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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.expectations.argumentMatching;

import mockit.internal.util.*;

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

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

      return new ReflectiveMatcher(matcher);
   }

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

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

   public void writeMismatchPhrase(ArgumentMismatch argumentMismatch)
   {
      org.hamcrest.Description strDescription = new org.hamcrest.StringDescription();
      hamcrestMatcher.describeTo(strDescription);
      argumentMismatch.append(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) {
         innerMatcher = FieldReflection.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 FieldReflection.getField(argMatcher.getClass(), Object.class, argMatcher);
      }

      return null;
   }
}