/// <summary>
/// Geography Information Retrieval (WHAT - REL - WHERE)
/// Analyze input query to 3 different phases of What - Relation - Where
/// </summary>
/// <param name="inputQuery">inputQuery</param>
public async Task GIRQueryAnalyzerAsync(string inputQuery)
{
string what = string.Empty; // What phrase
string tempWhat = string.Empty; // Temporary value for What phrase
string relation = string.Empty; // Relation word
string tempRelation = string.Empty; // Temporary value for Relation word
string where = string.Empty; // Where phrase
string tempWhere = string.Empty; // Temporary value for Where phrase
bool isComplete = false; // Indicate if the process is complete or not
// Remove redundant white space between words in inputquery
inputQuery = Regex.Replace(inputQuery, @"\s+", " ");
// Create a list of tokens
List <string> tokens = StringUtil.StringTokenizer(inputQuery);
int sizeOfTokens = tokens.Count();
// Load relation word dictionary
List <string> wordDic = await DictionaryUtil.LoadRelationWordAsync();
// Load list of cities
List <City> cityList = await LocationUtil.LoadCityAsync();
// Load list of districts
List <District> districtList = await LocationUtil.LoadAllDistrictAsync();
// Check if the lists are load successfully
if ((wordDic == null) &&
(cityList == null) &&
(districtList == null))
{
return;
}
what = StringUtil.ConcatTokens(tokens, 0, sizeOfTokens - 1);
// Check every token in the list
for (int n = 0; n < sizeOfTokens; n++)
{
for (int i = n; i < sizeOfTokens; i++)
{
// Concate tokens to create a string with the original starting
// word is the first token, and this word is shift to left one index every n loop
// if relaton word is not found.
// New tokens is add to original token every i loop to check for valid relation word
tempRelation = StringUtil.ConcatTokens(tokens, n, i);
// Check if token string is matched with relation word in database
if (IsValidRelationWord(tempRelation, wordDic))
{
// If it matches, assign temporary What phrase value with
// the value of leading words before Relation word
tempWhat = inputQuery.Substring(0, inputQuery.IndexOf(tempRelation) - 1);
// Assign Where phrase value with the value of trailing
// words after Relation word
where = StringUtil.ConcatTokens(tokens, i + 1, sizeOfTokens - 1).Trim().ToLower();
// Check if Where phrase is matched with locaitons in database
// and handle Where phrase to locate exactly search locations
if (IsValidWherePhrase(where, cityList, districtList))
{
// Change status of isComplete varialbe
isComplete = true;
// If matches, assign Relation word is with the value
// of temporary relation
relation = tempRelation;
// Assign n value again to break the outside loop
n = sizeOfTokens;
break;
}
// Assign Relation word with the value of temporary relation
// every i loop
relation = tempRelation;
}
}
}
// Check if the process is completely finished
if (!isComplete)
{
// Handle query in case of input string is not well-formed
// with Relation word and Where phrase is not found.
// Auto check Where phrase with the first location value in input query,
// if Where phrase is valid, auto assign Relation word with default value.
if (string.IsNullOrEmpty(relation) && string.IsNullOrEmpty(where))
{
int i = 0;
// Take first location in input query string
// and handle Where phrase (if any) to locate exactly search locations
string firstLocation = TakeFirstLocationInQueryString(inputQuery, cityList, districtList);
if (!string.IsNullOrEmpty(firstLocation))
{
i = inputQuery.IndexOf(firstLocation.ToLower());
tempWhat = inputQuery.Substring(0, i);
if (string.IsNullOrEmpty(tempWhat))
{
where = firstLocation;
if (firstLocation.Length != inputQuery.Length)
{
tempWhat = inputQuery.Substring(firstLocation.Length).Trim().ToLower();
}
}
else
{
where = inputQuery.Substring(i).Trim().ToLower();
}
}
else
{
tempWhat = what;
relation = string.Empty;
where = string.Empty;
}
}
}
// Make sure What phrase have the value.
// At the worst case if the input query is not well-formed,
// assign What phrase with the input query
if (!string.IsNullOrEmpty(tempWhat))
{
what = tempWhat.Trim().ToLower();
}
// Check if What phrase is equal to Where phrase
if (what.Equals(where))
{
what = string.Empty;
}
string a = string.Format("[{0}][{1}][{2}]", what, relation, where);
int hospitalId = this.HospitalID;
string hospitalName = this.HospitalName;
int cityId = this.CityID;
string cityName = this.CityName;
int districtId = this.DistrictID;
string districtName = this.DistrictName;
int specialityId = this.SpecialityID;
string speacialityName = this.SpecialityName;
int diseaseId = this.DiseaseID;
string diseaseName = this.DiseaseName;
this.WhatPhrase = what;
}