Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
ConcatenatedInputStream |
|
| 1.6;1.6 | ||||
ConcatenatedInputStream$1 |
|
| 1.6;1.6 |
1 | 2 | /* |
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.commons.flatfile.util; | |
18 | ||
19 | import java.io.IOException; | |
20 | import java.io.InputStream; | |
21 | import java.util.Arrays; | |
22 | import java.util.Iterator; | |
23 | ||
24 | import org.apache.commons.lang3.Validate; | |
25 | ||
26 | /** | |
27 | * Unified InputStream representation of multiple concatenated InputStreams. | |
28 | * @version $Revision: 1301242 $ $Date: 2012-03-15 17:14:40 -0500 (Thu, 15 Mar 2012) $ | |
29 | */ | |
30 | public class ConcatenatedInputStream extends InputStream { | |
31 | /** EOF */ | |
32 | public static final int EOF = -1; | |
33 | ||
34 | 6 | private static final InputStream AT_EOF = new InputStream() { |
35 | public int read() throws IOException { | |
36 | 36 | return EOF; |
37 | } | |
38 | 2 | }; |
39 | ||
40 | private final Iterator<InputStream> iter; | |
41 | private InputStream current; | |
42 | ||
43 | /** | |
44 | * Create a new ConcatenatedInputStream. | |
45 | * @param src InputStreams | |
46 | */ | |
47 | 126 | public ConcatenatedInputStream(Iterable<InputStream> src) { |
48 | 126 | this.iter = Validate.notNull(src).iterator(); |
49 | 126 | next(); |
50 | 126 | } |
51 | ||
52 | /** | |
53 | * Create a new ConcatenatedInputStream. | |
54 | * @param src InputStreams | |
55 | */ | |
56 | public ConcatenatedInputStream(InputStream... src) { | |
57 | 126 | this(Arrays.asList(Validate.notNull(src))); |
58 | 126 | } |
59 | ||
60 | /** | |
61 | * {@inheritDoc} | |
62 | */ | |
63 | public int read() throws IOException { | |
64 | 696 | int n = current.read(); |
65 | 1090 | while (n == EOF && current != AT_EOF) { |
66 | 162 | next(); |
67 | 162 | n = current.read(); |
68 | } | |
69 | 696 | return n; |
70 | } | |
71 | ||
72 | /** | |
73 | * Position to the next InputStream | |
74 | */ | |
75 | private void next() { | |
76 | 288 | current = iter.hasNext() ? iter.next() : AT_EOF; |
77 | 288 | } |
78 | } |