//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 bool-type, alphanumeric only
 */
public class Dsplbool extends DsplGeneric 
                      implements RenderAttribute, LabelAttribute { 
 /** the value of this boolean if defined **/
  boolean value;
  /** the defined flag of this boolean **/
  boolean defined;
  /** the text to display */
  String entry;
  /** the label **/
  String label;

  /** analyses the arguments, sets all internal variables except entry
    * and returns the string for displaying this value textual
    **/
  private String getString(ListExpr value){
    if(isUndefined(value)){
        defined=false;
        this.value=false;
        label = "undefined"; 
        return label;
    }
    if(value.atomType()!=ListExpr.BOOL_ATOM){
       defined=false;
       this.value = false;
       label = "<error>";
       return label;
    }
    defined = true;
    this.value = value.boolValue();
    label ="" + value;
    return label;
  }



  public void init (String name, int nameWidth, int indent, ListExpr type,
                    ListExpr value, QueryResult qr)
  {
     String T = name;
     String V = getString(value);
     T=extendString(T,nameWidth, indent);
     entry=(T + " : " + V);
     qr.addEntry(this);
     return;
  }

  public String toString(){
      return entry;
  }

  /** returns the maximum value **/
  public double getMaxRenderValue(){
     return value?1:0;
  }
  /** returns the minimum value **/
  public double getMinRenderValue(){
     return value?1:0;
  }
  /** returns the current value **/
  public double getRenderValue(double time){
     return value?1:0;
  }
  /** 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 label;
  }



}