# Creating and Updating ABAP Classes (Low-Level)
## Step 1: Get Session
**Tool**: `GetSession`
**Request**:
```json
{"force_new":false}
```
**Response**:
```json
{"success":true,"session_id":"a1b2c3d4e5f6789012345678901234567890abcd","session_state":{"cookies":"SAP_SESSIONID_E19_100=xyz123abc; Path=/; HttpOnly","csrf_token":"AbCdEf123456","cookie_store":{}}}
```
---
## Step 2: Validate Class
**Tool**: `ValidateClassLow`
**Request**:
```json
{"class_name":"ZCL_TEST_001","package_name":"ZOK_LAB","session_id":"a1b2c3d4e5f6789012345678901234567890abcd","session_state":{"cookies":"SAP_SESSIONID_E19_100=xyz123abc; Path=/; HttpOnly","csrf_token":"AbCdEf123456","cookie_store":{}}}
```
**Response**:
```json
{"success":true,"valid":true,"message":"Class name ZCL_TEST_001 is valid and available"}
```
---
## Step 3: Create Class
**Tool**: `CreateClassLow`
**Request**:
```json
{"class_name":"ZCL_TEST_001","description":"Test class","package_name":"ZOK_LAB","transport_request":"E19K905635","session_id":"a1b2c3d4e5f6789012345678901234567890abcd","session_state":{"cookies":"SAP_SESSIONID_E19_100=xyz123abc; Path=/; HttpOnly","csrf_token":"AbCdEf123456","cookie_store":{}}}
```
**Response**:
```json
{"success":true,"class_name":"ZCL_TEST_001","uri":"/sap/bc/adt/oo/classes/zcl_test_001","message":"Class created successfully"}
```
---
## Step 4: Lock Class
**Tool**: `LockClassLow`
**Request**:
```json
{"class_name":"ZCL_TEST_001","session_id":"a1b2c3d4e5f6789012345678901234567890abcd","session_state":{"cookies":"SAP_SESSIONID_E19_100=xyz123abc; Path=/; HttpOnly","csrf_token":"AbCdEf123456","cookie_store":{}}}
```
**Response**:
```json
{"success":true,"class_name":"ZCL_TEST_001","lock_handle":"LOCK_HANDLE_123456789","message":"Class locked successfully"}
```
---
## Step 5: Check Code BEFORE Update (CRITICAL)
**Tool**: `CheckClassLow`
**Request**:
```json
{"class_name":"ZCL_TEST_001","source_code":"CLASS zcl_test_001 DEFINITION\n PUBLIC\n FINAL\n CREATE PUBLIC .\n\n PUBLIC SECTION.\n METHODS: constructor,\n get_data RETURNING VALUE(result) TYPE string.\n PROTECTED SECTION.\n PRIVATE SECTION.\n DATA: mv_data TYPE string.\nENDCLASS.\n\nCLASS zcl_test_001 IMPLEMENTATION.\n METHOD constructor.\n mv_data = 'Initialized'.\n ENDMETHOD.\n\n METHOD get_data.\n result = mv_data.\n ENDMETHOD.\nENDCLASS.","version":"inactive","session_id":"a1b2c3d4e5f6789012345678901234567890abcd","session_state":{"cookies":"SAP_SESSIONID_E19_100=xyz123abc; Path=/; HttpOnly","csrf_token":"AbCdEf123456","cookie_store":{}}}
```
**Response** (Passed):
```json
{"success":true,"checked":true,"messages":[],"errors":[],"warnings":[],"message":"Syntax check passed"}
```
**Response** (Failed):
```json
{"success":true,"checked":false,"messages":[{"type":"error","text":"Method 'GET_DATA' is not defined in class definition","line":15,"column":5}],"errors":[{"type":"error","text":"Method 'GET_DATA' is not defined in class definition","line":15,"column":5}],"warnings":[],"message":"Syntax check failed: 1 error(s)"}
