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define([

	"./core",

	"./var/rnotwhite",

	"./core/access",

	"./data/var/data_priv",

	"./data/var/data_user"

], function( jQuery, rnotwhite, access, data_priv, data_user ) {

//	Implementation Summary

//

//	1. Enforce API surface and semantic compatibility with 1.9.x branch

//	2. Improve the module's maintainability by reducing the storage

//		paths to a single mechanism.

//	3. Use the same single mechanism to support "private" and "user" data.

//	4. _Never_ expose "private" data to user code (TODO: Drop _data, _removeData)

//	5. Avoid exposing implementation details on user objects (eg. expando properties)

//	6. Provide a clear path for implementation upgrade to WeakMap in 2014

var rbrace = /^(?:\{[\w\W]*\}|\[[\w\W]*\])$/,

	rmultiDash = /([A-Z])/g;

function dataAttr( elem, key, data ) {

	var name;

	// If nothing was found internally, try to fetch any

	// data from the HTML5 data-* attribute

	if ( data === undefined && elem.nodeType === 1 ) {

		name = "data-" + key.replace( rmultiDash, "-$1" ).toLowerCase();

		data = elem.getAttribute( name );

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

			try {

				data = data === "true" ? true :

					data === "false" ? false :

					data === "null" ? null :

					// Only convert to a number if it doesn't change the string

					+data + "" === data ? +data :

					rbrace.test( data ) ? jQuery.parseJSON( data ) :

					data;

			} catch( e ) {}

			// Make sure we set the data so it isn't changed later

			data_user.set( elem, key, data );

		} else {

			data = undefined;

		}

	}

	return data;

}

jQuery.extend({

	hasData: function( elem ) {

		return data_user.hasData( elem ) || data_priv.hasData( elem );

	},

	data: function( elem, name, data ) {

		return data_user.access( elem, name, data );

	},

	removeData: function( elem, name ) {

		data_user.remove( elem, name );

	},

	// TODO: Now that all calls to _data and _removeData have been replaced

	// with direct calls to data_priv methods, these can be deprecated.

	_data: function( elem, name, data ) {

		return data_priv.access( elem, name, data );

	},

	_removeData: function( elem, name ) {

		data_priv.remove( elem, name );

	}

});

jQuery.fn.extend({

	data: function( key, value ) {

		var i, name, data,

			elem = this[ 0 ],

			attrs = elem && elem.attributes;

		// Gets all values

		if ( key === undefined ) {

			if ( this.length ) {

				data = data_user.get( elem );

				if ( elem.nodeType === 1 && !data_priv.get( elem, "hasDataAttrs" ) ) {

					i = attrs.length;

					while ( i-- ) {

						// Support: IE11+

						// The attrs elements can be null (#14894)

						if ( attrs[ i ] ) {

							name = attrs[ i ].name;

							if ( name.indexOf( "data-" ) === 0 ) {

								name = jQuery.camelCase( name.slice(5) );

								dataAttr( elem, name, data[ name ] );

							}

						}

					}

					data_priv.set( elem, "hasDataAttrs", true );

				}

			}

			return data;

		}

		// Sets multiple values

		if ( typeof key === "object" ) {

			return this.each(function() {

				data_user.set( this, key );

			});

		}

		return access( this, function( value ) {

			var data,

				camelKey = jQuery.camelCase( key );

			// The calling jQuery object (element matches) is not empty

			// (and therefore has an element appears at this[ 0 ]) and the

			// `value` parameter was not undefined. An empty jQuery object

			// will result in `undefined` for elem = this[ 0 ] which will

			// throw an exception if an attempt to read a data cache is made.

			if ( elem && value === undefined ) {

				// Attempt to get data from the cache

				// with the key as-is

				data = data_user.get( elem, key );

				if ( data !== undefined ) {

					return data;

				}

				// Attempt to get data from the cache

				// with the key camelized

				data = data_user.get( elem, camelKey );

				if ( data !== undefined ) {

					return data;

				}

				// Attempt to "discover" the data in

				// HTML5 custom data-* attrs

				data = dataAttr( elem, camelKey, undefined );

				if ( data !== undefined ) {

					return data;

				}

				// We tried really hard, but the data doesn't exist.

				return;

			}

			// Set the data...

			this.each(function() {

				// First, attempt to store a copy or reference of any

				// data that might've been store with a camelCased key.

				var data = data_user.get( this, camelKey );

				// For HTML5 data-* attribute interop, we have to

				// store property names with dashes in a camelCase form.

				// This might not apply to all properties...*

				data_user.set( this, camelKey, value );

				// *... In the case of properties that might _actually_

				// have dashes, we need to also store a copy of that

				// unchanged property.

				if ( key.indexOf("-") !== -1 && data !== undefined ) {

					data_user.set( this, key, value );

				}

			});

		}, null, value, arguments.length > 1, null, true );

	},

	removeData: function( key ) {

		return this.each(function() {

			data_user.remove( this, key );

		});

	}

});

return jQuery;

});