Added a toJSON constructor to the Workflow.

Author: zinigor

lib/src/workflow.dart

@@ -1,84 +1,45 @@
-import 'dart:convert';
 import 'workflow/node.dart';
 
 class Workflow{
-  final Map<String, dynamic> _json;
-  Workflow() : _json = jsonDecode(documentJson);
-
-  int get lastNodeId {
-    if (_json case {'last_node_id': int lastNodeId}) {
-      return lastNodeId;
-    } else {
-      throw const FormatException('Unexpected JSON');
-    }
-  }
-
-  int get lastLinkId {
-    if (_json case {'last_link_id': int lastLinkId}) {
-      return lastLinkId;
-    } else {
-      throw const FormatException('Unexpected JSON');
-    }
-  }
-
-  List<dynamic> get nodes {
-    if (_json case {'nodes': List<dynamic> nodes}) {
-      return nodes.map((node) => WorkflowNode.fromJSON(node)).toList();
-    } else {
-      throw const FormatException('Unexpected JSON');
-    }
-  }
-
-  List<dynamic> get links {
-    if (_json case {'links': List<dynamic> links}) {
-      return links;
-    } else {
-      throw const FormatException('Unexpected JSON');
-    }
-  }
-
-  List<dynamic> get groups {
-    if (_json case {'groups': List<dynamic> links}) {
-      return links;
-    } else {
-      throw const FormatException('Unexpected JSON');
-    }
+  final int lastNodeId;
+  final int lastLinkId;
+  final List<WorkflowNode> nodes;
+  final Set<dynamic> links;
+  final List<dynamic> groups;
+  final Map config;
+  final Map<String, dynamic> extra;
+  final String version;
+
+  Workflow(
+    this.lastNodeId,
+    this.lastLinkId,
+    this.nodes,
+    this.links,
+    this.groups,
+    this.config,
+    this.extra,
+    this.version
+  );
+
+  factory Workflow.fromJSON( Map<String, dynamic> _json) {
+    final lastNodeId = _json['last_node_id'] as int;
+    final lastLinkId = _json['last_link_id'] as int;
+    final nodes = _json['nodes'].map<WorkflowNode>((node) => WorkflowNode.fromJSON(node)).toList();
+    final links = _json['links'].map((prop) => prop is String ? prop as int : prop as String).toSet();
+    final groups = _json['groups'].map((group) => group as Map<String, dynamic>).toList() as List<dynamic>;
+    final config = _json['config'] as Map;
+    final extra = _json['extra'] as Map<String, dynamic>;
+    final version = "${_json['version']}";
+
+    return Workflow(
+      lastNodeId,
+      lastLinkId,
+      nodes,
+      links,
+      groups,
+      config,
+      extra,
+      version
+    );
   }
-
-  Map get config {
-    if (_json case {'config': Map config}) {
-      return config;
-    } else {
-      throw const FormatException('Unexpected JSON');
-    }
-  }
-
-  List<dynamic> get extra {
-    if (_json case {'extra': List<dynamic> extra}) {
-      return extra;
-    } else {
-      throw const FormatException('Unexpected JSON');
-    }
-  }
-
-  String get version {
-    if (_json case {'version': String version}) {
-      return version;
-    } else {
-      throw const FormatException('Unexpected JSON');
-    }
-  }
-}
-
-const documentJson = '''
-{
-  "last_node_id": 1,
-  "last_link_id": 1,
-  "nodes": [],
-  "links": [],
-  "groups": [],
-  "config": {},
-  "extra": {},
-  "version": 0.4
 }
-''';