/src/NUnit/framework/Constraints/ResolvableConstraintExpression.cs

// ****************************************************************

// Copyright 2008, Charlie Poole

// This is free software licensed under the NUnit license. You may

// obtain a copy of the license at http://nunit.org

// ****************************************************************



using System;



namespace NUnit.Framework.Constraints

{

    /// <summary>

    /// ResolvableConstraintExpression is used to represent a compound

    /// constraint being constructed at a point where the last operator

    /// may either terminate the expression or may have additional 

    /// qualifying constraints added to it. 

    /// 

    /// It is used, for example, for a Property element or for

    /// an Exception element, either of which may be optionally

    /// followed by constraints that apply to the property or 

    /// exception.

    /// </summary>

    public class ResolvableConstraintExpression : ConstraintExpression, IResolveConstraint

    {

        /// <summary>

        /// Create a new instance of ResolvableConstraintExpression

        /// </summary>

        public ResolvableConstraintExpression() { }



        /// <summary>

        /// Create a new instance of ResolvableConstraintExpression,

        /// passing in a pre-populated ConstraintBuilder.

        /// </summary>

        public ResolvableConstraintExpression(ConstraintBuilder builder)

            : base(builder) { }



        /// <summary>

        /// Appends an And Operator to the expression

        /// </summary>

        public ConstraintExpression And

        {

            get { return this.Append(new AndOperator()); }

        }



        /// <summary>

        /// Appends an Or operator to the expression.

        /// </summary>

        public ConstraintExpression Or

        {

            get { return this.Append(new OrOperator()); }

        }



        #region IResolveConstraint Members

        /// <summary>

        /// Resolve the current expression to a Constraint

        /// </summary>

        Constraint IResolveConstraint.Resolve()

        {

            return builder.Resolve();

        }

        #endregion

    }

}