feature(mvp): Stage 2 - add initial model classes

composer.json

@@ -2,6 +2,9 @@
 	"name": "wordpress/wp-feature-notifications",
 	"description": "Notifications for WordPress (Feature Plugin)",
 	"type": "wordpress-plugin",
+	"require": {
+		"ext-json": "*"
+	},
 	"require-dev": {
 		"phpunit/phpunit": "^9.6",
 		"yoast/phpunit-polyfills": "1.0.5",

includes/helper/class-serde.php

@@ -0,0 +1,60 @@
+<?php
+/**
+ * Notifications API:Serde class
+ *
+ * @package wordpress/wp-feature-notifications
+ */
+
+namespace WP\Notifications\Helper;
+
+use DateTime;
+
+/**
+ * Class Serde
+ *
+ * SERialization and DEserialization helper static class.
+ */
+class Serde {
+
+	/**
+	 * Maybe serialize a DateTime as an ISO 8601 date string.
+	 *
+	 * @param DateTime|null $date The possible DateTime object to serialize.
+	 *
+	 * @return string|null Maybe an ISO 8601 date string.
+	 */
+	public static function maybe_serialize_json_date( $date ) {
+		if ( null === $date ) {
+			return null;
+		}
+
+		return $date->format( DateTime::ATOM );
+	}
+
+	/**
+	 * Maybe deserialize a datetime string in MySQL format.
+	 *
+	 * @param string|DateTime|null $date The possible MySQL datetime to deserialize.
+	 *
+	 * @return DateTime|null Maybe a DateTime object.
+	 */
+	public static function maybe_deserialize_mysql_date( $date ) {
+		if ( null === $date ) {
+			return null;
+		}
+
+		if ( $date instanceof DateTime ) {
+			return $date;
+		}
+
+		if ( is_string( $date ) ) {
+			$date = DateTime::createFromFormat( 'Y-m-d H:i:s', $date );
+
+			if ( false === $date ) {
+				$date = null;
+			}
+		}
+
+		return $date;
+	}
+}

includes/model/class-channel.php

@@ -0,0 +1,141 @@
+<?php
+/**
+ * Notifications API:Channel class
+ *
+ * @package wordpress/wp-feature-notifications
+ */
+
+namespace WP\Notifications\Model;
+
+use JsonSerializable;
+
+/**
+ * Class representing a notification channel.
+ *
+ * @see \WP\Notifications\register_channel()
+ */
+class Channel implements JsonSerializable {
+
+	// Required properties
+
+	/**
+	 * Name, including namespace, of the channel.
+	 */
+	protected ?string $name;
+
+	/**
+	 * Human-readable label of the channel.
+	 */
+	protected ?string $title;
+
+	// Optional properties
+
+	/**
+	 * Display context of the channel.
+	 */
+	protected ?string $context;
+
+	/**
+	 * Detailed description of the channel.
+	 */
+	protected ?string $description;
+
+	/**
+	 * Icon of the channel.
+	 */
+	protected ?string $icon;
+
+	/**
+	 * Constructor.
+	 *
+	 * Instantiates a Channel object.
+	 *
+	 * @see register_channel()
+	 *
+	 * @param ?string $name        Name, including namespace, of the channel.
+	 * @param ?string $title       Human-readable label of the channel.
+	 * @param ?string $context     Optional default display context of the channel.
+	 * @param ?string $description Optional detailed description of the channel.
+	 * @param ?string $icon        Optional icon of the channel.
+	 *
+	 */
+	public function __construct(
+		$name = null,
+		$title = null,
+		$context = null,
+		$description = null,
+		$icon = null
+		) {
+		// Required properties
+
+		$this->name  = $name;
+		$this->title = $title;
+
+		// Optional properties
+
+		$this->context     = $context;
+		$this->icon        = $icon;
+		$this->description = $description;
+	}
+
+	/**
+	 * Specifies data which should be serialized to JSON.
+	 *
+	 * @return array Data which can be serialized by json_encode, which is a
+	 *               value of any type other than a resource.
+	 */
+	public function jsonSerialize() {
+		return array(
+			'context'     => $this->context,
+			'description' => $this->description,
+			'icon'        => $this->icon,
+			'name'        => $this->name,
+			'title'       => $this->title,
+		);
+	}
+
+	/**
+	 * Get the namespaced name.
+	 *
+	 * @return ?string The namespaced name of the channel.
+	 */
+	public function get_name(): ?string {
+		return $this->name;
+	}
+
+	/**
+	 * Get the human-readable label.
+	 *
+	 * @return ?string The title of the channel.
+	 */
+	public function get_title(): ?string {
+		return $this->title;
+	}
+
+	/**
+	 * Get the default display context.
+	 *
+	 * @return ?string The context of the channel.
+	 */
+	public function get_context(): ?string {
+		return $this->context;
+	}
+
+	/**
+	 * Get the detailed description.
+	 *
+	 * @return ?string The description of the channel.
+	 */
+	public function get_description(): ?string {
+		return $this->description;
+	}
+
+	/**
+	 * Get the icon.
+	 *
+	 * @return ?string The icon of the channel.
+	 */
+	public function get_icon(): ?string {
+		return $this->icon;
+	}
+}