cn.leancloud

Class LCRelation<T extends LCObject>

java.lang.Object

cn.leancloud.LCRelation<T>

public class LCRelation<T extends LCObject>
extends Object

Constructor Summary

Constructors

Constructor and Description
LCRelation()
LCRelation(LCObject parent, String key)
LCRelation(String targetClass)

Method Summary

Modifier and Type	Method and Description
void	add(T object) Adds an object to this relation.
void	addAll(Collection<T> objects) Adds many objects to this relation.
String	getKey()
LCObject	getParent()
LCQuery<T>	getQuery() Gets a query that can be used to query the objects in this relation.
LCQuery<T>	getQuery(Class<T> clazz) Gets a query that can be used to query the subclass objects in this relation.
String	getTargetClass()
void	remove(LCObject object) Removes an object from this relation.
static <M extends LCObject> LCQuery<M>	reverseQuery(Class<M> theParentClazz, String relationKey, LCObject child) Create a query that can be used to query the parent objects in this relation.
static <M extends LCObject> LCQuery<M>	reverseQuery(String parentClassName, String relationKey, LCObject child) Create a query that can be used to query the parent objects in this relation.
void	setKey(String key)
void	setParent(LCObject parent)
void	setTargetClass(String targetClass)

Methods inherited from class java.lang.Object

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

Constructor Detail

LCRelation

public LCRelation()

LCRelation

public LCRelation(LCObject parent,
                  String key)

LCRelation

public LCRelation(String targetClass)

Method Detail

getKey

public String getKey()

setKey

public void setKey(String key)

getParent

public LCObject getParent()

setParent

public void setParent(LCObject parent)

getTargetClass

public String getTargetClass()

setTargetClass

public void setTargetClass(String targetClass)

add

public void add(T object)

Adds an object to this relation.

Parameters:

object - The object to add to this relation.

addAll

public void addAll(Collection<T> objects)

Adds many objects to this relation.

Parameters:

objects - The objects to add to this relation.

remove

public void remove(LCObject object)

Removes an object from this relation.

Parameters:

object - The object to remove from this relation.

getQuery

public LCQuery<T> getQuery()

Gets a query that can be used to query the objects in this relation.

Returns:

A AVQuery that restricts the results to objects in this relations.

getQuery

public LCQuery<T> getQuery(Class<T> clazz)

Gets a query that can be used to query the subclass objects in this relation.

Parameters:

clazz - The AVObject subclass.

Returns:

A AVQuery that restricts the results to objects in this relations.

reverseQuery

public static <M extends LCObject> LCQuery<M> reverseQuery(String parentClassName,
                                                           String relationKey,
                                                           LCObject child)

Create a query that can be used to query the parent objects in this relation.

Type Parameters:

M - template type.

Parameters:

parentClassName - The parent class name

relationKey - The relation field key in parent

child - The child object.

Returns:

A AVQuery that restricts the results to parent objects in this relations.

reverseQuery

public static <M extends LCObject> LCQuery<M> reverseQuery(Class<M> theParentClazz,
                                                           String relationKey,
                                                           LCObject child)

Create a query that can be used to query the parent objects in this relation.

Type Parameters:

M - template type.

Parameters:

theParentClazz - The parent subclass.

relationKey - The relation field key in parent

child - The child object.

Returns:

A AVQuery that restricts the results to parent objects in this relations.