singleobjectcomboboxmodel.java

java+sql 图书管理系统

package MyLibraryok.borrow.ziliao;

import java.text.*;
import java.util.*;

import javax.swing.*;

/**
 * <p>Title: OpenSwing</p>
 *
 * <p>Description: 只有一个值的ComboBoxModel</p>
 *
 * <p>Copyright: Copyright (c) 2004</p>
 *
 * <p>Company: </p>
 *
 * @author <a href="mailto:[e-mail]">SunKing</a>
 * @version 1.0
 */
public class SingleObjectComboBoxModel extends AbstractListModel implements
    ComboBoxModel{
    private SimpleDateFormat dateFormat;
    private String selectedDate = "";

    public SingleObjectComboBoxModel(){
    }

    public SingleObjectComboBoxModel(SimpleDateFormat dateFormat){
        setDateFormat(dateFormat);
    }

    public void setDateFormat(SimpleDateFormat dateFormat){
        this.dateFormat = dateFormat;
    }

    public SimpleDateFormat getDateFormat(){
        return dateFormat;
    }

    public void setSelectedItem(Object anItem){
        if(anItem == null){
            return;
        }
        if(anItem instanceof Date){
            try{
                selectedDate = this.dateFormat.format((Date)anItem);
            } catch(Exception ex){
                ex.printStackTrace();
            }
        } else{
            try{
                String strDate = anItem.toString().trim();
                if(strDate.length() != 10 && strDate.length() != 19){
                    return;
                }
                String pattern = dateFormat.toPattern();
                if(strDate.length() == 10 && pattern.length() == 19){
                    strDate = strDate + selectedDate.substring(10);
                }
                dateFormat.parse(strDate);
                selectedDate = strDate;
            } catch(Exception ex){
                throw new UnsupportedOperationException(
                    "Invalid datetime: string [" + anItem
                    + "], format is [" + dateFormat.toPattern() + "]. ");
            }
        }
        fireContentsChanged(this, -1, -1);
    }

    public Object getSelectedItem(){
        return selectedDate;
    }

    public Object getElementAt(int index){
        return selectedDate;
    }

    public int getSize(){
        return 1;
    }
}