Homework 4.2-1: Visitor pattern
作业要求：Study the following figure 1, figure 2 and figure 3 about the visitor solution of the sport-shoe store problem. Also you can read the source code about the implementation of the problem. Then,
1) Write code for ShoeInfoVisitor to implement all the methods in this class to get descriptions of all the kind of shoes
2) Also in the client class SportsShoesGUI, add necessary methods to get the information about the selected shoes
Figure 1. SportShoes hierarchy
Figure 2. visitor hierarchy
Figure 3. the visitor pattern solution
1 import java.awt.*;
2 import java.awt.event.*;
3 import javax.swing.*;
4
5 public class SportsShoesGUI extends JFrame implements ItemListener{
6 private JScrollPane dataPane,textPane,checkBoxPane;
7 private JSplitPane bigSplitPane,upSplitPane;
8 private JPanel checkBoxPanel, btnPanel, choicePanel;
9 private JButton submitBtn, exitBtn;
10 private JTextArea txtAreaPrice, txtAreaData;
11 private Dimension minimumSize;
12 private JCheckBox sport, walking, nike, mephisto, northFace,
13 running, adidas, ponyMexico, salomon,
14 skating,globeBlitz, globeAppleyard,dCShoesRover;
15
16 public final int SELECTED = ItemEvent.SELECTED;
17 public final int DESELECTED = ItemEvent.DESELECTED;
18 private int[] states;
19 private float total=0;
20
21 public SportsShoesGUI(){
22 super("Visitor Pattern Example with JCheckbox");
23 minimumSize = new Dimension(130, 100);
24
25 states = new int[20];
26 setUpChoicePanel();
27 setUpScrollPanes();
28 }
29
30 private void setUpChoicePanel(){
31 submitBtn = new JButton("Submit");
32 submitBtn.addActionListener( new ButtonActionListener());
33
34 exitBtn = new JButton("Exit");
35 exitBtn.addActionListener( new ButtonActionListener());
36
37 JPanel btnPanel =new JPanel();
38 btnPanel.add(submitBtn);
39 btnPanel.add(exitBtn);
40
41 //Create the check boxes.
42 sport = new JCheckBox("SportShoes");
43 walking = new JCheckBox("Walking");
44 nike = new JCheckBox("Nike");
45 mephisto = new JCheckBox("Mephisto");
46 northFace = new JCheckBox("NorthFace");
47 running = new JCheckBox("Running");
48 adidas = new JCheckBox("Adidas");
49 ponyMexico = new JCheckBox("PonyMexico");
50 salomon = new JCheckBox("Salomon");
51 skating = new JCheckBox("Skating");
52 globeBlitz = new JCheckBox(" GlobeBlitz");
53 globeAppleyard = new JCheckBox("GlobeAppleyard");
54 dCShoesRover = new JCheckBox("DCShoesRover");
55
56 sport.setMnemonic(KeyEvent.VK_C);
57 walking.setMnemonic(KeyEvent.VK_C);
58 nike.setMnemonic(KeyEvent.VK_C);
59 mephisto.setMnemonic(KeyEvent.VK_C);
60 northFace.setMnemonic(KeyEvent.VK_C);
61 running.setMnemonic(KeyEvent.VK_C);
62 adidas.setMnemonic(KeyEvent.VK_C);
63 ponyMexico.setMnemonic(KeyEvent.VK_C);
64 salomon.setMnemonic(KeyEvent.VK_C);
65 skating.setMnemonic(KeyEvent.VK_C);
66 globeBlitz.setMnemonic(KeyEvent.VK_C);
67 globeAppleyard.setMnemonic(KeyEvent.VK_C);
68 dCShoesRover.setMnemonic(KeyEvent.VK_C);
69
70 //Register a listener for the check boxes.
