/// <summary>
/// Displays the differences.
/// </summary>
/// <param name="writer">The writer.</param>
/// <param name="expected">The expected.</param>
/// <param name="actual">The actual.</param>
/// <param name="depth">The depth.</param>
private void DisplayDifferences( MessageWriter writer, object expected, object actual, int depth )
{
if ( expected is string && actual is string )
{
DisplayStringDifferences( writer, (string) expected, (string) actual );
}
else if ( expected is ICollection && actual is ICollection )
{
DisplayCollectionDifferences( writer, expected as ICollection, actual as ICollection, depth );
}
else if ( expected is Stream && actual is Stream )
{
DisplayStreamDifferences( writer, expected as Stream, actual as Stream, depth );
}
else if ( Tolerance != null )
{
writer.DisplayDifferences( expected, actual, Tolerance );
}
else
{
writer.DisplayDifferences( expected, actual );
}
}
/// <summary>
/// Write the failure message to the MessageWriter provided as an
/// argument. The default implementation simply passes the constraint
/// and the actual value to the writer, which then displays the
/// constraint description and the value.
///
/// Constraints that need to provide additional details, such as where
/// the error occured can override this.
/// </summary>
/// <exception cref="ArgumentNullException">if the message writer is null.</exception>
/// <param name="writer">The MessageWriter on which to display the message</param>
public virtual void WriteMessageTo( MessageWriter writer )
{
if ( writer == null )
{
throw new ArgumentNullException( "writer" );
}
writer.DisplayDifferences( this );
}