// 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.ANamedParamExpr;
import nzdis.lang.oql.node.Token;
import java.util.Hashtable;
import java.util.Vector;

/**
 * Abstract strategy for OQL Pretty Printer.
 *
 *@author Mariusz Nowostawski
 *@version @version@ $Revision: 1.1 $
 */
abstract class OqlOutputStrategy {

  boolean needSpace = false;
  Vector indent = new Vector();
  int nlnum;

  public OqlOutputStrategy() {
    indent.addElement(new Integer(0));
    nlnum = 0;
  }
  
  public void pushIndent(int indentoffset) {
    indent.insertElementAt(new Integer(((Integer)indent.elementAt(0)).intValue()+indentoffset),0);
  }

  public void popIndent() {
    indent.removeElementAt(0);
  }

  abstract public void doSubst(ANamedParamExpr node, Hashtable context);
  abstract public void withoutSpace(Token node);
  abstract public void withSpace(Token node);
  abstract public void withNewLine(Token node);

}