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