Package org.apache.hc.core5.http.nio.entity

Class DigestingEntityProducer

java.lang.Object

org.apache.hc.core5.http.nio.entity.DigestingEntityProducer

All Implemented Interfaces:

EntityDetails, AsyncDataProducer, AsyncEntityProducer, ResourceHolder

public class DigestingEntityProducer
extends java.lang.Object
implements AsyncEntityProducer

AsyncEntityProducer decorator that calculates a digest hash from the data stream content and appends its value to the list of trailers.

Since:

5.0

Field Summary

Fields

Modifier and Type	Field	Description
private byte[]	digest
private java.security.MessageDigest	digester
private AsyncEntityProducer	wrapped

Constructor Summary

Constructors

Constructor	Description
DigestingEntityProducer(java.lang.String algo, AsyncEntityProducer wrapped)

Method Summary

Modifier and Type	Method	Description
int	available()	Returns the number of bytes immediately available for output.
void	failed(java.lang.Exception cause)	Triggered to signal a failure in data generation.
java.lang.String	getContentEncoding()	Gets content encoding of this entity, if known.
long	getContentLength()	Gets length of this entity, if known.
java.lang.String	getContentType()	Gets content type of this entity, if known.
byte[]	getDigest()	Returns digest hash.
java.util.Set<java.lang.String>	getTrailerNames()	Gets the preliminary declaration of trailing headers.
boolean	isChunked()	Tests the chunked transfer hint for this entity.
boolean	isRepeatable()	Determines whether the producer can consistently produce the same content after invocation of ResourceHolder.releaseResources().
void	produce(DataStreamChannel channel)	Triggered to signal the ability of the underlying data channel to accept more data.
void	releaseResources()

Methods inherited from class java.lang.Object

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

Field Detail

wrapped

private final AsyncEntityProducer wrapped

digester

private final java.security.MessageDigest digester

digest

private volatile byte[] digest

Constructor Detail

DigestingEntityProducer

public DigestingEntityProducer(java.lang.String algo,
                               AsyncEntityProducer wrapped)

Method Detail

isRepeatable

public boolean isRepeatable()

Description copied from interface: AsyncEntityProducer

Determines whether the producer can consistently produce the same content after invocation of ResourceHolder.releaseResources().

Specified by:

isRepeatable in interface AsyncEntityProducer

getContentLength

public long getContentLength()

Description copied from interface: EntityDetails

Gets length of this entity, if known.

Specified by:

getContentLength in interface EntityDetails

Returns:

the length of this entity, may be 0.

getContentType

public java.lang.String getContentType()

Description copied from interface: EntityDetails

Gets content type of this entity, if known.

Specified by:

getContentType in interface EntityDetails

Returns:

the content type of this entity, may be null.

getContentEncoding

public java.lang.String getContentEncoding()

Description copied from interface: EntityDetails

Gets content encoding of this entity, if known.

Specified by:

getContentEncoding in interface EntityDetails

Returns:

the content encoding of this entity, may be null.

isChunked

public boolean isChunked()

Description copied from interface: EntityDetails

Tests the chunked transfer hint for this entity.

The behavior of wrapping entities is implementation dependent, but should respect the primary purpose.

Specified by:

isChunked in interface EntityDetails

Returns:

the chunked transfer hint for this entity.

getTrailerNames

public java.util.Set<java.lang.String> getTrailerNames()

Description copied from interface: EntityDetails

Gets the preliminary declaration of trailing headers.

Specified by:

getTrailerNames in interface EntityDetails

Returns:

the preliminary declaration of trailing headers.

available

public int available()

Description copied from interface: AsyncDataProducer

Returns the number of bytes immediately available for output. This method can be used as a hint to control output events of the underlying I/O session.

Please note this method should return zero if the data producer is unable to produce any more data, in which case AsyncDataProducer.produce(DataStreamChannel) method will not get triggered. The producer can resume writing out data asynchronously once more data becomes available or request output readiness events with DataStreamChannel.requestOutput().

Specified by:

available in interface AsyncDataProducer

Returns:

the number of bytes immediately available for output

See Also:

AsyncDataProducer.produce(DataStreamChannel), DataStreamChannel.requestOutput()

produce

public void produce(DataStreamChannel channel)
             throws java.io.IOException

Description copied from interface: AsyncDataProducer

Triggered to signal the ability of the underlying data channel to accept more data. The data producer can choose to write data immediately inside the call or asynchronously at some later point.

Please note this method gets triggered only if AsyncDataProducer.available() returns a positive value.

Specified by:

produce in interface AsyncDataProducer

Parameters:

channel - the data channel capable of accepting more data.

Throws:

java.io.IOException - in case of an I/O error.

See Also:

AsyncDataProducer.available()

failed

public void failed(java.lang.Exception cause)

Description copied from interface: AsyncEntityProducer

Triggered to signal a failure in data generation.

Specified by:

failed in interface AsyncEntityProducer

Parameters:

cause - the cause of the failure.

releaseResources

public void releaseResources()

Specified by:

releaseResources in interface ResourceHolder

getDigest

public byte[] getDigest()

Returns digest hash.

Returns:

the digest hash value.