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comparison src/cachingfilter/CachedDir.java @ 0:7ecd1a4ef557

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author Franklin Schmidt <fschmidt@gmail.com>
date Thu, 21 Mar 2019 19:15:52 -0600
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-1:000000000000 0:7ecd1a4ef557
1 package cachingfilter;
2
3 import java.io.File;
4 import java.io.IOException;
5 import org.slf4j.Logger;
6 import org.slf4j.LoggerFactory;
7
8
9 final class CachedDir implements CachedPage {
10 private static final Logger logger = LoggerFactory.getLogger(CachedDir.class);
11 private static final long tooLong = 1000L*60*10; // 10 minutes
12 private final File dir;
13 private File newFile;
14
15 CachedDir( File parent, String child ) {
16 this.dir = new File(parent,child);
17 }
18
19 public String name() {
20 return dir.getName();
21 }
22
23 public boolean exists() {
24 if( !dir.exists() )
25 return false;
26 File[] files = dir.listFiles();
27 if( files == null )
28 throw new RuntimeException("error doing listFiles of "+dir);
29 return files.length >= 1;
30 }
31
32 public File lastFile() {
33 File[] files = dir.listFiles();
34 if( files.length == 1 ) {
35 return files[0];
36 }
37 int n = 0;
38 File lastFile = null;
39 for( File file : files ) {
40 String name = file.getName();
41 int i = Integer.parseInt(name);
42 if( n < i ) {
43 if( lastFile != null )
44 lastFile.delete();
45 n = i;
46 lastFile = file;
47 } else {
48 file.delete();
49 }
50 }
51 if( lastFile==null )
52 throw new RuntimeException(dir.toString());
53 return lastFile;
54 }
55
56 public File newFile() throws IOException {
57 if( !dir.exists() && !dir.mkdir() )
58 throw new RuntimeException("couldn't create "+dir);
59 int n = 0;
60 for( File file : dir.listFiles() ) {
61 String name = file.getName();
62 int i = Integer.parseInt(name);
63 if( n < i )
64 n = i;
65 file.delete();
66 }
67 newFile = new File( dir, Integer.toString( n + 1 ) );
68 if( !newFile.createNewFile() )
69 throw new RuntimeException("couldn't create "+newFile);
70 return newFile;
71 }
72
73 public void deleteNewFile() {
74 if( !newFile.delete() )
75 throw new RuntimeException("couldn't delete new file "+newFile);
76 }
77
78 public boolean delete() {
79 File die = new File(dir.getParentFile(),"~die");
80 if( die.exists() ) {
81 for( File f : die.listFiles() ) {
82 if( !f.delete() ) {
83 logger.error("couldn't delete "+f);
84 return false;
85 }
86 }
87 if( !die.delete() ) {
88 logger.error("couldn't delete "+die);
89 return false;
90 }
91 }
92 return dir.renameTo(die);
93 }
94
95 public String toString() {
96 return dir.toString();
97 }
98
99 }