org.restlet.engine.io
Class IoUtils

java.lang.Object
  org.restlet.engine.io.IoUtils

public class IoUtils
extends Object

IO manipulation utilities.

Author:

Thierry Boileau

Field Summary

static int	BUFFER_SIZE The size to use when instantiating buffered items such as instances of the BufferedReader class.
static int	TIMEOUT_MS The number of milliseconds after which IO operation will time out.

Method Summary

static void	copy(InputStream inputStream, OutputStream outputStream) Copies an input stream to an output stream.
static void	copy(InputStream inputStream, RandomAccessFile randomAccessFile) Copies an input stream to a random access file.
static void	copy(ReadableByteChannel readableChannel, WritableByteChannel writableChannel) Writes a readable channel to a writable channel.
static void	copy(Reader reader, Writer writer) Copies characters from a reader to a writer.
static boolean	delete(File file) Deletes an individual file or an empty directory.
static boolean	delete(File file, boolean recursive) Deletes an individual file or a directory.
static boolean	delete(File file, boolean recursive, boolean garbageCollect) Deletes an individual file or a directory.
static long	exhaust(InputStream input) Exhaust the content of the representation by reading it and silently discarding anything read.
static long	getAvailableSize(Representation representation) Returns the size effectively available.
static ReadableByteChannel	getChannel(InputStream inputStream) Returns a readable byte channel based on a given input stream.
static WritableByteChannel	getChannel(OutputStream outputStream) Returns a writable byte channel based on a given output stream.
static ReadableByteChannel	getChannel(Representation representation) Returns a readable byte channel based on the given representation's content and its write(WritableByteChannel) method.
static Reader	getReader(InputStream stream, CharacterSet characterSet) Returns a reader from an input stream and a character set.
static Reader	getReader(WriterRepresentation representation) Returns a reader from a writer representation.Internally, it uses a writer thread and a pipe stream.
static InputStream	getStream(ReadableByteChannel readableChannel) Returns an input stream based on a given readable byte channel.
static InputStream	getStream(Reader reader, CharacterSet characterSet) Returns an input stream based on a given character reader.
static InputStream	getStream(Representation representation) Returns an input stream based on the given representation's content and its write(OutputStream) method.
static OutputStream	getStream(WritableByteChannel writableChannel) Returns an output stream based on a given writable byte channel.
static OutputStream	getStream(Writer writer, CharacterSet characterSet) Returns an output stream based on a given writer.
static String	getText(Representation representation) Converts the representation to a string value.
static Writer	getWriter(OutputStream outputStream, CharacterSet characterSet) Returns a writer to the given output stream, using the given character set for encoding to bytes.
static boolean	isBlocking(Channel channel) Indicates if the channel is in blocking mode.
static void	release(Selector selector, SelectionKey selectionKey) Release the selection key, working around for bug #6403933.
static byte[]	toByteArray(char[] chars) Converts a char array into a byte array using the default character set.
static byte[]	toByteArray(char[] chars, String charsetName) Converts a char array into a byte array using the provided character set.
static char[]	toCharArray(byte[] bytes) Converts a byte array into a character array using the default character set.
static char[]	toCharArray(byte[] bytes, String charsetName) Converts a byte array into a character array using the default character set.
static String	toHexString(byte[] byteArray) Converts a byte array into an hexadecimal string.
static String	toString(InputStream inputStream) Converts an input stream to a string. As this method uses the InputstreamReader class, the default character set is used for decoding the input stream.
static String	toString(InputStream inputStream, CharacterSet characterSet) Converts an input stream to a string using the specified character set for decoding the input stream.
static String	toString(Reader reader) Converts a reader to a string.

Methods inherited from class java.lang.Object

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

Field Detail

BUFFER_SIZE

public static final int BUFFER_SIZE

The size to use when instantiating buffered items such as instances of the BufferedReader class. It looks for the System property "org.restlet.engine.io.bufferSize" and if not defined, uses the "8192" default value.

