Removed all but the message.stateIn from AppState Added interface and implementation, dependency injectionpull/1461/head
TM
1 year ago
parent
86c32eedd3
commit
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/*
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* Copyright 2024 The Android Open Source Project
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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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* https://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 com.google.samples.apps.nowinandroid.core.data.util
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import kotlinx.coroutines.flow.Flow
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/**
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* Interface for handling error messages.
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*/
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interface ErrorMonitor {
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fun addErrorMessage(error: String): String?
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fun clearErrorMessage(id: String)
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val errorMessage: Flow<ErrorMessage?>
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}
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/*
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* Copyright 2024 The Android Open Source Project
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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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* https://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 com.google.samples.apps.nowinandroid.core.data.util
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import kotlinx.coroutines.flow.Flow
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import kotlinx.coroutines.flow.MutableStateFlow
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import kotlinx.coroutines.flow.map
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import kotlinx.coroutines.flow.update
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import java.util.UUID
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/**
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* Interface implementation for handling general errors.
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*/
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class SnackbarErrorMonitor : ErrorMonitor {
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/**
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* List of [ErrorMessage] to be shown to the user, via Snackbar.
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*/
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private val errorMessages = MutableStateFlow<List<ErrorMessage>>(emptyList())
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/**
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* Current [ErrorMessage] or null if there are none.
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*/
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override val errorMessage: Flow<ErrorMessage?> = errorMessages.map { it.firstOrNull() }
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/**
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* Creates an [ErrorMessage] from String value and adds it to the list.
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*
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* @param error: String value of the error message.
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*
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* Returns the ID of the new [ErrorMessage] if success
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* Returns null if [error] is Blank
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*/
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override fun addErrorMessage(error: String): String? {
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if (error.isNotBlank()) {
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val newError = ErrorMessage(error)
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errorMessages.update { it + newError }
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return newError.id
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}
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return null
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}
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/**
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* Removes the [ErrorMessage] with the specified [id] from the list.
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*/
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override fun clearErrorMessage(id: String) {
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errorMessages.update { it.filter { item -> item.id != id } }
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}
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}
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/**
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* Models the data needed for an error message to be displayed and tracked.
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*/
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data class ErrorMessage(
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val message: String,
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val id: String = UUID.randomUUID().toString(),
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)
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