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annotate src/goodjava/io/FileClassLoader.java @ 2021:b8e5d53c4fc9
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| author | Franklin Schmidt <fschmidt@gmail.com> |
|---|---|
| date | Mon, 20 Oct 2025 14:45:27 -0600 |
| parents | bcb015265c21 |
| children |
| rev | line source |
|---|---|
| 1842 | 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; | |
|
1844
9147ce7f5b72
FileClassLoader use SoftCacheMap
Franklin Schmidt <fschmidt@gmail.com>
parents:
1842
diff
changeset
|
13 import goodjava.util.SoftCacheMap; |
| 1842 | 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 | |
|
1860
bcb015265c21
better uniqueClassLoader
Franklin Schmidt <fschmidt@gmail.com>
parents:
1859
diff
changeset
|
27 @Override public boolean equals(Object obj) { |
| 1842 | 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 | |
|
1860
bcb015265c21
better uniqueClassLoader
Franklin Schmidt <fschmidt@gmail.com>
parents:
1859
diff
changeset
|
34 @Override public int hashCode() { |
| 1842 | 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 | |
| 1859 | 54 public FileClassLoader(List<FileInfo> files) { |
| 1842 | 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 | |
|
1844
9147ce7f5b72
FileClassLoader use SoftCacheMap
Franklin Schmidt <fschmidt@gmail.com>
parents:
1842
diff
changeset
|
63 private static final Map<List<FileInfo>,FileClassLoader> map = new SoftCacheMap<List<FileInfo>,FileClassLoader>(); |
| 1842 | 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 } |