Support retrieving account data whose key starts with a string.

matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/session/accountdata/SessionAccountDataService.kt

@@ -63,4 +63,17 @@ interface SessionAccountDataService {
      * Update the account data with the provided type and the provided account data content.
      */
     suspend fun updateUserAccountData(type: String, content: Content)
+
+    /**
+     * Retrieve user account data list whose type starts with the given type.
+     * @param type the type or the starting part of a type
+     * @return list of account data whose type starts with the given type
+     */
+    fun getUserAccountDataEventsStartWith(type: String): List<UserAccountDataEvent>
+
+    /**
+     * Deletes user account data of the given type.
+     * @param type the type to delete from user account data
+     */
+    suspend fun deleteUserAccountData(type: String)
 }

matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/user/accountdata/UserAccountDataDataSource.kt

@@ -60,6 +60,16 @@ internal class UserAccountDataDataSource @Inject constructor(
         )
     }
 
+    fun getAccountDataEventsStartWith(type: String): List<UserAccountDataEvent> {
+        return realmSessionProvider.withRealm { realm ->
+            realm
+                    .where(UserAccountDataEntity::class.java)
+                    .contains(UserAccountDataEntityFields.TYPE, type)
+                    .findAll()
+                    .map(accountDataMapper::map)
+        }
+    }
+
     private fun accountDataEventsQuery(realm: Realm, types: Set<String>): RealmQuery<UserAccountDataEntity> {
         val query = realm.where(UserAccountDataEntity::class.java)
         if (types.isNotEmpty()) {