io.realm

Class RealmConfiguration.Builder

java.lang.Object

io.realm.RealmConfiguration.Builder

Enclosing class:

RealmConfiguration

public static class RealmConfiguration.Builder
extends java.lang.Object

RealmConfiguration.Builder used to construct instances of a RealmConfiguration in a fluent manner.

Constructor Summary

Constructors

Constructor and Description
Builder(android.content.Context context) Creates an instance of the Builder for the RealmConfiguration.
Builder(java.io.File folder) Creates an instance of the Builder for the RealmConfiguration.

Method Summary

Modifier and Type	Method and Description
RealmConfiguration	build() Creates the RealmConfiguration based on the builder parameters.
RealmConfiguration.Builder	deleteRealmIfMigrationNeeded() Setting this will change the behavior of how migration exceptions are handled.
RealmConfiguration.Builder	encryptionKey(byte[] key) Sets the 64 bit key used to encrypt and decrypt the Realm file.
RealmConfiguration.Builder	inMemory() Setting this will create an in-memory Realm instead of saving it to disk.
RealmConfiguration.Builder	migration(RealmMigration migration) Sets the RealmMigration to be run if a migration is needed.
RealmConfiguration.Builder	name(java.lang.String filename) Sets the filename for the Realm.
RealmConfiguration.Builder	schemaVersion(long schemaVersion) Sets the schema version of the Realm.
RealmConfiguration.Builder	setModules(java.lang.Object baseModule, java.lang.Object... additionalModules) Replaces the existing module(s) with one or more RealmModules.

Methods inherited from class java.lang.Object

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

Constructor Detail

Builder

public Builder(java.io.File folder)

Creates an instance of the Builder for the RealmConfiguration. The Realm file will be saved in the provided folder.

Parameters:

folder - Folder to save Realm file in. Folder must be writable.

Throws:

java.lang.IllegalArgumentException - if folder doesn't exists or isn't writable.

Builder

public Builder(android.content.Context context)

Creates an instance of the Builder for the RealmConfiguration. This will use the apps own internal directory for storing the Realm file. This does not require any additional permissions. The default location is /data/data/<packagename>/files, but can change depending on vendor implementations of Android.

Parameters:

context - Android context.

Method Detail

name

public RealmConfiguration.Builder name(java.lang.String filename)

Sets the filename for the Realm.

encryptionKey

public RealmConfiguration.Builder encryptionKey(byte[] key)

Sets the 64 bit key used to encrypt and decrypt the Realm file.

schemaVersion

public RealmConfiguration.Builder schemaVersion(long schemaVersion)

Sets the schema version of the Realm. This must be equal to or higher than the schema version of the existing Realm file, if any. If the schema version is higher than the already existing Realm, a migration is needed. If no migration code is provided, Realm will throw a RealmMigrationNeededException.

See Also:

migration(RealmMigration)

migration

public RealmConfiguration.Builder migration(RealmMigration migration)

Sets the RealmMigration to be run if a migration is needed. If this migration fails to upgrade the on-disc schema to the runtime schema, a RealmMigrationNeededException will be thrown.

deleteRealmIfMigrationNeeded

public RealmConfiguration.Builder deleteRealmIfMigrationNeeded()

Setting this will change the behavior of how migration exceptions are handled. Instead of throwing a RealmMigrationNeededException the on-disc Realm will be cleared and recreated with the new Realm schema. WARNING! This will result in loss of data.

inMemory

public RealmConfiguration.Builder inMemory()

Setting this will create an in-memory Realm instead of saving it to disk. In-memory Realms might still use disk space if memory is running low, but all files created by an in-memory Realm will be deleted when the Realm is closed.

Note that because in-memory Realms are not persisted, you must be sure to hold on to at least one non-closed reference to the in-memory Realm object with the specific name as long as you want the data to last.

setModules

public RealmConfiguration.Builder setModules(java.lang.Object baseModule,
                                             java.lang.Object... additionalModules)

Replaces the existing module(s) with one or more RealmModules. Using this method will replace the current schema for this Realm with the schema defined by the provided modules. A reference to the default Realm module containing all Realm classes in the project (but not dependencies), can be found using Realm.getDefaultModule(). Combining the schema from the app project and a library dependency is thus done using the following code: builder.setModules(Realm.getDefaultMode(), new MyLibraryModule());

Parameters:

baseModule - the first Realm module (required).

additionalModules - the additional Realm modules

Throws:

java.lang.IllegalArgumentException - if any of the modules doesn't have the RealmModule annotation.

See Also:

Realm.getDefaultModule()

build

public RealmConfiguration build()

Creates the RealmConfiguration based on the builder parameters.

Returns:

the created RealmConfiguration.