Module io.jenetics.ext

Package io.jenetics.ext.util

Class CsvSupport.LineReader

java.lang.Object

io.jenetics.ext.util.CsvSupport.LineReader

Enclosing class:

CsvSupport

public static final class CsvSupport.LineReader
extends Object

This class reads CSV files and splits it into lines. It takes a quote character as a parameter, which is necessary for not splitting on quoted line feeds.

final var csv = """
    0.0,0.0000
    0.1,0.0740
    0.2,0.1120
    0.3,0.1380
    0.4,0.1760
    0.5,0.2500
    0.6,0.3840
    0.7,0.6020
    0.8,0.9280
    0.9,1.3860
    1.0,2.0000
    """;

final var reader = new LineReader(new Quote('"'));
try (Stream<String> lines = reader.read(new StringReader(csv))) {
    lines.forEach(System.out::println);
}

Since:

8.1

Version:

8.1

API Note:

This reader obeys escaped line breaks according RFC-4180.

Constructor Summary

Constructors

Constructor	Description
LineReader()	Create a new line reader with default quote character '"' (CsvSupport.Quote.DEFAULT).
LineReader(CsvSupport.Quote quote)	Create a new line-reader with the given quote character, which is used in the CSV file which is read.

Method Summary

Modifier and Type	Method	Description
Stream<String>	read(Reader reader)	Reads all CSV lines from the given reader.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

LineReader

public LineReader(CsvSupport.Quote quote)

Create a new line-reader with the given quote character, which is used in the CSV file which is read.

Parameters:

quote - the quoting character

Throws:

NullPointerException - if the quote character is null

LineReader

public LineReader()

Create a new line reader with default quote character '"' (CsvSupport.Quote.DEFAULT).

Method Details

read

public Stream<String> read(Reader reader)

Reads all CSV lines from the given reader.

Parameters:

reader - the reader from which to read the CSV content

Returns:

the CSV lines from the file as a Stream

API Note:

This method must be used within a try-with-resources statement or similar control structure to ensure that the stream's open file is closed promptly after the stream's operations have completed.