forked from GitHub-Mirror/riotX-android
61 lines
2.0 KiB
Kotlin
61 lines
2.0 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.rx
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import androidx.lifecycle.LiveData
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import androidx.lifecycle.Observer
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import io.reactivex.Observable
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import io.reactivex.android.MainThreadDisposable
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private class LiveDataObservable<T>(
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private val liveData: LiveData<T>,
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private val valueIfNull: T? = null
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) : Observable<T>() {
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override fun subscribeActual(observer: io.reactivex.Observer<in T>) {
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val relay = RemoveObserverInMainThread(observer)
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observer.onSubscribe(relay)
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liveData.observeForever(relay)
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}
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private inner class RemoveObserverInMainThread(private val observer: io.reactivex.Observer<in T>)
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: MainThreadDisposable(), Observer<T> {
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override fun onChanged(t: T?) {
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if (!isDisposed) {
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if (t == null) {
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if (valueIfNull != null) {
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observer.onNext(valueIfNull)
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} else {
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observer.onError(NullPointerException(
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"convert liveData value t to RxJava onNext(t), t cannot be null"))
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}
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} else {
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observer.onNext(t)
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}
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}
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}
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override fun onDispose() {
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liveData.removeObserver(this)
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}
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}
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}
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fun <T> LiveData<T>.asObservable(defaultValue: T? = null): Observable<T> {
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return LiveDataObservable(this, defaultValue)
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} |