HashingOutputStream

com.google.common.hash

Class HashingOutputStream

java.lang.Object
- java.io.OutputStream
- - java.io.FilterOutputStream
  - - com.google.common.hash.HashingOutputStream

All Implemented Interfaces:

Closeable, Flushable, AutoCloseable
```
@Beta
public final class HashingOutputStream
extends FilterOutputStream
```
An OutputStream that maintains a hash of the data written to it.

Since:

16.0

Field Summary
- Fields inherited from class java.io.FilterOutputStream
  out

Constructor Summary

Constructors

Constructor and Description
`HashingOutputStream(HashFunction hashFunction, OutputStream out)` Creates an output stream that hashes using the given `HashFunction`, and forwards all data written to it to the underlying `OutputStream`.

Method Summary

All Methods

Instance Methods

Concrete Methods
Modifier and Type	Method and Description
`void`	`close()`
`HashCode`	`hash()` Returns the `HashCode` based on the data written to this stream.
`void`	`write(byte[] bytes, int off, int len)`
`void`	`write(int b)`

Methods inherited from class java.io.FilterOutputStream
flush, write

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - HashingOutputStream
```
public HashingOutputStream(HashFunction hashFunction,
                           OutputStream out)
```
    Creates an output stream that hashes using the given HashFunction, and forwards all data written to it to the underlying OutputStream.
    The OutputStream should not be written to before or after the hand-off.
- Method Detail
  - write
```
public void write(int b)
           throws IOException
```
    Overrides:
    
    write in class FilterOutputStream
    
    Throws:
    
    IOException
  - write
```
public void write(byte[] bytes,
                  int off,
                  int len)
           throws IOException
```
    Overrides:
    
    write in class FilterOutputStream
    
    Throws:
    
    IOException
  - hash
```
public HashCode hash()
```
    Returns the HashCode based on the data written to this stream. The result is unspecified if this method is called more than once on the same instance.
  - close
```
public void close()
           throws IOException
```
    Specified by:
    
    close in interface Closeable
    
    Specified by:
    
    close in interface AutoCloseable
    
    Overrides:
    
    close in class FilterOutputStream
    
    Throws:
    
    IOException