org.apache.jasper.xmlparser
Class ASCIIReader

java.lang.Object
  java.io.Reader
      org.apache.jasper.xmlparser.ASCIIReader

All Implemented Interfaces:

Closeable, Readable

public class ASCIIReader
extends Reader

A simple ASCII byte reader. This is an optimized reader for reading byte streams that only contain 7-bit ASCII characters.

Version:

$Id: ASCIIReader.java 1081765 2011-03-15 13:10:33Z markt $

Author:

Andy Clark, IBM

Field Summary

protected byte[]	fBuffer Byte buffer.
protected InputStream	fInputStream Input stream.

Fields inherited from class java.io.Reader

lock

Constructor Summary

ASCIIReader(InputStream inputStream, int size)
Constructs an ASCII reader from the specified input stream and buffer size.

Method Summary

void	close() Close the stream.
void	mark(int readAheadLimit) 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[] ch, int offset, int length) 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 n) Skip characters.

Methods inherited from class java.io.Reader

read, read

Methods inherited from class java.lang.Object

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

Field Detail

fInputStream

protected InputStream fInputStream

Input stream.

fBuffer

protected byte[] fBuffer

Byte buffer.

Constructor Detail

ASCIIReader

public ASCIIReader(InputStream inputStream,
                   int size)

Constructs an ASCII reader from the specified input stream and buffer size.

Parameters:

inputStream - The input stream.

size - The initial buffer size.

Method Detail

read

public int read()
         throws 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 Reader

Returns:

The character read, as an integer in the range 0 to 127 (0x00-0x7f), or -1 if the end of the stream has been reached

Throws:

IOException - If an I/O error occurs

read

public int read(char[] ch,
                int offset,
                int length)
         throws 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 Reader

Parameters:

ch - Destination buffer

offset - Offset at which to start storing characters

length - Maximum number of characters to read

Returns:

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

Throws:

IOException - If an I/O error occurs

skip

public long skip(long n)
          throws 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 Reader

Parameters:

n - The number of characters to skip

Returns:

The number of characters actually skipped

Throws:

IOException - If an I/O error occurs

ready

public boolean ready()
              throws IOException

Tell whether this stream is ready to be read.

Overrides:

ready in class 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:

IOException - If an I/O error occurs

markSupported

public boolean markSupported()

Tell whether this stream supports the mark() operation.

Overrides:

markSupported in class Reader

mark

public void mark(int readAheadLimit)
          throws 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 Reader

Parameters:

readAheadLimit - 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:

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

reset

public void reset()
           throws 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 Reader

Throws:

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 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 Closeable

Specified by:

close in class Reader

Throws:

IOException - If an I/O error occurs