Migrated recentlanguages and repository module from Java to Kotlin

app/src/main/java/fr/free/nrw/commons/recentlanguages/RecentLanguagesContentProvider.kt

@@ -0,0 +1,142 @@
+package fr.free.nrw.commons.recentlanguages
+
+
+import android.content.ContentValues
+import android.database.Cursor
+import android.database.sqlite.SQLiteDatabase
+import android.database.sqlite.SQLiteQueryBuilder
+import android.net.Uri
+import android.text.TextUtils
+import fr.free.nrw.commons.BuildConfig
+import fr.free.nrw.commons.data.DBOpenHelper
+import fr.free.nrw.commons.di.CommonsDaggerContentProvider
+import fr.free.nrw.commons.recentlanguages.RecentLanguagesDao.Table.COLUMN_NAME
+import fr.free.nrw.commons.recentlanguages.RecentLanguagesDao.Table.TABLE_NAME
+import javax.inject.Inject
+import timber.log.Timber
+
+
+/**
+ * Content provider of recently used languages
+ */
+class RecentLanguagesContentProvider : CommonsDaggerContentProvider() {
+
+    companion object {
+        private const val BASE_PATH = "recent_languages"
+        val BASE_URI: Uri =
+            Uri.parse(
+                "content://${BuildConfig.RECENT_LANGUAGE_AUTHORITY}/$BASE_PATH"
+            )
+
+        /**
+         * Append language code to the base URI
+         * @param languageCode Code of a language
+         */
+        @JvmStatic
+        fun uriForCode(languageCode: String): Uri {
+            return Uri.parse("$BASE_URI/$languageCode")
+        }
+    }
+
+    @Inject
+    lateinit var dbOpenHelper: DBOpenHelper
+
+    override fun getType(uri: Uri): String? {
+        return null
+    }
+
+    /**
+     * Queries the SQLite database for the recently used languages
+     * @param uri : contains the URI for recently used languages
+     * @param projection : contains all fields of the table
+     * @param selection : handles WHERE
+     * @param selectionArgs : the condition of WHERE clause
+     * @param sortOrder : ascending or descending
+     */
+    override fun query(
+        uri: Uri,
+        projection: Array<String>?,
+        selection: String?,
+        selectionArgs: Array<String>?,
+        sortOrder: String?
+    ): Cursor? {
+        val queryBuilder = SQLiteQueryBuilder()
+        queryBuilder.tables = TABLE_NAME
+        val db = dbOpenHelper.readableDatabase
+        val cursor = queryBuilder.query(
+            db,
+            projection,
+            selection,
+            selectionArgs,
+            null,
+            null,
+            sortOrder
+        )
+        cursor.setNotificationUri(context?.contentResolver, uri)
+        return cursor
+    }
+
+    /**
+     * Handles the update query of local SQLite Database
+     * @param uri : contains the URI for recently used languages
+     * @param contentValues : new values to be entered to the database
+     * @param selection : handles WHERE
+     * @param selectionArgs : the condition of WHERE clause
+     */
+    override fun update(
+        uri: Uri,
+        contentValues: ContentValues?,
+        selection: String?,
+        selectionArgs: Array<String>?
+    ): Int {
+        val sqlDB = dbOpenHelper.writableDatabase
+        val rowsUpdated: Int
+        if (selection.isNullOrEmpty()) {
+            val id = uri.lastPathSegment?.toInt()
+                ?: throw IllegalArgumentException("Invalid URI: $uri")
+            rowsUpdated = sqlDB.update(
+                TABLE_NAME,
+                contentValues,
+                "$COLUMN_NAME = ?",
+                arrayOf(id.toString())
+            )
+        } else {
+            throw IllegalArgumentException("Parameter `selection` should be empty when updating an ID")
+        }
+
+        context?.contentResolver?.notifyChange(uri, null)
+        return rowsUpdated
+    }
+
+    /**
+     * Handles the insertion of new recently used languages record to local SQLite Database
+     * @param uri : contains the URI for recently used languages
+     * @param contentValues : new values to be entered to the database
+     */
+    override fun insert(uri: Uri, contentValues: ContentValues?): Uri? {
+        val sqlDB = dbOpenHelper.writableDatabase
+        val id = sqlDB.insert(
+            TABLE_NAME,
+            null,
+            contentValues
+        )
+        context?.contentResolver?.notifyChange(uri, null)
+        return Uri.parse("$BASE_URI/$id")
+    }
+
+    /**
+     * Handles the deletion of a recently used languages record from local SQLite Database
+     * @param uri : contains the URI for recently used languages
+     */
+    override fun delete(uri: Uri, s: String?, strings: Array<String>?): Int {
+        val db = dbOpenHelper.readableDatabase
+        Timber.d("Deleting recently used language %s", uri.lastPathSegment)
+        val rows = db.delete(
+            TABLE_NAME,
+            "language_code = ?",
+            arrayOf(uri.lastPathSegment)
+        )
+        context?.contentResolver?.notifyChange(uri, null)
+        return rows
+    }
+}