io.realm

Class RealmSchema

java.lang.Object

io.realm.RealmSchema

public abstract class RealmSchema
extends Object

Class for interacting with the Realm schema. This makes it possible to inspect, add, delete and change the classes in the Realm.

Realm.getSchema() returns an immutable RealmSchema which can only be used for inspecting. Use DynamicRealm.getSchema() to get a mutable schema.

All changes must happen inside a write transaction for the particular Realm.

See Also:

RealmMigration

Method Summary

Modifier and Type	Method and Description
boolean	contains(String className) Checks if a given class already exists in the schema.
abstract RealmObjectSchema	create(String className) Adds a new class to the Realm.
abstract RealmObjectSchema	createWithPrimaryKeyField(String className, String primaryKeyFieldName, Class<?> fieldType, FieldAttribute... attributes) Adds a new class to the Realm with a primary key field defined.
abstract RealmObjectSchema	get(String className) Returns the RealmObjectSchema for a given class.
Set<RealmObjectSchema>	getAll() Returns the RealmObjectSchemas for all RealmObject classes that can be saved in this Realm.
abstract void	remove(String className) Removes a class from the Realm.
abstract RealmObjectSchema	rename(String oldClassName, String newClassName) Renames a class already in the Realm.

Methods inherited from class java.lang.Object

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

Method Detail

get

public abstract RealmObjectSchema get(String className)

Returns the RealmObjectSchema for a given class. If this RealmSchema is immutable, an immutable RealmObjectSchema will be returned. Otherwise, it returns an mutable RealmObjectSchema.

Parameters:

className - name of the class

Returns:

schema object for that class or null if the class doesn't exists.

getAll

public Set<RealmObjectSchema> getAll()

Returns the RealmObjectSchemas for all RealmObject classes that can be saved in this Realm. If this RealmSchema is immutable, an immutable RealmObjectSchema set will be returned. Otherwise, it returns an mutable RealmObjectSchema set.

Returns:

the set of all classes in this Realm or no RealmObject classes can be saved in the Realm.

create

public abstract RealmObjectSchema create(String className)

Adds a new class to the Realm.

Parameters:

className - name of the class.

Returns:

a Realm schema object for that class.

Throws:

UnsupportedOperationException - if this RealmSchema is immutable.

createWithPrimaryKeyField

public abstract RealmObjectSchema createWithPrimaryKeyField(String className,
                                                            String primaryKeyFieldName,
                                                            Class<?> fieldType,
                                                            FieldAttribute... attributes)

Adds a new class to the Realm with a primary key field defined.

Parameters:

className - name of the class.

primaryKeyFieldName - name of the primary key field.

fieldType - type of field to add. Only byte, short, int, long and their boxed types or the String is supported.

attributes - set of attributes for this field. This method implicitly adds FieldAttribute.PRIMARY_KEY and FieldAttribute.INDEXED attributes to the field.

Returns:

a Realm schema object for that class.

Throws:

UnsupportedOperationException - if this RealmSchema is immutable.

remove

public abstract void remove(String className)

Removes a class from the Realm. All data will be removed. Removing a class while other classes point to it will throw an IllegalStateException. Removes those classes or fields first.

Parameters:

className - name of the class to remove.

Throws:

UnsupportedOperationException - if this RealmSchema is immutable.

rename

public abstract RealmObjectSchema rename(String oldClassName,
                                         String newClassName)

Renames a class already in the Realm.

Parameters:

oldClassName - old class name.

newClassName - new class name.

Returns:

a schema object for renamed class.

Throws:

UnsupportedOperationException - if this RealmSchema is immutable.

contains

public boolean contains(String className)

Checks if a given class already exists in the schema.

Parameters:

className - class name to check.

Returns:

true if the class already exists. false otherwise.