TIMEOUT_MS

public static final int TIMEOUT_MS

The number of milliseconds after which IO operation will time out. It looks for the System property "org.restlet.engine.io.timeoutMs" and if not defined, uses the "60000" default value.

Method Detail

copy

public static void copy(InputStream inputStream,
                        OutputStream outputStream)
                 throws IOException

Copies an input stream to an output stream. When the reading is done, the input stream is closed.

Parameters:

inputStream - The input stream.

outputStream - The output stream.

Throws:

IOException

copy

public static void copy(InputStream inputStream,
                        RandomAccessFile randomAccessFile)
                 throws IOException

Copies an input stream to a random access file. When the reading is done, the input stream is closed.

Parameters:

inputStream - The input stream.

randomAccessFile - The random access file.

Throws:

IOException

copy

public static void copy(ReadableByteChannel readableChannel,
                        WritableByteChannel writableChannel)
                 throws IOException

Writes a readable channel to a writable channel.

Parameters:

readableChannel - The readable channel.

writableChannel - The writable channel.

Throws:

IOException

copy

public static void copy(Reader reader,
                        Writer writer)
                 throws IOException

Copies characters from a reader to a writer. When the reading is done, the reader is closed.

Parameters:

reader - The reader.

writer - The writer.

Throws:

IOException

delete

public static boolean delete(File file)

Deletes an individual file or an empty directory.

Parameters:

file - The individual file or directory to delete.

Returns:

True if the deletion was successful.

delete

public static boolean delete(File file,
                             boolean recursive)

Deletes an individual file or a directory. A recursive deletion can be forced as well. Under Windows operating systems, the garbage collector will be invoked once before attempting to delete in order to prevent locking issues.

Parameters:

file - The individual file or directory to delete.

recursive - Indicates if directory with content should be deleted recursively as well.

Returns:

True if the deletion was successful or if the file or directory didn't exist.

delete

public static boolean delete(File file,
                             boolean recursive,
                             boolean garbageCollect)

Deletes an individual file or a directory. A recursive deletion can be forced as well. The garbage collector can be run once before attempting to delete, to workaround lock issues under Windows operating systems.

Parameters:

file - The individual file or directory to delete.

recursive - Indicates if directory with content should be deleted recursively as well.

garbageCollect - Indicates if the garbage collector should be run.

Returns:

True if the deletion was successful or if the file or directory didn't exist.

exhaust

public static long exhaust(InputStream input)
                    throws IOException

Exhaust the content of the representation by reading it and silently discarding anything read.

Parameters:

input - The input stream to exhaust.

Returns:

The number of bytes consumed or -1 if unknown.

Throws:

IOException

getAvailableSize

public static long getAvailableSize(Representation 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().

Parameters:

representation - The representation to evaluate.

Returns:

The available size.

getChannel

public static ReadableByteChannel getChannel(InputStream inputStream)
                                      throws IOException

Returns a readable byte channel based on a given input stream. If it is supported by a file a read-only instance of FileChannel is returned.

Parameters:

inputStream - The input stream to convert.

Returns:

A readable byte channel.

Throws:

IOException

getChannel

public static WritableByteChannel getChannel(OutputStream outputStream)

Returns a writable byte channel based on a given output stream.

Parameters:

outputStream - The output stream.

Returns:

A writable byte channel.

getChannel

public static ReadableByteChannel getChannel(Representation representation)
                                      throws IOException

Returns a readable byte channel based on the given representation's content and its write(WritableByteChannel) method. Internally, it uses a writer thread and a pipe channel.

Parameters:

representation - the representation to get the OutputStream from.

Returns:

A readable byte channel.

Throws:

IOException

getReader

public static Reader getReader(InputStream stream,
                               CharacterSet characterSet)
                        throws UnsupportedEncodingException

Returns a reader from an input stream and a character set.

Parameters:

stream - The input stream.

characterSet - The character set. May be null.

Returns:

The equivalent reader.

Throws:

UnsupportedEncodingException - if a character set is given, but not supported

getReader

public static Reader getReader(WriterRepresentation representation)
                        throws IOException

Returns a reader from a writer representation.Internally, it uses a writer thread and a pipe stream.

