mfindbydatecommand.java

基于Java的软件信息系统－项目管理

package cmd;

import core.*;
import db.*;
import java.text.ParseException;
import java.util.*;
import javax.swing.JOptionPane;
import ui.EnterDateDialog;

public class MFindByDateCommand extends MDatabaseCommand
{
    private static final String [] PARAM_NAMES =
    { "date" };
    private static final String [] PARAM_PROMPTS =
    { "Enter date (mm/dd/yy):" };
    
    public MFindByDateCommand ()
	throws java.io.IOException
    {
	super ();
    }

    public String [] getParameterNames ()
    {
	return PARAM_NAMES;
    }
    
    public String [] getParameterPrompts ()
    {
	return PARAM_PROMPTS;
    }

    public void setParametersGUI ()
    {
        EnterDateDialog dlog = new EnterDateDialog (this);
        if (!dlog.isCanceled ())
        {
            setParameter("date", 
                         DBUtilities.formatDate (dlog.getDate()));
	    setInitialized ();
        }
    }

    protected void executeDatabaseCommand (HotelDB database)
    {
	try {
	    Date date = DBUtilities.parseDate (getParameter ("date"));
	    List reservations = database.getReservations (date);
            displayResults ("Reservations for " + getParameter ("date"),
                            reservations);
	} catch (java.text.ParseException e)
	{
	    System.err.println ("FindByDate: Error in date format: " +
				getParameter ("date"));
	    System.err.println ("Command not executed.");
	}
    }

    protected void displayResultsText (String title, List reservations)
    {
        System.out.println (title);
        if (reservations.size() > 0)
            DBUtilities.displayReservations (reservations);
        else
            System.out.println ("No reservations on date: " + 
                                getParameter ("date"));

    }

    public String getMenuName ()
    { return "Find By Date..."; }
    public String getName ()
    { return "date"; }
    public String getDescription ()
    { 
	return "Finds all reservations arriving on a given date.";
    }
    public Command makeInstance ()
    {
	try
	{
	    return new MFindByDateCommand ();
	} catch (java.io.IOException e)
	{
	    return null;
	}
    }
}