secondo/Javagui/viewer/hoese/DsplGeneric.java

//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;

import  sj.lang.ListExpr;
import viewer.HoeseViewer;


/**
 * A generic implementation of the DsplBase Interface. Useful as baseclass to avoid
 * implementation of all the methods. If the datatype is unknown this class will be used.
 * @author  Thomas Hoese
 * @version 0.99 1.1.02
 */
public class DsplGeneric implements DsplBase {
  protected String AttrName;
  protected boolean selected;
  private boolean visible = true;

  /**
   * In relations it is neccessary to get the name of the attribute of this datatype instance in
   * a tuple.
   * @return attribute name
   * @see <a href="DsplGenericsrc.html#getAttrName">Source</a>
   */
  public String getAttrName () {
    return  AttrName;
  }
  /**
   * If this datatype shouldn't be displayed in the default 2D-geographical viewer this
   * method returns the specialized frame, which can do this.
   * @return null MainWindow will be used
   * @see generic.SecondoFrame
   * @see generic.MainWindow
   * @see <a href="DsplGenericsrc.html#getFrame">Source</a>
   */

  public SecondoFrame getFrame () {
    return  null;
  }



public void init(String name,
                 int nameWidth,
                 int indent,
                 ListExpr type,
                 ListExpr value,
                 QueryResult qr)
{
    String ts = "no display function defined";
    String N = extendString(name,nameWidth,indent);
    qr.addEntry(N + " : " + ts);
    return;
}





  /**
   * Sets the visibility of an object
   * @param b true=show false=hide
   * @see <a href="DsplGenericsrc.html#setVisible">Source</a>
   */
  public void setVisible (boolean b) {
    visible = b;
  }

  /**
   * Gets the visibility of an object
   * @return true if visible, false if not
   * @see <a href="DsplGenericsrc.html#getVisible">Source</a>
   */
  public boolean getVisible () {
    return  visible;
  }

  /**
   * Sets the select status of an object, textual or graphical.
   * @param b true if selected, false if not.
   * @see <a href="DsplGenericsrc.html#setSelected">Source</a>
   */
  public void setSelected (boolean b) {
    selected = b;
  }

  /**
   * Gets the select status of an object, textual or graphical
   * @return true if selected, false if not
   * @see <a href="DsplGenericsrc.html#getSelected">Source</a>
   */
  public boolean getSelected () {
    return  selected;
  }


 /** Adds spaces to S so that S has a minimum length of MinWidth **/
 public  static String extendStringRight(String S ,int MinWidth){
  //  String R = new String(S);
  // int NoSpaces=MinWidth-R.length();
  // for(int i=0;i<NoSpaces;i++)
  //    R = ' '+R;
  // R=R.replaceAll("\n", " ");
  // return R;
  String R = new String(S);
  while(R.length()<MinWidth){
     R += ' ';
  }
  R = R.replaceAll("\n"," ");
  return R;
  }

 /** Adds spaces to S so that S has a minimum length of MinWidth **/
 public  static String extendStringLeft(String S ,int MinWidth){
   String R = new String(S);
   int NoSpaces=MinWidth-R.length();
   for(int i=0;i<NoSpaces;i++)
      R = ' '+R;
   R=R.replaceAll("\n", " ");
   return R;
  }

  /** puts indent white spaces at the begin of S and extends S in that way
    * bay appending whitespaces that its minimum length is minWidth + indent
    **/
  public static String extendString(String S, int minWidth, int indent){
    String K = extendStringRight(S, minWidth);
    String ind = "";
    for(int i=0;i<indent;i++){
      ind += " ";
    }
    return ind + K;
  }




  /**
    * Checks whether LE described an undefined value.
    */
  public static boolean isUndefined(ListExpr LE){
    if(LE==null)
       return true;
    if(LE.atomType()==ListExpr.SYMBOL_ATOM){
       String v = LE.symbolValue().toLowerCase();
       return v.equals("undef") || v.equals("undefined") || v.equals("null");
    }
    if(LE.listLength()==1 && LE.first().atomType()==ListExpr.SYMBOL_ATOM){
       String v = LE.first().symbolValue().toLowerCase();
       return v.equals("undef") || v.equals("undefined") || v.equals("null");
    }
    return false;
  }


}