Package com.scurrilous.circe.crc

Class StandardCrcProvider

java.lang.Object

com.scurrilous.circe.impl.AbstractHashProvider<CrcParameters>

com.scurrilous.circe.crc.StandardCrcProvider

All Implemented Interfaces:

HashProvider

public final class StandardCrcProvider
extends AbstractHashProvider<CrcParameters>

Provides pure Java and JDK-supplied CRC implementations.

Constructor Summary

Constructors

Constructor	Description
StandardCrcProvider()	Constructs a new StandardCrcProvider.

Method Summary

Modifier and Type	Method	Description
protected StatelessHash	createCacheable(CrcParameters params, java.util.EnumSet<HashSupport> required)	Called by AbstractHashProvider.getCacheable(P, java.util.EnumSet<com.scurrilous.circe.HashSupport>) to create new cacheable stateless hash functions.
protected Hash	get(CrcParameters params, java.util.EnumSet<HashSupport> required)	Requests a hash function using the given parameters and support flags.
protected java.util.EnumSet<HashSupport>	querySupportTyped(CrcParameters params)	Implemented by subclasses to provide information about the available implementations corresponding to the given hash algorithm parameters.

Methods inherited from class com.scurrilous.circe.impl.AbstractHashProvider

createStateful, getCacheable, getIncrementalInt, getIncrementalLong, getStatelessInt, getStatelessLong, querySupport

Methods inherited from class java.lang.Object

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

Constructor Detail

StandardCrcProvider

public StandardCrcProvider()

Constructs a new StandardCrcProvider.

Method Detail

querySupportTyped

protected java.util.EnumSet<HashSupport> querySupportTyped(CrcParameters params)

Description copied from class: AbstractHashProvider

Implemented by subclasses to provide information about the available implementations corresponding to the given hash algorithm parameters. Called by AbstractHashProvider.querySupport(com.scurrilous.circe.HashParameters) if the hash parameters match the base type supported by this provider.

Specified by:

querySupportTyped in class AbstractHashProvider<CrcParameters>

Parameters:

params - the hash algorithm parameters

Returns:

a set of flags indicating the level of support

get

protected Hash get(CrcParameters params,
                   java.util.EnumSet<HashSupport> required)

Description copied from class: AbstractHashProvider

Requests a hash function using the given parameters and support flags. This method is only responsible for checking support flags returned by AbstractHashProvider.querySupportTyped(P).

To support caching of stateless hash functions, call AbstractHashProvider.getCacheable(P, java.util.EnumSet<com.scurrilous.circe.HashSupport>) from this method and implement AbstractHashProvider.createCacheable(P, java.util.EnumSet<com.scurrilous.circe.HashSupport>).

Specified by:

get in class AbstractHashProvider<CrcParameters>

Parameters:

params - the hash algorithm parameters

required - the required hash support flags

Returns:

a hash function

createCacheable

protected StatelessHash createCacheable(CrcParameters params,
                                        java.util.EnumSet<HashSupport> required)

Description copied from class: AbstractHashProvider

Called by AbstractHashProvider.getCacheable(P, java.util.EnumSet<com.scurrilous.circe.HashSupport>) to create new cacheable stateless hash functions. The default implementation simply throws UnsupportedOperationException.

Overrides:

createCacheable in class AbstractHashProvider<CrcParameters>

Parameters:

params - the hash algorithm parameters

required - the required hash support flags

Returns:

a stateless hash function