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FlowExtensions.kt
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FlowExtensions.kt
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/*
* Copyright (C) 2018 Square, 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.
*/
@file:JvmName("FlowQuery")
package app.cash.sqldelight.coroutines
import app.cash.sqldelight.Query
import app.cash.sqldelight.async.coroutines.awaitAsList
import app.cash.sqldelight.async.coroutines.awaitAsOne
import app.cash.sqldelight.async.coroutines.awaitAsOneOrNull
import kotlinx.coroutines.channels.Channel
import kotlinx.coroutines.channels.Channel.Factory.CONFLATED
import kotlinx.coroutines.flow.Flow
import kotlinx.coroutines.flow.flow
import kotlinx.coroutines.flow.map
import kotlinx.coroutines.flow.mapNotNull
import kotlinx.coroutines.withContext
import kotlin.coroutines.CoroutineContext
import kotlin.jvm.JvmName
import kotlin.jvm.JvmOverloads
/** Turns this [Query] into a [Flow] which emits whenever the underlying result set changes. */
@JvmName("toFlow")
fun <T : Any> Query<T>.asFlow(): Flow<Query<T>> = flow {
val channel = Channel<Unit>(CONFLATED)
channel.trySend(Unit)
val listener = object : Query.Listener {
override fun queryResultsChanged() {
channel.trySend(Unit)
}
}
addListener(listener)
try {
for (item in channel) {
emit(this@asFlow)
}
} finally {
removeListener(listener)
}
}
@JvmOverloads
fun <T : Any> Flow<Query<T>>.mapToOne(
context: CoroutineContext,
): Flow<T> = map {
withContext(context) {
it.awaitAsOne()
}
}
@JvmOverloads
fun <T : Any> Flow<Query<T>>.mapToOneOrDefault(
defaultValue: T,
context: CoroutineContext,
): Flow<T> = map {
withContext(context) {
it.awaitAsOneOrNull() ?: defaultValue
}
}
@JvmOverloads
fun <T : Any> Flow<Query<T>>.mapToOneOrNull(
context: CoroutineContext,
): Flow<T?> = map {
withContext(context) {
it.awaitAsOneOrNull()
}
}
@JvmOverloads
fun <T : Any> Flow<Query<T>>.mapToOneNotNull(
context: CoroutineContext,
): Flow<T> = mapNotNull {
withContext(context) {
it.awaitAsOneOrNull()
}
}
@JvmOverloads
fun <T : Any> Flow<Query<T>>.mapToList(
context: CoroutineContext,
): Flow<List<T>> = map {
withContext(context) {
it.awaitAsList()
}
}