Parameters:

representation - The representation to read from.

Returns:

The character reader.

Throws:

IOException

getStream

public static OutputStream getStream(Writer writer,
                                     CharacterSet characterSet)

Returns an output stream based on a given writer.

Parameters:

writer - The writer.

characterSet - The character set used to write on the output stream.

Returns:

the output stream of the writer

getStream

public static InputStream getStream(ReadableByteChannel readableChannel)

Returns an input stream based on a given readable byte channel.

Parameters:

readableChannel - The readable byte channel.

Returns:

An input stream based on a given readable byte channel.

getStream

public static InputStream getStream(Reader reader,
                                    CharacterSet characterSet)

Returns an input stream based on a given character reader.

Parameters:

reader - The character reader.

characterSet - The stream character set.

Returns:

An input stream based on a given character reader.

getStream

public static InputStream getStream(Representation representation)

Returns an input stream based on the given representation's content and its write(OutputStream) method. Internally, it uses a writer thread and a pipe stream.

Parameters:

representation - the representation to get the OutputStream from.

Returns:

A stream with the representation's content.

getStream

public static OutputStream getStream(WritableByteChannel writableChannel)

Returns an output stream based on a given writable byte channel.

Parameters:

writableChannel - The writable byte channel.

Returns:

An output stream based on a given writable byte channel.

getText

public static String getText(Representation representation)
                      throws IOException

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.

Parameters:

representation - The representation to convert.

Returns:

The representation as a string value.

Throws:

IOException

getWriter

public static Writer getWriter(OutputStream outputStream,
                               CharacterSet characterSet)

Returns a writer to the given output stream, using the given character set for encoding to bytes.

Parameters:

outputStream - The target output stream.

characterSet - The character set for encoding.

Returns:

The wrapping writer.

isBlocking

public static boolean isBlocking(Channel channel)

Indicates if the channel is in blocking mode. It returns false when the channel is selectable and configured to be non blocking.

Parameters:

channel - The channel to test.

Returns:

True if the channel is in blocking mode.

release

public static void release(Selector selector,
                           SelectionKey selectionKey)
                    throws IOException

Release the selection key, working around for bug #6403933.

Parameters:

selector - The associated selector.

selectionKey - The used selection key.

Throws:

IOException

toByteArray

public static byte[] toByteArray(char[] chars)

Converts a char array into a byte array using the default character set.

Parameters:

chars - The source characters.

Returns:

The result bytes.

toByteArray

public static byte[] toByteArray(char[] chars,
                                 String charsetName)

Converts a char array into a byte array using the provided character set.

Parameters:

chars - The source characters.

charsetName - The character set to use.

Returns:

The result bytes.

toCharArray

public static char[] toCharArray(byte[] bytes)

Converts a byte array into a character array using the default character set.

Parameters:

bytes - The source bytes.

Returns:

The result characters.

toCharArray

public static char[] toCharArray(byte[] bytes,
                                 String charsetName)

Converts a byte array into a character array using the default character set.

Parameters:

bytes - The source bytes.

charsetName - The character set to use.

Returns:

The result characters.

toHexString

public static String toHexString(byte[] byteArray)

Converts a byte array into an hexadecimal string.

Parameters:

byteArray - The byte array to convert.

Returns:

The hexadecimal string.

toString

public static String toString(InputStream inputStream)

Converts an input stream to a string.
As this method uses the InputstreamReader class, the default character set is used for decoding the input stream.

Parameters:

inputStream - The input stream.

Returns:

The converted string.

See Also:

InputStreamReader, toString(InputStream, CharacterSet)

toString

public static String toString(InputStream inputStream,
                              CharacterSet characterSet)

Converts an input stream to a string using the specified character set for decoding the input stream. Once read, the input stream is closed.

Parameters:

inputStream - The input stream.

characterSet - The character set

Returns:

The converted string.

See Also:

InputStreamReader

toString

public static String toString(Reader reader)

Converts a reader to a string.

Parameters:

reader - The characters reader.

Returns:

The converted string.

See Also:

InputStreamReader