public static MoreLikeThisQueryParameters GetParametersFromPath(string path, NameValueCollection query)
{
var results = new MoreLikeThisQueryParameters
{
IndexName = query.Get("index"),
Fields = query.GetValues("fields"),
Boost = query.Get("boost").ToNullableBool(),
MaximumNumberOfTokensParsed = query.Get("maxNumTokens").ToNullableInt(),
MaximumQueryTerms = query.Get("maxQueryTerms").ToNullableInt(),
MaximumWordLength = query.Get("maxWordLen").ToNullableInt(),
MinimumDocumentFrequency = query.Get("minDocFreq").ToNullableInt(),
MinimumTermFrequency = query.Get("minTermFreq").ToNullableInt(),
MinimumWordLength = query.Get("minWordLen").ToNullableInt(),
StopWordsDocumentId = query.Get("stopWords"),
};
var keyValues = query.Get("docid").Split(new[] { ';' }, StringSplitOptions.RemoveEmptyEntries);
foreach (var keyValue in keyValues)
{
var split = keyValue.IndexOf('=');
if (split >= 0)
{
results.MapGroupFields.Add(keyValue.Substring(0, split), keyValue.Substring(split + 1));
}
else
{
results.DocumentId = keyValue;
}
}
return(results);
}
public void Can_encode_decode_request_by_documentId()
{
var parameters = new MoreLikeThisQueryParameters();
parameters.IndexName = "dataIndex";
parameters.DocumentId = "foo/1";
parameters.Fields = new[] { "Body" };
parameters.MinimumWordLength = 3;
parameters.MinimumDocumentFrequency = 1;
parameters.Boost = true;
var uri = parameters.GetRequestUri(parameters.IndexName);
Assert.Equal("/morelikethis/?index=dataIndex&docid=foo%2F1&fields=Body&boost=true&minDocFreq=1&minWordLen=3&", uri);
var path = uri.Substring(0, uri.IndexOf('?'));
var queryString = HttpUtility.ParseQueryString(uri.Substring(uri.IndexOf('?')));
var decodedParameters = MoreLikeThisQueryParameters.GetParametersFromPath(path, queryString);
Assert.Equal("dataIndex", decodedParameters.IndexName);
Assert.Equal(JsonConvert.SerializeObject(parameters), JsonConvert.SerializeObject(decodedParameters));
}
public static MoreLikeThisQueryParameters GetParametersFromPath(string path, NameValueCollection query)
{
var results = new MoreLikeThisQueryParameters
{
IndexName = query.Get("index"),
Fields = query.GetValues("fields"),
Boost = query.Get("boost").ToNullableBool(),
MaximumNumberOfTokensParsed = query.Get("maxNumTokens").ToNullableInt(),
MaximumQueryTerms = query.Get("maxQueryTerms").ToNullableInt(),
MaximumWordLength = query.Get("maxWordLen").ToNullableInt(),
MinimumDocumentFrequency = query.Get("minDocFreq").ToNullableInt(),
MinimumTermFrequency = query.Get("minTermFreq").ToNullableInt(),
MinimumWordLength = query.Get("minWordLen").ToNullableInt(),
StopWordsDocumentId = query.Get("stopWords"),
};
var keyValues = query.Get("docid").Split(new[] { ';' }, StringSplitOptions.RemoveEmptyEntries);
foreach(var keyValue in keyValues)
{
var split = keyValue.IndexOf('=');
if (split >= 0)
{
results.MapGroupFields.Add(keyValue.Substring(0, split), keyValue.Substring(split+1));
}
else
{
results.DocumentId = keyValue;
}
}
return results;
}
private void PerformSearch(IHttpContext context, string indexName, Index index, MoreLikeThisQueryParameters parameters)
{
IndexSearcher searcher;
using (Database.IndexStorage.GetCurrentIndexSearcher(indexName, out searcher))
{
var documentQuery = new BooleanQuery();
if (!string.IsNullOrEmpty(parameters.DocumentId))
{
documentQuery.Add(new TermQuery(new Term(Constants.DocumentIdFieldName, parameters.DocumentId.ToLowerInvariant())),
Occur.MUST);
}
foreach (string key in parameters.MapGroupFields.Keys)
{
documentQuery.Add(new TermQuery(new Term(key, parameters.MapGroupFields[key])),
Occur.MUST);
}
var td = searcher.Search(documentQuery, 1);
// get the current Lucene docid for the given RavenDB doc ID
if (td.ScoreDocs.Length == 0)
{
context.SetStatusToNotFound();
context.WriteJson(new { Error = "Document " + parameters.DocumentId + " could not be found" });
return;
}
var ir = searcher.IndexReader;
var mlt = new RavenMoreLikeThis(ir);
AssignParameters(mlt, parameters);
if (!string.IsNullOrWhiteSpace(parameters.StopWordsDocumentId))
{
var stopWordsDoc = Database.Get(parameters.StopWordsDocumentId, null);
if (stopWordsDoc == null)
{
context.SetStatusToNotFound();
context.WriteJson(
new
{
