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1 | package be.nikiroo.utils; |
2 | ||
59864f77 NR |
3 | import java.io.ByteArrayInputStream; |
4 | import java.io.Closeable; | |
5 | import java.io.File; | |
6 | import java.io.FileInputStream; | |
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7 | import java.io.IOException; |
8 | import java.io.InputStream; | |
9 | ||
10 | /** | |
11 | * This class represents an image data. | |
12 | * | |
13 | * @author niki | |
14 | */ | |
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15 | public class Image implements Closeable { |
16 | static private TempFiles tmpRepository; | |
17 | static private long count = 0; | |
18 | static private Object lock = new Object(); | |
19 | ||
20 | private File data; | |
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21 | |
22 | /** | |
23 | * Do not use -- for serialisation purposes only. | |
24 | */ | |
25 | @SuppressWarnings("unused") | |
26 | private Image() { | |
27 | } | |
28 | ||
29 | /** | |
30 | * Create a new {@link Image} with the given data. | |
31 | * | |
32 | * @param data | |
33 | * the data | |
34 | */ | |
35 | public Image(byte[] data) { | |
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36 | ByteArrayInputStream in = new ByteArrayInputStream(data); |
37 | try { | |
38 | this.data = getTemporaryFile(); | |
39 | IOUtils.write(in, this.data); | |
40 | } catch (IOException e) { | |
41 | throw new RuntimeException(e); | |
42 | } finally { | |
43 | try { | |
44 | in.close(); | |
45 | } catch (IOException e) { | |
46 | throw new RuntimeException(e); | |
47 | } | |
48 | } | |
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49 | } |
50 | ||
51 | /** | |
52 | * Create a new {@link Image} from its Base64 representation. | |
53 | * | |
54 | * @param base64 | |
55 | * the {@link Image} in Base64 format | |
56 | * | |
57 | * @throws IOException | |
58 | * in case of I/O error | |
59 | */ | |
60 | public Image(String base64) throws IOException { | |
61 | this(Base64.decode(base64)); | |
62 | } | |
63 | ||
64 | /** | |
65 | * Create a new {@link Image} from a stream. | |
66 | * | |
67 | * @param in | |
68 | * the stream | |
69 | * | |
70 | * @throws IOException | |
71 | * in case of I/O error | |
72 | */ | |
73 | public Image(InputStream in) throws IOException { | |
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74 | data = getTemporaryFile(); |
75 | IOUtils.write(in, data); | |
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76 | } |
77 | ||
78 | /** | |
59864f77 | 79 | * <b>Read</b> the actual image data, as a byte array. |
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80 | * |
81 | * @return the image data | |
82 | */ | |
83 | public byte[] getData() { | |
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84 | try { |
85 | FileInputStream in = new FileInputStream(data); | |
86 | try { | |
87 | return IOUtils.toByteArray(in); | |
88 | } finally { | |
89 | in.close(); | |
90 | } | |
91 | } catch (IOException e) { | |
92 | throw new RuntimeException(e); | |
93 | } | |
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94 | } |
95 | ||
96 | /** | |
97 | * Convert the given {@link Image} object into a Base64 representation of | |
98 | * the same {@link Image} object. | |
99 | * | |
100 | * @return the Base64 representation | |
101 | */ | |
102 | public String toBase64() { | |
0988831f | 103 | return Base64.encodeBytes(getData()); |
80500544 | 104 | } |
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105 | |
106 | /** | |
107 | * Closing the {@link Image} will delete the associated temporary file on | |
108 | * disk. | |
109 | * <p> | |
110 | * Note that even if you don't, the program will still <b>try</b> to delete | |
111 | * all the temporary files at JVM termination. | |
112 | */ | |
113 | @Override | |
114 | public void close() throws IOException { | |
115 | data.delete(); | |
116 | synchronized (lock) { | |
117 | count--; | |
118 | if (count <= 0) { | |
119 | count = 0; | |
120 | tmpRepository.close(); | |
121 | tmpRepository = null; | |
122 | } | |
123 | } | |
124 | } | |
125 | ||
126 | @Override | |
127 | protected void finalize() throws Throwable { | |
128 | try { | |
129 | close(); | |
130 | } finally { | |
131 | super.finalize(); | |
132 | } | |
133 | } | |
134 | ||
135 | /** | |
136 | * Return a newly created temporary file to work on. | |
137 | * | |
138 | * @return the file | |
139 | * | |
140 | * @throws IOException | |
141 | * in case of I/O error | |
142 | */ | |
143 | private File getTemporaryFile() throws IOException { | |
144 | synchronized (lock) { | |
145 | if (tmpRepository == null) { | |
146 | tmpRepository = new TempFiles("images"); | |
147 | count = 0; | |
148 | } | |
149 | ||
150 | count++; | |
151 | ||
152 | return tmpRepository.createTempFile("image"); | |
153 | } | |
154 | } | |
80500544 | 155 | } |