1
0
Fork 0
easejs/lib/MethodWrappers.js

86 lines
2.6 KiB
JavaScript

/**
* Default method wrapper functions
*
* Copyright (C) 2010 Mike Gerwitz
*
* This file is part of ease.js.
*
* ease.js is free software: you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License as published by the Free
* Software Foundation, either version 3 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* @author Mike Gerwitz
*/
/**
* Method wrappers for standard (non-fallback)
* @type {Object}
*/
exports.standard = {
wrapOverride: function( method, super_method, cid, getInst )
{
return function()
{
var context = getInst( this, cid ) || this,
retval = undefined
;
// the _super property will contain the parent method (we don't
// store the previous value for performance reasons and because,
// during conventional use, it's completely unnecessary)
context.__super = super_method;
retval = method.apply( context, arguments );
// prevent sneaky bastards from breaking encapsulation by stealing
// method references (we set to undefined rather than deleting it
// because deletion causes performance degradation within V8)
context.__super = undefined;
// if the value returned from the method was the context that we
// passed in, return the actual instance (to ensure we do not break
// encapsulation)
if ( retval === context )
{
return this;
}
return retval;
};
},
wrapNew: function( method, super_method, cid, getInst )
{
return function()
{
var context = getInst( this, cid ) || this,
retval = undefined
;
// invoke the method
retval = method.apply( context, arguments );
// if the value returned from the method was the context that we
// passed in, return the actual instance (to ensure we do not break
// encapsulation)
if ( retval === context )
{
return this;
}
return retval;
};
},
};