001 /****************************************************************
002 * Licensed to the Apache Software Foundation (ASF) under one *
003 * or more contributor license agreements. See the NOTICE file *
004 * distributed with this work for additional information *
005 * regarding copyright ownership. The ASF licenses this file *
006 * to you under the Apache License, Version 2.0 (the *
007 * "License"); you may not use this file except in compliance *
008 * with the License. You may obtain a copy of the License at *
009 * *
010 * http://www.apache.org/licenses/LICENSE-2.0 *
011 * *
012 * Unless required by applicable law or agreed to in writing, *
013 * software distributed under the License is distributed on an *
014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY *
015 * KIND, either express or implied. See the License for the *
016 * specific language governing permissions and limitations *
017 * under the License. *
018 ****************************************************************/
019
020
021 package org.apache.james.mime4j.io;
022
023 import java.io.FilterInputStream;
024 import java.io.InputStream;
025 import java.io.IOException;
026
027 public class PositionInputStream extends FilterInputStream {
028
029 protected long position = 0;
030 private long markedPosition = 0;
031
032 public PositionInputStream(InputStream inputStream) {
033 super(inputStream);
034 }
035
036 public long getPosition() {
037 return position;
038 }
039
040 @Override
041 public int available() throws IOException {
042 return in.available();
043 }
044
045 @Override
046 public int read() throws IOException {
047 int b = in.read();
048 if (b != -1)
049 position++;
050 return b;
051 }
052
053 @Override
054 public void close() throws IOException {
055 in.close();
056 }
057
058 @Override
059 public void reset() throws IOException {
060 in.reset();
061 position = markedPosition;
062 }
063
064 @Override
065 public boolean markSupported() {
066 return in.markSupported();
067 }
068
069 @Override
070 public void mark(int readlimit) {
071 in.mark(readlimit);
072 markedPosition = position;
073 }
074
075 @Override
076 public long skip(long n) throws IOException {
077 final long c = in.skip(n);
078 if (c > 0)
079 position += c;
080 return c;
081 }
082
083 @Override
084 public int read(byte b[], int off, int len) throws IOException {
085 final int c = in.read(b, off, len);
086 if (c > 0)
087 position += c;
088 return c;
089 }
090
091 }