org.apache.http.entity
Class HttpEntityWrapper

java.lang.Object
  org.apache.http.entity.HttpEntityWrapper

All Implemented Interfaces:

HttpEntity

Direct Known Subclasses:

BufferedHttpEntity

public class HttpEntityWrapper

extends java.lang.Object

implements HttpEntity

Base class for wrapping entities. Keeps a wrappedEntity and delegates all calls to it. Implementations of wrapping entities can derive from this class and need to override only those methods that should not be delegated to the wrapped entity.

Since:

4.0

Version:

$Revision: 496070 $

Field Summary

protected HttpEntity

wrappedEntity The wrapped entity.

Constructor Summary

HttpEntityWrapper(HttpEntity wrapped)
Creates a new entity wrapper.

Method Summary

void	consumeContent() Consumes the remaining content of a streamed entity.
java.io.InputStream	getContent() Creates a new InputStream object of the entity.
Header	getContentEncoding() Obtains the Content-Encoding header, if known.
long	getContentLength() Tells the length of the content, if known.
Header	getContentType() Obtains the Content-Type header, if known.
boolean	isChunked() Tells about chunked encoding for this entity.
boolean	isRepeatable() Tells if the entity is capable to produce its data more than once.
boolean	isStreaming() Tells whether this entity depends on an underlying stream.
void	writeTo(java.io.OutputStream outstream) Writes the entity content to the output stream.

Methods inherited from class java.lang.Object

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

Field Detail

wrappedEntity

protected HttpEntity wrappedEntity

The wrapped entity.

Constructor Detail

HttpEntityWrapper

public HttpEntityWrapper(HttpEntity wrapped)

Creates a new entity wrapper.

Parameters:

wrapped - the entity to wrap

Method Detail

isRepeatable

public boolean isRepeatable()

Description copied from interface: HttpEntity

Tells if the entity is capable to produce 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.

Specified by:

isRepeatable in interface HttpEntity

Returns:

true if the entity is repeatable, false otherwise.

isChunked

public boolean isChunked()

Description copied from interface: HttpEntity

Tells about chunked encoding for this entity. The primary purpose of this method is to indicate whether chunked encoding should be used when the entity is sent. For entities that are received, it can also indicate whether the entity was received with chunked encoding.
The behavior of wrapping entities is implementation dependent, but should respect the primary purpose.

Specified by:

isChunked in interface HttpEntity

Returns:

true if chunked encoding is preferred for this entity, or false if it is not

getContentLength

public long getContentLength()

Description copied from interface: HttpEntity

Tells the length of the content, if known.

Specified by:

getContentLength in interface HttpEntity

Returns:

the number of bytes of the content, or a negative number if unknown. If the content length is known but exceeds Long.MAX_VALUE, a negative number is returned.

getContentType

public Header getContentType()

Description copied from interface: HttpEntity

Obtains the Content-Type header, if known. This is the header that should be used when sending the entity, or the one that was received with the entity. It can include a charset attribute.

Specified by:

getContentType in interface HttpEntity

Returns:

the Content-Type header for this entity, or null if the content type is unknown

getContentEncoding

public Header getContentEncoding()

Description copied from interface: HttpEntity

Obtains the Content-Encoding header, if known. This is the header that should be used when sending the entity, or the one that was received with the entity. Wrapping entities that modify the content encoding should adjust this header accordingly.

Specified by:

getContentEncoding in interface HttpEntity

Returns:

the Content-Encoding header for this entity, or null if the content encoding is unknown

getContent

public java.io.InputStream getContent()
                               throws java.io.IOException

Description copied from interface: HttpEntity

Creates a new InputStream object of the entity. It is a programming error to return the same InputStream object more than once. Entities that are not repeatable will throw an exception if this method is called multiple times.

Specified by:

getContent in interface HttpEntity

Returns:

a new input stream that returns the entity data.

Throws:

java.io.IOException - if the stream could not be created

writeTo

public void writeTo(java.io.OutputStream outstream)
             throws java.io.IOException

Description copied from interface: HttpEntity

Writes the entity content to the output stream.

Specified by:

writeTo in interface HttpEntity

Parameters:

outstream - the output stream to write entity content to

Throws:

java.io.IOException - if an I/O error occurs

isStreaming

public boolean isStreaming()

Description copied from interface: HttpEntity

Tells whether this entity depends on an underlying stream. Streamed entities should return true until the content has been consumed, false afterwards. Self-contained entities should return false. Wrapping entities should delegate this call to the wrapped entity.
The content of a streamed entity is consumed when the stream returned by getContent has been read to EOF, or after consumeContent has been called. If a streamed entity can not detect whether the stream has been read to EOF, it should return true until consumeContent is called.

Specified by:

isStreaming in interface HttpEntity

Returns:

true if the entity content is streamed and not yet consumed, false otherwise

consumeContent

public void consumeContent()
                    throws java.io.IOException

Description copied from interface: HttpEntity

Consumes the remaining content of a streamed entity. This method is called to indicate that the content of this entity is no longer required. Streamed entities should dispose of the remaining content, if any. Self-contained entities can release allocated resources, but are not required to do anything. Wrapping entities should delegate this call to the wrapped entity.
This method is of particular importance for entities being received from a connection. The entity needs to be consumed completely in order to re-use the connection with keep-alive.

Specified by:

consumeContent in interface HttpEntity

Throws:

java.io.IOException - if an I/O error occurs. This indicates that connection keep-alive is not possible.