1 /*
2 * Copyright 2007, 2008 Ange Optimization ApS
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16 /**
17 * @author Kim Hansen
18 */
19 package eu.simuline.octave.util;
20
21 import java.io.IOException;
22 import java.io.Reader;
23 import java.io.Writer;
24
25 /**
26 * Class for holding static utility functions for readers and writers:
27 * copy from reader to writer.
28 *
29 * @author Kim Hansen
30 */
31 public final class IOUtils {
32
33 private static final int BUFFER_SIZE = 8 * 1024;
34
35 private IOUtils() {
36 throw new UnsupportedOperationException("Do not instantiate");
37 }
38
39 /**
40 * @param reader
41 * @param writer
42 * @return The total chars copied
43 * @throws IOException
44 */
45 public static long copy(final Reader reader,
46 final Writer writer) throws IOException {
47 final char[] buffer = new char[BUFFER_SIZE];
48 long total = 0;
49 while (true) {
50 final int charsRead = reader.read(buffer, 0, BUFFER_SIZE);
51 if (charsRead == -1) {
52 break;
53 }
54 total += charsRead;
55 writer.write(buffer, 0, charsRead);
56 }
57 writer.flush();
58 return total;
59 }
60
61 }