//public LuceneIndexTransform()
//{
//}
public void Transform(string inputPath, string outputPath, Dictionary <string, string> fieldNameTransformDictionary,
Dictionary <string, Func <string, string> > fieldValueTransformDictionary = null, Func <Document, bool> documentPredicate = null)
{
if (fieldValueTransformDictionary == null)
{
fieldValueTransformDictionary = new Dictionary <string, Func <string, string> >();
}
if (documentPredicate == null)
{
documentPredicate = document => true;
}
Func <string, string> defaultValueTransformFunc = str => str;
LuceneOperations.EnumerateIndexReaderWriter(inputPath, outputPath, (inDoc, indexWriter) =>
{
if (documentPredicate(inDoc))
{
var outDoc = new Document();
foreach (var kvp in fieldNameTransformDictionary)
{
var inFieldName = kvp.Key;
var inValue = inDoc.Get(inFieldName);
if (inValue != null)
{
var outFieldName = kvp.Value;
Func <string, string> valueTransformFunc;
if (!fieldValueTransformDictionary.TryGetValue(inFieldName, out valueTransformFunc))
{
valueTransformFunc = defaultValueTransformFunc;
}
LuceneOperations.AddField(outDoc, outFieldName, valueTransformFunc(inValue));
}
}
indexWriter.AddDocument(outDoc);
}
});
}
