/// <summary>
/// Gets the top tags.
/// </summary>
/// <param name="itemCount">The item count.</param>
/// <returns></returns>
public static IList<Tag> GetTopTags(int itemCount)
{
if (itemCount < 0)
throw new ArgumentNullException("itemCount", "Cannot request negative tags. Pass in 0 to get all tags.");
IDictionary<string, int> topTags = ObjectProvider.Instance().GetTopTags(itemCount);
double mean;
double stdDev = Statistics.StdDev(topTags.Values, out mean);
IList<Tag> tags = new List<Tag>();
foreach (KeyValuePair<string, int> tag in topTags)
{
Tag t = new Tag(tag);
t.Factor = (t.Count - mean) / stdDev;
t.Weight = ComputeWeight(t.Factor, stdDev);
tags.Add(t);
}
return tags;
}
/// <summary>
/// Gets the top tags.
/// </summary>
public static ICollection<Tag> GetMostUsedTags(this ObjectProvider repository, int itemCount)
{
if(itemCount < 0)
{
throw new ArgumentOutOfRangeException("itemCount", itemCount,
Resources.ArgumentOutOfRange_NegativeTagItemCount);
}
var topTags = repository.GetTopTags(itemCount);
double mean;
double stdDev = topTags.Values.StandardDeviation(out mean);
var tags = new List<Tag>();
foreach(var tag in topTags)
{
var t = new Tag(tag);
t.Factor = (t.Count - mean) / stdDev;
t.Weight = ComputeWeight(t.Factor, stdDev);
tags.Add(t);
}
return tags;
}
public void CanSetAndGetSimpleProperties()
{
Tag tag = new Tag(new KeyValuePair<string,int>());
UnitTestHelper.AssertSimpleProperties(tag);
}
public void GetTopTags_WithTagsInCache_RetrievesFromCache()
{
// arrange
var tag = new Tag(new KeyValuePair<string, int>("Test", 123));
var context = new Mock<ISubtextContext>();
context.Setup(c => c.Blog).Returns(new Blog { Id = 1001 });
context.Setup(c => c.Cache["TagsCount10BlogId1001"]).Returns(new[] { tag });
context.Setup(c => c.Repository.GetTopTags(10)).Throws(new Exception("Repository should not have been accessed"));
// act
var cachedTags = Cacher.GetTopTags(10, context.Object);
// assert
Assert.AreEqual(tag, cachedTags.First());
}
