CODEWITHSUNDEEP
javafileelki
Valeriy K.
Valeriy K.

Reputation: 2906

ELKI: How to create Database from several files in java

I try to get data from several csv files. I use ConcatenateFilesDatabaseConnection for db

Database getDbFromFiles(List<File> files) {
    ListParameterization params = new ListParameterization();
    params.addParameter(ConcatenateFilesDatabaseConnection.Parameterizer.PARSER_ID, files);
    Database db = ClassGenericsUtil.parameterizeOrAbort(StaticArrayDatabase.class, params);
return db;
    }

like for FileBasedDatabaseConnection

ListParameterization params = new ListParameterization();
params.addParameter(FileBasedDatabaseConnection.Parameterizer.INPUT_ID, filename);
Database db = ClassGenericsUtil.parameterizeOrAbort(StaticArrayDatabase.class, params);

but when i run i get error

de.lmu.ifi.dbs.elki.utilities.optionhandling.UnspecifiedParameterException: No value given for parameter "dbc.in": Expected: The name of the input file to be parsed. de.lmu.ifi.dbs.elki.utilities.optionhandling.WrongParameterValueException: Wrong value of parameter dbc.parser. Read: [src\main\resources\data1.csv, src\main\resources\data2.csv, src\main\resources\data3.csv]. Expected: Parser to provide the database. Implementing de.lmu.ifi.dbs.elki.datasource.parser.Parser

Maybe someone worked with several files on ELKI and knew how to do it right. I did not find the code to handle multiple files in ELKI

Upvotes: 0

Views: 146

Answers (1)

Erich Schubert
Erich Schubert

Reputation: 8715

You set the parser to a List<File>. That cannot work.

A parser is a program routine that interprets the input of some (text) data stream.

You need to set the right parameter (the input file name, not the parser).

https://github.com/elki-project/elki/blob/709dbfa01b40ad023885b0745bad2f26184a4ac7/elki-input/src/main/java/de/lmu/ifi/dbs/elki/datasource/ConcatenateFilesDatabaseConnection.java#L164

Upvotes: 1

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