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comparison src/goodjava/io/FileClassLoader.java @ 1842:22f73129eb4a

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add load_jar
author Franklin Schmidt <fschmidt@gmail.com>
date Sat, 01 Feb 2025 16:54:41 -0700
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1841:08d650b31a80 1842:22f73129eb4a
1 package goodjava.io;
2
3 import java.io.File;
4 import java.io.FileInputStream;
5 import java.io.BufferedInputStream;
6 import java.io.IOException;
7 import java.net.URL;
8 import java.net.URLClassLoader;
9 import java.net.MalformedURLException;
10 import java.util.List;
11 import java.util.ArrayList;
12 import java.util.Map;
13 import java.util.HashMap;
14
15
16 public class FileClassLoader extends URLClassLoader {
17
18 public static final class FileInfo {
19 public final File file;
20 private final long checksum;
21
22 public FileInfo(File file) throws IOException {
23 this.file = file;
24 this.checksum = IoUtils.checksum( new BufferedInputStream( new FileInputStream(file) ) );
25 }
26
27 public boolean equals(Object obj) {
28 if( !(obj instanceof FileInfo) )
29 return false;
30 FileInfo fi = (FileInfo)obj;
31 return this.checksum==fi.checksum && this.file.getName().equals(fi.file.getName());
32 }
33
34 public int hashCode() {
35 return (int)checksum;
36 }
37 }
38
39 private static URL[] toURLs(List<FileInfo> files) {
40 int n = files.size();
41 URL[] urls = new URL[n];
42 for( int i=0; i<n; i++ ) {
43 try {
44 urls[i] = files.get(i).file.toURI().toURL();
45 } catch(MalformedURLException e) {
46 throw new RuntimeException(e);
47 }
48 }
49 return urls;
50 }
51
52 private final List<FileInfo> files;
53
54 private FileClassLoader(List<FileInfo> files) {
55 super(toURLs(files));
56 this.files = new ArrayList<FileInfo>(files);
57 }
58
59 public List<FileInfo> getFiles() {
60 return new ArrayList<FileInfo>(files);
61 }
62
63 private static final Map<List<FileInfo>,FileClassLoader> map = new HashMap<List<FileInfo>,FileClassLoader>();
64
65 public static synchronized FileClassLoader getFileClassLoader(List<FileInfo> files) {
66 FileClassLoader fcl = map.get(files);
67 if( fcl == null ) {
68 fcl = new FileClassLoader(files);
69 map.put(fcl.files,fcl);
70 }
71 return fcl;
72 }
73 }