uk.ac.starlink.ecsv

Class EcsvEncoder

java.lang.Object

uk.ac.starlink.ecsv.EcsvEncoder

public abstract class EcsvEncoder
extends Object

Converts values for a given column into strings suitable for inclusion in the body of an ECSV file.

Since:

28 Apr 2020

Author:

Mark Taylor

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	EcsvEncoder(String datatype, String subtype) Constructor.

Method Summary

Modifier and Type	Method and Description
static EcsvEncoder	createEncoder(ColumnInfo info, char delimiter) Returns an encoder suitable for encoding data from a column with given metadata.
abstract String	encode(Object value) Formats a value of this encoder's datatype for insertion into the body of an ECSV file.
String	getDatatype() Returns the ECSV datatype handled by this encoder.
String	getSubtype() Returns the ECSV subtype for this decoder.
static String	quoteString(String txt, char delimiter) Returns a suitably escaped value of a string, ensuring that no ECSV control characters are present in the result.

Methods inherited from class java.lang.Object

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

Constructor Detail

EcsvEncoder

protected EcsvEncoder(String datatype,
                      String subtype)

Constructor.

Parameters:

datatype - datatype name as declared by ECSV

subtype - subtype string as declared by ECSV, may be null

Method Detail

encode

public abstract String encode(Object value)

Formats a value of this encoder's datatype for insertion into the body of an ECSV file. The output string must include any required quoting, for instance it may not include unescaped delimiters, newlines or double quote characters. As a special case, null may be returned instead if no conversion can be performed.

Parameters:

value - typed value to encode

Returns:

formatted string representation, or null

getDatatype

public String getDatatype()

Returns the ECSV datatype handled by this encoder.

Returns:

datatype string

getSubtype

public String getSubtype()

Returns the ECSV subtype for this decoder.

Returns:

subtype, may be null

createEncoder

public static EcsvEncoder createEncoder(ColumnInfo info,
                                        char delimiter)

Returns an encoder suitable for encoding data from a column with given metadata.

Parameters:

info - column metadata

delimiter - delimiter value, must be comma or space, required to determine quoting details

Returns:

encoder, or null for unknown or unsupported data type

quoteString

public static String quoteString(String txt,
                                 char delimiter)

Returns a suitably escaped value of a string, ensuring that no ECSV control characters are present in the result.

Parameters:

txt - raw string

delimiter - delimiter character to be avoided, must be comma or space

Returns:

sanitised version of the string