// This file is copyrighted and is part of nzdis-oql package. 
// See the file LICENSE for copyright information and the terms and conditions for copying, distributing and modifications of nzdis-oql package.
// @copyright@

package nzdis.lang.oql;

/**/
import nzdis.lang.oql.node.Node;
import java.util.Hashtable;


/**
 * Utility class for OQL Abstract Syntax Tree back to well-formed
 * ASCII representation. 
 *
 *@author Mariusz Nowostawski
 *@version @version@ $Revision: 1.1 $
 */
public class ToAscii {

  public static String toString(final String oql) {
    try{
      Node ast = TreeBuilder.getNode(oql, true);
      return toString(ast);
    }catch(Exception ex){
      ex.printStackTrace();
      return null;
    }
  }
  
  public static String toString(final Node ast){
    final Oql2AsciiWalker walker = new Oql2AsciiWalker();
    final OqlOutputStrategyString s = new OqlOutputStrategyString();
    walker.setStategy(s);
    ast.apply(walker);
    StringBuffer buf = s.toAscii();
    return buf.toString();
  }

  public static String toString(final Node ast, final Hashtable context){
    final Oql2AsciiWalker walker = new Oql2AsciiWalker();
    final OqlOutputStrategyString s = new OqlOutputStrategyString();
    walker.setStategy(s);
    walker.setContext(context);
    ast.apply(walker);
    StringBuffer buf = s.toAscii();
    return buf.toString();
  }

}