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18 package org.apache.log4j.rolling.helper;
19
20 import org.apache.log4j.helpers.LogLog;
21
22 import java.io.File;
23 import java.io.FileInputStream;
24 import java.io.FileOutputStream;
25 import java.io.IOException;
26
27 import java.util.zip.GZIPOutputStream;
28
29
30 /***
31 * Compresses a file using GZ compression.
32 *
33 * @author Curt Arnold
34 */
35 public final class GZCompressAction extends ActionBase {
36 /***
37 * Source file.
38 */
39 private final File source;
40
41 /***
42 * Destination file.
43 */
44 private final File destination;
45
46 /***
47 * If true, attempt to delete file on completion.
48 */
49 private final boolean deleteSource;
50
51
52 /***
53 * Create new instance of GZCompressAction.
54 *
55 * @param source file to compress, may not be null.
56 * @param destination compressed file, may not be null.
57 * @param deleteSource if true, attempt to delete file on completion. Failure to delete
58 * does not cause an exception to be thrown or affect return value.
59 */
60 public GZCompressAction(
61 final File source, final File destination, final boolean deleteSource) {
62 if (source == null) {
63 throw new NullPointerException("source");
64 }
65
66 if (destination == null) {
67 throw new NullPointerException("destination");
68 }
69
70 this.source = source;
71 this.destination = destination;
72 this.deleteSource = deleteSource;
73 }
74
75 /***
76 * Compress.
77 * @return true if successfully compressed.
78 * @throws IOException on IO exception.
79 */
80 public boolean execute() throws IOException {
81 return execute(source, destination, deleteSource);
82 }
83
84 /***
85 * Compress a file.
86 *
87 * @param source file to compress, may not be null.
88 * @param destination compressed file, may not be null.
89 * @param deleteSource if true, attempt to delete file on completion. Failure to delete
90 * does not cause an exception to be thrown or affect return value.
91 * @return true if source file compressed.
92 * @throws IOException on IO exception.
93 */
94 public static boolean execute(
95 final File source, final File destination, final boolean deleteSource)
96 throws IOException {
97 if (source.exists()) {
98 FileInputStream fis = new FileInputStream(source);
99 FileOutputStream fos = new FileOutputStream(destination);
100 GZIPOutputStream gzos = new GZIPOutputStream(fos);
101 byte[] inbuf = new byte[8102];
102 int n;
103
104 while ((n = fis.read(inbuf)) != -1) {
105 gzos.write(inbuf, 0, n);
106 }
107
108 gzos.close();
109 fis.close();
110
111 if (deleteSource && !source.delete()) {
112 LogLog.warn("Unable to delete " + source.toString() + ".");
113 }
114
115 return true;
116 }
117
118 return false;
119 }
120
121
122 /***
123 * Capture exception.
124 *
125 * @param ex exception.
126 */
127 protected void reportException(final Exception ex) {
128 LogLog.warn("Exception during compression of '" + source.toString() + "'.", ex);
129 }
130
131 }