org.restlet.representation

Class BufferingRepresentation

java.lang.Object

org.restlet.representation.Variant

org.restlet.representation.RepresentationInfo

org.restlet.representation.Representation

org.restlet.util.WrapperRepresentation

org.restlet.representation.BufferingRepresentation

public class BufferingRepresentation
extends WrapperRepresentation

Representation capable of buffering the wrapped representation. This is useful when you want to prevent chunk encoding from being used for dynamic representations or when you want to reuse a transient representation several times.

Be careful as this class could create potentially very large byte buffers in memory that could impact your application performance.

Author:

Thierry Boileau

Field Summary

Fields inherited from class org.restlet.representation.Representation

UNKNOWN_SIZE

Constructor Summary

Constructors

Constructor and Description
BufferingRepresentation(Representation bufferedRepresentation) Constructor.

Method Summary

Methods

Modifier and Type	Method and Description
long	getAvailableSize() Returns the size effectively available.
protected byte[]	getBuffer() Returns the buffered content as an array of bytes.
ReadableByteChannel	getChannel() Returns a channel with the representation's content. If it is supported by a file, a read-only instance of FileChannel is returned. This method is ensured to return a fresh channel for each invocation unless it is a transient representation, in which case null is returned.
Reader	getReader() Returns a characters reader with the representation's content.
long	getSize() Returns the total size in bytes if known, UNKNOWN_SIZE (-1) otherwise.
InputStream	getStream() Returns a stream with the representation's content.
String	getText() Converts the representation to a string value.
boolean	isAvailable() Indicates if some fresh content is potentially available, without having to actually call one of the content manipulation method like getStream() that would actually consume it.
protected boolean	isBuffered() Indicates if the wrapped entity has been already buffered.
protected void	setBuffer(byte[] buffer) Sets the buffered content as an array of bytes.
protected void	setBuffered(boolean buffered) Indicates if the wrapped entity has been already buffered.
void	write(OutputStream outputStream) Writes the representation to a byte stream.
void	write(WritableByteChannel writableChannel) Writes the representation to a byte channel.
void	write(Writer writer) Writes the representation to a characters writer.

Methods inherited from class org.restlet.util.WrapperRepresentation

exhaust, getCharacterSet, getDigest, getDisposition, getEncodings, getExpirationDate, getLanguages, getLocationRef, getMediaType, getModificationDate, getRange, getRegistration, getTag, getWrappedRepresentation, isSelectable, isTransient, release, setAvailable, setCharacterSet, setDigest, setDisposition, setEncodings, setExpirationDate, setLanguages, setLocationRef, setLocationRef, setMediaType, setModificationDate, setRange, setSize, setTag, setTransient

Methods inherited from class org.restlet.representation.Representation

append, hasKnownSize, isEmpty, setListener

Methods inherited from class org.restlet.representation.Variant

createClientInfo, equals, hashCode, includes, isCompatible, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

BufferingRepresentation

public BufferingRepresentation(Representation bufferedRepresentation)

Constructor.

Parameters:

bufferedRepresentation - The representation to buffer.

Method Detail

getAvailableSize

public long getAvailableSize()

Description copied from class: Representation

Returns the size effectively available. This returns the same value as Representation.getSize() if no range is defined, otherwise it returns the size of the range using Range.getSize().

Overrides:

getAvailableSize in class WrapperRepresentation

Returns:

The available size.

getBuffer

protected byte[] getBuffer()

Returns the buffered content as an array of bytes.

Returns:

The buffered content as an array of bytes.

getChannel

public ReadableByteChannel getChannel()
                               throws IOException

Description copied from class: Representation

Returns a channel with the representation's content.
If it is supported by a file, a read-only instance of FileChannel is returned.
This method is ensured to return a fresh channel for each invocation unless it is a transient representation, in which case null is returned.

Overrides:

getChannel in class WrapperRepresentation

Returns:

A channel with the representation's content.

Throws:

IOException

getReader

public Reader getReader()
                 throws IOException

Description copied from class: Representation

Returns a characters reader with the representation's content. This method is ensured to return a fresh reader for each invocation unless it is a transient representation, in which case null is returned. If the representation has no character set defined, the system's default one will be used.

Overrides:

getReader in class WrapperRepresentation

Returns:

A reader with the representation's content.

Throws:

IOException

getSize

public long getSize()

Description copied from class: Representation

Returns the total size in bytes if known, UNKNOWN_SIZE (-1) otherwise. When ranges are used, this might not be the actual size available. For this purpose, you can use the Representation.getAvailableSize() method.

Note that when used with HTTP connectors, this property maps to the "Content-Length" header.

Overrides:

getSize in class WrapperRepresentation

Returns:

The size in bytes if known, UNKNOWN_SIZE (-1) otherwise.

See Also:

Representation.isEmpty()

getStream

public InputStream getStream()
                      throws IOException

Description copied from class: Representation

Returns a stream with the representation's content. This method is ensured to return a fresh stream for each invocation unless it is a transient representation, in which case null is returned.

Overrides:

getStream in class WrapperRepresentation

Returns:

A stream with the representation's content.

Throws:

IOException

getText

public String getText()
               throws IOException

Description copied from class: Representation

Converts the representation to a string value. Be careful when using this method as the conversion of large content to a string fully stored in memory can result in OutOfMemoryErrors being thrown.

Overrides:

getText in class WrapperRepresentation

Returns:

The representation as a string value.

Throws:

IOException

isAvailable

public boolean isAvailable()

Description copied from class: Representation

Indicates if some fresh content is potentially available, without having to actually call one of the content manipulation method like getStream() that would actually consume it. Note that when the size of a representation is 0 is a not considered available. However, sometimes the size isn't known until a read attempt is made, so availability doesn't guarantee a non empty content.

This is especially useful for transient representation whose content can only be accessed once and also when the size of the representation is not known in advance.

Overrides:

isAvailable in class WrapperRepresentation

Returns:

True if some fresh content is available.

isBuffered

protected boolean isBuffered()

Indicates if the wrapped entity has been already buffered.

Returns:

True if the wrapped entity has been already buffered.

setBuffer

protected void setBuffer(byte[] buffer)

Sets the buffered content as an array of bytes.

Parameters:

buffer - The buffered content as an array of bytes.

setBuffered

protected void setBuffered(boolean buffered)

Indicates if the wrapped entity has been already buffered.

Parameters:

buffered - True if the wrapped entity has been already buffered.

write

public void write(OutputStream outputStream)
           throws IOException

Description copied from class: Representation

Writes the representation to a byte stream. This method is ensured to write the full content for each invocation unless it is a transient representation, in which case an exception is thrown.

Note that the class implementing this method shouldn't flush or close the given OutputStream after writing to it as this will be handled by the Restlet connectors automatically.

Overrides:

write in class WrapperRepresentation

Parameters:

outputStream - The output stream.

Throws:

IOException

write

public void write(WritableByteChannel writableChannel)
           throws IOException

Description copied from class: Representation

Writes the representation to a byte channel. This method is ensured to write the full content for each invocation unless it is a transient representation, in which case an exception is thrown.

Overrides:

write in class WrapperRepresentation

Parameters:

writableChannel - A writable byte channel.

Throws:

IOException

write

public void write(Writer writer)
           throws IOException

Description copied from class: Representation

Writes the representation to a characters writer. This method is ensured to write the full content for each invocation unless it is a transient representation, in which case an exception is thrown.

Note that the class implementing this method shouldn't flush or close the given Writer after writing to it as this will be handled by the Restlet connectors automatically.

Overrides:

write in class WrapperRepresentation

Parameters:

writer - The characters writer.

Throws:

IOException