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
18 package org.apache.log4j.lf5.util;
19
20 import java.io.ByteArrayOutputStream;
21 import java.io.IOException;
22 import java.io.InputStream;
23 import java.io.OutputStream;
24
25 /***
26 * Provides utility methods for input and output streams.
27 *
28 * @author Richard Wan
29 */
30
31 // Contributed by ThoughtWorks Inc.
32
33 public abstract class StreamUtils {
34 //--------------------------------------------------------------------------
35 // Constants:
36 //--------------------------------------------------------------------------
37
38 /***
39 * Default value is 2048.
40 */
41 public static final int DEFAULT_BUFFER_SIZE = 2048;
42
43 //--------------------------------------------------------------------------
44 // Protected Variables:
45 //--------------------------------------------------------------------------
46
47 //--------------------------------------------------------------------------
48 // Private Variables:
49 //--------------------------------------------------------------------------
50
51 //--------------------------------------------------------------------------
52 // Constructors:
53 //--------------------------------------------------------------------------
54
55 //--------------------------------------------------------------------------
56 // Public Methods:
57 //--------------------------------------------------------------------------
58
59 /***
60 * Copies information from the input stream to the output stream using
61 * a default buffer size of 2048 bytes.
62 * @throws java.io.IOException
63 */
64 public static void copy(InputStream input, OutputStream output)
65 throws IOException {
66 copy(input, output, DEFAULT_BUFFER_SIZE);
67 }
68
69 /***
70 * Copies information from the input stream to the output stream using
71 * the specified buffer size
72 * @throws java.io.IOException
73 */
74 public static void copy(InputStream input,
75 OutputStream output,
76 int bufferSize)
77 throws IOException {
78 byte[] buf = new byte[bufferSize];
79 int bytesRead = input.read(buf);
80 while (bytesRead != -1) {
81 output.write(buf, 0, bytesRead);
82 bytesRead = input.read(buf);
83 }
84 output.flush();
85 }
86
87 /***
88 * Copies information between specified streams and then closes
89 * both of the streams.
90 * @throws java.io.IOException
91 */
92 public static void copyThenClose(InputStream input, OutputStream output)
93 throws IOException {
94 copy(input, output);
95 input.close();
96 output.close();
97 }
98
99 /***
100 * @return a byte[] containing the information contained in the
101 * specified InputStream.
102 * @throws java.io.IOException
103 */
104 public static byte[] getBytes(InputStream input)
105 throws IOException {
106 ByteArrayOutputStream result = new ByteArrayOutputStream();
107 copy(input, result);
108 result.close();
109 return result.toByteArray();
110 }
111
112 //--------------------------------------------------------------------------
113 // Protected Methods:
114 //--------------------------------------------------------------------------
115
116 //--------------------------------------------------------------------------
117 // Private Methods:
118 //--------------------------------------------------------------------------
119
120 //--------------------------------------------------------------------------
121 // Nested Top-Level Classes or Interfaces
122 //--------------------------------------------------------------------------
123
124 }