org.apache.derbyTesting.functionTests.util.streams
Class LoopingAlphabetStream

java.lang.Object
  java.io.InputStream
      org.apache.derbyTesting.functionTests.util.streams.LoopingAlphabetStream

All Implemented Interfaces:

java.io.Closeable, org.apache.derby.iapi.types.Resetable

public class LoopingAlphabetStream
extends java.io.InputStream
implements org.apache.derby.iapi.types.Resetable

A stream returning a cycle of the 26 lowercase letters of the modern Latin alphabet.

Field Summary

private ByteAlphabet	alphabet
private byte[]	buffer
private long	length Length of the stream.
private static int	MAX_BUF_SIZE Maximum size of buffer.
private long	remainingBlanks Remaining bytes in the stream.
private long	remainingNonBlanks
private static byte	SPACE
private int	trailingBlanks

Constructor Summary

LoopingAlphabetStream(long length)
Create a looping modern latin alphabet stream of the specified length.

LoopingAlphabetStream(long length, ByteAlphabet alphabet)
Create a looping alphabet of the specified type and length.

LoopingAlphabetStream(long length, ByteAlphabet alphabet, int trailingBlanks)

LoopingAlphabetStream(long length, int trailingBlanks)
Creates a looping alphabet stream with the specified length, in which the last characters are blanks.

Method Summary

int	available() Return remaining bytes in the stream.
void	closeStream()
private int	fillBlanks(byte[] buf, int off, int length)
private void	fillBuffer(int bufSize) Fill internal buffer of bytes (from character sequence).
void	initStream()
int	read()
int	read(byte[] buf, int off, int length)
void	reset() Reset the stream.
void	resetStream()

Methods inherited from class java.io.InputStream

close, mark, markSupported, read, skip

Methods inherited from class java.lang.Object

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

Field Detail

MAX_BUF_SIZE

private static final int MAX_BUF_SIZE

Maximum size of buffer. Balance between size and memory usage.

See Also:

Constant Field Values

SPACE

private static final byte SPACE

See Also:

Constant Field Values

length

private final long length

Length of the stream.

trailingBlanks

private final int trailingBlanks

remainingBlanks

private long remainingBlanks

Remaining bytes in the stream.

remainingNonBlanks

private long remainingNonBlanks

buffer

private byte[] buffer

alphabet

private final ByteAlphabet alphabet

Constructor Detail

LoopingAlphabetStream

public LoopingAlphabetStream(long length)

Create a looping modern latin alphabet stream of the specified length.

Parameters:

length - the number of characters (and also the number of bytes)

LoopingAlphabetStream

public LoopingAlphabetStream(long length,
                             int trailingBlanks)

Creates a looping alphabet stream with the specified length, in which the last characters are blanks.

Parameters:

length - total length of the stream

trailingBlanks - number of trailing blanks

LoopingAlphabetStream

public LoopingAlphabetStream(long length,
                             ByteAlphabet alphabet)

Create a looping alphabet of the specified type and length.

Parameters:

length - the number of bytes in the stream

alphabet - the alphabet to loop over

LoopingAlphabetStream

public LoopingAlphabetStream(long length,
                             ByteAlphabet alphabet,
                             int trailingBlanks)

Method Detail

read

public int read()

Specified by:

read in class java.io.InputStream

read

public int read(byte[] buf,
                int off,
                int length)

Overrides:

read in class java.io.InputStream

reset

public void reset()

Reset the stream.

Overrides:

reset in class java.io.InputStream

available

public int available()

Return remaining bytes in the stream.

Overrides:

available in class java.io.InputStream

fillBuffer

private void fillBuffer(int bufSize)

Fill internal buffer of bytes (from character sequence).

Parameters:

bufSize - the wanted size, might be ignored if too big

fillBlanks

private int fillBlanks(byte[] buf,
                       int off,
                       int length)

resetStream

public void resetStream()

Specified by:

resetStream in interface org.apache.derby.iapi.types.Resetable

initStream

public void initStream()

Specified by:

initStream in interface org.apache.derby.iapi.types.Resetable

closeStream

public void closeStream()

Specified by:

closeStream in interface org.apache.derby.iapi.types.Resetable