org.restlet.resource
Class FileRepresentation

java.lang.Object
  org.restlet.resource.Variant
      org.restlet.resource.Representation
          org.restlet.resource.FileRepresentation

public class FileRepresentation
extends Representation

Representation based on a file.

Author:

Jerome Louvel

Field Summary

Fields inherited from class org.restlet.resource.Representation

UNKNOWN_SIZE

Constructor Summary

FileRepresentation(File file, MediaType mediaType)
Constructor that does not set an expiration date for file

FileRepresentation(File file, MediaType mediaType, int timeToLive)
Constructor.

FileRepresentation(String path, MediaType mediaType)
Constructor that does not set an expiration date for path

FileRepresentation(String path, MediaType mediaType, int timeToLive)
Constructor.

Method Summary

FileChannel	getChannel() Returns a readable byte channel.
File	getFile() Returns the file handle.
Reader	getReader() Returns a characters reader with the representation's content.
long	getSize() Returns the size in bytes if known, UNKNOWN_SIZE (-1) otherwise.
FileInputStream	getStream() Returns a stream with the representation's content.
String	getText() Converts the representation to a string value.
void	release() Releases the file handle.
void	setFile(File file) Sets the file handle.
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.resource.Representation

checkDigest, checkDigest, computeDigest, createEmpty, exhaust, getAvailableSize, getDigest, getDownloadName, getExpirationDate, getModificationDate, getRange, getTag, isAvailable, isDownloadable, isTransient, setAvailable, setDigest, setDownloadable, setDownloadName, setExpirationDate, setModificationDate, setRange, setSize, setTag, setTransient

Methods inherited from class org.restlet.resource.Variant

getCharacterSet, getEncodings, getIdentifier, getLanguages, getMediaType, setCharacterSet, setEncodings, setIdentifier, setIdentifier, setLanguages, setMediaType

Methods inherited from class java.lang.Object

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

Constructor Detail

FileRepresentation

public FileRepresentation(File file,
                          MediaType mediaType)

Constructor that does not set an expiration date for file

Parameters:

file - The represented file.

mediaType - The representation's media type.

See Also:

FileRepresentation(File, MediaType, int)

FileRepresentation

public FileRepresentation(File file,
                          MediaType mediaType,
                          int timeToLive)

Constructor. If a positive "timeToLive" parameter is given, then the expiration date is set accordingly. If "timeToLive" is equal to zero, then the expiration date is set to the current date, meaning that it will immediately expire on the client. If -1 is given, then no expiration date is set.

Parameters:

file - The represented file.

mediaType - The representation's media type.

timeToLive - The time to live before it expires (in seconds).

FileRepresentation

public FileRepresentation(String path,
                          MediaType mediaType)

Constructor that does not set an expiration date for path

Parameters:

path - The path name or file URI of the represented file (either in system format or in 'file:///' format).

mediaType - The representation's media type.

See Also:

FileRepresentation(String, MediaType, int)

FileRepresentation

public FileRepresentation(String path,
                          MediaType mediaType,
                          int timeToLive)

Constructor.

Parameters:

path - The path name or file URI of the represented file (either in system format or in 'file:///' format).

mediaType - The representation's media type.

timeToLive - The time to live before it expires (in seconds).

See Also:

File.File(String)

Method Detail

getChannel

public FileChannel getChannel()
                       throws IOException

Returns a readable byte channel. If it is supported by a file a read-only instance of FileChannel is returned.

Specified by:

getChannel in class Representation

Returns:

A readable byte channel.

Throws:

IOException

getFile

public File getFile()

Returns the file handle.

Returns:

the file handle.

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.

Specified by:

getReader in class Representation

Returns:

A reader with the representation's content.

Throws:

IOException

getSize

public long getSize()

Description copied from class: Representation

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

Overrides:

getSize in class Representation

Returns:

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

getStream

public FileInputStream 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.

Specified by:

getStream in class Representation

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 Representation

Returns:

The representation as a string value.

Throws:

IOException

release

public void release()

Releases the file handle.

Overrides:

release in class Representation

setFile

public void setFile(File file)

Sets the file handle.

Parameters:

file - The file handle.

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.

Specified by:

write in class Representation

Parameters:

outputStream - The output stream.

Throws:

IOException

write

public void write(WritableByteChannel writableChannel)
           throws IOException

Writes the representation to a byte channel. Optimizes using the file channel transferTo method.

Specified by:

write in class Representation

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.

Specified by:

write in class Representation

Parameters:

writer - The characters writer.

Throws:

IOException