org.apache.flink.table.examples.java.connectors

Class ChangelogCsvDeserializer

java.lang.Object

org.apache.flink.table.examples.java.connectors.ChangelogCsvDeserializer

All Implemented Interfaces:

Serializable, DeserializationSchema<RowData>, ResultTypeQueryable<RowData>

public final class ChangelogCsvDeserializer
extends Object
implements DeserializationSchema<RowData>

The ChangelogCsvDeserializer contains a simple parsing logic for converting bytes into Row of Integer and String with a RowKind.

The final conversion step converts those into internal data structures.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.flink.api.common.serialization.DeserializationSchema

DeserializationSchema.InitializationContext

Constructor Summary

Constructors

Constructor and Description
ChangelogCsvDeserializer(List<LogicalType> parsingTypes, DynamicTableSource.DataStructureConverter converter, TypeInformation<RowData> producedTypeInfo, String columnDelimiter)

Method Summary

Modifier and Type	Method and Description
RowData	deserialize(byte[] message) Deserializes the byte message.
TypeInformation<RowData>	getProducedType() Gets the data type (as a TypeInformation) produced by this function or input format.
boolean	isEndOfStream(RowData nextElement) Method to decide whether the element signals the end of the stream.
void	open(DeserializationSchema.InitializationContext context) Initialization method for the schema.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.flink.api.common.serialization.DeserializationSchema

deserialize

Constructor Detail

ChangelogCsvDeserializer

public ChangelogCsvDeserializer(List<LogicalType> parsingTypes,
                                DynamicTableSource.DataStructureConverter converter,
                                TypeInformation<RowData> producedTypeInfo,
                                String columnDelimiter)

Method Detail

getProducedType

public TypeInformation<RowData> getProducedType()

Description copied from interface: ResultTypeQueryable

Gets the data type (as a TypeInformation) produced by this function or input format.

Specified by:

getProducedType in interface ResultTypeQueryable<RowData>

Returns:

The data type produced by this function or input format.

open

public void open(DeserializationSchema.InitializationContext context)

Description copied from interface: DeserializationSchema

Initialization method for the schema. It is called before the actual working methods DeserializationSchema.deserialize(byte[]) and thus suitable for one time setup work.

The provided DeserializationSchema.InitializationContext can be used to access additional features such as e.g. registering user metrics.

Specified by:

open in interface DeserializationSchema<RowData>

Parameters:

context - Contextual information that can be used during initialization.

deserialize

public RowData deserialize(byte[] message)

Description copied from interface: DeserializationSchema

Deserializes the byte message.

Specified by:

deserialize in interface DeserializationSchema<RowData>

Parameters:

message - The message, as a byte array.

Returns:

The deserialized message as an object (null if the message cannot be deserialized).

isEndOfStream

public boolean isEndOfStream(RowData nextElement)

Description copied from interface: DeserializationSchema

Method to decide whether the element signals the end of the stream. If true is returned the element won't be emitted.

Specified by:

isEndOfStream in interface DeserializationSchema<RowData>

Parameters:

nextElement - The element to test for the end-of-stream signal.

Returns:

True, if the element signals end of stream, false otherwise.