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org.apache.derby.impl.jdbc
Class ReaderToUTF8Stream  

java.lang.Object
  java.io.InputStream
      org.apache.derby.impl.jdbc.ReaderToUTF8Stream

All Implemented Interfaces:

java.io.Closeable

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final class ReaderToUTF8Stream

extends java.io.InputStream

Converts a java.io.Reader to the on-disk UTF8 format used by Cloudscape.

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Field Summary
private  int	blen
private  int	boff
private  byte[]	buffer
private static int	BUFSIZE
private  boolean	eof
private  boolean	multipleBuffer
private  org.apache.derby.iapi.services.io.LimitReader	reader

 

Constructor Summary
(package private)	ReaderToUTF8Stream(org.apache.derby.iapi.services.io.LimitReader reader)

 

Method Summary
int	available()           Return an optimized version of bytes available to read from the stream Note, it is not exactly per java.io.InputStream#available()
private  void	checkSufficientData()           JDBC 3.0 (from tutorial book) requires that an input stream has the correct number of bytes in the stream.
void	close()           This method closes the stream.
private  void	fillBuffer(int startingOffset)
int	read()           This method reads an unsigned byte from the input stream and returns it as an int in the range of 0-255.
int	read(byte[] b, int off, int len)           This method read bytes from a stream and stores them into a caller supplied buffer.

 

Methods inherited from class java.io.InputStream

mark, markSupported, read, reset, skip

 

Methods inherited from class java.lang.Object

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

 

Field Detail

reader

private org.apache.derby.iapi.services.io.LimitReader reader

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buffer

private byte[] buffer

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boff

private int boff

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blen

private int blen

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eof

private boolean eof

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multipleBuffer

private boolean multipleBuffer

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BUFSIZE

private static final int BUFSIZE

See Also:

Constant Field Values

Constructor Detail

ReaderToUTF8Stream

ReaderToUTF8Stream(org.apache.derby.iapi.services.io.LimitReader reader)

Method Detail

read

public int read()
         throws java.io.IOException

Description copied from class: java.io.InputStream

This method reads an unsigned byte from the input stream and returns it as an int in the range of 0-255. This method also will return -1 if the end of the stream has been reached.

This method will block until the byte can be read.

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read

public int read(byte[] b,
                int off,
                int len)
         throws java.io.IOException

Description copied from class: java.io.InputStream

This method read bytes from a stream and stores them into a caller supplied buffer. It starts storing the data at index off into the buffer and attempts to read len bytes. This method can return before reading the number of bytes requested. The actual number of bytes read is returned as an int. A -1 is returned to indicate the end of the stream.

This method will block until some data can be read.

This method operates by calling the single byte read() method in a loop until the desired number of bytes are read. The read loop stops short if the end of the stream is encountered or if an IOException is encountered on any read operation except the first. If the first attempt to read a bytes fails, the IOException is allowed to propagate upward. And subsequent IOException is caught and treated identically to an end of stream condition. Subclasses can (and should if possible) override this method to provide a more efficient implementation.

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fillBuffer

private void fillBuffer(int startingOffset)
                 throws java.io.IOException

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checkSufficientData

private void checkSufficientData()
                          throws java.io.IOException

JDBC 3.0 (from tutorial book) requires that an input stream has the correct number of bytes in the stream.

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close

public void close()
           throws java.io.IOException

Description copied from class: java.io.InputStream

This method closes the stream. Any futher attempts to read from the stream may generate an IOException

This method does nothing in this class, but subclasses may override this method in order to provide additional functionality.

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available

public final int available()

Return an optimized version of bytes available to read from the stream Note, it is not exactly per java.io.InputStream#available()

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Overview  Package   Class  Use  Deprecated  Index
Home >> All >> org >> apache >> derby >> impl >> [ jdbc overview ]	PREV CLASS  NEXT CLASS
SUMMARY:  JAVADOC |  SOURCE |  DOWNLOAD | NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

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