001/*
002 * Copyright 2014 Konik.io
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *  http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016package io.konik.carriage.utils;
017
018import java.io.FilterInputStream;
019import java.io.IOException;
020import java.io.InputStream;
021
022/**
023 * 
024 * Input Stream that also counting Byte Bytes.
025 */
026public final class ByteCountingInputStream extends FilterInputStream {
027   private int byteCount;
028   private int mark = -1;
029
030   /**
031    * Instantiates a new byte counting input stream.
032    * @param in the in
033    */
034   public ByteCountingInputStream(InputStream in) {
035      super(in);
036   }
037
038   /**
039    * Returns bytes read.
040    *
041    * @return the count
042    */
043   public int getByteCount() {
044      return byteCount;
045   }
046
047   @Override
048   public int read() throws IOException {
049      int result = in.read();
050      if (result != -1) {
051         byteCount++;
052      }
053      return result;
054   }
055
056   @Override
057   public int read(byte[] b, int off, int len) throws IOException {
058      int read = in.read(b, off, len);
059      if (read != -1) {
060         byteCount += read;
061      }
062      return read;
063   }
064
065   @Override
066   public long skip(long n) throws IOException {
067      long skip = in.skip(n);
068      byteCount += skip;
069      return skip;
070   }
071
072   @Override
073   public synchronized void mark(int readlimit) {
074      in.mark(readlimit);
075      mark = byteCount;
076   }
077
078   @Override
079   public synchronized void reset() throws IOException {
080      if (!in.markSupported()) { throw new IOException("Mark is not supported"); }
081      if (mark == -1) { throw new IOException("Mark not set"); }
082      in.reset();
083      byteCount = mark;
084   }
085}