| /* |
| * 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.nifi.csv; |
| |
| import org.apache.commons.csv.CSVFormat; |
| import org.apache.commons.csv.CSVParser; |
| import org.apache.commons.csv.CSVRecord; |
| import org.apache.commons.io.input.BOMInputStream; |
| import org.apache.nifi.context.PropertyContext; |
| import org.apache.nifi.processor.exception.ProcessException; |
| import org.apache.nifi.schema.inference.RecordSource; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.InputStreamReader; |
| import java.io.Reader; |
| import java.io.UnsupportedEncodingException; |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.Iterator; |
| import java.util.List; |
| |
| public class CSVRecordSource implements RecordSource<CSVRecordAndFieldNames> { |
| private final Iterator<CSVRecord> csvRecordIterator; |
| private final List<String> fieldNames; |
| |
| public CSVRecordSource(final InputStream in, final PropertyContext context) throws IOException { |
| final String charset = context.getProperty(CSVUtils.CHARSET).getValue(); |
| |
| final Reader reader; |
| try { |
| reader = new InputStreamReader(new BOMInputStream(in), charset); |
| } catch (UnsupportedEncodingException e) { |
| throw new ProcessException(e); |
| } |
| |
| final CSVFormat csvFormat = CSVUtils.createCSVFormat(context).withFirstRecordAsHeader().withTrim(); |
| final CSVParser csvParser = new CSVParser(reader, csvFormat); |
| fieldNames = Collections.unmodifiableList(new ArrayList<>(csvParser.getHeaderMap().keySet())); |
| |
| csvRecordIterator = csvParser.iterator(); |
| } |
| |
| @Override |
| public CSVRecordAndFieldNames next() { |
| if (csvRecordIterator.hasNext()) { |
| final CSVRecord record = csvRecordIterator.next(); |
| return new CSVRecordAndFieldNames(record, fieldNames); |
| } |
| |
| return null; |
| } |
| } |