org.apache.commons.io.input
Class CountingInputStream

java.lang.Object
  java.io.InputStream
      java.io.FilterInputStream
          org.apache.commons.io.input.ProxyInputStream
              org.apache.commons.io.input.CountingInputStream

All Implemented Interfaces:

Closeable

public class CountingInputStream
extends ProxyInputStream

A decorating input stream that counts the number of bytes that have passed through the stream so far.

A typical use case would be during debugging, to ensure that data is being read as expected.

Version:

$Id: CountingInputStream.java 1304052 2012-03-22 20:55:29Z ggregory $

Field Summary

Fields inherited from class java.io.FilterInputStream

in

Constructor Summary

CountingInputStream(InputStream in)
Constructs a new CountingInputStream.

Method Summary

protected void	afterRead(int n) Adds the number of read bytes to the count.
long	getByteCount() The number of bytes that have passed through this stream.
int	getCount() The number of bytes that have passed through this stream.
long	resetByteCount() Set the byte count back to 0.
int	resetCount() Set the byte count back to 0.
long	skip(long length) Skips the stream over the specified number of bytes, adding the skipped amount to the count.

Methods inherited from class org.apache.commons.io.input.ProxyInputStream

available, beforeRead, close, handleIOException, mark, markSupported, read, read, read, reset

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

CountingInputStream

public CountingInputStream(InputStream in)

Constructs a new CountingInputStream.

Parameters:

in - the InputStream to delegate to

Method Detail

skip

public long skip(long length)
          throws IOException

Skips the stream over the specified number of bytes, adding the skipped amount to the count.

Overrides:

skip in class ProxyInputStream

Parameters:

length - the number of bytes to skip

Returns:

the actual number of bytes skipped

Throws:

IOException - if an I/O error occurs

See Also:

InputStream.skip(long)

afterRead

protected void afterRead(int n)

Adds the number of read bytes to the count.

Overrides:

afterRead in class ProxyInputStream

Parameters:

n - number of bytes read, or -1 if no more bytes are available

Since:

2.0

getCount

public int getCount()

The number of bytes that have passed through this stream.

NOTE: From v1.3 this method throws an ArithmeticException if the count is greater than can be expressed by an int. See getByteCount() for a method using a long.

Returns:

the number of bytes accumulated

Throws:

ArithmeticException - if the byte count is too large

resetCount

public int resetCount()

Set the byte count back to 0.

NOTE: From v1.3 this method throws an ArithmeticException if the count is greater than can be expressed by an int. See resetByteCount() for a method using a long.

Returns:

the count previous to resetting

Throws:

ArithmeticException - if the byte count is too large

getByteCount

public long getByteCount()

The number of bytes that have passed through this stream.

NOTE: This method is an alternative for getCount() and was added because that method returns an integer which will result in incorrect count for files over 2GB.

Returns:

the number of bytes accumulated

Since:

1.3

resetByteCount

public long resetByteCount()

Set the byte count back to 0.

NOTE: This method is an alternative for resetCount() and was added because that method returns an integer which will result in incorrect count for files over 2GB.

Returns:

the count previous to resetting

Since:

1.3