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com.tangosol.io
Class Utf8Reader

java.lang.Object
java.io.Reader
com.tangosol.io.Utf8Reader

All Implemented Interfaces:

java.io.Closeable, java.lang.Readable

public class Utf8Reader

extends java.io.Reader

A Utf8Reader is used to read character data from an underlying stream.

Author:

cp 2002.01.04

Field Summary

Fields inherited from class java.io.Reader

lock

Constructor Summary

Utf8Reader(byte[] ab)
Construct a Utf8Reader that reads the input from a byte array.

Utf8Reader(java.io.InputStream stream)
Construct a Utf8Reader that reads the input from an InputStream.

Method Summary

void	close() Close the stream.
void	mark(int cchLimit) Mark the present position in the stream.
boolean	markSupported() Tell whether this stream supports the mark() operation.
int	read() Read a single character.
int	read(char[] ach) Read characters into an array.
int	read(char[] ach, int of, int cch) Read characters into a portion of an array.
boolean	ready() Tell whether this stream is ready to be read.
void	reset() Reset the stream.
long	skip(long cch) Skip characters.

Methods inherited from class java.io.Reader

read

Constructor Detail

Utf8Reader

public Utf8Reader(byte[] ab)

Construct a Utf8Reader that reads the input from a byte array.

Utf8Reader

public Utf8Reader(java.io.InputStream stream)

Construct a Utf8Reader that reads the input from an InputStream.

Parameters:

stream - the underlying stream to write to

Method Detail

read

public int read()
         throws java.io.IOException

Read a single character. This method will block until a character is available, an I/O error occurs, or the end of the stream is reached.

Subclasses that intend to support efficient single-character input should override this method.

Overrides:

read in class java.io.Reader

Returns:

The character read, as an integer in the range 0 to 65535 (0x00-0xffff), or -1 if the end of the stream has been reached

Throws:

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

read

public int read(char[] ach)
         throws java.io.IOException

Read characters into an array. This method will block until some input is available, an I/O error occurs, or the end of the stream is reached.

Overrides:

read in class java.io.Reader

Parameters:

ach - Destination buffer

Returns:

The number of bytes read, or -1 if the end of the stream has been reached

Throws:

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

read

public int read(char[] ach,
                int of,
                int cch)
         throws java.io.IOException

Read characters into a portion of an array. This method will block until some input is available, an I/O error occurs, or the end of the stream is reached.

Specified by:

read in class java.io.Reader

Parameters:

ach - array of characters to read into

of - offset into the array at which to start storing characters

cch - maximum number of characters to read

Returns:

the number of characters read, or -1 if the end of the stream has been reached

Throws:

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

skip

public long skip(long cch)
          throws java.io.IOException

Skip characters. This method will block until some characters are available, an I/O error occurs, or the end of the stream is reached.

Overrides:

skip in class java.io.Reader

Parameters:

cch - The number of characters to skip

Returns:

The number of characters actually skipped

Throws:

java.lang.IllegalArgumentException - If n is negative.

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

ready

public boolean ready()
              throws java.io.IOException

Tell whether this stream is ready to be read.

Overrides:

ready in class java.io.Reader

Returns:

True if the next read() is guaranteed not to block for input, false otherwise. Note that returning false does not guarantee that the next read will block.

Throws:

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

markSupported

public boolean markSupported()

Tell whether this stream supports the mark() operation. The default implementation always returns false. Subclasses should override this method.

Overrides:

markSupported in class java.io.Reader

Returns:

true if and only if this stream supports the mark operation.

mark

public void mark(int cchLimit)
          throws java.io.IOException

Mark the present position in the stream. Subsequent calls to reset() will attempt to reposition the stream to this point. Not all character-input streams support the mark() operation.

Overrides:

mark in class java.io.Reader

Parameters:

cchLimit - Limit on the number of characters that may be read while still preserving the mark. After reading this many characters, attempting to reset the stream may fail.

Throws:

java.io.IOException - If the stream does not support mark(), or if some other I/O error occurs

reset

public void reset()
           throws java.io.IOException

Reset the stream. If the stream has been marked, then attempt to reposition it at the mark. If the stream has not been marked, then attempt to reset it in some way appropriate to the particular stream, for example by repositioning it to its starting point. Not all character-input streams support the reset() operation, and some support reset() without supporting mark().

Overrides:

reset in class java.io.Reader

Throws:

java.io.IOException - If the stream has not been marked, or if the mark has been invalidated, or if the stream does not support reset(), or if some other I/O error occurs

close

public void close()
           throws java.io.IOException

Close the stream. Once a stream has been closed, further read(), ready(), mark(), or reset() invocations will throw an IOException. Closing a previously-closed stream, however, has no effect.

Specified by:

close in interface java.io.Closeable

Specified by:

close in class java.io.Reader

Throws:

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

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