Define model for a collection

lib/models/collection.dart

@@ -0,0 +1,130 @@
+import 'dart:convert';
+
+import 'package:flutter/foundation.dart';
+
+class Collection {
+  final int id;
+  final int ownerID;
+  final String encryptedKey;
+  final String keyDecryptionNonce;
+  final String name;
+  final CollectionType type;
+  final Map<String, dynamic> attributes;
+  final List<String> sharees;
+
+  Collection(
+    this.id,
+    this.ownerID,
+    this.encryptedKey,
+    this.keyDecryptionNonce,
+    this.name,
+    this.type,
+    this.attributes,
+    this.sharees,
+  );
+
+  static Collection emptyCollection() {
+    return Collection(null, null, null, null, null, null, null, null);
+  }
+
+  Collection copyWith({
+    int id,
+    int ownerID,
+    String encryptedKey,
+    String keyDecryptionNonce,
+    String name,
+    CollectionType type,
+    Map<String, dynamic> attributes,
+    List<String> sharees,
+  }) {
+    return Collection(
+      id ?? this.id,
+      ownerID ?? this.ownerID,
+      encryptedKey ?? this.encryptedKey,
+      keyDecryptionNonce ?? this.keyDecryptionNonce,
+      name ?? this.name,
+      type ?? this.type,
+      attributes ?? this.attributes,
+      sharees ?? this.sharees,
+    );
+  }
+
+  Map<String, dynamic> toMap() {
+    return {
+      'id': id,
+      'ownerID': ownerID,
+      'encryptedKey': encryptedKey,
+      'keyDecryptionNonce': keyDecryptionNonce,
+      'name': name,
+      'type': type.toString(),
+      'attributes': attributes,
+      'sharees': sharees,
+    };
+  }
+
+  factory Collection.fromMap(Map<String, dynamic> map) {
+    if (map == null) return null;
+
+    return Collection(
+      map['id'],
+      map['ownerID'],
+      map['encryptedKey'],
+      map['keyDecryptionNonce'],
+      map['name'],
+      fromString(map['type']),
+      Map<String, dynamic>.from(map['attributes']),
+      List<String>.from(map['sharees']),
+    );
+  }
+
+  String toJson() => json.encode(toMap());
+
+  factory Collection.fromJson(String source) =>
+      Collection.fromMap(json.decode(source));
+
+  @override
+  String toString() {
+    return 'Collection(id: $id, ownerID: $ownerID, encryptedKey: $encryptedKey, keyDecryptionNonce: $keyDecryptionNonce, name: $name, type: $type, attributes: $attributes, sharees: $sharees)';
+  }
+
+  @override
+  bool operator ==(Object o) {
+    if (identical(this, o)) return true;
+
+    return o is Collection &&
+        o.id == id &&
+        o.ownerID == ownerID &&
+        o.encryptedKey == encryptedKey &&
+        o.keyDecryptionNonce == keyDecryptionNonce &&
+        o.name == name &&
+        o.type == type &&
+        mapEquals(o.attributes, attributes);
+  }
+
+  @override
+  int get hashCode {
+    return id.hashCode ^
+        ownerID.hashCode ^
+        encryptedKey.hashCode ^
+        keyDecryptionNonce.hashCode ^
+        name.hashCode ^
+        type.hashCode ^
+        attributes.hashCode;
+  }
+}
+
+CollectionType fromString(String type) {
+  switch (type) {
+    case "folder":
+      return CollectionType.folder;
+    case "favorites":
+      return CollectionType.favorites;
+  }
+  return CollectionType.album;
+}
+
+enum CollectionType {
+  folder,
+  favorites,
+  album,
+}