/*
    * Copyright (c) 2006 JMockit developers
    * This file is subject to the terms of the MIT license (see LICENSE.txt).
    */
   package mockit.internal.expectations.argumentMatching;
   
   import edu.umd.cs.findbugs.annotations.NonNull;
   import edu.umd.cs.findbugs.annotations.Nullable;
   
  import java.lang.reflect.Array;
  
  public class EqualityMatcher implements ArgumentMatcher<EqualityMatcher> {
      @Nullable
      final Object object;
  
      EqualityMatcher(@Nullable Object equalArg) {
          object = equalArg;
      }
  
      @Override
      public final boolean same(@NonNull EqualityMatcher other) {
          return object == other.object;
      }
  
      @Override
      public boolean matches(@Nullable Object argValue) {
          return areEqual(argValue, object);
      }
  
      @Override
      public void writeMismatchPhrase(@NonNull ArgumentMismatch argumentMismatch) {
          argumentMismatch.appendFormatted(object);
      }
  
      public static boolean areEqual(@Nullable Object o1, @Nullable Object o2) {
          if (o1 == null) {
              return o2 == null;
          }
  
          return o2 != null && (o1 == o2 || areEqualWhenNonNull(o1, o2));
      }
  
      public static boolean areEqualWhenNonNull(@NonNull Object o1, @NonNull Object o2) {
          if (isArray(o1)) {
              return isArray(o2) && areArraysEqual(o1, o2);
          }
  
          return o1.equals(o2);
      }
  
      private static boolean isArray(@NonNull Object o) {
          return o.getClass().isArray();
      }
  
      private static boolean areArraysEqual(@NonNull Object array1, @NonNull Object array2) {
          int length1 = Array.getLength(array1);
  
          if (length1 != Array.getLength(array2)) {
              return false;
          }
  
          for (int i = 0; i < length1; i++) {
              Object value1 = Array.get(array1, i);
              Object value2 = Array.get(array2, i);
  
              if (!areEqual(value1, value2)) {
                  return false;
              }
          }
  
          return true;
      }
  }