/// <summary>
/// OBS this implementation can only provide values for properties of type <seealso cref="string"/>.
/// Other property types will still be counted as distinct, but {@code client} won't receive <seealso cref="Value"/>
/// instances for those. </summary>
/// <param name="client"> <seealso cref="IndexProgressor.NodeValueClient"/> to get initialized with this progression. </param>
/// <param name="propertyAccessor"> <seealso cref="NodePropertyAccessor"/> for reading property values. </param>
/// <param name="needsValues"> whether or not to load string values. </param>
public override void DistinctValues(Org.Neo4j.Storageengine.Api.schema.IndexProgressor_NodeValueClient client, NodePropertyAccessor propertyAccessor, bool needsValues)
{
try
{
IndexQuery[] noQueries = new IndexQuery[0];
BridgingIndexProgressor multiProgressor = new BridgingIndexProgressor(client, _descriptor.schema().PropertyIds);
Fields fields = MultiFields.getFields(IndexSearcher.IndexReader);
foreach (ValueEncoding valueEncoding in ValueEncoding.values())
{
Terms terms = fields.terms(valueEncoding.key());
if (terms != null)
{
System.Func <BytesRef, Value> valueMaterializer = valueEncoding == ValueEncoding.String && needsValues ? term => Values.stringValue(term.utf8ToString()) : term => null;
TermsEnum termsIterator = terms.GetEnumerator();
if (valueEncoding == ValueEncoding.Number)
{
termsIterator = NumericUtils.filterPrefixCodedLongs(termsIterator);
}
multiProgressor.Initialize(_descriptor, new LuceneDistinctValuesProgressor(termsIterator, client, valueMaterializer), noQueries, IndexOrder.NONE, needsValues);
}
}
client.Initialize(_descriptor, multiProgressor, noQueries, IndexOrder.NONE, needsValues);
}
catch (IOException e)
{
throw new UncheckedIOException(e);
}
}
internal virtual Field GetFieldWithValue(int propertyNumber, Value value)
{
ValueEncoding encoding = ValueEncoding.forValue(value);
int reuseId = propertyNumber * ValueEncoding.values().length + encoding.ordinal();
string key = encoding.key(propertyNumber);
Field reusableField = ReusableValueFields[reuseId];
if (reusableField == null)
{
reusableField = encoding.encodeField(key, value);
ReusableValueFields[reuseId] = reusableField;
}
else
{
encoding.setFieldValue(value, reusableField);
}
return(reusableField);
}