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<?php

namespace WPMVC\MVC\Contracts;

/**
 * Interface contract for objects with Meta.
 *
 * @author Alejandro Mostajo <http://about.me/amostajo>
 * @copyright 10Quality <http://www.10quality.com>
 * @license MIT
 * @package WPMVC\MVC
 * @version 1.0.0
 */
interface Metable
{
    /**
     * Loads meta values into objet.
     * @since 1.0.0
     */
    public function load_meta();
    /**
     * Returns flag indicating if object has meta key.
     * @since 1.0.0
     *
     * @param string $key Key.
     *
     * @return bool
     */
    public function has_meta( $key );
    /**
     * Gets value from meta.
     * @since 1.0.0
     *
     * @param string $key Key.
     *
     * @return mixed.
     */
    public function get_meta( $key );
    /**
     * Sets meta value.
     * @since 1.0.0
     *
     * @param string $key   Key.
     * @param mixed  $value Value.
     */
    public function set_meta( $key, $value );
    /**
     * Deletes meta.
     * @since 1.0.0
     *
     * @param string $key Key.
     */
    public function delete_meta( $key );
    /**
     * Either adds or updates a meta.
     * @since 1.0.0
     *
     * @param string $key   Key.
     * @param mixed  $value Value.
     */
    public function save_meta( $key, $value );
    /**
     * Saves all meta values.
     * @since 1.0.0
     */
    public function save_meta_all();
}