Class representing the API constraints on mail clasess.

This is a weird bit of data-in-code, but since we're open sourcing this lib, I think it is the right way to go.

Also: Git gui doesn't know about untracked files. So that is why this is in its own commit.

Shipping/Endicia/MailClass.php

@@ -0,0 +1,43 @@
+<?php
+namespace SparkLib\Shipping\Endicia;
+
+class MailClass {
+  public $name;
+  public $international;
+  public $integrated_form;
+  public $max_items;
+
+  public function __construct($name, $international = false, $integrated_form = null, $max_items = null){
+    $this->name            = $name;
+    $this->international   = $international;
+    $this->integrated_form = $integrated_form;
+    $this->max_items       = $max_items;
+  }
+
+  public static function Express()      { return new static('Express');      }
+  public static function First()        { return new static('First');        }
+  public static function LibraryMail()  { return new static('LibraryMail');  }
+  public static function MediaMail()    { return new static('MediaMail');    }
+  public static function StandardPost() { return new static('StandardPost'); }
+  public static function ParcelSelect() { return new static('ParcelSelect'); }
+  public static function Priority()     { return new static('Priority');     }
+  public static function CriticalMail() { return new static('CriticalMail'); }
+
+  public static function FirstClassMailInternational()           { return new static('FirstClassMailInternational', true, 'Form2976', 5); }
+  public static function FirstClassPackageInternationalService() { return new static('FirstClassPackageInternationalService', true, 'Form2976', 5); }
+  public static function PriorityMailInternational()             { return new static('PriorityMailInternational', true, 'Form2976A'); }
+  public static function ExpressMailInternational()              { return new static('ExpressMailInternational', true, 'Form2976A'); }
+
+  public static function fromString($str) {
+    if ( method_exists(get_class(), $str) ){
+      return static::$str();
+    } else {
+      return null;
+    }
+  }
+
+  public function isInternational(){
+    return isset($this->international) && $this->international;
+  }
+}
+