Move common custom post functions into abstract

includes/abstracts/abstract-sp-custom-post.php

@@ -0,0 +1,66 @@
+<?php
+/**
+ * Abstract Custom Post Class
+ *
+ * The SportsPress custom post class handles individual post data.
+ *
+ * @class 		SP_Custom_Post
+ * @version		0.8
+ * @package		SportsPress/Abstracts
+ * @category	Abstract Class
+ * @author 		ThemeBoy
+ */
+abstract class SP_Custom_Post {
+
+	/** @var int The post ID. */
+	public $ID;
+
+	/** @var object The actual post object. */
+	public $post;
+
+	/**
+	 * __construct function.
+	 *
+	 * @access public
+	 * @param mixed $post
+	 */
+	public function __construct( $post ) {
+		if ( $post instanceof WP_Post || $post instanceof SP_Custom_Post ):
+			$this->ID   = absint( $post->ID );
+			$this->post = $post;
+		else:
+			$this->ID  = absint( $post );
+			$this->post = get_post( $this->ID );
+		endif;
+	}
+
+	/**
+	 * __isset function.
+	 *
+	 * @access public
+	 * @param mixed $key
+	 * @return bool
+	 */
+	public function __isset( $key ) {
+		return metadata_exists( 'post', $this->ID, 'sp_' . $key );
+	}
+
+	/**
+	 * __get function.
+	 *
+	 * @access public
+	 * @param mixed $key
+	 * @return bool
+	 */
+	public function __get( $key ) {
+		if ( ! isset( $key ) ):
+			return $this->post;
+		else:
+			$value = get_post_meta( $this->ID, 'sp_' . $key, true );
+		endif;
+
+		return $value;
+	}
+
+
+}