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Pharmacy available medicines now displayed with pagination using Remo…
…teMediator.
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97
...pt/ulisboa/ist/pharmacist/repository/remote/pharmacies/PharmacyMedicinesRemoteMediator.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,97 @@ | ||
| package pt.ulisboa.ist.pharmacist.repository.remote.pharmacies | ||
|
|
||
| import android.util.Log | ||
| import androidx.paging.ExperimentalPagingApi | ||
| import androidx.paging.LoadType | ||
| import androidx.paging.PagingState | ||
| import androidx.paging.RemoteMediator | ||
| import androidx.room.withTransaction | ||
| import okio.IOException | ||
| import pt.ulisboa.ist.pharmacist.repository.local.PharmacistDatabase | ||
| import pt.ulisboa.ist.pharmacist.repository.local.medicines.MedicineDao | ||
| import pt.ulisboa.ist.pharmacist.repository.local.medicines.PharmacyMedicineEntity | ||
| import pt.ulisboa.ist.pharmacist.repository.local.medicines.PharmacyMedicineFlatEntity | ||
| import pt.ulisboa.ist.pharmacist.repository.network.connection.isSuccess | ||
|
|
||
| @OptIn(ExperimentalPagingApi::class) | ||
| class PharmacyMedicinesRemoteMediator( | ||
| private val pharmacistDb: PharmacistDatabase, | ||
| private val pharmacyApi: PharmacyApi, | ||
| private val pharmacyId: Long | ||
| ) : RemoteMediator<Int, PharmacyMedicineFlatEntity>() { | ||
|
|
||
| override suspend fun load( | ||
| loadType: LoadType, | ||
| state: PagingState<Int, PharmacyMedicineFlatEntity> | ||
| ): MediatorResult { | ||
| val offset = when (loadType) { | ||
| LoadType.REFRESH -> STARTING_KEY | ||
| LoadType.PREPEND -> return MediatorResult.Success(endOfPaginationReached = true) | ||
| LoadType.APPEND -> { | ||
| state.pages.flatten().size | ||
| } | ||
| } | ||
|
|
||
| val limit = state.config.pageSize | ||
|
|
||
| Log.d("PharmacyMedicinesRemoteMediator", "LoadType: $loadType") | ||
| Log.d( | ||
| "PharmacyMedicinesRemoteMediator", | ||
| "Item count: ${state.pages.flatten().map { it.medicineId }}" | ||
| ) | ||
| Log.d("PharmacyMedicinesRemoteMediator", "Offset: $offset, Limit: $limit") | ||
|
|
||
| return try { | ||
| val result = pharmacyApi.listAvailableMedicines( | ||
| pharmacyId = pharmacyId, | ||
| limit = limit.toLong(), | ||
| offset = offset.toLong() | ||
| ) | ||
|
|
||
| if (!result.isSuccess()) { | ||
| return MediatorResult.Error(Exception("Error loading data")) | ||
| } | ||
|
|
||
| Log.d("PharmacyMedicinesRemoteMediator", "Result: ${result.data.medicines.size}") | ||
|
|
||
| pharmacistDb.withTransaction { | ||
| if (loadType == LoadType.REFRESH) | ||
| pharmacistDb.pharmacyDao().clearPharmacyMedicineByPharmacyId(pharmacyId) | ||
|
|
||
| pharmacistDb.medicineDao().upsertBaseMedicines(result.data.medicines.map { | ||
| MedicineDao.MedicineBaseEntity( | ||
| medicineId = it.medicine.medicineId, | ||
| name = it.medicine.name, | ||
| description = it.medicine.description, | ||
| boxPhotoUrl = it.medicine.boxPhotoUrl | ||
| ) | ||
| }) | ||
| pharmacistDb.pharmacyDao().upsertPharmacyMedicineList(result.data.medicines.map { | ||
| PharmacyMedicineEntity( | ||
| pharmacyId = pharmacyId, | ||
| medicineId = it.medicine.medicineId, | ||
| stock = it.stock | ||
| ) | ||
| }) | ||
| } | ||
|
|
||
| Log.d( | ||
| "PharmacyMedicinesRemoteMediator", | ||
| "Reached end of pagination: ${result.data.medicines.isEmpty() || result.data.medicines.size < limit}" | ||
| ) | ||
|
|
||
| MediatorResult.Success( | ||
| endOfPaginationReached = | ||
| result.data.medicines.isEmpty() || result.data.medicines.size < limit | ||
| ) | ||
| } catch (e: IOException) { | ||
| MediatorResult.Error(e) | ||
| } catch (e: Exception) { | ||
| MediatorResult.Error(e) | ||
| } | ||
| } | ||
|
|
||
| companion object { | ||
| const val STARTING_KEY = 0 | ||
| } | ||
| } |
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