//This file is part of SECONDO.

//Copyright (C) 2004, University in Hagen, Department of Computer Science, 
//Database Systems for New Applications.

//SECONDO is free software; you can redistribute it and/or modify
//it under the terms of the GNU General Public License as published by
//the Free Software Foundation; either version 2 of the License, or
//(at your option) any later version.

//SECONDO is distributed in the hope that it will be useful,
//but WITHOUT ANY WARRANTY; without even the implied warranty of
//MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//GNU General Public License for more details.

//You should have received a copy of the GNU General Public License
//along with SECONDO; if not, write to the Free Software
//Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA


package  viewer.hoese.algebras;

import  sj.lang.ListExpr;
import  viewer.*;
import viewer.hoese.*;


/**
 * A displayclass for the int-type, alphanumeric only
 */
public class Dsplint extends DsplGeneric implements  RenderAttribute, LabelAttribute {
   /** the value of this integer **/
   int value;
   /** the text to display **/
   String entry;
   /** flag for  defined state **/
   boolean defined;


   /** scans value and sets all internal variables **/
   private boolean scanValue(ListExpr value){
      if(isUndefined(value)){
          defined=false;
          this.value = 0;
          return true;
      } else {
        int at = value.atomType();
        if(at!=ListExpr.INT_ATOM){
          defined = false;
          this.value = 0;
          return false;
        }else{
           defined = true;
           this.value = value.intValue();
           return true;
        }
      }
   }

   /** scans the value, sets all internal variables and produces the
     * string of the value
     **/
   private String getString(ListExpr value){
    if(!scanValue(value)){
      return "<error>"; 
    } else if(defined){
      return ""+(this.value);
    } else{
      return "undefined"; 
    }
   }

  /**
   * This method is used to analyse the type and value in NestedList format and build
   * up the intern datastructures for this type. An alphanumeric representation is 
   * neccessary for the displaying this type in the queryresultlist.
   */
  public void init (String name, int nameWidth, int indent, ListExpr type, ListExpr value, QueryResult qr) {
    entry = extendString(name,nameWidth, indent) +" : "+ getString(value);
    qr.addEntry(this);
    return;
  }


  public String toString(){
      return entry;
  }

  /** returns the maximum value **/
  public double getMaxRenderValue(){
     return value;
  }
  /** returns the minimum value **/
  public double getMinRenderValue(){
     return value;
  }
  /** returns the current value **/
  public double getRenderValue(double time){
     return value;
  }
  /** returns true if this int is defined **/
  public boolean mayBeDefined(){
      return defined;
  }
  /** returns tre if this integer is defined **/
  public boolean isDefined(double time){
     return defined;
  }
 /** returns the label **/
  public String getLabel(double time){
    return defined?""+value:"undefined";
  }

}