feat(geobase): property builder utility #138

dart/geobase/lib/src/utils/property_builder.dart

@@ -0,0 +1,44 @@
+// Copyright (c) 2020-2022 Navibyte (https://navibyte.com). All rights reserved.
+// Use of this source code is governed by a “BSD-3-Clause”-style license that is
+// specified in the LICENSE file.
+//
+// Docs: https://github.com/navibyte/geospatial
+
+import '/src/vector/content.dart';
+
+/// A builder to create property maps from [PropertyContent] stream.
+class PropertyBuilder with PropertyContent {
+  final Map<String, Object?> _map;
+
+  const PropertyBuilder._(this._map);
+
+  /// Builds a property map from the content stream provided by [properties].
+  /// 
+  /// Built property objects are sent into the [to] map (that is also returned).
+  static Map<String, Object?> buildTo(
+    WriteProperties properties, {
+    required Map<String, Object?> to,
+  }) {
+    final builder = PropertyBuilder._(to);
+    properties.call(builder);
+    return to;
+  }
+
+  /// Builds a property map from the content stream provided by [properties].
+  static Map<String, Object?> buildMap(WriteProperties properties) {
+    final map = <String, Object?>{};
+    final builder = PropertyBuilder._(map);
+    properties.call(builder);
+    return map;
+  }
+
+  @override
+  void properties(String name, Map<String, Object?> map) {
+    _map[name] = map;
+  }
+
+  @override
+  void property(String name, Object? value) {
+    _map[name] = value;
+  }
+}