REST: Create StatementUpdater interface

Bug: T342886
Change-Id: I3d3e802c618f38b9ab0c9513ce2940e647fb5da8

repo/rest-api/src/Domain/ReadModel/StatementRevision.php

@@ -0,0 +1,34 @@
+<?php declare( strict_types=1 );
+
+namespace Wikibase\Repo\RestApi\Domain\ReadModel;
+
+/**
+ * @license GPL-2.0-or-later
+ */
+class StatementRevision {
+
+	private Statement $statement;
+	/**
+	 * @var string timestamp in MediaWiki format 'YYYYMMDDhhmmss'
+	 */
+	private string $lastModified;
+	private int $revisionId;
+
+	public function __construct( Statement $statement, string $lastModified, int $revisionId ) {
+		$this->statement = $statement;
+		$this->lastModified = $lastModified;
+		$this->revisionId = $revisionId;
+	}
+
+	public function getStatement(): Statement {
+		return $this->statement;
+	}
+
+	public function getLastModified(): string {
+		return $this->lastModified;
+	}
+
+	public function getRevisionId(): int {
+		return $this->revisionId;
+	}
+}

repo/rest-api/src/Domain/Services/StatementUpdater.php

@@ -0,0 +1,16 @@
+<?php declare( strict_types=1 );
+
+namespace Wikibase\Repo\RestApi\Domain\Services;
+
+use Wikibase\DataModel\Statement\Statement;
+use Wikibase\Repo\RestApi\Domain\Model\EditMetadata;
+use Wikibase\Repo\RestApi\Domain\ReadModel\StatementRevision;
+
+/**
+ * @license GPL-2.0-or-later
+ */
+interface StatementUpdater {
+
+	public function update( Statement $statement, EditMetadata $editMetadata ): StatementRevision;
+
+}