/// <summary>
/// Retrieving suggestions using the AWS CloudSearch Suggester. The AWS CloudSearch Suggester
/// returns results from the entire index and does not suport query filtering.
/// </summary>
/// <param name="parameters">Suggest request parameters</param>
/// <returns>SuggestResults</returns>
public SuggestResults RetieveSuggestions(NameValueCollection parameters)
{
SuggestResults suggestResults = new SuggestResults();
try
{
AmazonCloudSearchDomainClient client = GetCloudSearchClient();
SuggestRequest request = new SuggestRequest();
if (parameters["suggestername"] != null)
{
request.Suggester = parameters["suggestername"];
}
if (parameters["q"] != null)
{
request.Query = parameters["q"];
}
request.Size = parameters["size"] != null ? Convert.ToInt32(parameters["size"]) : this.DefaultPageSize;
SuggestResponse results = client.Suggest(request);
suggestResults.Matches = results.Suggest.Suggestions.Select(c => c.Suggestion).ToList();
}
catch (Exception ex)
{
suggestResults.HasError = true;
suggestResults.ErrorDetail = ex.Message + " : " + ex.StackTrace;
}
return suggestResults;
}
/// <summary>
/// Retrieving suggestions using a custom implementation. This implementation assumes a 'literal'
/// field type to be used as source for suggestions. This field must have lowercase values.
/// Optionally an alternate display field can be provided which can be used populate the result.
/// This implementation returns similar results as the AWS CloudSearch Suggester when populate the
/// suggest field with the same value field as display field (but in lowercase).
/// </summary>
/// <param name="parameters">Suggest request parameters</param>
/// <param name="suggestFieldName">Name of the suggest field</param>
/// <param name="displayFieldName">Name of the display field</param>
/// <returns>SuggestResults</returns>
public SuggestResults RetieveFilteredSuggestions(NameValueCollection parameters, string suggestFieldName, string displayFieldName = null)
{
SuggestResults suggestResults = new SuggestResults();
try
{
AmazonCloudSearchDomainClient client = GetCloudSearchClient();
SearchRequest request = new SearchRequest();
if (parameters["q"] != null)
{
request.QueryParser = QueryParser.Structured;
request.Query = String.Format("(prefix field={0} '{1}')", suggestFieldName, parameters["q"].ToLower());
}
if (displayFieldName == null)
{
request.Facet = String.Format("{{'{0}':{{'sort':'bucket'}}}}", suggestFieldName);
request.Return = "_no_fields";
}
else
{
request.Return = displayFieldName;
request.Sort = String.Format("{0} asc", displayFieldName);
}
if (!String.IsNullOrEmpty(parameters["fq"]))
{
string filters = string.Empty;
foreach (string filterString in parameters["fq"].Split(','))
{
if (filterString.Contains(":"))
{
filters += (String.Format(" {0}:'{1}'", filterString.Split(':')[0], filterString.Split(':')[1]));
}
}
request.FilterQuery = String.Format("(and{0})", filters);
}
request.Size = parameters["size"] != null ? Convert.ToInt32(parameters["size"]) : this.DefaultPageSize;
SearchResponse response = client.Search(request);
if (displayFieldName == null)
{
if (response.Facets.Count > 0)
{
suggestResults.Matches = response.Facets[suggestFieldName].Buckets.Select(b => b.Value).ToList();
}
}
else
{
if (response.Hits.Hit.Count > 0)
{
suggestResults.Matches = response.Hits.Hit.Select(h => h.Fields[displayFieldName].FirstOrDefault()).ToList();
}
}
}
catch (Exception ex)
{
suggestResults.HasError = true;
suggestResults.ErrorDetail = ex.Message + " : " + ex.StackTrace;
}
return suggestResults;
}