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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 + Math.random();
}
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;
});
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