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1
2
3 package com.db4odoc.f1.reflections;
4
5
6 import java.io.File  ;
7 import java.io.IOException ;
8
9 import com.db4o.Db4o;
10 import com.db4o.ObjectContainer;
11 import com.db4o.ObjectSet;
12 import com.db4o.query.Query;
13 import com.db4o.reflect.ReflectClass;
14 import com.db4o.reflect.ReflectConstructor;
15 import com.db4o.reflect.ReflectField;
16 import com.db4o.reflect.ReflectMethod;
17 import com.db4o.reflect.generic.GenericReflector;
18
19 public class ReflectorExample {
20 public final static String YAPFILENAME="formula1.yap";
21 public static void main(String [] args) throws IOException {
22 setCars();
23 getReflectorInfo();
24 getCars();
25 getCarInfo();
26 }
27
29 public static void setCars()
30 {
31 new File (YAPFILENAME).delete();
32 ObjectContainer db=Db4o.openFile(YAPFILENAME);
33 try {
34 Car car1 = new Car("BMW");
35 db.set(car1);
36 Car car2 = new Car("Ferrari");
37 db.set(car2);
38
39 System.out.println("Saved:");
40 Query query = db.query();
41 query.constrain(Car.class);
42 ObjectSet results = query.execute();
43 listResult(results);
44 } finally {
45 db.close();
46 }
47 }
48
50 public static void getCars()
51 {
52 ObjectContainer db=Db4o.openFile(YAPFILENAME);
53 try {
54 GenericReflector reflector = new GenericReflector(null,db.ext().reflector());
55 ReflectClass carClass = reflector.forName(Car.class.getName());
56 System.out.println("Reflected class "+carClass);
57 System.out.println("Retrieved with reflector:");
58 Query query = db.query();
59 query.constrain(carClass);
60 ObjectSet results = query.execute();
61 listResult(results);
62 } finally {
63 db.close();
64 }
65 }
66
68 public static void getCarInfo()
69 {
70 ObjectContainer db=Db4o.openFile(YAPFILENAME);
71 try {
72 GenericReflector reflector = new GenericReflector(null,db.ext().reflector());
73 ReflectClass carClass = reflector.forName(Car.class.getName());
74 System.out.println("Reflected class "+carClass);
75 System.out.println("FIELDS:");
77 ReflectField[] fields = carClass.getDeclaredFields();
78 for (int i = 0; i < fields.length; i++)
79 System.out.println(fields[i].getName());
80
81 System.out.println("CONSTRUCTORS:");
83 ReflectConstructor[] cons = carClass.getDeclaredConstructors();
84 for (int i = 0; i < cons.length; i++)
85 System.out.println( cons[i]);
86
87 System.out.println("METHODS:");
89 ReflectMethod method = carClass.getMethod("getPilot",null);
90 System.out.println(method.getClass());
91
92 } finally {
93 db.close();
94 }
95 }
96
98 public static void getReflectorInfo()
99 {
100 ObjectContainer db=Db4o.openFile(YAPFILENAME);
101 try {
102 System.out.println("Reflector in use: " + db.ext().reflector());
103 System.out.println("Reflector delegate" +db.ext().reflector().getDelegate());
104 ReflectClass[] knownClasses = db.ext().reflector().knownClasses();
105 int count = knownClasses.length;
106 System.out.println("Known classes: " + count);
107 for (int i=0; i <knownClasses.length; i++){
108 System.out.println(knownClasses[i]);
109 }
110 } finally {
111 db.close();
112 }
113 }
114
116 public static void testReflector()
117 {
118 LoggingReflector logger = new LoggingReflector();
119 Db4o.configure().reflectWith(logger);
120 ObjectContainer db=Db4o.openFile(YAPFILENAME);
121 try {
122 ReflectClass rc = db.ext().reflector().forName(Car.class.getName());
123 System.out.println("Reflected class: " + rc);
124 } finally {
125 db.close();
126 }
127 }
128
130 public static void listResult(ObjectSet result) {
131 System.out.println(result.size());
132 while(result.hasNext()) {
133 System.out.println(result.next());
134 }
135 }
136 }
138 |
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