71 sport.addItemListener(this);
72 walking.addItemListener(this);
73 nike.addItemListener(this);
74 mephisto.addItemListener(this);
75 northFace.addItemListener(this);
76 running.addItemListener(this);
77 adidas.addItemListener(this);
78 ponyMexico.addItemListener(this);
79 salomon.addItemListener(this);
80 skating.addItemListener(this);
81 globeBlitz.addItemListener(this);
82 globeAppleyard.addItemListener(this);
83 dCShoesRover.addItemListener(this);
84
85 //Set up the picture label
86 checkBoxPanel = new JPanel();
87
88 // Use gridbag layout to place all buttons
89 GridBagLayout gridbag = new GridBagLayout();
90 checkBoxPanel.setLayout(gridbag);
91 GridBagConstraints gbc = new GridBagConstraints();
92
93 checkBoxPanel.add(sport);
94 checkBoxPanel.add(walking);
95 checkBoxPanel.add(nike);
96 checkBoxPanel.add(mephisto);
97 checkBoxPanel.add(northFace);
98 checkBoxPanel.add(running);
99 checkBoxPanel.add(adidas);
100 checkBoxPanel.add(ponyMexico);
101 checkBoxPanel.add(salomon);
102 checkBoxPanel.add(skating);
103 checkBoxPanel.add(globeBlitz);
104 checkBoxPanel.add(globeAppleyard);
105 checkBoxPanel.add(dCShoesRover);
106
107 gbc.insets.top = 0;
108 gbc.insets.bottom = 0;
109 gbc.insets.left = 0;
110 gbc.insets.right = 0;
111
112 gbc.anchor = GridBagConstraints.WEST;
113
114 gbc.gridx = 0;
115 gbc.gridy = 0;
116 gridbag.setConstraints(sport, gbc);
117
118 gbc.gridx = 1;
119 gbc.gridy = 1;
120 gridbag.setConstraints(walking, gbc);
121 gbc.gridx = 2;
122 gbc.gridy = 2;
123 gridbag.setConstraints(nike, gbc);
124 gbc.gridx = 2;
125 gbc.gridy = 3;
126 gridbag.setConstraints(mephisto, gbc);
127 gbc.gridx = 2;
128 gbc.gridy = 4;
129 gridbag.setConstraints(northFace, gbc);
130 gbc.gridx = 1;
131 gbc.gridy = 5;
132 gridbag.setConstraints(running, gbc);
133 gbc.gridx = 2;
134 gbc.gridy = 6;
135 gridbag.setConstraints(adidas, gbc);
136 gbc.gridx = 2;
137 gbc.gridy = 7;
138 gridbag.setConstraints(ponyMexico, gbc);
139 gbc.gridx = 2;
140 gbc.gridy = 8;
141 gridbag.setConstraints(salomon, gbc);
142 gbc.gridx = 1;
143 gbc.gridy = 9;
144 gridbag.setConstraints(skating, gbc);
145 gbc.gridx = 2;
146 gbc.gridy = 10;
147 gridbag.setConstraints(globeBlitz, gbc);
148 gbc.gridx = 2;
149 gbc.gridy = 11;
150 gridbag.setConstraints(globeAppleyard, gbc);
151 gbc.gridx = 2;
152 gbc.gridy = 12;
153 gridbag.setConstraints(dCShoesRover, gbc);
154
155 choicePanel = new JPanel();
156 choicePanel.setMinimumSize(new Dimension(500, 300));
157 choicePanel.setLayout(new BorderLayout());
158
159 choicePanel.add(checkBoxPanel, "Center");
160 choicePanel.add(btnPanel, "South");
161 }
162
163 // All the scroll panes are set up
164 private void setUpScrollPanes(){
165 txtAreaPrice = new JTextArea(3,10);
166 txtAreaData = new JTextArea(3,10);
167 dataPane = new JScrollPane(txtAreaData);
168 dataPane.setMinimumSize(minimumSize);
169 checkBoxPane = new JScrollPane(choicePanel);
170 checkBoxPane.getViewport().setBackground(Color.green);
171 upSplitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT);
172 upSplitPane.setLeftComponent(checkBoxPane);
173 upSplitPane.setRightComponent(dataPane);
174 textPane = new JScrollPane(txtAreaPrice);
175 textPane.setMinimumSize(new Dimension(100, 100));
176 upSplitPane.setDividerLocation(300);
177 upSplitPane.setPreferredSize(new Dimension(500, 200));
178 bigSplitPane = new JSplitPane(JSplitPane.VERTICAL_SPLIT, upSplitPane, textPane);
179 bigSplitPane.setDividerLocation(350);
180
181 getContentPane().add(bigSplitPane);
182 setSize(new Dimension(500, 300));
183 setVisible(true);
184 }
185
186 //==========================================================
187 // ͬѧ����Ҫ��Ȿ���������漰��createObjects(ActionEvent e)
188 // ����������ֻ��Ҫ���2�д��뼴�������ҵ��
189 //==========================================================
