Add base code for multiple server (schools) support

app/src/main/java/net/underdesk/circolapp/data/CircularRepository.kt

@@ -2,20 +2,23 @@ package net.underdesk.circolapp.data
 
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
-import net.underdesk.circolapp.server.DataFetcher
+import net.underdesk.circolapp.server.ServerAPI
-import java.io.IOException
 
 class CircularRepository(
     val circularDao: CircularDao,
-    private val fetcher: DataFetcher = DataFetcher()
+    private val serverAPI: ServerAPI
 ) {
     suspend fun updateCirculars(returnNewCirculars: Boolean = true): Pair<List<Circular>, Boolean> {
         var onlyNewCirculars = listOf<Circular>()
 
-        try {
+        return withContext(Dispatchers.IO) {
-            withContext(Dispatchers.IO) {
+            val result = serverAPI.getCircularsFromServer()
+            if (result.second == ServerAPI.Companion.Result.ERROR)
+                return@withContext Pair(emptyList(), false)
+
             val oldCirculars = circularDao.getCirculars()
-                val newCirculars = fetcher.getCircularsFromServer()
+            val newCirculars = result.first
+
             if (newCirculars.size != oldCirculars.size) {
                 if (newCirculars.size < oldCirculars.size) {
                     circularDao.deleteAll()
@@ -31,21 +34,17 @@ class CircularRepository(
 
                 circularDao.insertAll(newCirculars)
             }
+            Pair(onlyNewCirculars, true)
         }
-        } catch (exception: IOException) {
-            return Pair(onlyNewCirculars, false)
-        }
-
-        return Pair(onlyNewCirculars, true)
     }
 
     companion object {
         @Volatile
         private var instance: CircularRepository? = null
 
-        fun getInstance(circularDao: CircularDao) =
+        fun getInstance(circularDao: CircularDao, serverAPI: ServerAPI) =
             instance ?: synchronized(this) {
-                instance ?: CircularRepository(circularDao).also { instance = it }
+                instance ?: CircularRepository(circularDao, serverAPI).also { instance = it }
             }
     }
 }

app/src/main/java/net/underdesk/circolapp/fragments/CircularLetterFragment.kt

@@ -34,6 +34,7 @@ import net.underdesk.circolapp.R
 import net.underdesk.circolapp.adapters.CircularLetterAdapter
 import net.underdesk.circolapp.data.AppDatabase
 import net.underdesk.circolapp.data.CircularRepository
+import net.underdesk.circolapp.server.ServerAPI
 import net.underdesk.circolapp.viewmodels.CircularLetterViewModel
 import net.underdesk.circolapp.viewmodels.CircularLetterViewModelFactory
 
@@ -45,7 +46,8 @@ class CircularLetterFragment :
     private val circularLetterViewModel: CircularLetterViewModel by viewModels {
         CircularLetterViewModelFactory(
             CircularRepository.getInstance(
-                AppDatabase.getInstance(requireContext()).circularDao()
+                AppDatabase.getInstance(requireContext()).circularDao(),
+                ServerAPI.getInstance(ServerAPI.Companion.Servers.CURIE)
             )
         )
     }

app/src/main/java/net/underdesk/circolapp/fragments/FavouritesFragment.kt

@@ -31,6 +31,7 @@ import net.underdesk.circolapp.R
 import net.underdesk.circolapp.adapters.CircularLetterAdapter
 import net.underdesk.circolapp.data.AppDatabase
 import net.underdesk.circolapp.data.CircularRepository
+import net.underdesk.circolapp.server.ServerAPI
 import net.underdesk.circolapp.viewmodels.FavouritesViewModel
 import net.underdesk.circolapp.viewmodels.FavouritesViewModelFactory
 
@@ -39,7 +40,8 @@ class FavouritesFragment : Fragment(), MainActivity.SearchCallback {
     private val favouritesViewModel: FavouritesViewModel by viewModels {
         FavouritesViewModelFactory(
             CircularRepository.getInstance(
-                AppDatabase.getInstance(requireContext()).circularDao()
+                AppDatabase.getInstance(requireContext()).circularDao(),
+                ServerAPI.getInstance(ServerAPI.Companion.Servers.CURIE)
             )
         )
     }

app/src/main/java/net/underdesk/circolapp/fragments/RemindersFragment.kt

@@ -31,6 +31,7 @@ import net.underdesk.circolapp.R
 import net.underdesk.circolapp.adapters.CircularLetterAdapter
 import net.underdesk.circolapp.data.AppDatabase
 import net.underdesk.circolapp.data.CircularRepository
+import net.underdesk.circolapp.server.ServerAPI
 import net.underdesk.circolapp.viewmodels.RemindersViewModel
 import net.underdesk.circolapp.viewmodels.RemindersViewModelFactory
 
@@ -39,7 +40,8 @@ class RemindersFragment : Fragment(), MainActivity.SearchCallback {
     private val remindersViewModel: RemindersViewModel by viewModels {
         RemindersViewModelFactory(
             CircularRepository.getInstance(
-                AppDatabase.getInstance(requireContext()).circularDao()
+                AppDatabase.getInstance(requireContext()).circularDao(),
+                ServerAPI.getInstance(ServerAPI.Companion.Servers.CURIE)
             )
         )
     }

app/src/main/java/net/underdesk/circolapp/server/DataFetcher.kt

@@ -1,80 +0,0 @@
-/*
- * Circolapp
- * Copyright (C) 2019-2020  Matteo Schiff
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- */
-
-package net.underdesk.circolapp.server
-
-import com.squareup.moshi.Moshi
-import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.withContext
-import net.underdesk.circolapp.data.Circular
-import net.underdesk.circolapp.server.pojo.Response
-import okhttp3.OkHttpClient
-import okhttp3.Request
-import org.jsoup.Jsoup
-import java.io.IOException
-
-class DataFetcher {
-    companion object {
-        const val ENDPOINT_URL = "https://www.curiepinerolo.edu.it/wp-json/wp/v2/pages/5958"
-
-        private val moshi = Moshi.Builder().build()
-        private val responseAdapter = moshi.adapter(Response::class.java)
-        private val client = OkHttpClient()
-    }
-
-    @Throws(IOException::class)
-    suspend fun getCircularsFromServer(): List<Circular> {
-        return withContext(Dispatchers.Default) {
-            val json = retrieveDataFromServer()
-
-            val document = Jsoup.parseBodyFragment(json.content.rendered)
-            val htmlList = document.getElementsByTag("ul")[0].getElementsByTag("a")
-
-            val list = ArrayList<Circular>()
-
-            htmlList.forEach { element ->
-                if (element.parents().size == 6) {
-                    list.last().attachmentsNames.add(element.text())
-                    list.last().attachmentsUrls.add(element.attr("href"))
-                } else if (element.parents().size == 4) {
-                    list.add(Circular.generateFromString(element.text(), element.attr("href")))
-                }
-            }
-            list
-        }
-    }
-
-    @Throws(IOException::class)
-    private suspend fun retrieveDataFromServer(): Response {
-        val request = Request.Builder()
-            .url(ENDPOINT_URL)
-            .build()
-
-        return withContext(Dispatchers.IO) {
-            val response = client.newCall(request).execute()
-
-            if (!response.isSuccessful) {
-                throw IOException("HTTP error code: ${response.code})")
-            }
-
-            responseAdapter.fromJson(
-                response.body!!.string()
-            )!!
-        }
-    }
-}

app/src/main/java/net/underdesk/circolapp/server/Server.kt

@@ -0,0 +1,26 @@
+/*
+ * Circolapp
+ * Copyright (C) 2019-2020  Matteo Schiff
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package net.underdesk.circolapp.server
+
+import net.underdesk.circolapp.data.Circular
+
+abstract class Server {
+    abstract suspend fun getCircularsFromServer(): Pair<List<Circular>, ServerAPI.Companion.Result>
+    abstract suspend fun newCircularsAvailable(): Pair<Boolean, ServerAPI.Companion.Result>
+}

app/src/main/java/net/underdesk/circolapp/server/ServerAPI.kt

@@ -0,0 +1,64 @@
+/*
+ * Circolapp
+ * Copyright (C) 2019-2020  Matteo Schiff
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package net.underdesk.circolapp.server
+
+import net.underdesk.circolapp.data.Circular
+import net.underdesk.circolapp.server.curie.CurieServer
+
+class ServerAPI(
+    private val server: Server
+) {
+    suspend fun getCircularsFromServer(): Pair<List<Circular>, Result> {
+        val newCircularsAvailable = server.newCircularsAvailable()
+
+        if (newCircularsAvailable.second == Result.ERROR)
+            return Pair(emptyList(), Result.ERROR)
+
+        if (!newCircularsAvailable.first)
+            return Pair(emptyList(), Result.SUCCESS)
+
+        return server.getCircularsFromServer()
+    }
+
+    companion object {
+        enum class Servers {
+            CURIE, PORPORATO
+        }
+
+        enum class Result {
+            SUCCESS, ERROR
+        }
+
+        @Volatile
+        private var instance: ServerAPI? = null
+
+        fun getInstance(server: Servers): ServerAPI {
+            return instance ?: synchronized(this) {
+                instance ?: createServerAPI(server).also { instance = it }
+            }
+        }
+
+        private fun createServerAPI(server: Servers): ServerAPI {
+            return when (server) {
+                Servers.CURIE -> ServerAPI(CurieServer())
+                Servers.PORPORATO -> TODO()
+            }
+        }
+    }
+}

