Pagination for file listing

Fixes #41: Pagination implemented in file listing

Author: lakshya-20

app/src/main/java/com/github/code/gambit/data/remote/responses/ListResponse.kt

@@ -19,7 +19,7 @@ class BodyTemplate<T>(
     @Expose
     var items: List<T>,
 
-    @SerializedName("lastEvaluatedKey")
+    @SerializedName("LastEvaluatedKey")
     @Expose
-    var lastEvaluatedKey: String
+    var lastEvaluatedKey: String?
 )

app/src/main/java/com/github/code/gambit/data/remote/services/ApiService.kt

@@ -12,40 +12,41 @@ import retrofit2.http.GET
 import retrofit2.http.POST
 import retrofit2.http.PUT
 import retrofit2.http.Path
+import retrofit2.http.Query
 
 interface ApiService {
 
-    @GET("user/{userId}")
+    @GET("user/{${AppConstant.API_PATH.USER_ID}}")
     suspend fun getUser(@Path("userId") userId: String): Response<UserNetworkEntity>
 
-    @PUT("user/{userId}")
+    @PUT("user/{${AppConstant.API_PATH.USER_ID}}")
     suspend fun updateUser(@Path("userId") userId: String, @Body userNetworkEntity: UserNetworkEntity): Response<UserNetworkEntity>
 
-    @DELETE("user/{userId}")
+    @DELETE("user/{${AppConstant.API_PATH.USER_ID}}")
     suspend fun deleteUser(@Path("userId") userId: String): Response<UserNetworkEntity>
 
-    @GET("user/{userId}/file")
-    suspend fun getFiles(@Path("userId") userId: String): ListResponse<FileNetworkEntity>
+    @GET("user/{${AppConstant.API_PATH.USER_ID}}/file")
+    suspend fun getFiles(@Path("userId") userId: String, @Query(AppConstant.API_QUERY.FILE_LEK) lastEvalKey: String?): ListResponse<FileNetworkEntity>
 
-    @POST("user/{userId}/file")
+    @POST("user/{${AppConstant.API_PATH.USER_ID}}/file")
     suspend fun uploadFiles(@Path("userId") userId: String, @Body fileNetworkEntity: FileNetworkEntity): Response<FileNetworkEntity>
 
-    @DELETE("user/{userId}/file/{fileId}")
+    @DELETE("user/{${AppConstant.API_PATH.USER_ID}}/file/{${AppConstant.API_PATH.FILE_ID}}")
     suspend fun deleteFile(@Path(AppConstant.API_PATH.USER_ID) userId: String, @Path(AppConstant.API_PATH.FILE_ID) fileId: String): Response<FileNetworkEntity>
 
-    @GET("file/{fileId}/url")
+    @GET("file/{${AppConstant.API_PATH.FILE_ID}}/url")
     suspend fun getUrls(@Path(AppConstant.API_PATH.FILE_ID) fileId: String): ListResponse<UrlNetworkEntity>
 
-    @POST("file/{fileId}/url")
+    @POST("file/{${AppConstant.API_PATH.FILE_ID}}/url")
     suspend fun generateUrl(@Path(AppConstant.API_PATH.FILE_ID) fileId: String): Response<UrlNetworkEntity>
 
-    @PUT("file/{fileId}/url/{urlId}")
+    @PUT("file/{${AppConstant.API_PATH.FILE_ID}}/url/{${AppConstant.API_PATH.URL_ID}}")
     suspend fun updateUrl(
         @Path(AppConstant.API_PATH.FILE_ID) fileId: String,
         @Path(AppConstant.API_PATH.URL_ID) urlId: String,
         @Body urlNetworkEntity: UrlNetworkEntity
     ): Response<UrlNetworkEntity>
 
-    @DELETE("file/{fileId}/url/{urlId}")
+    @DELETE("file/{${AppConstant.API_PATH.FILE_ID}}/url/{${AppConstant.API_PATH.URL_ID}}")
     suspend fun deleteUrl(@Path(AppConstant.API_PATH.FILE_ID) fileId: String, @Path(AppConstant.API_PATH.URL_ID) urlId: String): Response<UrlNetworkEntity>
 }

app/src/main/java/com/github/code/gambit/data/remote/services/file/FileServiceImpl.kt

@@ -12,7 +12,13 @@ class FileServiceImpl(
     private val userId get() = userManager.getUserId()
 
     override suspend fun getFiles(): List<FileNetworkEntity> {
-        return apiService.getFiles(userId).body.items
+        var lek: String? = userManager.getFileLastEvaluatedKey()
+        if (lek == "") {
+            lek = null
+        }
+        val listResponse = apiService.getFiles(userId, lek)
+        userManager.putFileLastEvaluatedKey(listResponse.body.lastEvaluatedKey)
+        return listResponse.body.items
     }
 
     override suspend fun uploadFile(fileNetworkEntity: FileNetworkEntity): FileNetworkEntity {

app/src/main/java/com/github/code/gambit/utility/AppConstant.kt

@@ -30,6 +30,10 @@ object AppConstant {
         const val URL_ID = "urlId"
     }
 
+    object API_QUERY {
+        const val FILE_LEK = "LastEvaluatedKey"
+    }
+
     object Worker {
         const val FILE_URI_KEY = "FILE_URI"
         const val FILE_NAME_KEY = "FILE_NAME"

app/src/main/java/com/github/code/gambit/utility/sharedpreference/PreferenceManager.kt

@@ -11,7 +11,7 @@ abstract class PreferenceManager(var context: Context) {
     val pref: SharedPreferences = context.getSharedPreferences(prefName, Context.MODE_PRIVATE)
     private val editor: SharedPreferences.Editor get() = pref.edit()
 
-    fun <T> put(key: Key, value: T) {
+    fun <T> put(key: Key, value: T?) {
         when (value) {
             is String -> {
                 editor.putString(key.value, value).apply()
@@ -48,7 +48,6 @@ enum class Key(val value: String) {
     AUTHSTATE("IS-AUTHENTICATED"),
     EMAIL("EMAIL"),
     USER("USER"),
-    USERID("USER-ID"),
-    USERNAME("USER-NAME"),
-    TOKEN("ID-TOKEN")
+    TOKEN("ID-TOKEN"),
+    FILE_LEK("FILE-LAST-EVALUATED-KEY")
 }

app/src/main/java/com/github/code/gambit/utility/sharedpreference/UserManager.kt

@@ -7,6 +7,10 @@ import dagger.hilt.android.qualifiers.ApplicationContext
 class UserManager
 constructor(@ApplicationContext context: Context) : PreferenceManager(context) {
 
+    fun putFileLastEvaluatedKey(lastEvaluatedKey: String?) = put(Key.FILE_LEK, lastEvaluatedKey)
+
+    fun getFileLastEvaluatedKey() = get<String>(Key.FILE_LEK)
+
     fun setAuthenticated(value: Boolean) = put(Key.AUTHSTATE, value)
 
     private fun setUserEmail(email: String) = put(Key.EMAIL, email)