mass Framework data模块
mass Framework的内存对象缓存系统,它会在目标对象或目标对象对应的代理对象添加一个uniqueID ,用于关链相应的缓存体。通过dom.data把数据储存到相应的缓存体中去。
//==================================================
// 数据缓存模块
//==================================================
(function(global,DOC){
var dom = global[DOC.URL.replace(/(#.+|\W)/g,'')];
dom.define("data", "lang", function(){
dom.log("已加载data模块");
var remitter = /object|function/
dom.mix(dom,{
memcache:{},
/*
* @param {Any} target
* @param {String|Object} name
* @param {Any} data
**/
data : function( target, name, data, pvt ) {
if(target && remitter.test(typeof target)){
var id = target.uniqueNumber || (target.uniqueNumber=++dom["@uuid"]);
if(name === "@uuid"){
return id;
}
var memcache = target.nodeType === 1 ? dom.memcache: target;
var table = memcache[ "@data_"+id ] || (memcache[ "@data_"+id ] = {});
if ( !pvt ) {
table = table.data || (table.data = {});
}
var getByName = typeof name === "string";
if ( name && typeof name == "object" ) {
dom.mix(table, name);
}else if(getByName && data !== void 0){
table[ name ] = data;
}
return getByName ? table[ name ] : table;
}
},
_data:function(target,name,data){
return dom.data(target, name, data, true)
},
/*
* @param {Any} target
* @param {String|Opt} name
**/
removeData : function(target, name, pvt){
if(target && remitter.test(typeof target)){
var id = target.uniqueNumber;
if ( !id ) {
return;
}
var memcache = target.nodeType === 1 ? dom.memcache : target;
var table = memcache["@data_"+id], clear = 1, ret = typeof name == "string" ;
if ( table && ret ) {
if(!pvt){
table = table.data
}
if(table){
ret = table[ name ];
delete table[ name ];
}
var cache = memcache["@data_"+id];
loop:
for(var key in cache){
if(key == "data"){
for(var i in cache.data){
clear = 0;
break loop;
}
}else{
clear = 0;
break loop;
}
}
}
if(clear){
delete memcache["@data_"+id];
}
return ret;
}
},
/*
*把对象dest的数据缓存体合并到src的数据缓存体上
* @param {Any} target
* @param {String|Opt} name
**/
mergeData:function(clone, src){
var srcData = dom._data(src), cloneData = dom._data(clone);
if(srcData && cloneData){
dom.Object.merge.call(cloneData, srcData);
}
}
});
});
})(this,this.document);
//2011.9.27 uniqueID改为uniqueNumber 简化data与removeData
//2011.9.28 添加dom._data处理内部数据
示例
dom.require("data",function(){
var a = {};
//写入数揣
dom.data(a,"name","司徒正美");
//读取数据
dom.log(a);//{ uniqueNumber:2, "@data_2":{data:{name:"司徒正美"}} }
var b = {};
dom.data(b,"sex","man");
//合并数据
dom.mergeData(b,a);
dom.log(b);//{ uniqueNumber:3, "@data_3":{data:{name:"司徒正美",sex:"man"}} }
//删除数据
dom.removeData(b,"name");
dom.log(b);//{ uniqueNumber:3, "@data_3":{data:{sex:"man"}} }
dom.data(b,"inner","innerHTML",true);
dom.log(b);//{ uniqueNumber:3, "@data_3":{inner:"innerHTML",data:{sex:"man"}} }
});