org.apache.kafka.connect.storage

Class StringConverter

java.lang.Object

org.apache.kafka.connect.storage.StringConverter

All Implemented Interfaces:

Closeable, AutoCloseable, Configurable, Converter, HeaderConverter

public class StringConverter
extends Object
implements Converter, HeaderConverter

Converter and HeaderConverter implementation that only supports serializing to strings. When converting Kafka Connect data to bytes, the schema will be ignored and Object.toString() will always be invoked to convert the data to a String. When converting from bytes to Kafka Connect format, the converter will only ever return an optional string schema and a string or null. Encoding configuration is identical to StringSerializer and StringDeserializer, but for convenience this class can also be configured to use the same encoding for both encoding and decoding with the converter.encoding setting. This implementation currently does nothing with the topic names or header names.

Constructor Summary

Constructors

Constructor and Description
StringConverter()

Method Summary

Modifier and Type	Method and Description
void	close()
ConfigDef	config() Configuration specification for this set of header converters.
void	configure(Map<String,?> configs) Configure this class with the given key-value pairs
void	configure(Map<String,?> configs, boolean isKey) Configure this class.
byte[]	fromConnectData(String topic, Schema schema, Object value) Convert a Kafka Connect data object to a native object for serialization.
byte[]	fromConnectHeader(String topic, String headerKey, Schema schema, Object value) Convert the Header's value into its byte array representation.
SchemaAndValue	toConnectData(String topic, byte[] value) Convert a native object to a Kafka Connect data object.
SchemaAndValue	toConnectHeader(String topic, String headerKey, byte[] value) Convert the header name and byte array value into a Header object.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.kafka.connect.storage.Converter

fromConnectData, toConnectData

Constructor Detail

StringConverter

public StringConverter()

Method Detail

config

public ConfigDef config()

Description copied from interface: HeaderConverter

Configuration specification for this set of header converters.

Specified by:

config in interface HeaderConverter

Returns:

the configuration specification; may not be null

configure

public void configure(Map<String,?> configs)

Description copied from interface: Configurable

Configure this class with the given key-value pairs

Specified by:

configure in interface Configurable

configure

public void configure(Map<String,?> configs,
                      boolean isKey)

Description copied from interface: Converter

Configure this class.

Specified by:

configure in interface Converter

Parameters:

configs - configs in key/value pairs

isKey - whether is for key or value

fromConnectData

public byte[] fromConnectData(String topic,
                              Schema schema,
                              Object value)

Description copied from interface: Converter

Convert a Kafka Connect data object to a native object for serialization.

Specified by:

fromConnectData in interface Converter

Parameters:

topic - the topic associated with the data

schema - the schema for the value

value - the value to convert

Returns:

the serialized value

toConnectData

public SchemaAndValue toConnectData(String topic,
                                    byte[] value)

Description copied from interface: Converter

Convert a native object to a Kafka Connect data object.

Specified by:

toConnectData in interface Converter

Parameters:

topic - the topic associated with the data

value - the value to convert

Returns:

an object containing the Schema and the converted value

fromConnectHeader

public byte[] fromConnectHeader(String topic,
                                String headerKey,
                                Schema schema,
                                Object value)

Description copied from interface: HeaderConverter

Convert the Header's value into its byte array representation.

Specified by:

fromConnectHeader in interface HeaderConverter

Parameters:

topic - the name of the topic for the record containing the header

headerKey - the header's key; may not be null

schema - the schema for the header's value; may be null

value - the header's value to convert; may be null

Returns:

the byte array form of the Header's value; may be null if the value is null

toConnectHeader

public SchemaAndValue toConnectHeader(String topic,
                                      String headerKey,
                                      byte[] value)

Description copied from interface: HeaderConverter

Convert the header name and byte array value into a Header object.

Specified by:

toConnectHeader in interface HeaderConverter

Parameters:

topic - the name of the topic for the record containing the header

headerKey - the header's key; may not be null

value - the header's raw value; may be null

Returns:

the SchemaAndValue; may not be null

close

public void close()

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable