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jena-csv is for getting CSVs into a form that is amenable to Jena SPARQL processing, and doing so in a way that is not specific to CSV files. It includes getting the right architecture in place for regular table shaped data, using the core abstraction of PropertyTable.

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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.jena.propertytable.lang;

import static org.apache.jena.riot.RDFLanguages.CSV ;

import java.io.InputStream ;
import java.io.Reader ;

import org.apache.jena.atlas.web.ContentType ;
import org.apache.jena.riot.Lang ;
import org.apache.jena.riot.ReaderRIOT ;
import org.apache.jena.riot.lang.LangRIOT ;
import org.apache.jena.riot.system.ErrorHandler ;
import org.apache.jena.riot.system.ErrorHandlerFactory ;
import org.apache.jena.riot.system.ParserProfile ;
import org.apache.jena.riot.system.StreamRDF ;
import org.apache.jena.sparql.util.Context ;

class ReaderRIOTLangCSV implements ReaderRIOT
{
    private final Lang lang ;
    private ErrorHandler errorHandler ; 
    private ParserProfile parserProfile = null ;

    ReaderRIOTLangCSV(Lang lang) {
        this.lang = lang ;
        errorHandler = ErrorHandlerFactory.getDefaultErrorHandler() ;
    }

    @Override
    public void read(InputStream in, String baseURI, ContentType ct, StreamRDF output, Context context) {
        if ( lang != CSV)
            throw new IllegalArgumentException("The Lang must be 'CSV'!");
        LangRIOT parser = new LangCSV (in, baseURI, baseURI, ErrorHandlerFactory.getDefaultErrorHandler(),  output);
        if ( parserProfile != null )
            parser.setProfile(parserProfile);
        if ( errorHandler != null )
            parser.getProfile().setHandler(errorHandler) ;
        parser.parse() ;
    }

    @Override
    public void read(Reader in, String baseURI, ContentType ct, StreamRDF output, Context context) {
    	if ( lang != CSV)
    	    throw new IllegalArgumentException("The Lang must be 'CSV'!");
    	LangRIOT parser = new LangCSV (in, baseURI, baseURI, ErrorHandlerFactory.getDefaultErrorHandler(),  output);
        if ( parserProfile != null )
            parser.setProfile(parserProfile);
        if ( errorHandler != null )
            parser.getProfile().setHandler(errorHandler) ;
        parser.parse() ;
    }

    @Override public ErrorHandler getErrorHandler()                     { return errorHandler ; }
    @Override public void setErrorHandler(ErrorHandler errorHandler)    { this.errorHandler = errorHandler ; }

    @Override public ParserProfile getParserProfile()                   { return parserProfile ; } 
    @Override public void setParserProfile(ParserProfile parserProfile) { this.parserProfile = parserProfile ; }
}