1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.apache.jetspeed.cache.file;
18 import java.io.BufferedInputStream;
19 import java.io.BufferedOutputStream;
20 import java.io.DataInputStream;
21 import java.io.FileInputStream;
22 import java.io.FileOutputStream;
23 import java.io.IOException;
24 import java.io.InputStream;
25 import java.io.OutputStream;
26 import java.net.URL;
27
28 /*
29 * File Copy Utilities. Some utilities that java.io doesn't give us.
30 *
31 * copy() - copies one file source to another file destination.
32 * copyFromURL)() - copies from a URL source to a file destination.
33 *
34 * NOTE: tried to be a good Commons-citizen and use io out of the sandbox
35 * at the time it was dependent on an older version of commons-lang for a predicate class bs bs
36 *
37 * @author David S. Taylor <a href="mailto:taylor@apache.org">David Sean Taylor</a>
38 * @version $Id: FileCopy.java 516448 2007-03-09 16:25:47Z ate $
39 */
40
41 public class FileCopy
42 {
43 public static final int BUFFER_SIZE = 4096;
44
45 /*
46 * Copies one file source to another file destination.
47 *
48 * @param source The source file.
49 * @param destination The destination file.
50 * @throws IOException When an IO error occurs, this exception is thrown.
51 */
52 public static final void copy(String source, String destination)
53 throws IOException
54 {
55 byte[] buffer = new byte[BUFFER_SIZE];
56 BufferedInputStream input;
57 BufferedOutputStream output;
58
59 input = new BufferedInputStream(new FileInputStream(source));
60 output = new BufferedOutputStream(new FileOutputStream(destination));
61
62 copyStream(input, output, buffer);
63
64 input.close();
65 output.close();
66 }
67
68 /*
69 * Copies from a URL source to a file destination.
70 *
71 * @param source The source URL.
72 * @param destination The destination file.
73 * @throws IOException When an IO error occurs, this exception is thrown.
74 */
75 public static final void copyFromURL(String source, String destination)
76 throws IOException
77 {
78 byte[] buffer = new byte[BUFFER_SIZE];
79 URL url = new URL(source);
80 BufferedInputStream input;
81 BufferedOutputStream output;
82
83
84 input = new BufferedInputStream(new DataInputStream(url.openStream()));
85 output = new BufferedOutputStream(new FileOutputStream(destination));
86
87 copyStream(input, output, buffer);
88
89 input.close();
90 output.close();
91 }
92
93 /*
94 * Generic copy from a input stream to an output stream.
95 *
96 * @param input The source input stream.
97 * @param output The destination output stream.
98 * @param buffer The user provided buffer.
99 * @throws IOException When an IO error occurs, this exception is thrown.
100 */
101 public static final void copyStream(InputStream input,
102 OutputStream output,
103 byte[] buffer)
104 throws IOException
105 {
106 int bytesRead;
107
108 while((bytesRead = input.read(buffer)) != -1)
109 output.write(buffer, 0, bytesRead);
110 }
111
112 }