/*
    * 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;
   
  /**
   * Matches a decimal argument against another within a given margin of error.
   */
  public final class NumericEqualityMatcher implements ArgumentMatcher<NumericEqualityMatcher> {
      private final double value;
      private final double delta;
  
      public NumericEqualityMatcher(double value, double delta) {
          this.value = value;
          this.delta = delta;
      }
  
      @Override
      @SuppressWarnings("FloatingPointEquality")
      public boolean same(@NonNull NumericEqualityMatcher other) {
          return value == other.value && delta == other.delta;
      }
  
      @Override
      @SuppressWarnings("ParameterNameDiffersFromOverriddenParameter")
      public boolean matches(@Nullable Object decimalValue) {
          return decimalValue instanceof Number && actualDelta((Number) decimalValue) <= delta;
      }
  
      private double actualDelta(@NonNull Number decimalValue) {
          return Math.abs(decimalValue.doubleValue() - value);
      }
  
      @Override
      public void writeMismatchPhrase(@NonNull ArgumentMismatch argumentMismatch) {
          argumentMismatch.append("a numeric value within ").append(delta).append(" of ").append(value);
      }
  }