cancelreservationframe.java

数据结构及算法 对于参加ACM的学生有一定帮助 里面有详细的解答

//
//  Unified Library Application
//  Case study in Unified Modeling Language Toolkit
//
//  CancelReservationFrame.java
//
//
//  Copyright (c) 1998 John Wiley & Sons, Inc. All rights reserved.
//  Reproduction or translations of this work beyond that permitted
//  in Section 117 of the 1976 United States Copyright Act without
//  the express written permission of the copyright owner is unlawful.
//  Requests for further information should be addressed to Permissions
//  Department, John Wiley & Sons, Inc. The purchaser may make back-up
//  copies for his/her own use only and not for distribution or resale.
//  The Publisher assumes no responsibility for errors, omissions, or
//  damages, caused by the use of these programs of from the use of the
//  information contained herein.

package ui;

import util.ObjId;
import bo.*;

import java.awt.*;

public class CancelReservationFrame extends Frame implements ResultOfFindTitle {

	private Title title;
    private BorrowerInformation borrower;

	void findTitleButton_Clicked(Event event) {
		FindTitleDialog dlg = new FindTitleDialog(this,true);
		dlg.show();
	}

	void okButton_Clicked(Event event) {
	    if (title == null || borrowerList.getSelectedIndex() == -1)
        {
            new MessageBox(this,"Not all information given!");
        }
        else
        {
            Reservation res;
            String borrowername = borrowerList.getItem(borrowerList.getSelectedIndex());
            borrower = BorrowerInformation.findOnLastName(borrowername);
            int index = 0;
            while ( (res = borrower.getReservation(index)) != null)
            {
                if (res.getTitle().getTitle().equals(title.getTitle()))
                {
                    ObjId oid = res.getObjId();
                    borrower.removeReservation(oid);
                    borrower.update();
                    break;
                }
                index++;
            }
            index = 0;
            while ( (res = title.getReservation(index)) != null)
            {
                if (res.getBorrower().getLastName().equals(borrower.getLastName()))
                {
                    title.removeReservation(res.getObjId());
                    title.update();
                    break;
                }
                index++;
            }

            if (res == null)
            {
                new MessageBox(this,"There is no such reservation stored!");
                return;
            }
            res.delete();

		    dispose();
        }
	}

	void cancelButton_Clicked(Event event) {
		dispose();
	}

	void borrowerList_ListSelect(Event event) {
		checkStatus();
	}

    public void resultTitle(ObjId titleid)
    {
        title = Title.getTitle(titleid);
        titleField.setText(title.getTitle());
        authorField.setText(title.getAuthor());
        int noReservations = title.getNoReservations();
        for (int i = 0; i < noReservations; i++)
        {
            Reservation res = title.getReservation(i);
            BorrowerInformation borrow = res.getBorrower();
            borrowerList.addItem(borrow.getLastName());
        }
        checkStatus();
    }


    private void checkStatus()
    {
        if (title == null || borrowerList.getSelectedIndex() == -1)
            okButton.disable();
        else
            okButton.enable();
    }
	public CancelReservationFrame() {

		//{{INIT_CONTROLS
		setLayout(null);
		addNotify();
		resize(insets().left + insets().right + 430,insets().top + insets().bottom + 288);
		setFont(new Font("Dialog", Font.PLAIN, 12));
		titleField = new java.awt.TextField();
		titleField.setEditable(false);
		titleField.reshape(insets().left + 96,insets().top + 24,182,24);
		titleField.setBackground(new Color(12632256));
		add(titleField);
		label1 = new java.awt.Label("Title");
		label1.reshape(insets().left + 24,insets().top + 24,40,20);
		add(label1);
		authorField = new java.awt.TextField();
		authorField.setEditable(false);
		authorField.reshape(insets().left + 96,insets().top + 60,182,24);
		authorField.setBackground(new Color(12632256));
		add(authorField);
		label2 = new java.awt.Label("Author");
		label2.reshape(insets().left + 24,insets().top + 60,48,20);
		add(label2);
		findTitleButton = new java.awt.Button("Find Title");
		findTitleButton.reshape(insets().left + 288,insets().top + 24,108,24);
		add(findTitleButton);
		okButton = new java.awt.Button("OK (Reservation cancelled)");
		okButton.reshape(insets().left + 96,insets().top + 240,216,24);
		add(okButton);
		cancelButton = new java.awt.Button("Close");
		cancelButton.reshape(insets().left + 336,insets().top + 240,60,24);
		add(cancelButton);
		label3 = new java.awt.Label("Borrowers");
		label3.reshape(insets().left + 24,insets().top + 108,60,20);
		add(label3);
		borrowerList = new java.awt.List(0,false);
		add(borrowerList);
		borrowerList.reshape(insets().left + 96,insets().top + 108,178,107);
		setTitle("Remove Reservation");
		//}}
        okButton.disable();
		//{{INIT_MENUS
		//}}
	}

	public CancelReservationFrame(String title) {
	    this();
	    setTitle(title);
	}

    public synchronized void show() {
    	move(50, 50);
    	super.show();
    }

	public boolean handleEvent(Event event) {
    	if (event.id == Event.WINDOW_DESTROY) {
            dispose();
            return true;
    	}
		if (event.target == okButton && event.id == Event.ACTION_EVENT) {
			okButton_Clicked(event);
			return true;
		}
		if (event.target == cancelButton && event.id == Event.ACTION_EVENT) {
			cancelButton_Clicked(event);
			return true;
		}
		if (event.target == findTitleButton && event.id == Event.ACTION_EVENT) {
			findTitleButton_Clicked(event);
			return true;
		}
		if (event.target == borrowerList && event.id == Event.LIST_SELECT) {
			borrowerList_ListSelect(event);
			return true;
		}
		return super.handleEvent(event);
	}

	//{{DECLARE_CONTROLS
	java.awt.TextField titleField;
	java.awt.Label label1;
	java.awt.TextField authorField;
	java.awt.Label label2;
	java.awt.Button findTitleButton;
	java.awt.Button okButton;
	java.awt.Button cancelButton;
	java.awt.Label label3;
	java.awt.List borrowerList;
	//}}

	//{{DECLARE_MENUS
	//}}
}