app/src/main/java/net/underdesk/circolapp/server/curie/CurieServer.kt

@@ -0,0 +1,71 @@
+package net.underdesk.circolapp.server.curie
+
+import com.squareup.moshi.Moshi
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.withContext
+import net.underdesk.circolapp.data.Circular
+import net.underdesk.circolapp.server.Server
+import net.underdesk.circolapp.server.ServerAPI
+import net.underdesk.circolapp.server.curie.pojo.Response
+import okhttp3.OkHttpClient
+import okhttp3.Request
+import org.jsoup.Jsoup
+import java.io.IOException
+
+class CurieServer : Server() {
+    private val moshi = Moshi.Builder().build()
+    private val responseAdapter = moshi.adapter(Response::class.java)
+    private val client = OkHttpClient()
+
+    override suspend fun getCircularsFromServer(): Pair<List<Circular>, ServerAPI.Companion.Result> {
+        return try {
+            withContext(Dispatchers.Default) {
+                val json = retrieveDataFromServer()
+
+                val document = Jsoup.parseBodyFragment(json.content.rendered)
+                val htmlList = document.getElementsByTag("ul")[0].getElementsByTag("a")
+
+                val list = ArrayList<Circular>()
+
+                htmlList.forEach { element ->
+                    if (element.parents().size == 6) {
+                        list.last().attachmentsNames.add(element.text())
+                        list.last().attachmentsUrls.add(element.attr("href"))
+                    } else if (element.parents().size == 4) {
+                        list.add(Circular.generateFromString(element.text(), element.attr("href")))
+                    }
+                }
+                Pair(list, ServerAPI.Companion.Result.SUCCESS)
+            }
+        } catch (exception: IOException) {
+            Pair(emptyList(), ServerAPI.Companion.Result.ERROR)
+        }
+    }
+
+    override suspend fun newCircularsAvailable(): Pair<Boolean, ServerAPI.Companion.Result> {
+        return Pair(true, ServerAPI.Companion.Result.SUCCESS)
+    }
+
+    @Throws(IOException::class)
+    private suspend fun retrieveDataFromServer(): Response {
+        val request = Request.Builder()
+            .url(ENDPOINT_URL)
+            .build()
+
+        return withContext(Dispatchers.IO) {
+            val response = client.newCall(request).execute()
+
+            if (!response.isSuccessful) {
+                throw IOException("HTTP error code: ${response.code})")
+            }
+
+            responseAdapter.fromJson(
+                response.body!!.string()
+            )!!
+        }
+    }
+
+    companion object {
+        const val ENDPOINT_URL = "https://www.curiepinerolo.edu.it/wp-json/wp/v2/pages/5958"
+    }
+}

app/src/main/java/net/underdesk/circolapp/server/curie/pojo/Content.kt

@@ -1,4 +1,4 @@
-package net.underdesk.circolapp.server.pojo
+package net.underdesk.circolapp.server.curie.pojo
 
 import com.squareup.moshi.JsonClass
 

app/src/main/java/net/underdesk/circolapp/server/curie/pojo/Response.kt

@@ -1,4 +1,4 @@
-package net.underdesk.circolapp.server.pojo
+package net.underdesk.circolapp.server.curie.pojo
 
 import com.squareup.moshi.JsonClass
 

app/src/main/java/net/underdesk/circolapp/works/PollWork.kt

@@ -36,6 +36,7 @@ import net.underdesk.circolapp.R
 import net.underdesk.circolapp.data.AppDatabase
 import net.underdesk.circolapp.data.Circular
 import net.underdesk.circolapp.data.CircularRepository
+import net.underdesk.circolapp.server.ServerAPI
 import java.util.concurrent.TimeUnit
 
 class PollWork(appContext: Context, workerParams: WorkerParameters) :
@@ -85,7 +86,8 @@ class PollWork(appContext: Context, workerParams: WorkerParameters) :
 
     override suspend fun doWork(): Result = coroutineScope {
         val circularRepository = CircularRepository.getInstance(
-            AppDatabase.getInstance(applicationContext).circularDao()
+            AppDatabase.getInstance(applicationContext).circularDao(),
+            ServerAPI.getInstance(ServerAPI.Companion.Servers.CURIE)
         )
 
         val result = circularRepository.updateCirculars()