Merge branch 'feature/add-uuid-column-formulaelements'

TODO.md

@@ -80,6 +80,10 @@
   - The "paste" button will copy the clipboard into the text editor.
   - A second button "import" will use the import preview screen
  -[R] Launch test app_test.dart. Iterate until the test pass.
-- [ ] Add a uuid column to the table or FormulaElements, so it is not necessary to load all the formulas to find a formula by uuid. This will improve performance when updating and deleting.
+- [R] Unify UUID and id of FormulaElement
-- [ ] Make formulaSolver() asyncronous, and show a CircularProgressIndicator while the formula is being solved. Honor a new optinal parameter "timeout" in formulaSolver, that will throw a TimeoutException.
+  - UUID is in memory
+  - id is in database
+  - remove id from database, add UUID to database
+- [ ] Solve exception in _CorpusLoaderState.build() when GetIt.instance.registerSingleton<Corpus>(corpus) after importing formula, since there is already registeted.  
 - [ ] When importing FormulaElements, save the FormulaElements in the database (currently, they are only added to the Corpus in memory).
+- [ ] Make formulaSolver() asyncronous, and show a CircularProgressIndicator while the formula is being solved. Honor a new optinal parameter "timeout" in formulaSolver, that will throw a TimeoutException.

flutterw

@@ -7,6 +7,8 @@ BUILDCACHE=./.build-container-cache
 DOCKERFILE=./docker/Dockerfile
 IMAGE=d4rt-formulas-builder
 
+ALL_ARGS="$@"
+
 detect_container_manager(){
 
     if [ "$DOCKER" != "" ]
@@ -18,6 +20,12 @@ detect_container_manager(){
     elif command -v docker > /dev/null 2>&1
     then     
         DOCKER=docker
+    elif [ -n "$DISTROBOX_HOST_HOME" ]
+    then
+        echo "Detected distrobox, as DISTROBOX_HOST_HOME is defined"
+        echo "Please try to run this script as: "
+        echo "  distrobox-host-exec $0 $ALL_ARGS"
+        exit 3
     else
         echo "Error: no container manager detected (like 'docker' or 'podman'), please define DOCKER variable"
         exit 2

lib/ai/import_preview_screen.dart

@@ -4,6 +4,7 @@ import 'package:d4rt_formulas/formula_models.dart';
 import 'package:d4rt_formulas/corpus.dart';
 import 'package:d4rt_formulas/ai/formula_editor.dart';
 import 'package:d4rt_formulas/services/import_service.dart';
+import 'package:d4rt_formulas/service_locator.dart';
 
 import 'package:flutter_code_editor/flutter_code_editor.dart';
 import 'package:flutter_highlight/themes/monokai-sublime.dart';
@@ -28,11 +29,7 @@ class _ImportPreviewScreenState extends State<ImportPreviewScreen> {
     super.initState();
     // Select all by default
     for (final element in widget.elements) {
-      if (element is Formula) {
       _selectedUuids.add(element.uuid);
-      } else if (element is UnitSpec) {
-        _selectedUuids.add(element.name);
-      }
     }
   }
 
@@ -59,14 +56,9 @@ class _ImportPreviewScreenState extends State<ImportPreviewScreen> {
     }
   }
 
-  void _importSelected() {
+  Future<void> _importSelected() async {
     final selectedElements = widget.elements.where((element) {
-      if (element is Formula) {
       return _selectedUuids.contains(element.uuid);
-      } else if (element is UnitSpec) {
-        return _selectedUuids.contains(element.name);
-      }
-      return false;
     }).toList();
 
     if (selectedElements.isEmpty) {
@@ -79,6 +71,17 @@ class _ImportPreviewScreenState extends State<ImportPreviewScreen> {
     try {
       widget.corpus.loadFormulaElements(selectedElements, true);
 
+      // Save imported elements to the database
+      final database = getDatabase();
+      for (final element in selectedElements) {
+        final existingElement = await database.getFormulaElementByUuid(element.uuid);
+        if (existingElement != null) {
+          await database.updateFormulaElement(element.uuid, element.toStringLiteral());
+        } else {
+          await database.insertFormulaElement(element.uuid, element.toStringLiteral());
+        }
+      }
+
       ScaffoldMessenger.of(context).showSnackBar(
         SnackBar(
           content: Text('Imported ${selectedElements.length} element(s) successfully'),
@@ -186,7 +189,7 @@ class _ImportPreviewScreenState extends State<ImportPreviewScreen> {
   }
 
