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1
6
7 package org.jfox.persistent;
8
9 import java.io.File  ;
10 import java.io.FileInputStream ;
11 import java.io.FileOutputStream ;
12 import java.io.IOException ;
13 import java.io.ObjectInputStream ;
14 import java.io.ObjectOutputStream ;
15 import java.io.Serializable ;
16 import java.util.Date ;
17
18 import org.jfox.ioc.Component;
19 import org.jfox.ioc.ComponentContext;
20
21
22
25
26 public class FilePersistenter implements Persistenter, Component {
27
28 private String directory = ".";
29
30 public FilePersistenter() {
31
32 }
33
34 public FilePersistenter(String directory) {
35 this.directory = directory;
36 }
37
38 public synchronized Object load(Object identity) throws Exception {
39 if(identity == null) throw new IllegalArgumentException ("identity can not be null.");
40
41 Object result = null;
42 ObjectInputStream ois = null;
43 File file = null;
44 try {
45 String filename = getFullFileName(identity);
46 file = new File (filename);
47 ois = new ObjectInputStream (new FileInputStream (file));
48 result = ois.readObject();
49 }
50 catch(Exception e) {
51 throw e;
52 }
53 finally {
54 try {
55 ois.close();
56 if(file != null) {
57 file.delete();
58 }
59 }
60 catch(IOException e) {
61 }
62 }
63 return result;
64 }
65
66 public synchronized void store(Object identity, Serializable data) throws Exception {
68 if(identity == null || data == null) throw new IllegalArgumentException ("identity and data can not be null.");
69 String filename = getFullFileName(identity);
70 ObjectOutputStream oos = null;
71 try {
72 oos = new ObjectOutputStream (new FileOutputStream (filename));
73 oos.writeObject(data);
74 }
75 catch(Exception e) {
76 throw e;
77 }
78 finally {
79 try {
80 oos.close();
81 }
82 catch(IOException e) {
83 e.printStackTrace();
84 }
85 }
86 }
87
88 public boolean remove(Object identity) {
89 if(identity == null) throw new IllegalArgumentException ("identity can not be null.");
90 try {
91 String filename = getFullFileName(identity);
92 File file = new File (filename);
93 return file.delete();
94 }
95 catch(Exception e) {
96 e.printStackTrace();
97 return false;
98 }
99
100 }
101
102 private String getFullFileName(Object identity) {
103 return directory + File.separator + identity.toString() + ".ser";
104 }
105
106
107 public void setComponentContext(ComponentContext ctx) {
108 directory = ctx.getModuleDir() + File.separator + "temp";
109 }
110
111 public static void main(String [] args) throws Exception {
112 Date date = new Date ();
113 FilePersistenter fp = new FilePersistenter();
114 String identity = "test";
115 fp.store(identity, date);
116 Date serDate = (Date ) fp.load(identity);
117 System.out.println(serDate.toString());
118 }
119
120 }
121
122
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