org.bson

接口 BSONObject

所有超级接口:

Serializable

所有已知实现类:

BasicBSONList, BasicBSONObject

public interface BSONObject
extends Serializable

A key-value map that can be saved to the database.

方法概要

限定符和类型	方法和说明
<T> T	as(Class<T> cls) Return an instance of the class "cls", only for BasicBSONObject.
<T> T	as(Class<T> cls, Type eleType) Return an instance of the class "cls", only for BasicBSONObject.
boolean	containsField(String s) Checks if this object contains a field with the given name.
Object	get(String key) Gets a field from this object by a given name.
boolean	isEmpty() The current bson object keeps any elements or not
Set<String>	keySet() Returns this object's fields' names
Object	put(String key, Object v) Sets a name/value pair in this object.
void	putAll(BSONObject o) Sets all key/value pairs from an object into this object
void	putAll(Map m) Sets all key/value pairs from a map into this object
Object	removeField(String key) Removes a field with a given name from this object.
Map	toMap() Returns a map representing this BSONObject.

方法详细资料

as

<T> T as(Class<T> cls)
  throws Exception

Return an instance of the class "cls", only for BasicBSONObject.

参数:

cls - target class object

返回:

the instance of the class

抛出:

Exception - If error happens.

as

<T> T as(Class<T> cls,
         Type eleType)
  throws Exception

Return an instance of the class "cls", only for BasicBSONObject.

参数:

cls - target class object

返回:

the instance of the class

抛出:

Exception - If error happens.

containsField

boolean containsField(String s)

Checks if this object contains a field with the given name.

参数:

s - Field name for which to check

返回:

True if the field is present

get

Object get(String key)

Gets a field from this object by a given name.

参数:

key - The name of the field fetch

返回:

The field, if found

isEmpty

boolean isEmpty()

The current bson object keeps any elements or not

返回:

true for empty, false for not

keySet

Set<String> keySet()

Returns this object's fields' names

返回:

The names of the fields in this object

put

Object put(String key,
           Object v)

Sets a name/value pair in this object.

参数:

key - Name to set

v - Corresponding value

返回:

v

putAll

void putAll(BSONObject o)

Sets all key/value pairs from an object into this object

参数:

o - the object

putAll

void putAll(Map m)

Sets all key/value pairs from a map into this object

参数:

m - the map

removeField

Object removeField(String key)

Removes a field with a given name from this object.

参数:

key - The name of the field to remove

返回:

The value removed from this object

toMap

Map toMap()

Returns a map representing this BSONObject.

返回:

the map