org.bson.codecs

接口 CollectibleCodec<T>

类型参数:

T - the document type

所有超级接口:

Codec<T>, Decoder<T>, Encoder<T>

所有已知实现类:

BsonDocumentCodec, DBObjectCodec, DocumentCodec

public interface CollectibleCodec<T>
extends Codec<T>

A Codec that generates complete BSON documents for storage in a MongoDB collection.

从以下版本开始:

3.0

方法概要

限定符和类型	方法和说明
boolean	documentHasId(T document) Returns true if the given document has an _id.
T	generateIdIfAbsentFromDocument(T document) Generates a value for the _id field on the given document, if the document does not have one.
BsonValue	getDocumentId(T document) Gets the _id of the given document if it contains one, otherwise throws IllegalArgumentException.

从接口继承的方法 org.bson.codecs.Encoder

encode, getEncoderClass

从接口继承的方法 org.bson.codecs.Decoder

decode

方法详细资料

generateIdIfAbsentFromDocument

T generateIdIfAbsentFromDocument(T document)

Generates a value for the _id field on the given document, if the document does not have one.

参数:

document - the document for which to generate a value for the _id.

返回:

the document with the _id

documentHasId

boolean documentHasId(T document)

Returns true if the given document has an _id.

参数:

document - the document in which to look for an _id

返回:

true if the document has an _id

getDocumentId

BsonValue getDocumentId(T document)

Gets the _id of the given document if it contains one, otherwise throws IllegalArgumentException. To avoid the latter case, call documentHasId first to check.

参数:

document - the document from which to get the _id

返回:

the _id of the document

抛出:

java.lang.IllegalStateException - if the document does not contain an _id