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:

java.io.Closeable, java.lang.AutoCloseable

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.

Constructor Summary

Constructors

Constructor and Description
CountingInputStream(java.io.InputStream in) Constructs a new CountingInputStream.

Method Summary

Modifier and Type	Method and Description
long	getByteCount() Gets number of bytes that have passed through this stream.
int	getCount() Gets number of bytes that have passed through this stream.
long	resetByteCount() Resets the byte count back to 0.
int	resetCount() Resets 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, close, mark, markSupported, read, read, read, reset

Methods inherited from class java.lang.Object

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

Constructor Detail

CountingInputStream

public CountingInputStream(java.io.InputStream in)

Constructs a new CountingInputStream.

Parameters:

in - the InputStream to delegate to

Method Detail

getByteCount

public long getByteCount()

Gets 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

getCount

public int getCount()

Gets 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:

java.lang.ArithmeticException - if the byte count is too large

resetByteCount

public long resetByteCount()

Resets 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

resetCount

public int resetCount()

Resets 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:

java.lang.ArithmeticException - if the byte count is too large

skip

public long skip(long length)
          throws java.io.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:

java.io.IOException - if an I/O error occurs.

See Also:

InputStream.skip(long)