```
---
## Step 6: Update Class (Only if Check Passed)
**Tool**: `UpdateClassLow`
**Request**:
```json
{"class_name":"ZCL_TEST_001","source_code":"CLASS zcl_test_001 DEFINITION\n PUBLIC\n FINAL\n CREATE PUBLIC .\n\n PUBLIC SECTION.\n METHODS: constructor,\n get_data RETURNING VALUE(result) TYPE string.\n PROTECTED SECTION.\n PRIVATE SECTION.\n DATA: mv_data TYPE string.\nENDCLASS.\n\nCLASS zcl_test_001 IMPLEMENTATION.\n METHOD constructor.\n mv_data = 'Initialized'.\n ENDMETHOD.\n\n METHOD get_data.\n result = mv_data.\n ENDMETHOD.\nENDCLASS.","lock_handle":"LOCK_HANDLE_123456789","session_id":"a1b2c3d4e5f6789012345678901234567890abcd","session_state":{"cookies":"SAP_SESSIONID_E19_100=xyz123abc; Path=/; HttpOnly","csrf_token":"AbCdEf123456","cookie_store":{}}}
```
**Response**:
```json
{"success":true,"class_name":"ZCL_TEST_001","message":"Class updated successfully"}
```
---
## Step 7: Unlock Class
**Tool**: `UnlockClassLow`
**Request**:
```json
{"class_name":"ZCL_TEST_001","lock_handle":"LOCK_HANDLE_123456789","session_id":"a1b2c3d4e5f6789012345678901234567890abcd","session_state":{"cookies":"SAP_SESSIONID_E19_100=xyz123abc; Path=/; HttpOnly","csrf_token":"AbCdEf123456","cookie_store":{}}}
```
**Response**:
```json
{"success":true,"class_name":"ZCL_TEST_001","message":"Class unlocked successfully"}
```
---
## Step 8: Check Inactive Version
**Tool**: `CheckClassLow`
**Request**:
```json
{"class_name":"ZCL_TEST_001","version":"inactive","session_id":"a1b2c3d4e5f6789012345678901234567890abcd","session_state":{"cookies":"SAP_SESSIONID_E19_100=xyz123abc; Path=/; HttpOnly","csrf_token":"AbCdEf123456","cookie_store":{}}}
```
**Response**:
```json
{"success":true,"checked":true,"messages":[],"errors":[],"warnings":[],"message":"Syntax check passed"}
```
---
## Step 9: Activate Class
**Option A: Individual**
**Tool**: `ActivateClassLow`
**Request**:
```json
{"class_name":"ZCL_TEST_001","session_id":"a1b2c3d4e5f6789012345678901234567890abcd","session_state":{"cookies":"SAP_SESSIONID_E19_100=xyz123abc; Path=/; HttpOnly","csrf_token":"AbCdEf123456","cookie_store":{}}}
```
**Response**:
```json
{"success":true,"class_name":"ZCL_TEST_001","activation":{"activated":true,"checked":true,"generated":false},"messages":[],"warnings":[],"errors":[],"message":"Class activated successfully"}
```
**Option B: Group Activation**
**Tool**: `ActivateObjectLow`
**Request**:
```json
{"objects":[{"name":"ZCL_TEST_001","type":"CLAS/OC"},{"name":"ZCL_TEST_002","type":"CLAS/OC"}],"preaudit":true}
```
**Response**:
```json
{"success":true,"objects_count":2,"objects":[{"name":"ZCL_TEST_001","type":"CLAS/OC","uri":"/sap/bc/adt/oo/classes/zcl_test_001"},{"name":"ZCL_TEST_002","type":"CLAS/OC","uri":"/sap/bc/adt/oo/classes/zcl_test_002"}],"activation":{"activated":true,"checked":true,"generated":false},"messages":[],"warnings":[],"errors":[],"message":"Successfully activated 2 object(s)"}
```