Error = "Stop words document " + parameters.StopWordsDocumentId + " could not be found"
});
return;
}
var stopWordsSetup = stopWordsDoc.DataAsJson.JsonDeserialization<StopWordsSetup>();
if(stopWordsSetup.StopWords != null)
{
var stopWords = stopWordsSetup.StopWords;
var ht = new Hashtable(StringComparer.InvariantCultureIgnoreCase);
foreach (var stopWord in stopWords)
{
ht[stopWord] = stopWord;
}
mlt.SetStopWords(ht);
}
}
var fieldNames = parameters.Fields ?? GetFieldNames(ir);
mlt.SetFieldNames(fieldNames);
var toDispose = new List<Action>();
PerFieldAnalyzerWrapper perFieldAnalyzerWrapper = null;
try
{
perFieldAnalyzerWrapper = index.CreateAnalyzer(new LowerCaseKeywordAnalyzer(), toDispose, true);
mlt.SetAnalyzer(perFieldAnalyzerWrapper);
var mltQuery = mlt.Like(td.ScoreDocs[0].Doc);
var tsdc = TopScoreDocCollector.Create(context.GetPageSize(Database.Configuration.MaxPageSize), true);
searcher.Search(mltQuery, tsdc);
var hits = tsdc.TopDocs().ScoreDocs;
var jsonDocuments = GetJsonDocuments(parameters, searcher, index, indexName, hits, td.ScoreDocs[0].Doc);
var result = new MultiLoadResult();
var includedEtags = new List<byte>(jsonDocuments.SelectMany(x => x.Etag.Value.ToByteArray()));
includedEtags.AddRange(Database.GetIndexEtag(indexName, null).ToByteArray());
var loadedIds = new HashSet<string>(jsonDocuments.Select(x => x.Key));
var addIncludesCommand = new AddIncludesCommand(Database, GetRequestTransaction(context), (etag, includedDoc) =>
{
includedEtags.AddRange(etag.ToByteArray());
result.Includes.Add(includedDoc);
}, context.Request.QueryString.GetValues("include") ?? new string[0], loadedIds);
foreach (var jsonDocumet in jsonDocuments)
{
result.Results.Add(jsonDocumet.ToJson());
addIncludesCommand.Execute(jsonDocumet.DataAsJson);
}
Guid computedEtag;
using (var md5 = MD5.Create())
{
var computeHash = md5.ComputeHash(includedEtags.ToArray());
computedEtag = new Guid(computeHash);
}
if (context.MatchEtag(computedEtag))
{
context.SetStatusToNotModified();
return;
}
context.Response.AddHeader("ETag", computedEtag.ToString());
context.WriteJson(result);
}
finally
{
if (perFieldAnalyzerWrapper != null)
perFieldAnalyzerWrapper.Close();
foreach (var action in toDispose)
{
action();
}
}
}
}
private static void AssignParameters(Similarity.Net.MoreLikeThis mlt, MoreLikeThisQueryParameters parameters)
{
if (parameters.Boost != null) mlt.SetBoost(parameters.Boost.Value);
if (parameters.MaximumNumberOfTokensParsed != null)
mlt.SetMaxNumTokensParsed(parameters.MaximumNumberOfTokensParsed.Value);
if (parameters.MaximumNumberOfTokensParsed != null) mlt.SetMaxNumTokensParsed(parameters.MaximumNumberOfTokensParsed.Value);
if (parameters.MaximumQueryTerms != null) mlt.SetMaxQueryTerms(parameters.MaximumQueryTerms.Value);
if (parameters.MaximumWordLength != null) mlt.SetMaxWordLen(parameters.MaximumWordLength.Value);
if (parameters.MinimumDocumentFrequency != null) mlt.SetMinDocFreq(parameters.MinimumDocumentFrequency.Value);
if (parameters.MinimumTermFrequency != null) mlt.SetMinTermFreq(parameters.MinimumTermFrequency.Value);
if (parameters.MinimumWordLength != null) mlt.SetMinWordLen(parameters.MinimumWordLength.Value);
}
private IEnumerable<JsonDocument> GetJsonDocuments(
MoreLikeThisQueryParameters parameters, IndexSearcher searcher, Index index,
string indexName, IEnumerable<ScoreDoc> hits, int baseDocId)
{
if (string.IsNullOrEmpty(parameters.DocumentId) == false)
{
var documentIds = hits
.Where(hit => hit.Doc != baseDocId)
.Select(hit => searcher.Doc(hit.Doc).Get(Constants.DocumentIdFieldName))
.Where(x => x != null)
.Distinct();
return documentIds
.Select(docId => Database.Get(docId, null))
.Where(it => it != null)
.ToArray();
}
var fields = searcher.Doc(baseDocId).GetFields().Cast<AbstractField>().Select(x => x.Name).Distinct().ToArray();
var etag = Database.GetIndexEtag(indexName, null);
return hits
.Where(hit => hit.Doc != baseDocId)
.Select(hit => new JsonDocument
{
DataAsJson = Index.CreateDocumentFromFields(searcher.Doc(hit.Doc), new FieldsToFetch(fields, AggregationOperation.None,
index.IsMapReduce ? Constants.ReduceKeyFieldName : Constants.DocumentIdFieldName)),
Etag = etag
})
.ToArray();
}
