graphviz/lib/deps/core_ext/hash.js

Node.js interface to the GraphViz graphing tool

var Hash = exports.Hash = function() {
  this.length = 0;
  this.items = new Array();
  for (var i = 0; i < arguments.length; i += 2) {
    if (typeof(arguments[i + 1]) != 'undefined') {
      this.items[arguments[i]] = arguments[i + 1];
      this.length++;
    }
  }
}

Hash.prototype.removeItem = function(in_key) {
  var tmp_previous;
  if (typeof(this.items[in_key]) != 'undefined') {
    this.length--;
    var tmp_previous = this.items[in_key];
    delete this.items[in_key];
  }
   
  return tmp_previous;
}

Hash.prototype.getItem = function(in_key) {
  return this.items[in_key];
}

Hash.prototype.setItem = function(in_key, in_value) {
  var tmp_previous;
  if (typeof(in_value) != 'undefined') {
    if (typeof(this.items[in_key]) == 'undefined') {
      this.length++;
    }
    else {
      tmp_previous = this.items[in_key];
    }

    this.items[in_key] = in_value;
  }
   
  return tmp_previous;
}

Hash.prototype.hasItem = function(in_key) {
  return typeof(this.items[in_key]) != 'undefined';
}

Hash.prototype.clear = function() {
  for (var i in this.items) {
    delete this.items[i];
  }

  this.length = 0;
}