The Net: Ultimate Internet Guide/WWLCD1.ISO/pc/java/un2maiq4/pjjava/src/pj/util/localdatetime.java

Java Source | 1996-08-14 | 5.7 KB | 209 lines

/*---------------------------------------------------------------------------

    Written by the Personal Journal developers of Dow Jones & Company, Inc.

    Dow Jones makes no representations or warranties about
    the suitability of this software, either express or
    implied, including but not limited to the implied warranties
    of merchantability, fitness for a particular purpose,
    or non-infringement.  Dow Jones will not be liable for
    any damages suffered by a user as a result of using,
    modifying or distributing this software or its derivatives.


    @(#)LocalDateTime.java  1.00 05-Mar-96

        Continuos time update class.

    Authors:

        jlee     James Lee

    Version Ident:

        $Header$

    History:

        1.00 05-Mar-96  jlee      Initial Creation
             25-Mar-96  jlee      Added two more info item:free memory and total memory
                                  Changed the super class from Label to Canvas
---------------------------------------------------------------------------*/

package pj.util;

import pj.awt.PjFinals;

import java.awt.Canvas;
import java.awt.Event;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.TextField;
import java.lang.Thread;
import java.lang.Runnable;
import java.lang.Runtime;
import java.util.Date;

/**
 * Display the current time and date.
 *
 * @version 1.00 05-Mar-96
 * @author James Lee
*/
public class LocalDateTime extends Canvas implements Runnable
{
    // --- Instance variables

    private Thread      thDateTime;
    private Runtime     rtRunime;
    private Font        fntInfoBar = null;
    private FontMetrics fmInfoBar = null;
    private int         nTextHeight = 16;
    private int         nTextAscent = 0;
    private int         nType = 0;


    // --- Public constructors

    public LocalDateTime()

        {
        rtRunime = Runtime.getRuntime();

        thDateTime = new Thread( this );
        thDateTime.setPriority( Thread.NORM_PRIORITY );

        thDateTime.start();
        }

    // --- Public operations

    /**
     * Run the loop.
    */
    public void run()
        {
        while(true)
            {
            System.gc();
            repaint();

            try
                {
                Thread.sleep(5000);//5 second
                }
            catch (InterruptedException e)
                {
                }
            }
        }

    public void paint( Graphics g )
        {
        if ( fmInfoBar == null )
            {
            g.setFont( PjFinals.fntInfoBar );
            fmInfoBar = g.getFontMetrics();
            if (fmInfoBar != null)
                {
                nTextHeight = fmInfoBar.getHeight();
                nTextAscent = fmInfoBar.getAscent();
                }
            else
                System.out.println("Error-LocalDateTime-paint: getFontMetrics() returned null!");
            }

        switch ( nType )
            {
            case 0: //date and time
                g.drawString( getDateTime(), 1, (size().height - nTextHeight) / 2 + nTextAscent );
                break;
            case 1: //free memory
                g.drawString( "FreeMem:" + (rtRunime.freeMemory() / 1000) + "K", 1, (size().height - nTextHeight) / 2 + nTextAscent );
                break;
            case 2: //free memory
                g.drawString( "TotalMem:" + (rtRunime.totalMemory() / 1000) + "K", 1, (size().height - nTextHeight) / 2 + nTextAscent );
                break;
            default:
                break;
            }
        }


    public boolean handleEvent(Event evt)
        {
        switch (evt.id)
            {
            case Event.MOUSE_DOWN:
                nType = (nType + 1) % 3;
                System.out.println("Debug-LocalDateTime-handleEvent:nType=" + nType);
                return true;;
            default:
                break;
            }
        return false;
        }


    // --- Private operations

    private protected String getDateTime()
        {
        String strTime = new String();

        Date    date = new Date();
        String  strMonth[] = {"Jan.","Feb.","Mar.","Apr.","May","June", "July","Aug.","Sep.","Oct.","Nov.","Dec."};

        String  strDD = new String();
        String  strMM = new String();
        String  strYY = new String();

        String  strMMDDYY = new String();
        String  strTemp = new String();

        int     nMin = 0;
        int     nTemp = 0;
        boolean bIsPM = false;

        bIsPM = (date.getHours() >= 12) ? true: false;

        if( bIsPM )
            {
            nTemp = date.getHours();
            strTime = (nTemp == 12) ? String.valueOf( 12 ): String.valueOf( date.getHours() - 12 );
            }
        else
            {
            nTemp = date.getHours();
            strTime = (nTemp == 0) ? String.valueOf( 12 ): String.valueOf( nTemp );
            }

        strTime = strTime.concat(":");

        nMin = date.getMinutes();

        if( nMin >= 10 )
            strTime = strTime.concat( String.valueOf( nMin ) );
        else
            {
            strTime = strTime.concat("0");
            strTime = strTime.concat( String.valueOf( nMin ) );
            }

        strTime = bIsPM ? strTime.concat(" p.m. "): strTime.concat(" a.m. ");

        strDD = String.valueOf(date.getDate());
        strMM = strMonth[date.getMonth()];
        strYY = String.valueOf( date.getYear() + 1900 );

        strTemp = strTemp.concat(" " + strMM + " " + strDD + ", " + strYY );
        strTemp = strTime.concat(strTemp);

        return strTemp;
        }// getDateTime


} //LocalDateTime