190 class ButtonActionListener implements ActionListener{
191 public void actionPerformed(ActionEvent e) {
192 total=0;
193 txtAreaPrice.append("\n============New Order ==============\n");
194 createObjects(e);
195 }
196 }
197
198 public void itemStateChanged(ItemEvent e){
199 Object source = e.getItemSelectable();
200 int state = e.getStateChange();
201
202 if (source == sport) {
203 if(state == SELECTED){
204 walking.setSelected(true);
205 running.setSelected(true);
206 skating.setSelected(true);
207 }
208 else if (state == DESELECTED){
209 walking.setSelected(false);
210 running.setSelected(false);
211 skating.setSelected(false);
212 }
213 states[0]=state;
214 }
215 else if (source == walking) {
216 if(state == SELECTED){
217 nike.setSelected(true);
218 mephisto.setSelected(true);
219 northFace.setSelected(true);
220 }
221 else if (state == DESELECTED){
222 nike.setSelected(false);
223 mephisto.setSelected(false);
224 northFace.setSelected(false);
225 }
226 states[1]=state;
227 }
228 else if (source == nike)
229 states[2]=state;
230 else if (source == mephisto)
231 states[3]=state;
232 else if (source == northFace)
233 states[4] = state;
234 else if (source == running) {
235 if (state == SELECTED) {
236 adidas.setSelected(true);
237 ponyMexico.setSelected(true);
238 salomon.setSelected(true);
239 }
240 else if (state == DESELECTED){
241 adidas.setSelected(false);
242 ponyMexico.setSelected(false);
243 salomon.setSelected(false);
244 }
245 states[5]=state;
246 }
247 else if (source == adidas)
248 states[6]=state;
249 else if (source == ponyMexico)
250 states[7]=state;
251 else if (source == salomon)
252 states[8]=state;
253 else if (source == skating) {
254 if(state == SELECTED) {
255 globeBlitz.setSelected(true);
256 globeAppleyard.setSelected(true);
257 dCShoesRover.setSelected(true);
258 }
259 else if (state == DESELECTED){
260 globeBlitz.setSelected(false);
261 globeAppleyard.setSelected(false);
262 dCShoesRover.setSelected(false);
263 }
264 states[9]=state;
265 }
266 else if (source == globeBlitz)
267 states[10]=state;
268 else if (source == globeAppleyard)
269 states[11]=state;
270 else if (source == dCShoesRover)
271 states[12]=state;
272 }
273
274 private void createObjects(ActionEvent e){
275 PriceVisitor pv = new PriceVisitor();
276 ShoeInfoVisitor sv = new ShoeInfoVisitor();
277 SportShoes shoes = null;
278 int len = states.length;
279
280 if (e.getActionCommand().equals("Submit")) {
281 for(int m = 0; m < len; m++ ){
282 if ((m==0) && (states[0] == SELECTED)) {
283 txtAreaPrice.append("/" + "Sport shoes; includes all type \n");
284 }
285 else if ((m==1) && (states[1] == SELECTED)) {
286 txtAreaPrice.append("/" + "Walking Sheos \n");
287 }
288 else if ((m==2) && (states[2] == SELECTED)) {
289 txtAreaPrice.append("/" + "Nike");
290 shoes = new Nike();
291 }
292 else if ((m==3) && (states[3] == SELECTED)) {
293 txtAreaPrice.append("/" + "Mephisto");
294 shoes = new Mephisto();
295 }
296 else if ((m==4) && (states[4] == SELECTED)) {
297 txtAreaPrice.append("/" + "NorthFace");
298 shoes = new NorthFace();
299 }
300 else if ((m==5) && (states[5] == SELECTED)) {
301 txtAreaPrice.append("/" + "Running Shoes: \n");
302 }
303 else if ((m==6) && (states[6] == SELECTED)) {
304 txtAreaPrice.append("/" + "Adidas");
305 shoes = new Adidas();
306 }
307 else if ((m==7) && (states[7] == SELECTED)){
308 txtAreaPrice.append("/" + "Pony Mexico");
309 shoes = new PonyMexico();
310 }
311 else if ((m==8) && (states[8] == SELECTED)){
312 txtAreaPrice.append("/" + "Salomon");
313 shoes = new Salomon();
314 }
315 else if ((m==9) && (states[9] == SELECTED)) {
316 txtAreaPrice.append("/" + "Skating shoes include 3 items: \n");
317 }
318 else if ((m==10) && (states[10] == SELECTED)) {
319 txtAreaPrice.append("/" + "GlobeBlitz");
