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define([

	"../core",

	"../var/rnotwhite",

	"./accepts"

], function( jQuery, rnotwhite ) {

function Data() {

	// Support: Android<4,

	// Old WebKit does not have Object.preventExtensions/freeze method,

	// return new empty object instead with no [[set]] accessor

	Object.defineProperty( this.cache = {}, 0, {

		get: function() {

			return {};

		}

	});

	this.expando = jQuery.expando + Data.uid++;

}

Data.uid = 1;

Data.accepts = jQuery.acceptData;

Data.prototype = {

	key: function( owner ) {

		// We can accept data for non-element nodes in modern browsers,

		// but we should not, see #8335.

		// Always return the key for a frozen object.

		if ( !Data.accepts( owner ) ) {

			return 0;

		}

		var descriptor = {},

			// Check if the owner object already has a cache key

			unlock = owner[ this.expando ];

		// If not, create one

		if ( !unlock ) {

			unlock = Data.uid++;

			// Secure it in a non-enumerable, non-writable property

			try {

				descriptor[ this.expando ] = { value: unlock };

				Object.defineProperties( owner, descriptor );

			// Support: Android<4

			// Fallback to a less secure definition

			} catch ( e ) {

				descriptor[ this.expando ] = unlock;

				jQuery.extend( owner, descriptor );

			}

		}

		// Ensure the cache object

		if ( !this.cache[ unlock ] ) {

			this.cache[ unlock ] = {};

		}

		return unlock;

	},

	set: function( owner, data, value ) {

		var prop,

			// There may be an unlock assigned to this node,

			// if there is no entry for this "owner", create one inline

			// and set the unlock as though an owner entry had always existed

			unlock = this.key( owner ),

			cache = this.cache[ unlock ];

		// Handle: [ owner, key, value ] args

		if ( typeof data === "string" ) {

			cache[ data ] = value;

		// Handle: [ owner, { properties } ] args

		} else {

			// Fresh assignments by object are shallow copied

			if ( jQuery.isEmptyObject( cache ) ) {

				jQuery.extend( this.cache[ unlock ], data );

			// Otherwise, copy the properties one-by-one to the cache object

			} else {

				for ( prop in data ) {

					cache[ prop ] = data[ prop ];

				}

			}

		}

		return cache;

	},

	get: function( owner, key ) {

		// Either a valid cache is found, or will be created.

		// New caches will be created and the unlock returned,

		// allowing direct access to the newly created

		// empty data object. A valid owner object must be provided.

		var cache = this.cache[ this.key( owner ) ];

		return key === undefined ?

			cache : cache[ key ];

	},

	access: function( owner, key, value ) {

		var stored;

		// In cases where either:

		//

		//   1. No key was specified

		//   2. A string key was specified, but no value provided

		//

		// Take the "read" path and allow the get method to determine

		// which value to return, respectively either:

		//

		//   1. The entire cache object

		//   2. The data stored at the key

		//

		if ( key === undefined ||

				((key && typeof key === "string") && value === undefined) ) {

			stored = this.get( owner, key );

			return stored !== undefined ?

				stored : this.get( owner, jQuery.camelCase(key) );

		}

		// [*]When the key is not a string, or both a key and value

		// are specified, set or extend (existing objects) with either:

		//

		//   1. An object of properties

		//   2. A key and value

		//

		this.set( owner, key, value );

		// Since the "set" path can have two possible entry points

		// return the expected data based on which path was taken[*]

		return value !== undefined ? value : key;

	},

	remove: function( owner, key ) {

		var i, name, camel,

			unlock = this.key( owner ),

			cache = this.cache[ unlock ];

		if ( key === undefined ) {

			this.cache[ unlock ] = {};

		} else {

			// Support array or space separated string of keys

			if ( jQuery.isArray( key ) ) {

				// 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 = key.concat( key.map( jQuery.camelCase ) );

			} else {

				camel = jQuery.camelCase( key );

				// Try the string as a key before any manipulation

				if ( key in cache ) {

					name = [ key, camel ];

				} else {

					// If a key with the spaces exists, use it.

					// Otherwise, create an array by matching non-whitespace

					name = camel;

					name = name in cache ?

						[ name ] : ( name.match( rnotwhite ) || [] );

				}

			}

			i = name.length;

			while ( i-- ) {

				delete cache[ name[ i ] ];

			}

		}

	},

	hasData: function( owner ) {

		return !jQuery.isEmptyObject(

			this.cache[ owner[ this.expando ] ] || {}

		);

	},

	discard: function( owner ) {

		if ( owner[ this.expando ] ) {

			delete this.cache[ owner[ this.expando ] ];

		}

	}

};

return Data;

});