/// <summary>
/// Converts a <see cref="Document" /> object to a <see cref="LuceneDocument" /> object.
/// </summary>
/// <param name="document">The Document object</param>
/// <param name="schema">The schema.</param>
/// <param name="facetBuilder">The Lucene facet builder.</param>
/// <returns></returns>
/// <exception cref="ArgumentNullException"></exception>
/// <exception cref="InvalidOperationException">Cannot index a Document that does not have an _id.</exception>
/// <exception cref="SchemaException">The fieldName '{fieldName}'</exception>
/// <exception cref="System.ArgumentNullException"></exception>
/// <exception cref="System.InvalidOperationException">Cannot index a Document that does not have an _id.</exception>
public static LuceneDocument ToLuceneDocument(this Document document, Schema schema = null, LuceneFacetBuilder facetBuilder = null)
{
if (document == null)
throw new ArgumentNullException(nameof(document));
if (schema == null)
schema = Schema.CreateDefault();
var documentDictionary = document.AsDictionary();
if (!documentDictionary.ContainsKey(Schema.StandardField.ID))
throw new InvalidOperationException("Cannot index a Document that does not have an _id.");
var luceneDocument = new LuceneDocument();
// Make sure the _id field is the first field added to the Lucene document
var keys = documentDictionary.Keys.Except(new[] { Schema.StandardField.ID }).ToList();
keys.Insert(0, Schema.StandardField.ID);
foreach (var fieldName in keys)
{
// Validate fieldName - must not contain space or Lucene QueryParser illegal characters.
if (_queryParserIllegalCharsRegex.IsMatch(fieldName))
throw new SchemaException($"The fieldName '{fieldName}' contains illegal characters.");
Schema.Field schemaField = null;
if (!schema.Fields.TryGetValue(fieldName, out schemaField))
{
schemaField = new Schema.Field
{
Name = fieldName
};
schema.Fields.TryAdd(fieldName, schemaField);
}
var fieldValue = documentDictionary[fieldName];
var luceneFields = fieldValue.ToLuceneFields(schemaField);
foreach (var luceneField in luceneFields)
luceneDocument.Add(luceneField);
}
// The full-text field is always auto-generated and added to the Lucene document.
var fullText = document.ToLuceneFullTextString();
luceneDocument.Add(new TextField(Schema.StandardField.FULL_TEXT, fullText, FieldStore.NO));
// Check if the document has the special _categories field,
// which means that we need to create facets for it.
if (document.HasCategories() && facetBuilder != null)
luceneDocument = facetBuilder.RebuildDocumentWithFacets(luceneDocument, document, schema);
return luceneDocument;
}
