Package org.apache.commons.io.input

Class MessageDigestCalculatingInputStream.MessageDigestMaintainingObserver

java.lang.Object

org.apache.commons.io.input.ObservableInputStream.Observer

org.apache.commons.io.input.MessageDigestCalculatingInputStream.MessageDigestMaintainingObserver

Enclosing class:

MessageDigestCalculatingInputStream

public static class MessageDigestCalculatingInputStream.MessageDigestMaintainingObserver
extends ObservableInputStream.Observer

Maintains the message digest.

Constructor Summary

Constructors

Constructor	Description
MessageDigestMaintainingObserver(MessageDigest messageDigest)	Constructs an MessageDigestMaintainingObserver for the given MessageDigest.

Method Summary

Modifier and Type	Method	Description
void	data(byte[] input, int offset, int length)	Called to indicate that InputStream.read(byte[]), or InputStream.read(byte[], int, int) have been called, and are about to invoke data.
void	data(int input)	Called to indicate, that InputStream.read() has been invoked on the ObservableInputStream, and will return a value.

Methods inherited from class org.apache.commons.io.input.ObservableInputStream.Observer

closed, error, finished

Methods inherited from class java.lang.Object

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

Constructor Details

MessageDigestMaintainingObserver

public MessageDigestMaintainingObserver(MessageDigest messageDigest)

Constructs an MessageDigestMaintainingObserver for the given MessageDigest.

Parameters:

messageDigest - the message digest to use

Throws:

NullPointerException - if messageDigest is null.

Method Details

data

public void data(byte[] input,
 int offset,
 int length)
          throws IOException

Description copied from class: ObservableInputStream.Observer

Called to indicate that InputStream.read(byte[]), or InputStream.read(byte[], int, int) have been called, and are about to invoke data.

Overrides:

data in class ObservableInputStream.Observer

Parameters:

input - The byte array, which has been passed to the read call, and where data has been stored.

offset - The offset within the byte array, where data has been stored.

length - The number of bytes, which have been stored in the byte array.

Throws:

IOException - if an I/O error occurs.

data

public void data(int input)
          throws IOException

Description copied from class: ObservableInputStream.Observer

Called to indicate, that InputStream.read() has been invoked on the ObservableInputStream, and will return a value.

Overrides:

data in class ObservableInputStream.Observer

Parameters:

input - The value, which is being returned. This will never be -1 (EOF), because, in that case, ObservableInputStream.Observer.finished() will be invoked instead.

Throws:

IOException - if an I/O error occurs.