/// <summary>
/// Matches this target instance using the context document.
/// </summary>
/// <param name="context">The evaluation context instance.</param>
/// <returns>The results of the evaluation of this target.</returns>
public TargetEvaluationValue Evaluate(EvaluationContext context)
{
if (context == null)
{
throw new ArgumentNullException("context");
}
// Set the default value.
_evaluationValue = TargetEvaluationValue.NoMatch;
// Resource
context.Trace("Evaluating Resource...");
context.AddIndent();
TargetEvaluationValue resourceEval = _resources.Evaluate(context, context.CurrentResource);
context.TraceContextValues();
context.Trace("Target item result: {0}", resourceEval);
context.RemoveIndent();
// Action
context.Trace("Evaluating Action...");
context.AddIndent();
TargetEvaluationValue actionEval = _actions.Evaluate(context, context.ContextDocument.Request.Action);
context.TraceContextValues();
context.Trace("Target item result: {0}", actionEval);
context.RemoveIndent();
context.Trace("Evaluating Subjects...");
context.AddIndent();
if (actionEval == TargetEvaluationValue.Match && resourceEval == TargetEvaluationValue.Match)
{
// Subjects
foreach (ctx.SubjectElement ctxSubject in context.ContextDocument.Request.Subjects)
{
context.Trace("Evaluating Subject: {0}", ctxSubject.SubjectCategory);
// Subject
TargetEvaluationValue subjectEval = _subjects.Evaluate(context, ctxSubject);
context.TraceContextValues();
if (subjectEval == TargetEvaluationValue.Indeterminate)
{
_evaluationValue = TargetEvaluationValue.Indeterminate;
}
else if (subjectEval == TargetEvaluationValue.Match)
{
_evaluationValue = TargetEvaluationValue.Match;
context.RemoveIndent();
context.Trace("Target item result: {0}", _evaluationValue);
return(_evaluationValue);
}
}
context.RemoveIndent();
context.Trace("Target item result: {0}", _evaluationValue);
return(_evaluationValue);
}
else
{
context.Trace("Actions or Resources does not Match so Subjects will not be evaluated");
if (resourceEval == TargetEvaluationValue.Indeterminate || actionEval == TargetEvaluationValue.Indeterminate)
{
context.RemoveIndent();
return(TargetEvaluationValue.Indeterminate);
}
else
{
context.RemoveIndent();
return(TargetEvaluationValue.NoMatch);
}
}
}
