public ASTNode preAnalyze()

in hcatalog/core/src/main/java/org/apache/hive/hcatalog/cli/SemanticAnalysis/HCatSemanticAnalyzer.java [61:152]
67 lines of code
50 McCabe index (conditional complexity)

  public ASTNode preAnalyze(HiveSemanticAnalyzerHookContext context, ASTNode ast)
    throws SemanticException {

    this.ast = ast;
    switch (ast.getToken().getType()) {

    // HCat wants to intercept following tokens and special-handle them.
    case HiveParser.TOK_CREATETABLE:
      hook = new CreateTableHook();
      return hook.preAnalyze(context, ast);

    case HiveParser.TOK_CREATEDATABASE:
      hook = new CreateDatabaseHook();
      return hook.preAnalyze(context, ast);

    case HiveParser.TOK_ALTERTABLE:
      if (((ASTNode) ast.getChild(1)).getToken().getType() == HiveParser.TOK_ALTERTABLE_FILEFORMAT) {
        return ast;
      } else if (((ASTNode) ast.getChild(1)).getToken().getType() == HiveParser.TOK_ALTERTABLE_MERGEFILES) {
        // unsupported
        throw new SemanticException("Operation not supported.");
      } else {
        return ast;
      }

      // HCat will allow these operations to be performed.
      // Database DDL
    case HiveParser.TOK_SHOWDATABASES:
    case HiveParser.TOK_DROPDATABASE:
    case HiveParser.TOK_SWITCHDATABASE:
    case HiveParser.TOK_DESCDATABASE:
    case HiveParser.TOK_ALTERDATABASE_PROPERTIES:

      // View DDL
      // "alter view add partition" does not work because of the nature of implementation
      // of the DDL in hive. Hive will internally invoke another Driver on the select statement,
      // and HCat does not let "select" statement through. I cannot find a way to get around it
      // without modifying hive code. So just leave it unsupported.
      //case HiveParser.TOK_ALTERVIEW_ADDPARTS:
    case HiveParser.TOK_ALTERVIEW_DROPPARTS:
    case HiveParser.TOK_ALTERVIEW_PROPERTIES:
    case HiveParser.TOK_ALTERVIEW_RENAME:
    case HiveParser.TOK_ALTERVIEW:
    case HiveParser.TOK_CREATEVIEW:
    case HiveParser.TOK_DROPVIEW:

      // Authorization DDL
    case HiveParser.TOK_CREATEROLE:
    case HiveParser.TOK_DROPROLE:
    case HiveParser.TOK_GRANT_ROLE:
    case HiveParser.TOK_GRANT_WITH_OPTION:
    case HiveParser.TOK_GRANT:
    case HiveParser.TOK_REVOKE_ROLE:
    case HiveParser.TOK_REVOKE:
    case HiveParser.TOK_SHOW_GRANT:
    case HiveParser.TOK_SHOW_ROLE_GRANT:

      // Misc DDL
    case HiveParser.TOK_LOCKTABLE:
    case HiveParser.TOK_UNLOCKTABLE:
    case HiveParser.TOK_SHOWLOCKS:
    case HiveParser.TOK_DESCFUNCTION:
    case HiveParser.TOK_SHOWFUNCTIONS:
    case HiveParser.TOK_EXPLAIN:

      // Table DDL
    case HiveParser.TOK_ALTERTABLE_ADDPARTS:
    case HiveParser.TOK_ALTERTABLE_ADDCOLS:
    case HiveParser.TOK_ALTERTABLE_CHANGECOL_AFTER_POSITION:
    case HiveParser.TOK_ALTERTABLE_SETSERDEPROPERTIES:
    case HiveParser.TOK_ALTERTABLE_UNSETSERDEPROPERTIES:
    case HiveParser.TOK_ALTERTABLE_CLUSTER_SORT:
    case HiveParser.TOK_ALTERTABLE_DROPPARTS:
    case HiveParser.TOK_ALTERTABLE_PROPERTIES:
    case HiveParser.TOK_ALTERTABLE_RENAME:
    case HiveParser.TOK_ALTERTABLE_RENAMECOL:
    case HiveParser.TOK_ALTERTABLE_REPLACECOLS:
    case HiveParser.TOK_ALTERTABLE_SERIALIZER:
    case HiveParser.TOK_ALTERTABLE_TOUCH:
    case HiveParser.TOK_DESCTABLE:
    case HiveParser.TOK_DROPTABLE:
    case HiveParser.TOK_SHOW_TABLESTATUS:
    case HiveParser.TOK_SHOWPARTITIONS:
    case HiveParser.TOK_SHOWTABLES:
      return ast;

    // In all other cases, throw an exception. Its a white-list of allowed operations.
    default:
      throw new SemanticException("Operation not supported.");

    }
  }