/// <summary>
/// Print out the word occurences.
/// </summary>
/// <param name="freq"></param>
private static void Print(OccurenceInfo freq)
{
Console.Write(freq.Occurence+" occurence(s): ");
string printStr = String.Empty; //used to avoid redundant last comma
foreach (string word in freq)
{
if (!String.IsNullOrEmpty(printStr))
{
Console.Write(printStr + ", ");
}
printStr = word;
}
Console.WriteLine(printStr);
}
/// <summary>
/// Use the word frequency as an index into an array where each entry in the
/// array contains the word(s) with that frequency.
/// </summary>
/// <returns></returns>
private OccurenceInfo[] BuildFrequencyArray()
{
OccurenceInfo[] result = new OccurenceInfo[maxWordCount + 1];
foreach (string word in wordCount.Keys)
{
int frequency = wordCount[word];
if (result[frequency] == null)
{
result[frequency] = new OccurenceInfo(frequency);
}
result[frequency].Add(word);
}
return result;
}
/// <summary>
/// Compare a single frequencyInfo object to the original test data.
/// </summary>
/// <param name="frequencyInfo"></param>
/// <param name="testData"></param>
private void TestResult(OccurenceInfo frequencyInfo, TestData testData)
{
Assert.AreEqual(frequencyInfo.Words.Count, testData.words.Length);
for (int i = 0; i < testData.words.Length; i++)
{
Assert.IsTrue(frequencyInfo.Words.Contains(testData.words[i]));
}
}
/// <summary>
/// Traverse frequency array from the back to get n most frequency words.
/// </summary>
/// <param name="frequencyArray"></param>
/// <param name="n"></param>
/// <returns></returns>
private WordOccurences GetTopNWords(OccurenceInfo[] frequencyArray, int n)
{
WordOccurences result = new WordOccurences();
//have to filter out null array entries
int len = frequencyArray.Length;
int index = 0;
int count = 0;
while (count < n)
{
OccurenceInfo fi = frequencyArray[len - index - 1]; //start at the back of the array
if (fi != null)
{
result.Add(fi);
count++;
}
index++;
}
return result;
}
