RealmConfiguration.Builder (Realm 4.3.2)

java.lang.Object
- io.realm.RealmConfiguration.Builder

Enclosing class:

RealmConfiguration
```
public static class RealmConfiguration.Builder
extends Object
```
RealmConfiguration.Builder used to construct instances of a RealmConfiguration in a fluent manner.

Constructor Summary

Constructors
Constructor and Description

Builder()
Creates an instance of the Builder for the RealmConfiguration.

Constructors
Constructor and Description
`Builder()` Creates an instance of the Builder for the RealmConfiguration.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`RealmConfiguration.Builder`	`assetFile(String assetFile)` Copies the Realm file from the given asset file path.
`RealmConfiguration`	`build()` Creates the RealmConfiguration based on the builder parameters.
`RealmConfiguration.Builder`	`compactOnLaunch()` Setting this will cause Realm to compact the Realm file if the Realm file has grown too large and a significant amount of space can be recovered.
`RealmConfiguration.Builder`	`compactOnLaunch(CompactOnLaunchCallback compactOnLaunch)` Sets this to determine if the Realm file should be compacted before returned to the user.
`RealmConfiguration.Builder`	`deleteRealmIfMigrationNeeded()` Setting this will change the behavior of how migration exceptions are handled.
`RealmConfiguration.Builder`	`directory(File directory)` Specifies the directory where the Realm file will be saved.
`RealmConfiguration.Builder`	`encryptionKey(byte[] key)` Sets the 64 byte key used to encrypt and decrypt the Realm file.
`RealmConfiguration.Builder`	`initialData(Realm.Transaction transaction)` Sets the initial data in `Realm`.
`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`	`modules(Object baseModule, Object... additionalModules)` Replaces the existing module(s) with one or more `RealmModule`s.
`RealmConfiguration.Builder`	`name(String filename)` Sets the filename for the Realm file.
`RealmConfiguration.Builder`	`readOnly()` Setting this will cause the Realm to become read only and all write transactions made against this Realm will fail with an `IllegalStateException`.
`RealmConfiguration.Builder`	`rxFactory(RxObservableFactory factory)` Sets the `RxObservableFactory` used to create Rx Observables from Realm objects.
`RealmConfiguration.Builder`	`schemaVersion(long schemaVersion)` Sets the schema version of the Realm.

Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - Builder
```
public Builder()
```
    Creates an instance of the Builder for the RealmConfiguration.
    This will use the app's 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.
- Method Detail
  - name
```
public RealmConfiguration.Builder name(String filename)
```
    Sets the filename for the Realm file.
  - directory
```
public RealmConfiguration.Builder directory(File directory)
```
    Specifies the directory where the Realm file will be saved. The default value is context.getFilesDir(). If the directory does not exist, it will be created.
    
    Parameters:
    
    directory - the directory to save the Realm file in. Directory must be writable.
    
    Throws:
    
    IllegalArgumentException - if directory is null, not writable or a file.
  - encryptionKey
```
public RealmConfiguration.Builder encryptionKey(byte[] key)
```
    Sets the 64 byte key used to encrypt and decrypt the Realm file. Sets the 64 bytes 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.
    
    This cannot be configured to have an asset file at the same time by calling assetFile(String) as the provided asset file will be deleted in migrations.
    
    WARNING! This will result in loss of data.
    
    Throws:
    
    IllegalStateException - if configured to use an asset file by calling assetFile(String) previously.
  - 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.
  - modules
```
public RealmConfiguration.Builder modules(Object baseModule,
                                          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.modules(Realm.getDefaultMode(), new MyLibraryModule());
    
    Parameters:
    
    baseModule - the first Realm module (required).
    
    additionalModules - the additional Realm modules
    
    Throws:
    
    IllegalArgumentException - if any of the modules doesn't have the RealmModule annotation.
    
    See Also:
    
    Realm.getDefaultModule()
  - rxFactory
```
public RealmConfiguration.Builder rxFactory(RxObservableFactory factory)
```
    Sets the RxObservableFactory used to create Rx Observables from Realm objects. The default factory is RealmObservableFactory.
    
    Parameters:
    
    factory - factory to use.
  - initialData
```
public RealmConfiguration.Builder initialData(Realm.Transaction transaction)
```
    Sets the initial data in Realm. This transaction will be executed only for the first time when database file is created or while migrating the data when deleteRealmIfMigrationNeeded() is set.
    
    Parameters:
    
    transaction - transaction to execute.
  - assetFile
```
public RealmConfiguration.Builder assetFile(String assetFile)
```
    Copies the Realm file from the given asset file path.
    When opening the Realm for the first time, instead of creating an empty file, the Realm file will be copied from the provided asset file and used instead.
    This cannot be combined with deleteRealmIfMigrationNeeded() as doing so would just result in the copied file being deleted.
    WARNING: This could potentially be a lengthy operation and should ideally be done on a background thread.
    
    Parameters:
    
    assetFile - path to the asset database file.
    
    Throws:
    
    IllegalStateException - if this is configured to clear its schema by calling deleteRealmIfMigrationNeeded().
  - readOnly
```
public RealmConfiguration.Builder readOnly()
```
    Setting this will cause the Realm to become read only and all write transactions made against this Realm will fail with an IllegalStateException.
    This in particular mean that initialData(Realm.Transaction) will not work in combination with a read only Realm and setting this will result in a IllegalStateException being thrown.
    Marking a Realm as read only only applies to the Realm in this process. Other processes can still write to the Realm.
  - compactOnLaunch
```
public RealmConfiguration.Builder compactOnLaunch()
```
    Setting this will cause Realm to compact the Realm file if the Realm file has grown too large and a significant amount of space can be recovered. See DefaultCompactOnLaunchCallback for details.
  - compactOnLaunch
```
public RealmConfiguration.Builder compactOnLaunch(CompactOnLaunchCallback compactOnLaunch)
```
    Sets this to determine if the Realm file should be compacted before returned to the user. It is passed the total file size (data + free space) and the bytes used by data in the file.
    
    Parameters:
    
    compactOnLaunch - a callback called when opening a Realm for the first time during the life of a process to determine if it should be compacted before being returned to the user. It is passed the total file size (data + free space) and the bytes used by data in the file.
  - build
```
public RealmConfiguration build()
```
    Creates the RealmConfiguration based on the builder parameters.
    
    Returns:
    
    the created RealmConfiguration.

Class RealmConfiguration.Builder

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

Builder

Method Detail

name

directory

encryptionKey

schemaVersion

migration

deleteRealmIfMigrationNeeded

inMemory

modules

rxFactory

initialData

assetFile

readOnly

compactOnLaunch

compactOnLaunch

build