OpenSim-Test/OpenSim/Tests/Common/QuaternionToleranceConstraint.cs

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using System;
using OpenMetaverse;
using NUnit.Framework;
using NUnit.Framework.Constraints;

namespace OpenSim.Tests.Common
{
    public class QuaternionToleranceConstraint : ANumericalToleranceConstraint
    {
        private Quaternion _baseValue;
        private Quaternion _valueToBeTested;

        public QuaternionToleranceConstraint(Quaternion baseValue, double tolerance) : base(tolerance)
        {
            _baseValue = baseValue;
        }

        /// <summary>
        /// Test whether the constraint is satisfied by a given value
        /// </summary>
        /// <param name="valueToBeTested">The value to be tested</param>
        /// <returns>
        /// True for success, false for failure
        /// </returns>
        public override bool Matches(object valueToBeTested)
        {
            if (valueToBeTested == null)
            {
                throw new ArgumentException("Constraint cannot be used upon null values.");
            }
            if (valueToBeTested.GetType() != typeof (Quaternion))
            {
                throw new ArgumentException("Constraint cannot be used upon non quaternion values.");
            }

            _valueToBeTested = (Quaternion)valueToBeTested;

            return (IsWithinDoubleConstraint(_valueToBeTested.X, _baseValue.X) &&
                    IsWithinDoubleConstraint(_valueToBeTested.Y, _baseValue.Y) &&
                    IsWithinDoubleConstraint(_valueToBeTested.Z, _baseValue.Z) &&
                    IsWithinDoubleConstraint(_valueToBeTested.W, _baseValue.W));
        }

        public override void WriteDescriptionTo(MessageWriter writer)
        {
            writer.WriteExpectedValue(
                string.Format("A value {0} within tolerance of plus or minus {1}", _baseValue, _tolerance));
        }

        public override void WriteActualValueTo(MessageWriter writer)
        {
            writer.WriteActualValue(_valueToBeTested);
        }
    }
}