// Generated by CoffeeScript 1.7.1
(function() {
  var Optional;

  Optional = (function() {
    function Optional(type, condition) {
      this.type = type;
      this.condition = condition != null ? condition : true;
    }

    Optional.prototype.decode = function(stream, parent) {
      var condition;
      condition = this.condition;
      if (typeof condition === 'function') {
        condition = condition.call(parent, parent);
      }
      if (condition) {
        return this.type.decode(stream, parent);
      }
    };

    Optional.prototype.size = function(val, parent) {
      var condition;
      condition = this.condition;
      if (typeof condition === 'function') {
        condition = condition.call(parent, parent);
      }
      if (condition) {
        return this.type.size(val, parent);
      } else {
        return 0;
      }
    };

    Optional.prototype.encode = function(stream, val, parent) {
      var condition;
      condition = this.condition;
      if (typeof condition === 'function') {
        condition = condition.call(parent, parent);
      }
      if (condition) {
        return this.type.encode(stream, val, parent);
      }
    };

    return Optional;

  })();

  module.exports = Optional;

}).call(this);