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2 * Licensed to the Apache Software Foundation (ASF) under one *
3 * or more contributor license agreements. See the NOTICE file *
4 * distributed with this work for additional information *
5 * regarding copyright ownership. The ASF licenses this file *
6 * to you under the Apache License, Version 2.0 (the *
7 * "License"); you may not use this file except in compliance *
8 * with the License. You may obtain a copy of the License at *
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10 * http://www.apache.org/licenses/LICENSE-2.0 *
11 * *
12 * Unless required by applicable law or agreed to in writing, *
13 * software distributed under the License is distributed on an *
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY *
15 * KIND, either express or implied. See the License for the *
16 * specific language governing permissions and limitations *
17 * under the License. *
18 ****************************************************************/
19
20
21 package org.apache.james.mime4j.io;
22
23 import java.io.FilterInputStream;
24 import java.io.InputStream;
25 import java.io.IOException;
26
27 public class PositionInputStream extends FilterInputStream {
28
29 protected long position = 0;
30 private long markedPosition = 0;
31
32 public PositionInputStream(InputStream inputStream) {
33 super(inputStream);
34 }
35
36 public long getPosition() {
37 return position;
38 }
39
40 @Override
41 public int available() throws IOException {
42 return in.available();
43 }
44
45 @Override
46 public int read() throws IOException {
47 int b = in.read();
48 if (b != -1)
49 position++;
50 return b;
51 }
52
53 @Override
54 public void close() throws IOException {
55 in.close();
56 }
57
58 @Override
59 public void reset() throws IOException {
60 in.reset();
61 position = markedPosition;
62 }
63
64 @Override
65 public boolean markSupported() {
66 return in.markSupported();
67 }
68
69 @Override
70 public void mark(int readlimit) {
71 in.mark(readlimit);
72 markedPosition = position;
73 }
74
75 @Override
76 public long skip(long n) throws IOException {
77 final long c = in.skip(n);
78 if (c > 0)
79 position += c;
80 return c;
81 }
82
83 @Override
84 public int read(byte b[], int off, int len) throws IOException {
85 final int c = in.read(b, off, len);
86 if (c > 0)
87 position += c;
88 return c;
89 }
90
91 }