AbstractCompositeHashFunction

java.lang.Object
- com.google.common.hash.AbstractStreamingHashFunction
- - com.google.common.hash.AbstractCompositeHashFunction

All Implemented Interfaces:

HashFunction

Direct Known Subclasses:

Hashing.ConcatenatedHashFunction
```
abstract class AbstractCompositeHashFunction
extends AbstractStreamingHashFunction
```
An abstract composition of multiple hash functions. newHasher() delegates to the Hasher objects of the delegate hash functions, and in the end, they are used by makeHash(Hasher[]) that constructs the final HashCode.

Nested Class Summary
- Nested classes/interfaces inherited from class com.google.common.hash.AbstractStreamingHashFunction
  AbstractStreamingHashFunction.AbstractStreamingHasher

Field Summary

Fields
Modifier and Type Field Description

(package private) HashFunction[] functions

private static long serialVersionUID

Constructor Summary

Constructors
Constructor Description

AbstractCompositeHashFunction(HashFunction... functions)

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	Description
`(package private) abstract HashCode`	`makeHash(Hasher[] hashers)`	Constructs a `HashCode` from the `Hasher` objects of the functions.
`Hasher`	`newHasher()`	Begins a new hash code computation by returning an initialized, stateful `Hasher` instance that is ready to receive data.

Methods inherited from class com.google.common.hash.AbstractStreamingHashFunction
hashBytes, hashBytes, hashInt, hashLong, hashObject, hashString, hashUnencodedChars, newHasher

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

Methods inherited from interface com.google.common.hash.HashFunction
bits

- Field Detail
  - functions
```
final HashFunction[] functions
```
  - serialVersionUID
```
private static final long serialVersionUID
```
    See Also:
    
    Constant Field Values
- Constructor Detail
  - AbstractCompositeHashFunction
```
AbstractCompositeHashFunction(HashFunction... functions)
```
- Method Detail
  - makeHash
```
abstract HashCode makeHash(Hasher[] hashers)
```
    Constructs a HashCode from the Hasher objects of the functions. Each of them has consumed the entire input and they are ready to output a HashCode. The order of the hashers are the same order as the functions given to the constructor.
  - newHasher
```
public Hasher newHasher()
```
    Description copied from interface: HashFunction
    Begins a new hash code computation by returning an initialized, stateful Hasher instance that is ready to receive data. Example:
    HashFunction hf = Hashing.md5(); HashCode hc = hf.newHasher() .putLong(id) .putBoolean(isActive) .hash();