clauses = array(); $this->operator = $operator; if ($this->operator) { $this->operator = strtolower($this->operator); if ($this->operator !== 'or' && $this->operator !== 'and') { throw new \ATWS\ATWSException("Unrecognized operator: \'{$operator}\'"); } } } public function addField(QueryField $field) { $this->clauses[] = $field; } public function addCondition(QueryCondition $condition) { $this->clauses[] = $condition; } public function asXml() { $str = ""; $startTag = "operator) { $startTag .= " operator=\"{$this->operator}\""; } $startTag .= ">"; foreach ($this->clauses as $c) { $str .= $c->asXml(); } return "{$startTag}{$str}"; } }