   Widget _buildUnitTile(UnitSpec unit) {
-    final isSelected = _selectedUuids.contains(unit.name);
+    final isSelected = _selectedUuids.contains(unit.uuid);
 
     return Card(
       margin: const EdgeInsets.symmetric(horizontal: 8, vertical: 4),
@@ -196,9 +199,9 @@ class _ImportPreviewScreenState extends State<ImportPreviewScreen> {
           onChanged: (value) {
             setState(() {
               if (value == true) {
-                _selectedUuids.add(unit.name);
+                _selectedUuids.add(unit.uuid);
               } else {
-                _selectedUuids.remove(unit.name);
+                _selectedUuids.remove(unit.uuid);
               }
             });
           },

lib/database/database_service.dart

@@ -31,64 +31,39 @@ extension CorpusDatabaseExtension on FormulasDatabase {
     // Clear existing elements first
     await delete(formulaElements).go();
 
-    // Insert new elements
+    // Insert new elements with their UUIDs
     for (final element in elements) {
-      await insertFormulaElement(element.toStringLiteral());
+      await insertFormulaElement(element.uuid, element.toStringLiteral());
     }
   }
 
   // Method to update a formula in the database by UUID
   Future<bool> updateFormula(models.Formula formula) async {
-    final elements = await getAllFormulaElements();
+    final existingElement = await getFormulaElementByUuid(formula.uuid);
-
+    if (existingElement != null) {
-    for (final element in elements) {
+      await updateFormulaElement(formula.uuid, formula.toStringLiteral());
-      try {
-        final parsed = SetUtils.parseCorpusElements('[${element.elementText}]');
-        if (parsed.isNotEmpty && parsed.first is models.Formula) {
-          final existingFormula = parsed.first as models.Formula;
-          if (existingFormula.uuid == formula.uuid) {
-            // Update this element
-            await updateFormulaElement(
-              element.id,
-              formula.toStringLiteral()
-            );
       return true;
     }
-        }
+    return false;
-      } catch (e) {
-        print('Error parsing database element during update: $e');
-        continue;
-      }
-    }
-
-    return false; // Formula not found
   }
 
   // Method to add a new formula to the database
   Future<void> addFormula(models.Formula formula) async {
-    await insertFormulaElement(formula.toStringLiteral());
+    await insertFormulaElement(formula.uuid, formula.toStringLiteral());
   }
 
-  // Method to delete a formula from the database by name
+  // Method to add a new formula element (formula or unit) to the database
-  Future<bool> deleteFormula(String uuid) async {
+  Future<void> addFormulaElement(models.FormulaElement element) async {
-    final elements = await getAllFormulaElements();
+    await insertFormulaElement(element.uuid, element.toStringLiteral());
+  }
 
-    for (final element in elements) {
+  // Method to delete a formula from the database by UUID
-      try {
+  Future<bool> deleteFormula(String uuid) async {
-        final parsed = SetUtils.parseCorpusElements('[${element.elementText}]');
+    final existingElement = await getFormulaElementByUuid(uuid);
-        if (parsed.isNotEmpty && parsed.first is models.Formula) {
+    if (existingElement != null) {
-          final existingFormula = parsed.first as models.Formula;
+      await deleteFormulaElement(uuid);
-          if (existingFormula.uuid == uuid) {
-            await deleteFormulaElement(element.id);
       return true;
     }
-        }
+    return false;
-      } catch (e) {
-        print('Error parsing database element during delete: $e');
-        continue;
-      }
-    }
-    
-    return false; // Formula not found
   }
 }

lib/database/formulas_database.dart

@@ -7,10 +7,13 @@ if (dart.library.ffi) 'formulas_database_native.dart';
 
 part 'formulas_database.g.dart';
 
-// Define the FORMULAELEMENT table to store both formulas and units as text
+
 class FormulaElements extends Table {
-  IntColumn get id => integer().autoIncrement()();
+  TextColumn get uuid => text()();
   TextColumn get elementText => text()();
+
+  @override
+  Set<Column> get primaryKey => {uuid};
 }
 
