Javascript Hashtable

///// Hashtable in JavaScript /////
function Hashtable() {
this.clear = hashtable_clear;
this.containsKey = hashtable_containsKey;
this.containsValue = hashtable_containsValue;
this.get = hashtable_get;
this.isEmpty = hashtable_isEmpty;
this.keys = hashtable_keys;
this.put = hashtable_put;
this.remove = hashtable_remove;
this.size = hashtable_size;
this.toString = hashtable_toString;
this.values = hashtable_values;
this.hashtable = new Array();
}

/*=======Private methods for internal use only========*/
function hashtable_clear(){
this.hashtable = new Array();
}

function hashtable_containsKey(key){
var exists = false;
for (var i in this.hashtable) {
if (i == key && this.hashtable[i] != null) {
exists = true;
break;
}
}
return exists;
}

function hashtable_containsValue(value){
var contains = false;
if (value != null) {
for (var i in this.hashtable) {
if (this.hashtable[i] == value) {
contains = true;
break;
}
}
}
return contains;
}

function hashtable_get(key){
return this.hashtable[key];
}

function hashtable_isEmpty(){
return (parseInt(this.size()) == 0) ? true : false;
}

function hashtable_keys(){
var keys = new Array();
for (var i in this.hashtable) {
if (this.hashtable[i] != null) keys.push(i);
}
return keys;
}

function hashtable_put(key, value){
if (key == null || value == null) {
throw "NullPointerException {"
+ key + "},{" + value + "}";
}
else{
this.hashtable[key] = value;
}
}

function hashtable_remove(key){
var rtn = this.hashtable[key];
this.hashtable[key] = null;
return rtn;
}

function hashtable_size(){
var size = 0;
for (var i in this.hashtable) {
if (this.hashtable[i] != null) size ++;
}
return size;
}

function hashtable_toString(){
var result = "";
for (var i in this.hashtable) {
if (this.hashtable[i] != null)
result += "{" + i + "},{"
+ this.hashtable[i] + "}\n";
}
return result;
}

function hashtable_values(){
var values = new Array();
for (var i in this.hashtable) {
if (this.hashtable[i] != null) values.push(this.hashtable[i]);
}
return values;
}
- posted by JaneAthos @ 2/07/2005 06:23:00 PM