/*
---
name: XtLightbox.Adaptor

description: extendable lightbox Adaptor base

license: MIT-style

authors:
- Anton Suprun <kpobococ@gmail.com>

requires:
- XtLightbox

provides: XtLightbox.Adaptor

...
*/
(function()
{
    var Adaptor = this.XtLightbox.Adaptor = new Class(
    {
        Implements: Options,

        $name: '',

        options: {},

        initialize: function(options)
        {
            this.setOptions(options);
        },

        check: function(element)
        {
            return element.rel.test(/^lightbox/);
        },

        getContent: function(element)
        {
            return '';
        },

        getTitle: function(element)
        {
            return element.title;
        },

        getSize: function(element)
        {
            return {x:0,y:0};
        },

        load: function(element, callback)
        {
            callback(element);
            return this;
        },

        destroy: function()
        {
            return null;
        }
    });

    var count = 0;
    var cache = {};

    Adaptor.cache = function(element, content)
    {
        if (!element.$xtlightbox) throw new Error('Element must be attached to a lightbox');
        var a = element.$xtlightbox.adaptor, i = element.$xtlightbox.id;
        if (!i) i = element.$xtlightbox.id = ++count;
        cache[a + '-' + i] = content;
        return element;
    }

    Adaptor.load = function(element)
    {
        if (!element.$xtlightbox) throw new Error('Element must be attached to a lightbox');
        if (!Adaptor.cached(element)) return null;
        var a = element.$xtlightbox.adaptor, i = element.$xtlightbox.id;
        return cache[a + '-' + i];
    }

    Adaptor.clear = function(element)
    {
        if (!Adaptor.cached(element)) return element;
        var a = element.$xtlightbox.adaptor, i = element.$xtlightbox.id;
        cache[a + '-' + i] = null;
        return element;
    }

    Adaptor.cached = function(element)
    {
        if (!element.$xtlightbox) return false;
        var i = element.$xtlightbox.id, a = element.$xtlightbox.adaptor;
        return i && a && cache[a + '-' + i];
    }
})();