/*
* 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.atlas.csv ;
import java.io.IOException ;
import java.io.InputStream ;
import java.io.Reader ;
import java.util.Iterator ;
import java.util.List ;
import java.util.function.Function;
import org.apache.commons.csv.CSVFormat ;
import org.apache.commons.csv.CSVRecord ;
import org.apache.jena.atlas.io.IO ;
import org.apache.jena.atlas.iterator.Iter ;
/**
* Wrapper for Commons CSV parser.
*/
public class CSVParser implements Iterable<List<String>>
{
private final org.apache.commons.csv.CSVParser parser;
private final Iterator<CSVRecord> iterator ;
public static CSVParser create(String filename) {
InputStream input = IO.openFile(filename) ;
return create(input) ;
}
public static CSVParser create(InputStream input) {
CSVParser parser = new CSVParser(IO.asBufferedUTF8(input)) ;
return parser ;
}
/** Be careful about charsets */
public static CSVParser create(Reader input) {
CSVParser parser = new CSVParser(input) ;
return parser ;
}
private CSVParser(Reader input) {
try {
this.parser = CSVFormat.RFC4180.parse(input);
this.iterator = parser.iterator() ;
} catch (IOException e) {
throw new CSVParseException("Failed to create the CSV parser: " + e.getMessage(), e);
}
}
private static Function<CSVRecord, List<String>> transform = rec -> recordToList(rec) ;
@Override
public Iterator<List<String>> iterator() {
return Iter.map(iterator, transform) ;
}
public List<String> parse1() {
if (iterator.hasNext())
return recordToList(iterator.next()) ;
return null;
}
private static List<String> recordToList(CSVRecord record) {
return Iter.toList(record.iterator()) ;
}
}