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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 org.jetbrains.annotations.*;

import mockit.internal.util.*;

/**
 * Adapts the {@code org.hamcrest.Matcher} interface to {@link ArgumentMatcher}.
 */
@SuppressWarnings("UnnecessaryFullyQualifiedName")
public final class HamcrestAdapter implements ArgumentMatcher
{
   @NotNull private final org.hamcrest.Matcher hamcrestMatcher;

   @NotNull public static ArgumentMatcher create(@NotNull Object matcher)
   {
      if (matcher instanceof org.hamcrest.Matcher) {
         return new HamcrestAdapter((org.hamcrest.Matcher) matcher);
      }

      return new ReflectiveMatcher(matcher);
   }

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

   public boolean matches(@Nullable Object argValue)
   {
      return hamcrestMatcher.matches(argValue);
   }

   public void writeMismatchPhrase(@NotNull ArgumentMismatch argumentMismatch)
   {
      org.hamcrest.Description strDescription = new org.hamcrest.StringDescription();
      hamcrestMatcher.describeTo(strDescription);
      argumentMismatch.append(strDescription.toString());
   }

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

      return getArgumentValueFromMatcherIfAvailable(innermostMatcher);
   }

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

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

      assert innerMatcher != null;
      return innerMatcher;
   }

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

      return null;
   }
}