|
1
25 package org.snipsnap.util;
26
27 import java.io.*;
28 import java.net.URL  ;
29 import java.util.*;
30
31
36 public class Checksum {
37 private String id;
38 private Map checksums;
39
40 public Checksum(File file) throws IOException {
41 load(file);
42 }
43
44 public Checksum(URL url) throws IOException {
45 load(url);
46 }
47
48 public Checksum(String id) {
49 this(id, new HashMap());
50 }
51
52 public Checksum(String id, Map init) {
53 this.id = id;
54 this.checksums = init;
55 }
56
57 public String getId() {
58 return id;
59 }
60
61 public void add(String file, Long checksum) {
62 checksums.put(file, checksum);
63 }
64
65 public Long get(String file) {
66 return (Long ) checksums.get(file);
67 }
68
69 public Set compareChanged(Checksum other) {
70 Set result = new TreeSet();
71 Iterator it = checksums.keySet().iterator();
72 while (it.hasNext()) {
73 String key = (String ) it.next();
74 if (!checksums.get(key).equals(other.get(key))) {
75 result.add(key);
76 }
77 }
78 return result;
79 }
80
81 public Set getFileNames() {
82 return checksums.keySet();
83 }
84
85 public Set compareUnchanged(Checksum other) {
86 Set result = new TreeSet();
87 Iterator it = checksums.keySet().iterator();
88 while (it.hasNext()) {
89 String key = (String ) it.next();
90 if (checksums.get(key).equals(other.get(key))) {
91 result.add(key);
92 }
93 }
94 return result;
95 }
96
97 public void store(File file) throws IOException {
98 Iterator it = checksums.keySet().iterator();
99 Properties save = new Properties();
100 while (it.hasNext()) {
101 String name = (String ) it.next();
102 save.setProperty(name, Long.toHexString(((Long ) checksums.get(name)).longValue()));
103 }
104 OutputStream out = new FileOutputStream(file);
105 save.setProperty("ID", id);
106 save.store(out, "checksums for " + id);
107 out.close();
108 }
109
110 public void load(File file) throws IOException {
111 load(new FileInputStream(file));
112 }
113
114 public void load(URL url) throws IOException {
115 load(url.openStream());
116 }
117
118 private void load(InputStream in) throws IOException {
119 checksums = new HashMap();
120 Properties load = new Properties();
121 load.load(in);
122 Iterator it = load.keySet().iterator();
123 while (it.hasNext()) {
124 String key = (String ) it.next();
125 if(!"ID".equals(key)) {
126 checksums.put(key, new Long (Long.parseLong(load.getProperty(key), 16)));
127 }
128 }
129 id = load.getProperty("ID");
130 }
131
132 public String toString() {
133 return "Checksum[id=" + id + ", " + checksums.toString() + "]";
134 }
135 }
136 |
Popular Tags |
Java API By Example, From Geeks To Geeks.