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1
2
3 package com.db4odoc.f1.enums;
4
5 import java.awt.Color  ;
6 import java.io.File ;
7
8 import com.db4o.Db4o;
9 import com.db4o.ObjectContainer;
10 import com.db4o.ObjectSet;
11 import com.db4o.query.Query;
12 import com.db4odoc.f1.Util;
13
14
15 public class EnumExample extends Util {
16 public static void main(String [] args) {
17 setPilots();
18 checkPilots();
19
20 deletePilots();
21 checkPilots();
22 deleteQualification();
23 updateQualification();
24 }
25
27 public static void setCar(){
28 new File (Util.YAPFILENAME).delete();
29 ObjectContainer db=Db4o.openFile(Util.YAPFILENAME);
30 try {
31 Car car = new Car();
32 car.color = Color.GREEN;
33 db.set(car);
34 } finally {
35 db.close();
36 }
37 }
38
40 public static void setPilots(){
41 new File (Util.YAPFILENAME).delete();
42 ObjectContainer db=Db4o.openFile(Util.YAPFILENAME);
43 try {
44 db.set(new Pilot("Michael Schumacher",Qualification.WINNER));
45 db.set(new Pilot("Rubens Barrichello",Qualification.PROFESSIONAL));
46 } finally {
47 db.close();
48 }
49 }
50
52 public static void checkPilots(){
53 ObjectContainer db=Db4o.openFile(Util.YAPFILENAME);
54 try {
55 ObjectSet result = db.query(Pilot.class);
56 System.out.println("Saved pilots: " + result.size());
57 for(int x = 0; x < result.size(); x++){
58 Pilot pilot = (Pilot )result.get(x);
59 if (pilot.getQualification() == Qualification.WINNER){
60 System.out.println("Winner pilot: " + pilot);
61 } else if (pilot.getQualification() == Qualification.PROFESSIONAL){
62 System.out.println("Professional pilot: " + pilot);
63 } else {
64 System.out.println("Uncategorized pilot: " + pilot);
65 }
66 }
67 } finally {
68 db.close();
69 }
70 }
71
73 public static void updateQualification(){
74 System.out.println("Updating WINNER qualification constant");
75 ObjectContainer db=Db4o.openFile(Util.YAPFILENAME);
76 try {
77 Query query = db.query();
78 query.constrain(Qualification.class);
79 query.descend("qualification").constrain("WINNER");
80 ObjectSet result = query.execute();
81 for(int x = 0; x < result.size(); x++){
82 Qualification qualification = (Qualification)result.get(x);
83 qualification.testChange("WINNER2006");
84 db.set(qualification);
85 }
86 } finally {
87 db.close();
88 }
89 printQualification();
90 }
91
93 public static void deletePilots(){
94 System.out.println("Qualification enum before delete Pilots");
95 printQualification();
96 ObjectContainer db=Db4o.openFile(Util.YAPFILENAME);
97 db.ext().configure() .objectClass(Pilot.class).objectField("qualification").cascadeOnDelete(true);
98
99 try {
100 ObjectSet result = db.query(Pilot.class);
101 for(int x = 0; x < result.size(); x++){
102 Pilot pilot = (Pilot )result.get(x);
103 db.delete(pilot);
104 }
105 } finally {
106 db.close();
107 }
108 System.out.println("Qualification enum after delete Pilots");
109 printQualification();
110 }
111
113 public static void printQualification(){
114 ObjectContainer db=Db4o.openFile(Util.YAPFILENAME);
115 try {
116 ObjectSet result = db.query(Qualification.class);
117 System.out.println("results: " + result.size());
118 for(int x = 0; x < result.size(); x++){
119 Qualification pq = (Qualification)result.get(x);
120 System.out.println("Category: "+pq);
121 }
122 } finally {
123 db.close();
124 }
125 }
126
128 public static void deleteQualification(){
129 System.out.println("Explicit delete of Qualification enum");
130 ObjectContainer db=Db4o.openFile(Util.YAPFILENAME);
131 db.ext().configure() .objectClass(Qualification.class).cascadeOnDelete(true);
132 try {
133 ObjectSet result = db.query(Qualification.class);
134 for(int x = 0; x < result.size(); x++){
135 Qualification pq = (Qualification)result.get(x);
136 db.delete(pq);
137 }
138 } finally {
139 db.close();
140 }
141 printQualification();
142 }
143 }
145 |
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