cache = isNode ? jQuery.cache : elem,

// Only defining an ID for JS objects if its cache already exists allows
// the code to shortcut on the same path as a DOM node with no cache
id = isNode ? elem[ internalKey ] : elem[ internalKey ] && internalKey;

// Avoid doing any more work than we need to when trying to get data on an
// object that has no data at all
if ( (!id || !cache[id] || (!pvt && !cache[id].data)) && getByName && data === undefined ) {
return;
}

if ( !id ) {
// Only DOM nodes need a new unique ID for each element since their data
// ends up in the global cache
if ( isNode ) {
elem[ internalKey ] = id = core_deletedIds.pop() || jQuery.guid++;
} else {
id = internalKey;
}
}

if ( !cache[ id ] ) {
cache[ id ] = {};

// Avoids exposing jQuery metadata on plain JS objects when the object
// is serialized using JSON.stringify
if ( !isNode ) {
cache[ id ].toJSON = jQuery.noop;
}
}

// An object can be passed to jQuery.data instead of a key/value pair; this gets
// shallow copied over onto the existing cache
if ( typeof name === "object" || typeof name === "function" ) {
if ( pvt ) {
cache[ id ] = jQuery.extend( cache[ id ], name );
} else {
cache[ id ].data = jQuery.extend( cache[ id ].data, name );
}
}

thisCache = cache[ id ];

// jQuery data() is stored in a separate object inside the object's internal data
// cache in order to avoid key collisions between internal data and user-defined
// data.
if ( !pvt ) {
if ( !thisCache.data ) {
thisCache.data = {};
}

thisCache = thisCache.data;
}

if ( data !== undefined ) {
thisCache[ jQuery.camelCase( name ) ] = data;
}

// Check for both converted-to-camel and non-converted data property names
// If a data property was specified
if ( getByName ) {

// First Try to find as-is property data
ret = thisCache[ name ];

// Test for null|undefined property data
if ( ret == null ) {

// Try to find the camelCased property
ret = thisCache[ jQuery.camelCase( name ) ];
}
} else {
ret = thisCache;
}

return ret;
}

function internalRemoveData( elem, name, pvt ) {
if ( !jQuery.acceptData( elem ) ) {
return;
}

var i, l, thisCache,
isNode = elem.nodeType,

// See jQuery.data for more information
cache = isNode ? jQuery.cache : elem,
id = isNode ? elem[ jQuery.expando ] : jQuery.expando;

// If there is already no cache entry for this object, there is no
// purpose in continuing
if ( !cache[ id ] ) {
return;
}

if ( name ) {

thisCache = pvt ? cache[ id ] : cache[ id ].data;

if ( thisCache ) {

// Support array or space separated string names for data keys
if ( !jQuery.isArray( name ) ) {

// try the string as a key before any manipulation
if ( name in thisCache ) {
name = [ name ];
} else {

// split the camel cased version by spaces unless a key with the spaces exists
name = jQuery.camelCase( name );
if ( name in thisCache ) {
name = [ name ];
} else {
name = name.split(" ");
}
}
} else {
// If "name" is an array of keys...
// When data is initially created, via ("key", "val") signature,
// keys will be converted to camelCase.
// Since there is no way to tell _how_ a key was added, remove
// both plain key and camelCase key. #12786
// This will only penalize the array argument path.
name = name.concat( jQuery.map( name, jQuery.camelCase ) );
}

for ( i = 0, l = name.length; i < l; i++ ) {
delete thisCache[ name[i] ];
}

// If there is no data left in the cache, we want to continue
// and let the cache object itself get destroyed
if ( !( pvt ? isEmptyDataObject : jQuery.isEmptyObject )( thisCache ) ) {
return;
}
}
}

// See jQuery.data for more information
if ( !pvt ) {
delete cache[ id ].data;

// Don't destroy the parent cache unless the internal data object
// had been the only thing left in it
if ( !isEmptyDataObject( cache[ id ] ) ) {
return;
}
}

// Destroy the cache
if ( isNode ) {
jQuery.cleanData( [ elem ], true );

// Use delete when supported for expandos or `cache` is not a window per isWindow (#10080)
} else if ( jQuery.support.deleteExpando || cache != cache.window ) {
delete cache[ id ];

// When all else fails, null
} else {
cache[ id ] = null;
}
}

jQuery.extend({
cache: {},

// Unique for each copy of jQuery on the page
// Non-digits removed to match rinlinejQuery
expando: "jQuery" + ( core_version + Math.random() ).replace( /\D/g, "" ),

// The following elements throw uncatchable exceptions if you
// attempt to add expando properties to them.
noData: {
"embed": true,
// Ban all objects except for Flash (which handle expandos)
"object": "clsid:D27CDB6E-AE6D-11cf-96B8-444553540000",
"applet": true
},

hasData: function( elem ) {
elem = elem.nodeType ? jQuery.cache[ elem[jQuery.expando] ] : elem[ jQuery.expando ];
return !!elem && !isEmptyDataObject( elem );
},

data: function( elem, name, data ) {
return internalData( elem, name, data );
},

removeData: function( elem, name ) {
return internalRemoveData( elem, name );
},

// For internal use only.
_data: function( elem, name, data ) {
return internalData( elem, name, data, true );
},

_removeData: function( elem, name ) {
return internalRemoveData( elem, name, true );
},

// A method for determining if a DOM node can handle the data expando
acceptData: function( elem ) {
// Do not set data on non-element because it will not be cleared (#8335).
if ( elem.nodeType && elem.nodeType !== 1 && elem.nodeType !== 9 ) {
return false;
}

var noData = elem.nodeName && jQuery.noData[ elem.nodeName.toLowerCase() ];

// nodes accept data unless otherwise specified; rejection can be conditional
return !noData || noData !== true && elem.getAttribute("classid") === noData;
}
});

jQuery.fn.extend({
data: function( key, value ) {
var attrs, name,
elem = this[0],
i = 0,
data = null;

// Gets all values
if ( key === undefined ) {
if ( this.length ) {
data = jQuery.data( elem );