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// ****************************************************************
// Copyright 2007, 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;
using System.Reflection;
namespace NUnit.Framework.Constraints
{
/// <summary>
/// PropertyExistsConstraint tests that a named property
/// exists on the object provided through Match.
///
/// Originally, PropertyConstraint provided this feature
/// in addition to making optional tests on the vaue
/// of the property. The two constraints are now separate.
/// </summary>
public class PropertyExistsConstraint : Constraint
{
private readonly string name;
Type actualType;
/// <summary>
/// Initializes a new instance of the <see cref="T:PropertyExistConstraint"/> class.
/// </summary>
/// <param name="name">The name of the property.</param>
public PropertyExistsConstraint(string name)
: base(name)
{
this.name = name;
}
/// <summary>
/// Test whether the property exists for a given object
/// </summary>
/// <param name="actual">The object to be tested</param>
/// <returns>True for success, false for failure</returns>
public override bool Matches(object actual)
{
this.actual = actual;
Guard.ArgumentNotNull(actual, "actual");
this.actualType = actual as Type;
if (actualType == null)
actualType = actual.GetType();
PropertyInfo property = actualType.GetProperty(name,
BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.GetProperty);
return property != null;
}
/// <summary>
/// Write the constraint description to a MessageWriter
/// </summary>
/// <param name="writer">The writer on which the description is displayed</param>
public override void WriteDescriptionTo(MessageWriter writer)
{
writer.Write("property " + name);
}
/// <summary>
/// Write the actual value for a failing constraint test to a
/// MessageWriter.
/// </summary>
/// <param name="writer">The writer on which the actual value is displayed</param>
public override void WriteActualValueTo(MessageWriter writer)
{
writer.WriteActualValue(actualType);
}
/// <summary>
/// Returns the string representation of the constraint.
/// </summary>
/// <returns></returns>
protected override string GetStringRepresentation()
{
return string.Format("<propertyexists {0}>", name);
}
}
}
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