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1 package cachingfilter;
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2
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3 import java.io.File;
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4 import java.io.IOException;
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5 import org.slf4j.Logger;
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6 import org.slf4j.LoggerFactory;
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7
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8
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9 final class CachedDir implements CachedPage {
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10 private static final Logger logger = LoggerFactory.getLogger(CachedDir.class);
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11 private static final long tooLong = 1000L*60*10; // 10 minutes
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12 private final File dir;
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13 private File newFile;
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14
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15 CachedDir( File parent, String child ) {
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16 this.dir = new File(parent,child);
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17 }
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18
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19 public String name() {
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20 return dir.getName();
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21 }
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22
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23 public boolean exists() {
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24 if( !dir.exists() )
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25 return false;
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26 File[] files = dir.listFiles();
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27 if( files == null )
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28 throw new RuntimeException("error doing listFiles of "+dir);
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29 return files.length >= 1;
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30 }
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31
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32 public File lastFile() {
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33 File[] files = dir.listFiles();
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34 if( files.length == 1 ) {
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35 return files[0];
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36 }
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37 int n = 0;
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38 File lastFile = null;
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39 for( File file : files ) {
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40 String name = file.getName();
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41 int i = Integer.parseInt(name);
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42 if( n < i ) {
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43 if( lastFile != null )
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44 lastFile.delete();
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45 n = i;
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46 lastFile = file;
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47 } else {
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48 file.delete();
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49 }
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50 }
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51 if( lastFile==null )
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52 throw new RuntimeException(dir.toString());
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53 return lastFile;
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54 }
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55
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56 public File newFile() throws IOException {
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57 if( !dir.exists() && !dir.mkdir() )
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58 throw new RuntimeException("couldn't create "+dir);
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59 int n = 0;
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60 for( File file : dir.listFiles() ) {
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61 String name = file.getName();
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62 int i = Integer.parseInt(name);
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63 if( n < i )
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64 n = i;
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65 file.delete();
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66 }
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67 newFile = new File( dir, Integer.toString( n + 1 ) );
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68 if( !newFile.createNewFile() )
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69 throw new RuntimeException("couldn't create "+newFile);
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70 return newFile;
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71 }
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72
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73 public void deleteNewFile() {
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74 if( !newFile.delete() )
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75 throw new RuntimeException("couldn't delete new file "+newFile);
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76 }
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77
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78 public boolean delete() {
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79 File die = new File(dir.getParentFile(),"~die");
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80 if( die.exists() ) {
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81 for( File f : die.listFiles() ) {
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82 if( !f.delete() ) {
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83 logger.error("couldn't delete "+f);
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84 return false;
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85 }
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86 }
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87 if( !die.delete() ) {
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88 logger.error("couldn't delete "+die);
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89 return false;
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90 }
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91 }
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92 return dir.renameTo(die);
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93 }
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94
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95 public String toString() {
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96 return dir.toString();
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97 }
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98
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99 }
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