 @DriftDatabase(tables: [FormulaElements])
@@ -21,8 +24,10 @@ class FormulasDatabase extends _$FormulasDatabase {
   int get schemaVersion => 1;
 
   // Method to insert a new formula element (either formula or unit)
-  Future<int> insertFormulaElement(String elementText) {
+  Future<void> insertFormulaElement(String uuid, String elementText) {
-    return into(formulaElements).insert(FormulaElementsCompanion.insert(elementText: elementText));
+    return into(formulaElements).insert(
+      FormulaElementsCompanion.insert(uuid: uuid, elementText: elementText),
+    );
   }
 
   // Method to get all formula elements
@@ -30,20 +35,20 @@ class FormulasDatabase extends _$FormulasDatabase {
     return select(formulaElements).get();
   }
 
-  // Method to get a formula element by ID
+  // Method to get a formula element by UUID
-  Future<FormulaElement?> getFormulaElementById(int id) {
+  Future<FormulaElement?> getFormulaElementByUuid(String uuid) {
-    return (select(formulaElements)..where((tbl) => tbl.id.equals(id))).getSingleOrNull();
+    return (select(formulaElements)..where((tbl) => tbl.uuid.equals(uuid))).getSingleOrNull();
   }
 
   // Method to update a formula element
-  Future<void> updateFormulaElement(int id, String newElementText) {
+  Future<void> updateFormulaElement(String uuid, String newElementText) {
-    return (update(formulaElements)..where((tbl) => tbl.id.equals(id)))
+    return (update(formulaElements)..where((tbl) => tbl.uuid.equals(uuid)))
-        .write(FormulaElementsCompanion.insert(elementText: newElementText));
+        .write(FormulaElementsCompanion(elementText: Value(newElementText)));
   }
 
   // Method to delete a formula element
-  Future<void> deleteFormulaElement(int id) {
+  Future<void> deleteFormulaElement(String uuid) {
-    return (delete(formulaElements)..where((tbl) => tbl.id.equals(id))).go();
+    return (delete(formulaElements)..where((tbl) => tbl.uuid.equals(uuid))).go();
   }
 
   // Additional helper methods for direct access to the table

lib/database/formulas_database.g.dart

@@ -9,18 +9,14 @@ class $FormulaElementsTable extends FormulaElements
   final GeneratedDatabase attachedDatabase;
   final String? _alias;
   $FormulaElementsTable(this.attachedDatabase, [this._alias]);
-  static const VerificationMeta _idMeta = const VerificationMeta('id');
+  static const VerificationMeta _uuidMeta = const VerificationMeta('uuid');
   @override
-  late final GeneratedColumn<int> id = GeneratedColumn<int>(
+  late final GeneratedColumn<String> uuid = GeneratedColumn<String>(
-    'id',
+    'uuid',
     aliasedName,
     false,
-    hasAutoIncrement: true,
+    type: DriftSqlType.string,
-    type: DriftSqlType.int,
+    requiredDuringInsert: true,
-    requiredDuringInsert: false,
-    defaultConstraints: GeneratedColumn.constraintIsAlways(
-      'PRIMARY KEY AUTOINCREMENT',
-    ),
   );
   static const VerificationMeta _elementTextMeta = const VerificationMeta(
     'elementText',
@@ -34,7 +30,7 @@ class $FormulaElementsTable extends FormulaElements
     requiredDuringInsert: true,
   );
   @override
-  List<GeneratedColumn> get $columns => [id, elementText];
+  List<GeneratedColumn> get $columns => [uuid, elementText];
   @override
   String get aliasedName => _alias ?? actualTableName;
   @override
@@ -47,8 +43,13 @@ class $FormulaElementsTable extends FormulaElements
   }) {
     final context = VerificationContext();
     final data = instance.toColumns(true);
-    if (data.containsKey('id')) {
+    if (data.containsKey('uuid')) {
-      context.handle(_idMeta, id.isAcceptableOrUnknown(data['id']!, _idMeta));
+      context.handle(
+        _uuidMeta,
+        uuid.isAcceptableOrUnknown(data['uuid']!, _uuidMeta),
+      );
+    } else if (isInserting) {
+      context.missing(_uuidMeta);
     }
     if (data.containsKey('element_text')) {
       context.handle(
@@ -65,14 +66,14 @@ class $FormulaElementsTable extends FormulaElements
   }
 
