Implement network-specific metadata handling in commands.

src/Network_Meta_Command.php

@@ -15,4 +15,90 @@
  */
 class Network_Meta_Command extends CommandWithMeta {
 	protected $meta_type = 'site';
+
+	/**
+	 * Override add_metadata() to use add_network_option() if available.
+	 *
+	 * @param int    $object_id  ID of the object the metadata is for.
+	 * @param string $meta_key   Metadata key to use.
+	 * @param mixed  $meta_value Metadata value. Must be serializable if
+	 *                           non-scalar.
+	 * @param bool   $unique     Optional, default is false. Whether the
+	 *                           specified metadata key should be unique for the
+	 *                           object. If true, and the object already has a
+	 *                           value for the specified metadata key, no change
+	 *                           will be made.
+	 *
+	 * @return int|false The meta ID on success, false on failure.
+	 */
+	protected function add_metadata( $object_id, $meta_key, $meta_value, $unique = false ) {
+		if ( function_exists( 'add_network_option' ) && $unique ) {
+			return add_network_option( $object_id, $meta_key, $meta_value );
+		}
+		return add_metadata( $this->meta_type, $object_id, $meta_key, $meta_value, $unique );
+	}
+
+	/**
+	 * Override update_metadata() to use update_network_option() if available.
+	 *
+	 * @param int    $object_id  ID of the object the metadata is for.
+	 * @param string $meta_key   Metadata key to use.
+	 * @param mixed  $meta_value Metadata value. Must be serializable if
+	 *                           non-scalar.
+	 * @param mixed  $prev_value Optional. If specified, only update existing
+	 *                           metadata entries with the specified value.
+	 *                           Otherwise, update all entries.
+	 *
+	 * @return int|bool Meta ID if the key didn't exist, true on successful
+	 *                  update, false on failure.
+	 */
+	protected function update_metadata( $object_id, $meta_key, $meta_value, $prev_value = '' ) {
+		if ( function_exists( 'update_network_option' ) && '' === $prev_value ) {
+			return update_network_option( $object_id, $meta_key, $meta_value );
+		}
+		return update_metadata( $this->meta_type, $object_id, $meta_key, $meta_value, $prev_value );
+	}
+
+	/**
+	 * Override get_metadata() to use get_network_option() if available.
+	 *
+	 * @param int    $object_id ID of the object the metadata is for.
+	 * @param string $meta_key  Optional. Metadata key. If not specified,
+	 *                          retrieve all metadata for the specified object.
+	 * @param bool   $single    Optional, default is false. If true, return only
+	 *                          the first value of the specified meta_key. This
+	 *                          parameter has no effect if meta_key is not
+	 *                          specified.
+	 *
+	 * @return mixed Single metadata value, or array of values.
+	 */
+	protected function get_metadata( $object_id, $meta_key = '', $single = false ) {
+		if ( function_exists( 'get_network_option' ) && '' !== $meta_key && $single ) {
+			return get_network_option( $object_id, $meta_key );
+		}
+		return get_metadata( $this->meta_type, $object_id, $meta_key, $single );
+	}
+
+	/**
+	 * Override delete_metadata() to use delete_network_option() if available.
+	 *
+	 * @param int    $object_id  ID of the object metadata is for
+	 * @param string $meta_key   Metadata key
+	 * @param mixed $meta_value  Optional. Metadata value. Must be serializable
+	 *                           if non-scalar. If specified, only delete
+	 *                           metadata entries with this value. Otherwise,
+	 *                           delete all entries with the specified meta_key.
+	 *                           Pass `null, `false`, or an empty string to skip
+	 *                           this check. For backward compatibility, it is
+	 *                           not possible to pass an empty string to delete
+	 *                           those entries with an empty string for a value.
+	 *
+	 * @return bool True on successful delete, false on failure.
+	 */
+	protected function delete_metadata( $object_id, $meta_key, $meta_value = '' ) {
+		if ( function_exists( 'delete_network_option' ) && '' === $meta_value ) {
+			return delete_network_option( $object_id, $meta_key );
+		}
+		return delete_metadata( $this->meta_type, $object_id, $meta_key, $meta_value, false );
+	}
 }