|
1
2
3 package com.db4odoc.f1.refactoring;
4
5 import java.io.File  ;
6
7 import com.db4o.Db4o;
8 import com.db4o.ObjectContainer;
9 import com.db4o.ObjectSet;
10
11 public class RefactoringExample {
12 public final static String YAPFILENAME="formula1.yap";
13 public static void main(String [] args) {
14 System.out.println("Correct sequence of actions: ");
15 setObjects();
16 checkDB();
17 changeClass();
18 setNewObjects();
19 retrievePilotNew();
20
21
27
28 }
29
31 public static void setObjects(){
32 new File (YAPFILENAME).delete();
33 ObjectContainer oc = Db4o.openFile(YAPFILENAME);
34 try {
35 Pilot pilot = new Pilot("Rubens Barrichello");
36 oc.set(pilot);
37 pilot = new Pilot("Michael Schumacher");
38 oc.set(pilot);
39 } finally {
40 oc.close();
41 }
42 }
43
45 public static void setNewObjects(){
46 ObjectContainer oc = Db4o.openFile(YAPFILENAME);
47 try {
48 PilotNew pilot = new PilotNew("Rubens Barrichello",99);
49 oc.set(pilot);
50 pilot = new PilotNew("Michael Schumacher",100);
51 oc.set(pilot);
52 } finally {
53 oc.close();
54 }
55 }
56
58 public static void checkDB(){
59 ObjectContainer oc = Db4o.openFile(YAPFILENAME);
60 try {
61 ObjectSet result=oc.get(new Object ());
62 listResult(result);
63 } finally {
64 oc.close();
65 }
66 }
67
69 public static void changeClass(){
70 Db4o.configure().objectClass(Pilot.class).rename("com.db4odoc.f1.refactoring.PilotNew");
71 Db4o.configure().objectClass(PilotNew.class).objectField("name").rename("identity");
72 ObjectContainer oc = Db4o.openFile(YAPFILENAME);
73 oc.close();
74 }
75
77 public static void retrievePilotNew(){
78 ObjectContainer oc = Db4o.openFile(YAPFILENAME);
79 try {
80 ObjectSet result = oc.query(PilotNew.class);
81 listResult(result);
82 } finally {
83 oc.close();
84 }
85 }
86
88 public static void listResult(ObjectSet result) {
89 System.out.println(result.size());
90 while(result.hasNext()) {
91 System.out.println(result.next());
92 }
93 }
94 }
96 |
Popular Tags |
Java API By Example, From Geeks To Geeks.