first commit

wp-content/plugins/wpml-media-translation/classes/media-usage/class-wpml-media-usage.php

@@ -0,0 +1,55 @@
+<?php
+
+class WPML_Media_Usage {
+
+	const FIELD_NAME = '_wpml_media_usage';
+
+	/**
+	 * @var int
+	 */
+	private $attachment_id;
+	/**
+	 * @var array
+	 */
+	private $usage;
+
+	/**
+	 * @param int $attachment_id
+	 */
+	public function __construct( $attachment_id ) {
+		$this->attachment_id = $attachment_id;
+
+		$usage       = get_post_meta( $this->attachment_id, self::FIELD_NAME, true );
+		$this->usage = empty( $usage ) ? array() : $usage;
+	}
+
+	/**
+	 * @return array
+	 */
+	public function get_posts() {
+		return empty( $this->usage['posts'] ) ? array() : $this->usage['posts'];
+	}
+
+	/**
+	 * @param int $post_id
+	 */
+	public function add_post( $post_id ) {
+		$posts                = $this->get_posts();
+		$posts[]              = $post_id;
+		$this->usage['posts'] = array_unique( $posts );
+		$this->update_usage();
+	}
+
+	/**
+	 * @param int $post_id
+	 */
+	public function remove_post( $post_id ) {
+		$this->usage['posts'] = array_values( array_diff( (array) $this->usage['posts'], array( $post_id ) ) );
+		$this->update_usage();
+	}
+
+	private function update_usage() {
+		update_post_meta( $this->attachment_id, self::FIELD_NAME, $this->usage );
+	}
+
+}