Mercurial > dive4elements > gnv-client

comparison gnv-artifacts/src/main/java/de/intevation/gnv/utils/FileUtils.java @ 1119:7c4f81f74c47

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merged gnv-artifacts
author Thomas Arendsen Hein <thomas@intevation.de>
date Fri, 28 Sep 2012 12:14:00 +0200
parents f953c9a559d8
children
comparison
equal deleted inserted replaced
1027:fca4b5eb8d2f 1119:7c4f81f74c47
1 /*
2 * Copyright (c) 2010 by Intevation GmbH
3 *
4 * This program is free software under the LGPL (>=v2.1)
5 * Read the file LGPL.txt coming with the software for details
6 * or visit http://www.gnu.org/licenses/ if it does not exist.
7 */
8
9 package de.intevation.gnv.utils;
10
11 import java.io.BufferedInputStream;
12 import java.io.File;
13 import java.io.FileInputStream;
14 import java.io.IOException;
15 import java.io.InputStream;
16 import java.io.OutputStream;
17
18 import java.util.Stack;
19
20 import java.util.zip.ZipEntry;
21 import java.util.zip.ZipOutputStream;
22
23 /**
24 * A helper class to provide some methods for working with files and
25 * directories.
26 *
27 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
28 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
29 */
30 public final class FileUtils
31 {
32 private FileUtils() {
33 }
34
35 /**
36 * Deletes everything in a directory.
37 *
38 * @param dir The directory.
39 */
40 public final static void deleteContent(File dir) {
41 if (dir == null || !dir.isDirectory()) {
42 return;
43 }
44
45 File[] files = dir.listFiles();
46 if (files != null) {
47 for (File file: files) {
48 deleteRecursive(file);
49 }
50 }
51
52 return;
53 }
54
55 /**
56 * Delete <i>file</i> and everything in <i>file</i> if it is a directory.
57 *
58 * @param file The file or directory.
59 * @return true, if deletion was successful - otherwise false.
60 */
61 public final static boolean deleteRecursive(File file) {
62
63 if (file == null) {
64 return false;
65 }
66
67 if (file.isDirectory()) {
68 File [] files = file.listFiles();
69 if (files != null) {
70 for (File sub: files) {
71 if (!deleteRecursive(sub)) {
72 return false;
73 }
74 }
75 }
76 }
77
78 return file.delete();
79 }
80
81 /**
82 * Put the given file or directory into a zip archive.
83 *
84 * @param file The file or directory.
85 * @param outputStream The stream to write the archive to.
86 * @throws IOException if an error occured while zip creation or writing to
87 * output stream.
88 */
89 public static void createZipArchive(
90 File file,
91 OutputStream outputStream
92 )
93 throws IOException
94 {
95 ZipOutputStream out = new ZipOutputStream(outputStream);
96
97 if (file.isFile()) {
98 copyFileToZip("", file, out);
99 }
100 else if (file.isDirectory()) {
101
102 Stack<PrefixDir> stack = new Stack<PrefixDir>();
103 stack.push(new PrefixDir(file.getName() + "/", file));
104
105 while (!stack.isEmpty()) {
106 PrefixDir pd = stack.pop();
107
108 ZipEntry dirEntry = new ZipEntry(pd.prefix);
109 out.putNextEntry(dirEntry);
110 out.closeEntry();
111
112 File [] files = pd.dir.listFiles();
113 if (files != null) {
114 for (File sub: files) {
115 if (sub.isDirectory()) {
116 stack.push(new PrefixDir(
117 pd.prefix + sub.getName() + "/",
118 sub));
119 }
120 else if (sub.isFile()) {
121 copyFileToZip(pd.prefix, sub, out);
122 }
123 }
124 }
125 }
126 }
127
128 out.finish();
129 }
130
131 /**
132 * A class representing a directory with a prefix.
133 */
134 private static final class PrefixDir {
135
136 String prefix;
137 File dir;
138
139 public PrefixDir(String prefix, File dir) {
140 this.prefix = prefix;
141 this.dir = dir;
142 }
143
144 } // class PrefixDir
145
146 /**
147 * Write a file to zip archive.
148 *
149 * @param prefix A prefix.
150 * @param file The file.
151 * @param out The output stream.
152 * @throws IOException if an error occured while writing to zip output
153 * stream.
154 */
155 private static void copyFileToZip(
156 String prefix,
157 File file,
158 ZipOutputStream out
159 )
160 throws IOException
161 {
162 String entryName = prefix + file.getName();
163 ZipEntry entry = new ZipEntry(entryName);
164 out.putNextEntry(entry);
165 InputStream in = null;
166 try {
167 in =
168 new BufferedInputStream(
169 new FileInputStream(file), 20*1024);
170
171 byte [] buf = new byte[2048];
172
173 int r;
174 while ((r = in.read(buf)) > 0) {
175 out.write(buf, 0, r);
176 }
177 }
178 finally {
179 if (in != null) {
180 try { in.close(); }
181 catch (IOException ioe) {}
182 }
183 }
184 out.closeEntry();
185 }
186 }
187 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :
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