   @override
-  Set<GeneratedColumn> get $primaryKey => {id};
+  Set<GeneratedColumn> get $primaryKey => {uuid};
   @override
   FormulaElement map(Map<String, dynamic> data, {String? tablePrefix}) {
     final effectivePrefix = tablePrefix != null ? '$tablePrefix.' : '';
     return FormulaElement(
-      id: attachedDatabase.typeMapping.read(
+      uuid: attachedDatabase.typeMapping.read(
-        DriftSqlType.int,
+        DriftSqlType.string,
-        data['${effectivePrefix}id'],
+        data['${effectivePrefix}uuid'],
       )!,
       elementText: attachedDatabase.typeMapping.read(
         DriftSqlType.string,
@@ -88,20 +89,20 @@ class $FormulaElementsTable extends FormulaElements
 }
 
 class FormulaElement extends DataClass implements Insertable<FormulaElement> {
-  final int id;
+  final String uuid;
   final String elementText;
-  const FormulaElement({required this.id, required this.elementText});
+  const FormulaElement({required this.uuid, required this.elementText});
   @override
   Map<String, Expression> toColumns(bool nullToAbsent) {
     final map = <String, Expression>{};
-    map['id'] = Variable<int>(id);
+    map['uuid'] = Variable<String>(uuid);
     map['element_text'] = Variable<String>(elementText);
     return map;
   }
 
   FormulaElementsCompanion toCompanion(bool nullToAbsent) {
     return FormulaElementsCompanion(
-      id: Value(id),
+      uuid: Value(uuid),
       elementText: Value(elementText),
     );
   }
@@ -112,7 +113,7 @@ class FormulaElement extends DataClass implements Insertable<FormulaElement> {
   }) {
     serializer ??= driftRuntimeOptions.defaultSerializer;
     return FormulaElement(
-      id: serializer.fromJson<int>(json['id']),
+      uuid: serializer.fromJson<String>(json['uuid']),
       elementText: serializer.fromJson<String>(json['elementText']),
     );
   }
@@ -120,18 +121,19 @@ class FormulaElement extends DataClass implements Insertable<FormulaElement> {
   Map<String, dynamic> toJson({ValueSerializer? serializer}) {
     serializer ??= driftRuntimeOptions.defaultSerializer;
     return <String, dynamic>{
-      'id': serializer.toJson<int>(id),
+      'uuid': serializer.toJson<String>(uuid),
       'elementText': serializer.toJson<String>(elementText),
     };
   }
 
-  FormulaElement copyWith({int? id, String? elementText}) => FormulaElement(
+  FormulaElement copyWith({String? uuid, String? elementText}) =>
-    id: id ?? this.id,
+      FormulaElement(
+        uuid: uuid ?? this.uuid,
         elementText: elementText ?? this.elementText,
       );
   FormulaElement copyWithCompanion(FormulaElementsCompanion data) {
     return FormulaElement(
-      id: data.id.present ? data.id.value : this.id,
+      uuid: data.uuid.present ? data.uuid.value : this.uuid,
       elementText: data.elementText.present
           ? data.elementText.value
           : this.elementText,
@@ -141,70 +143,82 @@ class FormulaElement extends DataClass implements Insertable<FormulaElement> {
   @override
   String toString() {
     return (StringBuffer('FormulaElement(')
-          ..write('id: $id, ')
+          ..write('uuid: $uuid, ')
           ..write('elementText: $elementText')
           ..write(')'))
         .toString();
   }
 
   @override
-  int get hashCode => Object.hash(id, elementText);
+  int get hashCode => Object.hash(uuid, elementText);
   @override
   bool operator ==(Object other) =>
       identical(this, other) ||
       (other is FormulaElement &&
-          other.id == this.id &&
+          other.uuid == this.uuid &&
           other.elementText == this.elementText);
 }
 
