org.apache.flink.formats.json

Class JsonDeserializationSchema<T>

java.lang.Object

org.apache.flink.api.common.serialization.AbstractDeserializationSchema<T>

org.apache.flink.formats.json.JsonDeserializationSchema<T>

All Implemented Interfaces:

Serializable, DeserializationSchema<T>, ResultTypeQueryable<T>

Direct Known Subclasses:

JsonNodeDeserializationSchema

@PublicEvolving
public class JsonDeserializationSchema<T>
extends AbstractDeserializationSchema<T>

DeserializationSchema that deserializes a JSON String.

See Also:

Serialized Form

Nested Class Summary

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

DeserializationSchema.InitializationContext

Field Summary

Fields

Modifier and Type	Field and Description
protected org.apache.flink.shaded.jackson2.com.fasterxml.jackson.databind.ObjectMapper	mapper

Constructor Summary

Constructors

Constructor and Description
JsonDeserializationSchema(Class<T> clazz)
JsonDeserializationSchema(Class<T> clazz, SerializableSupplier<org.apache.flink.shaded.jackson2.com.fasterxml.jackson.databind.ObjectMapper> mapperFactory)
JsonDeserializationSchema(TypeInformation<T> typeInformation)
JsonDeserializationSchema(TypeInformation<T> typeInformation, SerializableSupplier<org.apache.flink.shaded.jackson2.com.fasterxml.jackson.databind.ObjectMapper> mapperFactory)

Method Summary

Modifier and Type	Method and Description
T	deserialize(byte[] message) De-serializes the byte message.
void	open(DeserializationSchema.InitializationContext context) Initialization method for the schema.

Methods inherited from class org.apache.flink.api.common.serialization.AbstractDeserializationSchema

getProducedType, isEndOfStream

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

Field Detail

mapper

protected transient org.apache.flink.shaded.jackson2.com.fasterxml.jackson.databind.ObjectMapper mapper

Constructor Detail

JsonDeserializationSchema

public JsonDeserializationSchema(Class<T> clazz)

JsonDeserializationSchema

public JsonDeserializationSchema(TypeInformation<T> typeInformation)

JsonDeserializationSchema

public JsonDeserializationSchema(Class<T> clazz,
                                 SerializableSupplier<org.apache.flink.shaded.jackson2.com.fasterxml.jackson.databind.ObjectMapper> mapperFactory)

JsonDeserializationSchema

public JsonDeserializationSchema(TypeInformation<T> typeInformation,
                                 SerializableSupplier<org.apache.flink.shaded.jackson2.com.fasterxml.jackson.databind.ObjectMapper> mapperFactory)

Method Detail

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.

Parameters:

context - Contextual information that can be used during initialization.

deserialize

public T deserialize(byte[] message)
              throws IOException

Description copied from class: AbstractDeserializationSchema

De-serializes the byte message.

Specified by:

deserialize in interface DeserializationSchema<T>

Specified by:

deserialize in class AbstractDeserializationSchema<T>

Parameters:

message - The message, as a byte array.

Returns:

The de-serialized message as an object.

Throws:

IOException