forked from GitHub-Mirror/riotX-android
68 lines
2.4 KiB
Kotlin
68 lines
2.4 KiB
Kotlin
/*
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* Copyright 2019 New Vector Ltd
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package im.vector.matrix.android.internal.database
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import androidx.lifecycle.LiveData
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import androidx.lifecycle.Observer
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import com.zhuinden.monarchy.Monarchy
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import io.realm.RealmObject
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import java.util.concurrent.atomic.AtomicBoolean
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internal interface LiveEntityObserver {
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fun start()
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fun dispose()
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}
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internal abstract class RealmLiveEntityObserver<T : RealmObject>(protected val monarchy: Monarchy)
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: Observer<Monarchy.ManagedChangeSet<T>>, LiveEntityObserver {
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protected abstract val query: Monarchy.Query<T>
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private val isStarted = AtomicBoolean(false)
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private val liveResults: LiveData<Monarchy.ManagedChangeSet<T>> by lazy {
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monarchy.findAllManagedWithChanges(query)
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}
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override fun start() {
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if (isStarted.compareAndSet(false, true)) {
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liveResults.observeForever(this)
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}
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}
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override fun dispose() {
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if (isStarted.compareAndSet(true, false)) {
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liveResults.removeObserver(this)
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}
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}
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// PRIVATE
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override fun onChanged(changeSet: Monarchy.ManagedChangeSet<T>?) {
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if (changeSet == null) {
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return
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}
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val insertionIndexes = changeSet.orderedCollectionChangeSet.insertions
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val updateIndexes = changeSet.orderedCollectionChangeSet.changes
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val deletionIndexes = changeSet.orderedCollectionChangeSet.deletions
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val inserted = changeSet.realmResults.filterIndexed { index, _ -> insertionIndexes.contains(index) }
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val updated = changeSet.realmResults.filterIndexed { index, _ -> updateIndexes.contains(index) }
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val deleted = changeSet.realmResults.filterIndexed { index, _ -> deletionIndexes.contains(index) }
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process(inserted, updated, deleted)
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}
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abstract fun process(inserted: List<T>, updated: List<T>, deleted: List<T>)
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} |