/**
 * HashMap构造函数
 * strMap 使用 toString 生成的参数
 */
function JHashMap(strMap)
{
    this.length = 0;
    this.prefix = "hashmap_prefix_20040716_";
    if(strMap!=null){
    	var entrys = strMap.split("\r\n");
    	for(var i=0;i<entrys.length;i++){
    		if(entrys[i].indexOf(":")>0){
    			var key_value = entrys[i].split(":");
    			this.put(key_value[0],key_value[1]);
    		}
    	}
    }
}
/**
 * 向HashMap中添加键值对
 */
JHashMap.prototype.put = function (key, value)
{
    this[this.prefix + key] = value;
    this.length ++;
}
/**
 * 从HashMap中获取value值
 */
JHashMap.prototype.get = function(key)
{
    return typeof this[this.prefix + key] == "undefined"
            ? null : this[this.prefix + key];
}
/**
 * 从HashMap中获取所有key的集合，以数组形式返回
 */
JHashMap.prototype.keySet = function()
{
    var arrKeySet = new Array();
    var index = 0;
    for(var strKey in this)
    {
        if(strKey.substring(0,this.prefix.length) == this.prefix)
            arrKeySet[index ++] = strKey.substring(this.prefix.length);
    }
    return arrKeySet.length == 0 ? null : arrKeySet;
}
/**
 * 从HashMap中获取value的集合，以数组形式返回
 */
JHashMap.prototype.values = function()
{
    var arrValues = new Array();
    var index = 0;
    for(var strKey in this)
    {
        if(strKey.substring(0,this.prefix.length) == this.prefix)
            arrValues[index ++] = this[strKey];
    }
    return arrValues.length == 0 ? null : arrValues;
}
/**
 * 获取HashMap的value值数量
 */
JHashMap.prototype.size = function()
{
    return this.length;
}
/**
 * 删除指定的值
 */
JHashMap.prototype.remove = function(key)
{
    if(this.containsKey(key)){
	    delete this[this.prefix + key];
	    this.length --;
    }
}
/**
 * 清空HashMap
 */
JHashMap.prototype.clear = function()
{
    for(var strKey in this)
    {
        if(strKey.substring(0,this.prefix.length) == this.prefix)
            delete this[strKey];  
    }
    this.length = 0;
}
/**
 * 判断HashMap是否为空
 */
JHashMap.prototype.isEmpty = function()
{
    return this.length == 0;
}
/**
 * 判断HashMap是否存在某个key
 */
JHashMap.prototype.containsKey = function(key)
{
    for(var strKey in this)
    {
       if(strKey == this.prefix + key)
          return true; 
    }
    return false;
}
/**
 * 判断HashMap是否存在某个value
 */
JHashMap.prototype.containsValue = function(value)
{
    for(var strKey in this)
    {
       if(this[strKey] == value)
          return true; 
    }
    return false;
}
/**
 * 把一个HashMap的值加入到另一个HashMap中，参数必须是HashMap
 */
JHashMap.prototype.putAll = function(map)
{
    if(map == null)
        return;
    if(map.constructor != JHashMap)
        return;
    var arrKey = map.keySet();
    var arrValue = map.values();
    for(var i in arrKey)
       this.put(arrKey[i],arrValue[i]);
}
//toString
JHashMap.prototype.toString = function()
{
    var str = "";
    for(var strKey in this)
    {
        if(strKey.substring(0,this.prefix.length) == this.prefix)
              str += strKey.substring(this.prefix.length)
                  + ":" + this[strKey] + "\r\n";
    }
    return str;
}