320 shoes = new GlobeBlitz();
321 }
322 else if ((m==11) && (states[11] == SELECTED)){
323 txtAreaPrice.append("/" + "Globe Appleyard");
324 shoes = new GlobeAppleyard();
325 }
326 else if ((m==12) && (states[12] == SELECTED)){
327 txtAreaPrice.append("/" + "DC Shoes Rover ");
328 shoes = new DCShoesRover();
329 }
330
331 if(shoes != null){
332 shoes.accept(pv);
333 shoes.accept(sv);
334 txtAreaPrice.append(" Price: " + pv.getShoesPrice()+"\n");
335 shoes = null;
336 }
337 } //end for loop
338
339 total = pv.getPriceTotal();
340 txtAreaPrice.append("\n Total Price: " + total);
341
342
343 }
344 else if (e.getActionCommand().equals("Exit")) {
345 System.exit(1);
346 }
347 }
348
349 //--------------------------------------------------------------
350 public static void main(String args[]){
351 try {
352 UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
353 }
354 catch (Exception evt) {}
355
356 SportsShoesGUI frame = new SportsShoesGUI();
357 frame.addWindowListener(new WindowAdapter(){
358 public void windowClosing(WindowEvent e){
359 System.exit(0);
360 }
361 });
362 frame.setSize(500, 600);
363 frame.setVisible(true);
364 }
365 }
1 abstract class SportShoes{
2
3 public abstract void accept(Visitor vis);
4 public abstract double getPrice();
5 public abstract String getDescription();
6 }
1 public abstract class WalkingSheos extends SportShoes{
2 public abstract double getPrice();
3 public abstract String getDescription();
4 public abstract void accept(Visitor v);
5 }
1 public abstract class RunningShoes extends SportShoes{
2
3 public abstract double getPrice();
4 public abstract String getDescription();
5 public abstract void accept(Visitor v);
6 }
1 public abstract class SkatingShoes extends SportShoes{
2
3 public abstract double getPrice();
4 public abstract String getDescription();
5 public abstract void accept(Visitor v);
6
7 }
1 public class Nike extends WalkingSheos{
2
3 public double getPrice(){
4 return 44.98;
5 }
6
7 public String getDescription(){
8 return "Nike, produced in US";
9 }
10
11 public void accept(Visitor v){
12 System.out.println("Nike has been visited.");
13 v.visitNike(this);
14 }
15 }
1 public class Mephisto extends WalkingSheos{
2
3 public double getPrice(){
4 return 384.98;
5 }
6
7 public String getDescription(){
8 return "Mephisto, produced in US";
9 }
10
11 public void accept(Visitor v){
12 System.out.println("Mephisto has been visited.");
13 v.visitMephisto(this);
14 }
15 }
1 public class NorthFace extends WalkingSheos{
2
3 public double getPrice(){
4 return 99.95;
5 }
6
7 public String getDescription(){
8 return "NorthFace, produced in US";
9 }
10
11 public void accept(Visitor v){
12 System.out.println("NorthFace has been visited.");
13 v.visitNorthFace(this);
14 }
15 }
1 public class Adidas extends RunningShoes{
2
3 public double getPrice(){
4 return 93.53;
5 }
6
7 public String getDescription(){
8 return "Adidas, made in US.";
9
10 }
11
12 public void accept(Visitor v){
13 System.out.println("Adidas has been visited.");
14 v.visitAdidas(this);
15 }
16 }
1 public class PonyMexico extends RunningShoes{
2
3 public double getPrice(){
4 return 33.64;
5 }
6
7 public String getDescription(){
8 return "PonyMexico, produced in US";
9 }
10
11 public void accept(Visitor v){
12 System.out.println("PonyMexico has been visited.");
13 v.visitPonyMexico(this);
14 }
15 }
1 public class Salomon extends RunningShoes{
2
3 public double getPrice(){
4 return 103.95;
5 }
6
7 public String getDescription(){
8 return "Salomon, produced in US";
9 }
10
11 public void accept(Visitor v){
12 System.out.println("Salomon has been visited.");
13 v.visitSalomon(this);
14 }
15 }
1 public class GlobeBlitz extends SkatingShoes{
2
3 public double getPrice(){
4 return 60.00;
5 }
6
7 public String getDescription(){
