lots of improvements

shared/lib/Resource/Delta/Delta.php

@@ -0,0 +1,45 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: Sebastian Krupinski <krupinski01@gmail.com>
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace KTXF\Resource\Delta;
+
+use KTXF\Json\JsonSerializable;
+
+class Delta implements JsonSerializable {
+
+	public function __construct(
+		public ?DeltaCollection $additions = null,
+		public ?DeltaCollection $modifications = null,
+		public ?DeltaCollection $deletions = null,
+		public ?string $signature = null,
+	) {
+		if ($this->additions === null) {
+			$this->additions = new DeltaCollection;
+		}
+		if ($this->modifications === null) {
+			$this->modifications = new DeltaCollection;
+		}
+		if ($this->deletions === null) {
+			$this->deletions = new DeltaCollection;
+		}
+		if ($this->signature === null) {
+			$this->signature = '';
+		}
+	}
+
+	public function jsonSerialize(): array {
+		return [
+			'signature' => $this->signature,
+			'additions' => $this->additions,
+			'modifications' => $this->modifications,
+			'deletions' => $this->deletions,
+		];
+	}
+
+}