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Library code for Realm Kotlin. This artifact is not supposed to be consumed directly, but through 'io.realm.kotlin:gradle-plugin:0.4.1' instead.
/*
* Copyright 2021 Realm Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.realm
import io.realm.internal.RealmLog
import io.realm.internal.RealmReference
import io.realm.interop.NativePointer
import io.realm.interop.RealmInterop
import kotlinx.coroutines.flow.Flow
import kotlin.reflect.KClass
/**
* Base class for all Realm instances ([Realm] and [MutableRealm]).
*/
@Suppress("UnnecessaryAbstractClass")
public abstract class BaseRealm internal constructor(
/**
* Configuration used to configure this Realm instance.
*/
public val configuration: RealmConfiguration,
dbPointer: NativePointer
) {
private companion object {
private const val observablesNotSupportedMessage = "Observing changes are not supported by this Realm."
}
/**
* Realm reference that links the Kotlin instance with the underlying C++ SharedRealm.
*
* The C++ SharedRealm can be either a frozen or live realm, so even though this reference is
* not updated the version of the underlying Realm can change.
*
* NOTE: [Realm] overwrites this to an updatable property which is advanced when the [Realm] is
* updated to point to a new frozen version after writes or notification, so care should be
* taken not to spread operations over different references.
*/
internal open var realmReference: RealmReference = RealmReference(this, dbPointer)
set(_) {
throw UnsupportedOperationException("BaseRealm reference should never be updated")
}
/**
* The current version of the data in this realm.
*/
// TODO Could be abstracted into base implementation of RealmLifeCycle!?
public var version: VersionId = VersionId(0)
get() { return realmReference.version() }
internal val log: RealmLog = RealmLog(configuration = configuration.log)
init {
log.info("Realm opened: ${configuration.path}")
}
/**
* Returns the results of querying for all objects of a specific type.
*
* For a [Realm] instance this reflects the state of the realm at the invocation time, thus
* the results will not change on updates to the Realm. For a [MutableRealm] the result is live
* and will in fact reflect updates to the [MutableRealm].
*
* @param clazz The class of the objects to query for.
* @return The result of the query as of the time of invoking this method.
*/
open fun objects(clazz: KClass): RealmResults {
// Use same reference through out all operations to avoid locking
val realmReference = this.realmReference
realmReference.checkClosed()
return RealmResults.fromQuery(
realmReference,
RealmInterop.realm_query_parse(realmReference.dbPointer, clazz.simpleName!!, "TRUEPREDICATE"),
clazz,
configuration.mediator
)
}
/**
* Returns the results of querying for all objects of a specific type.
*
* Convenience inline method to catch the reified class type of single argument variant of [objects].
*
* @param T The type of the objects to query for.
* @return The result of the query. Dependent of the type of the Realm this will either reflect
* for [Realm]: the state at invocation or for [MutableRealm] the latest updated state of the
* mutable realm.
*/
inline fun objects(): RealmResults { return objects(T::class) }
internal open fun registerResultsChangeListener(
results: RealmResults,
callback: Callback>
): Cancellable {
throw NotImplementedError(observablesNotSupportedMessage)
}
internal open fun registerListChangeListener(
list: List,
callback: Callback>
): Cancellable {
throw NotImplementedError(observablesNotSupportedMessage)
}
internal open fun registerObjectChangeListener(
obj: T,
callback: Callback
): Cancellable {
throw NotImplementedError(observablesNotSupportedMessage)
}
internal open fun registerResultsObserver(results: RealmResults): Flow> {
throw NotImplementedError(observablesNotSupportedMessage)
}
internal open fun registerListObserver(list: List): Flow> {
throw NotImplementedError(observablesNotSupportedMessage)
}
internal open fun registerObjectObserver(obj: T): Flow {
throw NotImplementedError(observablesNotSupportedMessage)
}
/**
* Returns the current number of active versions in the Realm file. A large number of active versions can have
* a negative impact on the Realm file size on disk.
*
* @see [RealmConfiguration.Builder.maxNumberOfActiveVersions]
*/
public fun getNumberOfActiveVersions(): Long {
val reference = realmReference
reference.checkClosed()
return RealmInterop.realm_get_num_versions(reference.dbPointer)
}
/**
* Check if this Realm has been closed or not. If the Realm has been closed, most methods
* will throw [IllegalStateException] if called.
*
* @return `true` if the Realm has been closed. `false` if not.
*/
public fun isClosed(): Boolean {
return realmReference.isClosed()
}
// Not all sub classes of `BaseRealm` can be closed by users.
internal open fun close() {
val reference = realmReference
reference.checkClosed()
RealmInterop.realm_close(reference.dbPointer)
log.info("Realm closed: ${configuration.path}")
}
}