 class FormulaElementsCompanion extends UpdateCompanion<FormulaElement> {
-  final Value<int> id;
+  final Value<String> uuid;
   final Value<String> elementText;
+  final Value<int> rowid;
   const FormulaElementsCompanion({
-    this.id = const Value.absent(),
+    this.uuid = const Value.absent(),
     this.elementText = const Value.absent(),
+    this.rowid = const Value.absent(),
   });
   FormulaElementsCompanion.insert({
-    this.id = const Value.absent(),
+    required String uuid,
     required String elementText,
-  }) : elementText = Value(elementText);
+    this.rowid = const Value.absent(),
+  }) : uuid = Value(uuid),
+       elementText = Value(elementText);
   static Insertable<FormulaElement> custom({
-    Expression<int>? id,
+    Expression<String>? uuid,
     Expression<String>? elementText,
+    Expression<int>? rowid,
   }) {
     return RawValuesInsertable({
-      if (id != null) 'id': id,
+      if (uuid != null) 'uuid': uuid,
       if (elementText != null) 'element_text': elementText,
+      if (rowid != null) 'rowid': rowid,
     });
   }
 
   FormulaElementsCompanion copyWith({
-    Value<int>? id,
+    Value<String>? uuid,
     Value<String>? elementText,
+    Value<int>? rowid,
   }) {
     return FormulaElementsCompanion(
-      id: id ?? this.id,
+      uuid: uuid ?? this.uuid,
       elementText: elementText ?? this.elementText,
+      rowid: rowid ?? this.rowid,
     );
   }
 
   @override
   Map<String, Expression> toColumns(bool nullToAbsent) {
     final map = <String, Expression>{};
-    if (id.present) {
+    if (uuid.present) {
-      map['id'] = Variable<int>(id.value);
+      map['uuid'] = Variable<String>(uuid.value);
     }
     if (elementText.present) {
       map['element_text'] = Variable<String>(elementText.value);
     }
+    if (rowid.present) {
+      map['rowid'] = Variable<int>(rowid.value);
+    }
     return map;
   }
 
   @override
   String toString() {
     return (StringBuffer('FormulaElementsCompanion(')
-          ..write('id: $id, ')
+          ..write('uuid: $uuid, ')
-          ..write('elementText: $elementText')
+          ..write('elementText: $elementText, ')
+          ..write('rowid: $rowid')
           ..write(')'))
         .toString();
   }
@@ -225,13 +239,15 @@ abstract class _$FormulasDatabase extends GeneratedDatabase {
 
 typedef $$FormulaElementsTableCreateCompanionBuilder =
     FormulaElementsCompanion Function({
-      Value<int> id,
+      required String uuid,
       required String elementText,
+      Value<int> rowid,
     });
 typedef $$FormulaElementsTableUpdateCompanionBuilder =
     FormulaElementsCompanion Function({
-      Value<int> id,
+      Value<String> uuid,
       Value<String> elementText,
+      Value<int> rowid,
     });
 
 class $$FormulaElementsTableFilterComposer
@@ -243,8 +259,8 @@ class $$FormulaElementsTableFilterComposer
     super.$addJoinBuilderToRootComposer,
     super.$removeJoinBuilderFromRootComposer,
   });
-  ColumnFilters<int> get id => $composableBuilder(
+  ColumnFilters<String> get uuid => $composableBuilder(
-    column: $table.id,
+    column: $table.uuid,
     builder: (column) => ColumnFilters(column),
   );
 
@@ -263,8 +279,8 @@ class $$FormulaElementsTableOrderingComposer
     super.$addJoinBuilderToRootComposer,
     super.$removeJoinBuilderFromRootComposer,
   });
-  ColumnOrderings<int> get id => $composableBuilder(
+  ColumnOrderings<String> get uuid => $composableBuilder(
-    column: $table.id,
+    column: $table.uuid,
     builder: (column) => ColumnOrderings(column),
   );
 
@@ -283,8 +299,8 @@ class $$FormulaElementsTableAnnotationComposer
     super.$addJoinBuilderToRootComposer,
     super.$removeJoinBuilderFromRootComposer,
   });
-  GeneratedColumn<int> get id =>
+  GeneratedColumn<String> get uuid =>
-      $composableBuilder(column: $table.id, builder: (column) => column);
+      $composableBuilder(column: $table.uuid, builder: (column) => column);
 
