public double Compute(ValueExpression expression, string path)
{
path = PathUtils.NormalizePath(path);
var statistics = _statistics.GetStatistics(path);
if (statistics == null)
{
return(0);
}
// find which subsets of attributes match this expression
long sum = 0;
long totalSum = 0;
var visitor = new PriorityVisitor(statistics.AttributeSubsets, _metadataAttributes);
var result = expression.Accept(visitor);
// count the files which contain these subsets
for (var i = 0; i < result.Count; ++i)
{
if (result[i])
{
sum += statistics.GetSubsetCount(i);
}
totalSum += statistics.GetSubsetCount(i);
}
Trace.Assert(sum <= totalSum);
// compute the probability
return(sum / (double)totalSum);
}
public void VisitValue()
{
var valueExpr =
new ValueExpression(
new FuzzyVariable("MyFuzzyVariable", new NumericVariable("MyNumVariable")),
new FuzzyTerm("MyTerm", new MembershipFunction()));
var sut = new ToStringVisitor();
var result = sut.Visit(valueExpr);
Assert.AreEqual("MyFuzzyVariable=MyTerm", result);
result = valueExpr.Accept(sut);
Assert.AreEqual("MyFuzzyVariable=MyTerm", result);
}
public void VisitValue()
{
var variable = new FuzzyVariable("MyFuzzyVariable", new NumericVariable("MyNumVariable"));
var valueExpr =
new ValueExpression(
variable,
new FuzzyTerm("MyTerm", new MembershipFunction()));
var sut = new GetInvolvedVariables();
var result = sut.Visit(valueExpr);
Assert.AreEqual(1, result.Count);
Assert.AreEqual(variable, result[0]);
result = valueExpr.Accept(sut);
Assert.AreEqual(1, result.Count);
Assert.AreEqual(variable, result[0]);
}
public void Accept()
{
var term = new FuzzyTerm("Term", new MembershipFunction());
var var = new FuzzyVariable("Variable", null, term);
var mocks = new MockRepository();
var visitor = mocks.StrictMock<IExpressionVisitor<int>>();
var sut = new ValueExpression(var, term);
Expect.Call(visitor.Visit(sut)).Return(42);
mocks.ReplayAll();
var result = sut.Accept(visitor);
Assert.AreEqual(42, result);
mocks.VerifyAll();
}
public AccessedAttributesVisitor(ValueExpression expr)
{
expr.Accept(this);
}