secondo/Javagui/viewer/hoese/algebras/Dsplperiods.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.algebras;

import  sj.lang.ListExpr;
import  viewer.*;
import viewer.hoese.*;
import  java.util.*;
import  javax.swing.*;
import  javax.swing.border.*;
import  java.awt.*;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import tools.Reporter;


/**
 * A displayclass for the periods-type (spatiotemp algebra), alphanumeric with TimePanel
 */
public class Dsplperiods extends DsplGeneric implements Timed, ExternDisplay {
  protected Vector Intervals = new Vector(10, 5);
  protected Interval TimeBounds;
  protected boolean err=true;
  protected boolean defined;
  protected String entry;

  /**
   * A method of the Timed-Interface to render the content of the TimePanel
   * @param PixelTime pixel per hour
   * @return A JPanel component with the renderer
   * @see <a href="Dsplperiodssrc.html#getTimeRenderer">Source</a>
   */
  public JPanel getTimeRenderer (double PixelTime) {
    if(!defined){
        return new JPanel();
    }
    JPanel jp = new JPanel(null);
    if (Intervals == null)
      return  null;
    ListIterator li = Intervals.listIterator();
    while (li.hasNext()) {
      Interval in = (Interval)li.next();
      int start = (int)((in.getStart() - TimeBounds.getStart())*PixelTime);
      int end = (int)((in.getEnd() - TimeBounds.getStart())*PixelTime);
      JLabel jc = new JLabel();
      jc.setOpaque(true);
      jc.setBackground(Color.yellow);
      jc.setPreferredSize(new Dimension(1, 10));
      jc.setBorder(new MatteBorder(2, (in.isLeftclosed()) ? 2 : 0, 2, (in.isRightclosed()) ?
          2 : 0, Color.black));
      Dimension d = jc.getPreferredSize();
      jc.setBounds(start, (int)d.getHeight()*0 + 15, end - start, (int)d.getHeight());
      jc.setToolTipText(LEUtils.convertTimeToString(in.getStart()) + "..." + 
          LEUtils.convertTimeToString(in.getEnd()));
      jp.setPreferredSize(new Dimension((int)((TimeBounds.getEnd() - TimeBounds.getStart())*PixelTime), 
          25));
      jp.add(jc);
    }
    return  jp;
  }

  /** returns the Timebounds of this object **/
  public Interval getBoundingInterval(){
    return TimeBounds;
  }

  /**
   * Scans the representation of a periods datatype and constructs the Intervals Vector
   * @param v A list of time intervals
   * @see sj.lang.ListExpr
   * @see <a href="Dsplperiodssrc.html#ScanValue">Source</a>
   */
  public String getString (ListExpr v) {
    if(isUndefined(v)){
        defined = false;
        err=false;
        return "undefined";
    }
    while (!v.isEmpty()) {
      ListExpr le = v.first();
      if (le.listLength() != 4){
        err=true;
        defined=false;
        return "<error>";
      }
      Interval in = LEUtils.readInterval(le);
      if (in == null){
        err=true;
        defined=false;
        return "<error>";
      }
      Intervals.add(in);
      v = v.rest();
    }
    defined = true;
    err = false;
    return "periods";
  }

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

 /** computes the timebounds for this objects **/
  private void computeTimeBounds(){
    TimeBounds = null;
    for (int i = 0; i < Intervals.size(); i++) {
      Interval in = (Interval)Intervals.elementAt(i);
      if(!in.isInfinite()){
					if (TimeBounds == null) {
						TimeBounds = in;
					} 
					else {
						TimeBounds = TimeBounds.union(in);
					}
      }
    }
  }

   public String toString(){
     return entry;
  }


  /** A method of the Timed-Interface
   * @return The Vector representation of the time intervals this instance is defined at 
   * @see <a href="Dsplperiodssrc.html#getIntervals">Source</a>
   */

  public Vector getIntervals(){
    return Intervals;
    } 


   public boolean isExternDisplayed(){
     if(display==null){
        return false;
     }
     return display.isVisible() && this.equals(display.getSource());
   }

   public void displayExtern(){
       if(display==null){
         display = new Display();
       }
       display.setSource(this);
       display.setVisible(true);
   }

   private static Display display;

   static class Display extends JFrame{
     private Dsplperiods src;
     private JTextArea textArea;
     private JButton closeBtn;

     Display(){
        getContentPane().setLayout(new BorderLayout());
        textArea = new JTextArea(40,20);
        textArea.setEditable(false);
        JScrollPane sp = new JScrollPane(textArea);
        getContentPane().add(sp, BorderLayout.CENTER);
        closeBtn = new JButton("close");
        closeBtn.addActionListener(new ActionListener(){
             public void actionPerformed(ActionEvent evt){
                 Display.this.setVisible(false);
             }
         });
         getContentPane().add(closeBtn,BorderLayout.SOUTH);
         setSize(640,480);
     }


     Dsplperiods getSource(){ 
        return src;
     }

     void setSource(Dsplperiods src){
        this.src = src;
        recomputeText();
     }
     
     
     private void recomputeText(){
        if(src==null){
           textArea.setText("No periods available");
           return;
        }
        if(src.err){
           textArea.setText("Wrong format of a periods value detected");
           return;
        }
        if(!src.defined){
           textArea.setText("Undefined");
           return;
        }
        if(src.Intervals.size()==0){
           textArea.setText("empty");
           return;
        }
        StringBuffer buff = new StringBuffer();
        for(int i=0;i<src.Intervals.size();i++){
          Interval iv = (Interval) src.Intervals.get(i);
          buff.append(""+iv+"\n");
        } 
        textArea.setText(buff.toString());

     }

   }


}