org.bson.codecs

类 BsonUndefinedCodec

java.lang.Object

org.bson.codecs.BsonUndefinedCodec

所有已实现的接口:

Codec<BsonUndefined>, Decoder<BsonUndefined>, Encoder<BsonUndefined>

public class BsonUndefinedCodec
extends java.lang.Object
implements Codec<BsonUndefined>

Allows reading and writing of the BSON Undefined type. On encoding, it will write the correct type to the BsonWriter, but ignore the value, and on decoding it will read the type off the BsonReader and return an Undefined type, which simply represents a placeholder for the undefined value.

The undefined type is deprecated (see the spec).

从以下版本开始:

3.0

另请参阅:

BSON Spec, BsonType.UNDEFINED

构造器概要

构造器

构造器和说明
BsonUndefinedCodec()

方法概要

限定符和类型	方法和说明
BsonUndefined	decode(BsonReader reader, DecoderContext decoderContext) Decodes a BSON value from the given reader into an instance of the type parameter T.
void	encode(BsonWriter writer, BsonUndefined value, EncoderContext encoderContext) Encode an instance of the type parameter T into a BSON value.
java.lang.Class<BsonUndefined>	getEncoderClass() Returns the Class instance that this encodes.

从类继承的方法 java.lang.Object

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

构造器详细资料

BsonUndefinedCodec

public BsonUndefinedCodec()

方法详细资料

decode

public BsonUndefined decode(BsonReader reader,
                            DecoderContext decoderContext)

从接口复制的说明: Decoder

Decodes a BSON value from the given reader into an instance of the type parameter T.

指定者:

decode 在接口中 Decoder<BsonUndefined>

参数:

reader - the BSON reader

decoderContext - the decoder context

返回:

an instance of the type parameter T.

encode

public void encode(BsonWriter writer,
                   BsonUndefined value,
                   EncoderContext encoderContext)

从接口复制的说明: Encoder

Encode an instance of the type parameter T into a BSON value.

指定者:

encode 在接口中 Encoder<BsonUndefined>

参数:

writer - the BSON writer to encode into

value - the value to encode

encoderContext - the encoder context

getEncoderClass

public java.lang.Class<BsonUndefined> getEncoderClass()

从接口复制的说明: Encoder

Returns the Class instance that this encodes. This is necessary because Java does not reify generic types.

指定者:

getEncoderClass 在接口中 Encoder<BsonUndefined>

返回:

the Class instance that this encodes.