Make map feature collection hardcoded

lib/models/map_features/map_feature_collection.dart

@@ -0,0 +1,63 @@
+import 'dart:collection';
+
+import 'package:flutter/material.dart';
+
+import '/models/osm_element_type.dart';
+import '/models/element_conditions/element_condition.dart';
+import '/models/element_conditions/sub_condition_matcher.dart';
+import '/models/element_conditions/tag_value_matcher.dart';
+import '/models/element_variants/base_element.dart';
+import 'map_feature_definition.dart';
+import 'map_feature_representation.dart';
+
+
+abstract final class MapFeatures {
+
+  /// Compare the elements of this Map Feature Collection with given OSM element
+  /// and return the best matching Map Feature Template.
+  ///
+  /// If not matching [MapFeatureDefinition] can be found a dummy [MapFeatureRepresentation] is returned.
+
+  static MapFeatureRepresentation getForElement (ProcessedElement osmElement) {
+    MapFeatureDefinition? bestMatch;
+    int score = 0;
+
+    for (final MapFeatureDefinition mapFeature in _list) {
+      final matchingCondition = mapFeature.matchesBy(osmElement);
+      if (matchingCondition != null) {
+        // Check if the newly matched map feature has more matching tags than the previously matched map feature
+        final newScore = _calcConditionScore(matchingCondition);
+        if (newScore > score) {
+          score = newScore;
+          bestMatch = mapFeature;
+        }
+      }
+    }
+
+    if (bestMatch != null) {
+      return bestMatch.resolve(osmElement);
+    }
+    else {
+      // construct dummy MapFeatureRepresentation
+      return MapFeatureRepresentation.fromElement(element: osmElement);
+    }
+  }
+
+  /// Calculate a simple score for a condition in order to prioritize one map feature over another.
+  /// Currently this only counts the number of tags the main tag condition has.
+
+  static int _calcConditionScore(ElementCondition condition) {
+    return condition.characteristics.fold<int>(0, (value, cond) {
+      if (cond is TagsSubCondition) return value + cond.characteristics.length;
+      return value;
+    });
+  }
+
+  static final UnmodifiableListView<MapFeatureDefinition> definitions = UnmodifiableListView(_list);
+
+  /// Defines all map features with their names, icons and conditions.
+  // TODO: make whole list const one day when https://github.com/dart-lang/language/issues/1048 is implemented
+  static final _list = <MapFeatureDefinition>[
+
+  ];
+}