/// <summary>
/// Throws an exception if the given selector either is null or selects more than one entity
/// </summary>
/// <param name="selector">The selector to check</param>
/// <param name="selectorName">The name of the selector variable</param>
/// <param name="classHolderName">The name of the class holding the selector variable</param>
/// <exception cref="ArgumentNullException">If the selector is null</exception>
/// <exception cref="ArgumentException">If the selector selects too many entities</exception>
/// <returns>The checked selector</returns>
public static BaseSelector ValidateSingleSelectSelector(BaseSelector selector, string selectorName, string classHolderName)
{
if (!(selector ?? throw new ArgumentNullException(selectorName, selectorName + " may not be null.")).IsLimited())
{
throw new ArgumentException(classHolderName + " doesn't allow " + selectorName + " to select multiple entities", selectorName);
}
return(selector);
}
/// <summary>
/// Intializes a new <see cref="ScoreValue"/>
/// </summary>
/// <param name="selector">Selector for selecting the score</param>
/// <param name="scoreObject">The objective the score is in</param>
public ScoreValue(BaseSelector selector, Objective scoreObject)
{
Selector = selector;
ScoreObject = scoreObject;
}