Package gudusoft.gsqlparser

Interface ITokenHandle

public interface ITokenHandle
use this interface if you like to change token properties generated by lexer before send to parser.
if you change a source token's TSourceToken#tokencode to TBaseType#cmtslashstar TBaseType#cmtdoublehyphen then, this token will be treated as comment
you may also like to change tokencode of a keyword to TBaseType#ident, this will let parser treat this keyword as an identifier.
Here is a demo illustrates how to use this interface to ignore token you don't need. 
 package test.interfaceDemo;

 import gudusoft.gsqlparser.*;
 import junit.framework.TestCase;

 class myTokenHandle implements ITokenHandle{
     public boolean processToken(TSourceToken st){

         if (st.toString().equalsIgnoreCase("limit")){
             st.tokencode = TBaseType.cmtslashstar;//treat this token as a comment
         }
            return true;
     }
 }

 public class testITokenHandle extends TestCase {

     public void test1(){
         TGSqlParser sqlparser = new TGSqlParser(EDbVendor.dbvmysql);
         sqlparser.sqltext = "select * from dual limit";
         sqlparser.setTokenHandle(new myTokenHandle());

         assertTrue(sqlparser.parse() == 0);
     }

 }

  • Method Summary

    Modifier and Type
    Method
    Description
    boolean
    processToken(TSourceToken st)