Class EntityTemplate

java.lang.Object

org.apache.hc.core5.http.io.entity.AbstractHttpEntity

org.apache.hc.core5.http.io.entity.EntityTemplate

All Implemented Interfaces:

Closeable, AutoCloseable, EntityDetails, HttpEntity

@Contract(threading=IMMUTABLE_CONDITIONAL)
public final class EntityTemplate
extends AbstractHttpEntity

Entity that delegates the process of content generation to a IOCallback with OutputStream as output sink.

This class contains immutable attributes but subclasses may contain additional immutable or mutable attributes.

Since:

4.0

Field Summary

Fields

Modifier and Type	Field	Description
private final IOCallback<OutputStream>	callback
private final long	contentLength

Fields inherited from class AbstractHttpEntity

OUTPUT_BUFFER_SIZE

Constructor Summary

Constructors

Constructor	Description
EntityTemplate(long contentLength, ContentType contentType, String contentEncoding, IOCallback<OutputStream> callback)	Constructs a new instance with the given attributes kept as immutable.
EntityTemplate(long contentLength, ContentType contentType, IOCallback<OutputStream> callback)
EntityTemplate(ContentType contentType, IOCallback<OutputStream> callback)

Method Summary

Modifier and Type	Method	Description
void	close()
InputStream	getContent()	Gets a content stream of the entity.
long	getContentLength()	Gets length of this entity, if known.
boolean	isRepeatable()	Tests if the entity is capable of producing its data more than once.
boolean	isStreaming()	Tests whether this entity depends on an underlying stream.
void	writeTo(OutputStream outStream)	Writes this entity to an OutputStream.

Methods inherited from class AbstractHttpEntity

getContentEncoding, getContentType, getTrailerNames, getTrailers, isChunked, toString, writeTo

Methods inherited from class Object

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

Field Details

contentLength

private final long contentLength

callback

private final IOCallback<OutputStream> callback

Constructor Details

EntityTemplate

public EntityTemplate(long contentLength,
 ContentType contentType,
 String contentEncoding,
 IOCallback<OutputStream> callback)

Constructs a new instance with the given attributes kept as immutable.

The new instance:

• is not chunked.

Parameters:

contentLength - The value for the Content-Length header for the size of the message body, in bytes.

contentType - The content-type, may be null.

contentEncoding - The content encoding string, may be null.

callback - A consumer that write the message body to an output stream.

EntityTemplate

public EntityTemplate(long contentLength,
 ContentType contentType,
 IOCallback<OutputStream> callback)

Since:

5.4

EntityTemplate

public EntityTemplate(ContentType contentType,
 IOCallback<OutputStream> callback)

Since:

5.4

Method Details

getContentLength

public long getContentLength()

Description copied from interface: EntityDetails

Gets length of this entity, if known.

Returns:

the length of this entity, may be 0.

getContent

public InputStream getContent()
                       throws IOException

Description copied from interface: HttpEntity

Gets a content stream of the entity. Repeatable entities are expected to create a new instance of InputStream for each invocation of this method and therefore can be consumed multiple times. Entities that are not repeatable are expected to return the same InputStream instance and therefore may not be consumed more than once.

If this entity belongs to an incoming HTTP message, calling InputStream.close() on the returned InputStream will try to consume the complete entity content to keep the connection alive. In cases where this is undesired, e.g. when only a small part of the content is relevant and consuming the complete entity content would be too inefficient, only the HTTP message from which this entity was obtained should be closed (if supported).

IMPORTANT: Please note all entity implementations must ensure that all allocated resources are properly deallocated after the InputStream.close() method is invoked.

Returns:

content stream of the entity.

Throws:

IOException - if the stream could not be created

See Also:

• HttpEntity.isRepeatable()

isRepeatable

public boolean isRepeatable()

Tests if the entity is capable of producing its data more than once. A repeatable entity's getContent() and writeTo(OutputStream) methods can be called more than once whereas a non-repeatable entity's can not.

This implementation always returns false.

This implementation always returns true.

Specified by:

isRepeatable in interface HttpEntity

Overrides:

isRepeatable in class AbstractHttpEntity

Returns:

true if the entity is repeatable, false otherwise.

writeTo

public void writeTo(OutputStream outStream)
             throws IOException

Description copied from class: AbstractHttpEntity

Writes this entity to an OutputStream.

Specified by:

writeTo in interface HttpEntity

Overrides:

writeTo in class AbstractHttpEntity

Parameters:

outStream - Where to write the entity, never null.

Throws:

IOException - if the entity cannot generate its content stream; also thrown if the output stream is closed.

isStreaming

public boolean isStreaming()

Tests whether this entity depends on an underlying stream. Streamed entities that read data directly from the socket should return true. Self-contained entities should return false. Wrapping entities should delegate this call to the wrapped entity.

This implementation always returns false.

Returns:

true if the entity content is streamed, false otherwise

close

public void close()
           throws IOException

This implementation is a no-op.

Throws:

IOException