using System; using System.Collections; using System.Collections.Generic; namespace NUnit.Framework.Constraints { public abstract class ComparisonConstraint : Constraint { protected object expected; protected bool lessComparisonResult; protected bool equalComparisonResult; protected bool greaterComparisonResult; private ComparisonAdapter comparer = ComparisonAdapter.Default; protected ComparisonConstraint(object value, bool lessComparisonResult, bool equalComparisonResult, bool greaterComparisonResult, string predicate) : base(value) { expected = value; this.lessComparisonResult = lessComparisonResult; this.equalComparisonResult = equalComparisonResult; this.greaterComparisonResult = greaterComparisonResult; Description = predicate + " " + MsgUtils.FormatValue(expected); } public override ConstraintResult ApplyTo<TActual>(TActual actual) { if (expected == null) throw new ArgumentException("Cannot compare using a null reference", "expected"); if (actual == null) throw new ArgumentException("Cannot compare to null reference", "actual"); int num = comparer.Compare(expected, actual); bool isSuccess = (num < 0 && greaterComparisonResult) || (num == 0 && equalComparisonResult) || (num > 0 && lessComparisonResult); return new ConstraintResult(this, actual, isSuccess); } public ComparisonConstraint Using(IComparer comparer) { this.comparer = ComparisonAdapter.For(comparer); return this; } public ComparisonConstraint Using<T>(IComparer<T> comparer) { this.comparer = ComparisonAdapter.For(comparer); return this; } public ComparisonConstraint Using<T>(Comparison<T> comparer) { this.comparer = ComparisonAdapter.For(comparer); return this; } } }