   GeneratedColumn<String> get elementText => $composableBuilder(
     column: $table.elementText,
@@ -329,16 +345,23 @@ class $$FormulaElementsTableTableManager
               $$FormulaElementsTableAnnotationComposer($db: db, $table: table),
           updateCompanionCallback:
               ({
-                Value<int> id = const Value.absent(),
+                Value<String> uuid = const Value.absent(),
                 Value<String> elementText = const Value.absent(),
-              }) => FormulaElementsCompanion(id: id, elementText: elementText),
+                Value<int> rowid = const Value.absent(),
+              }) => FormulaElementsCompanion(
+                uuid: uuid,
+                elementText: elementText,
+                rowid: rowid,
+              ),
           createCompanionCallback:
               ({
-                Value<int> id = const Value.absent(),
+                required String uuid,
                 required String elementText,
+                Value<int> rowid = const Value.absent(),
               }) => FormulaElementsCompanion.insert(
-                id: id,
+                uuid: uuid,
                 elementText: elementText,
+                rowid: rowid,
               ),
           withReferenceMapper: (p0) => p0
               .map((e) => (e.readTable(table), BaseReferences(db, table, e)))

lib/formula_models.dart

@@ -7,8 +7,12 @@ import 'package:uuid/uuid.dart';
 
 typedef Number = double;
 
+String _generateUuidV4() => Uuid().v4();
+
 /// Abstract base class for formula elements
 abstract class FormulaElement {
+  String get uuid;
+
   Map<String, dynamic> toMap();
 
   String toStringLiteral() {
@@ -18,6 +22,8 @@ abstract class FormulaElement {
 }
 
 class UnitSpec extends FormulaElement {
+  @override
+  final String uuid;
   final String name;
   final String baseUnit;
   final String symbol;
@@ -28,6 +34,7 @@ class UnitSpec extends FormulaElement {
   @override
   Map<String, dynamic> toMap() {
     return {
+      'uuid': uuid,
       "name": name,
       "baseUnit": baseUnit,
       "symbol": symbol,
@@ -38,32 +45,35 @@ class UnitSpec extends FormulaElement {
   }
 
   UnitSpec({
+    String? uuid,
     required this.name,
     required this.baseUnit,
     required this.symbol,
     this.factorFromUnitToBase,
     this.codeFromBaseToUnit,
     this.codeFromUnitToBase,
-  });
+  }) : uuid = uuid ?? _generateUuidV4();
 
   factory UnitSpec.fromSet(Map<Object?, Object?> theSet) {
+    String? uuid = theSet['uuid'] as String?;
     String name = SetUtils.stringValue(theSet, "name");
     String symbol = SetUtils.stringValue(theSet, "symbol");
 
     if (theSet.containsKey("isBase")) {
-      return UnitSpec(name: name, baseUnit: name, symbol: symbol, factorFromUnitToBase: 1);
+      return UnitSpec(uuid: uuid, name: name, baseUnit: name, symbol: symbol, factorFromUnitToBase: 1);
     }
 
     String baseUnit = SetUtils.stringValue(theSet, "baseUnit");
 
     if (theSet.containsKey("factor")) {
       Number factorFromUnitToBase = SetUtils.numberValue(theSet, "factor");
-      return UnitSpec(name: name, baseUnit: baseUnit, symbol: symbol, factorFromUnitToBase: factorFromUnitToBase);
+      return UnitSpec(uuid: uuid, name: name, baseUnit: baseUnit, symbol: symbol, factorFromUnitToBase: factorFromUnitToBase);
     } else if (theSet.containsKey("toBase")) {
       String codeFromBaseToUnit = SetUtils.stringValue(theSet, "fromBase");
       String codeFromUnitToBase = SetUtils.stringValue(theSet, "toBase");
 
       return UnitSpec(
+        uuid: uuid,
         name: name,
         baseUnit: baseUnit,
         symbol: symbol,
@@ -84,7 +94,7 @@ class UnitSpec extends FormulaElement {
   }
 }
 
-class VariableSpec extends FormulaElement {
+class VariableSpec{
   final String name;
   final String? unit;
   final List<dynamic>? values;
@@ -98,7 +108,7 @@ class VariableSpec extends FormulaElement {
     };
   }
 
-  VariableSpec({required this.name, this.unit, this.values}) {
+  VariableSpec({required this.name, this.unit, this.values}){
     validate();
   }
 
@@ -128,8 +138,6 @@ class VariableSpec extends FormulaElement {
   int get hashCode => Object.hash(unit, name, values != null ? const DeepCollectionEquality().hash(values!) : 0);
 }
 
-String _generateUuidV4() => Uuid().v4();
-
 abstract class FormulaInterface {
   String get uuid;