public function process()
 {
     $this->params['output'] = 'json';
     $context = \CADB\Model\Context::instance();
     $fields = \CADB\Agreement::getFieldInfo(1);
     $this->fields = array();
     foreach ($fields['field'] as $f => $v) {
         if ($v['table'] == 'agreement') {
             $this->fields[$f] = $v;
         }
     }
     /* check field type */
     if ($this->params['mode'] == 'delete' || $this->params['mode'] == 'fork') {
         if (!$this->params['nid']) {
             \CADB\RespondJson::ResultPage(array(-1, '단체협약 번호를 입력하세요'));
         }
         if ($this->params['mode'] == 'fork') {
             if (!$this->params['did']) {
                 \CADB\RespondJson::ResultPage(array(-1, '단체협약 버젼번호를 입력하세요'));
             }
         }
     } else {
         if (!$this->params['subject']) {
             \CADB\RespondJson::ResultPage(array(-1, '단협 제목을 입력하세요'));
         }
         if (!$this->params['content']) {
             \CADB\RespondJson::ResultPage(array(-2, '단협 내용을 입력하세요'));
         }
         foreach ($this->fields as $fid => $v) {
             if ($v['required']) {
                 if (!$this->params['f' . $fid]) {
                     \CADB\RespondJson::ResultPage(array($fid, $v['subject'] . '을 입력하세요'));
                 }
             }
         }
     }
     if ($this->params['nid']) {
         $this->articles = \CADB\Agreement::getAgreement($this->params['nid'], $this->params['did']);
         if (!$this->articles) {
             \CADB\RespondJson::ResultPage(array(-3, '존재하지 않는 단협입니다.'));
         }
         if ($this->params['mode'] == 'delete') {
             $ret = \CADB\Agreement\DBM::delete($this->fields, $this->params['nid']);
         } else {
             if ($this->params['mode'] == 'fork') {
                 $ret = \CADB\Agreement\DBM::fork($this->fields, $this->params['nid'], $this->params['did']);
             } else {
                 $ret = \CADB\Agreement\DBM::modify($this->fields, $this->articles, $this->params);
             }
         }
         if ($ret < 0) {
             \CADB\RespondJson::ResultPage(array(-4, '데이터베이스를 수정하는 도중 장애가 발생했습니다.'));
         }
     } else {
         $ret = \CADB\Agreement\DBM::insert($this->fields, $this->params);
         if ($ret < 0) {
             \CADB\RespondJson::ResultPage(array(-4, \CADB\Agreement\DBM::errorMsg() ? \CADB\Agreement\DBM::errorMsg() : '데이터베이스에 입력하는 도중 장애가 발생했습니다.'));
         }
     }
     $this->nid = $ret;
 }