanceof org.hamcrest.core.Is ||
         innerMatcher instanceof org.hamcrest.core.IsNot
      ) {
         //noinspection unchecked
         innerMatcher = getField(innerMatcher.getClass(), org.hamcrest.Matcher.class, innerMatcher);
      }

      return innerMatcher;
   }

   private Object getArgumentValueFromMatcherIfAvailable(Object argMatcher)
   {
      if (
         argMatcher instanceof org.hamcrest.core.IsEqual ||
         argMatcher instanceof org.hamcrest.core.IsSame ||
         "org.hamcrest.number.OrderingComparison".equals(argMatcher.getClass().getName())
      ) {
         return getField(argMatcher.getClass(), Object.class, argMatcher);
      }

      return null;
   }
}