8 return "GlobeBlitz, produced in US";
9 }
10
11 public void accept(Visitor v){
12 System.out.println("GlobeBlitz has been visited.");
13 v.visitGlobeBlitz(this);
14 }
15 }
1 public class GlobeAppleyard extends SkatingShoes{
2
3 public double getPrice(){
4 return 69.99;
5 }
6
7 public String getDescription(){
8 return "GlobeAppleyard, produced in US";
9 }
10
11 public void accept(Visitor v){
12 System.out.println("GlobeAppleyard has been visited.");
13 v.visitGlobeAppleyard(this);
14 }
15 }
1 public class DCShoesRover extends SkatingShoes{
2
3 public double getPrice(){
4 return 99.95;
5 }
6
7 public String getDescription(){
8 return "DCShoesRover, produced in US";
9 }
10
11 public void accept(Visitor v){
12 System.out.println("DCShoesRover has been visited.");
13 v.visitDCShoesRover(this);
14 }
15 }
1 public abstract class Visitor
2 {
3 public abstract void visitAdidas(Adidas e);
4 public abstract void visitSalomon(Salomon e);
5 public abstract void visitPonyMexico(PonyMexico e);
6 public abstract void visitNorthFace (NorthFace e);
7 public abstract void visitNike(Nike e);
8 public abstract void visitMephisto(Mephisto e);
9 public abstract void visitGlobeBlitz (GlobeBlitz e);
10 public abstract void visitGlobeAppleyard(GlobeAppleyard e);
11 public abstract void visitDCShoesRover(DCShoesRover e);
12 }
1 public class PriceVisitor extends Visitor{
2 private float total;
3 private double shoesPrice;
4
5 public PriceVisitor(){
6 total = 0;
7 }
8
9 public void visitAdidas(Adidas e){
10 shoesPrice = e.getPrice();
11 total += shoesPrice;
12 }
13 public void visitSalomon(Salomon e){
14 shoesPrice = e.getPrice();
15 total += shoesPrice;
16 }
17 public void visitPonyMexico(PonyMexico e){
18 shoesPrice = e.getPrice();
19 total += shoesPrice;
20 }
21 public void visitNorthFace (NorthFace e){
22 shoesPrice = e.getPrice();
23 total += shoesPrice;
24 }
25 public void visitNike(Nike e){
26 shoesPrice = e.getPrice();
27 total += shoesPrice;
28 }
29 public void visitMephisto(Mephisto e){
30 shoesPrice = e.getPrice();
31 total += shoesPrice;
32 }
33 public void visitGlobeBlitz (GlobeBlitz e){
34 shoesPrice = e.getPrice();
35 total += shoesPrice;
36 }
37 public void visitGlobeAppleyard(GlobeAppleyard e){
38 shoesPrice = e.getPrice();
39 total += shoesPrice;
40 }
41 public void visitDCShoesRover(DCShoesRover e){
42 shoesPrice = e.getPrice();
43 total += shoesPrice;
44 }
45
46 public double getShoesPrice(){
47 return shoesPrice;
48 }
49 public float getPriceTotal(){
50 return total;
51 }
52 }
1 import java.util.Vector;
2
3 public class ShoeInfoVisitor extends Visitor{
4
5 private String[] s = new String[9];
6
7 public String describeShoes() {
8 String infoStr ="\n";
9 for(int n=0; n< 9; n++){
10 if(s[n] != null){
11 infoStr = infoStr + s[n]+"\n";
12 }
13 }
14 return infoStr;
15 }
16
17 public void visitAdidas(Adidas e){
18 // write code here. ��s[0]��
19 }
20 public void visitSalomon(Salomon e){
21 // write code hereֵ
22 }
23 public void visitPonyMexico(PonyMexico e){
24 // write code here
25 }
26 public void visitNorthFace (NorthFace e){
27 // write code here
28 }
29 public void visitNike(Nike e){
30 // write code here
31 }
32 public void visitMephisto(Mephisto e){
33 // write code here
34 }
35 public void visitGlobeBlitz (GlobeBlitz e){
36 // write code here
37 }
38 public void visitGlobeAppleyard(GlobeAppleyard e){
39 // write code here
40 }
41 public void visitDCShoesRover(DCShoesRover e){
42 // write code here����s[8]��ֵ
43 }
44 }
Report Part
1． Answer the following
l Which class have you written code for?
l What code have you added to what class to show the shoe information to the screen?
2． Do the following
a) Explain how method accept(Visitor v) works.
b) How a node class is visited?
3． (测试) Typical input and output from running your finished program