com.sleepycat.util

Class FastInputStream

java.lang.Object

java.io.InputStream

com.sleepycat.util.FastInputStream

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable

Direct Known Subclasses:

TupleInput

public class FastInputStream
extends java.io.InputStream

A replacement for ByteArrayInputStream that does not synchronize every byte read.

This class extends InputStream and its read() methods allow it to be used as a standard input stream. In addition, it provides readFast() methods that are not declared to throw IOException. IOException is never thrown by this class.

Author:

Mark Hayes

Field Summary

Fields

Modifier and Type	Field and Description
protected byte[]	buf
protected int	len
protected int	mark
protected int	off

Constructor Summary

Constructors

Constructor and Description
FastInputStream(byte[] buffer) Creates an input stream.
FastInputStream(byte[] buffer, int offset, int length) Creates an input stream.

Method Summary

Modifier and Type	Method and Description
int	available()
byte[]	getBufferBytes() Returns the underlying data being read.
int	getBufferLength() Returns the end of the buffer being read.
int	getBufferOffset() Returns the offset at which data is being read from the buffer.
void	mark(int readLimit)
boolean	markSupported()
int	read()
int	read(byte[] toBuf)
int	read(byte[] toBuf, int offset, int length)
int	readFast() Equivalent to read() but does not throw IOException.
int	readFast(byte[] toBuf) Equivalent to read(byte[]) but does not throw IOException.
int	readFast(byte[] toBuf, int offset, int length) Equivalent to read(byte[],int,int) but does not throw IOException.
void	reset()
long	skip(long count)
void	skipFast(int count) Equivalent to skip() but takes an int parameter instead of a long, and does not check whether the count given is larger than the number of remaining bytes.

Methods inherited from class java.io.InputStream

close

Methods inherited from class java.lang.Object

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

Field Detail

len

protected int len

off

protected int off

mark

protected int mark

buf

protected byte[] buf

Constructor Detail

FastInputStream

public FastInputStream(byte[] buffer)

Creates an input stream.

Parameters:

buffer - the data to read.

FastInputStream

public FastInputStream(byte[] buffer,
                       int offset,
                       int length)

Creates an input stream.

Parameters:

buffer - the data to read.

offset - the byte offset at which to begin reading.

length - the number of bytes to read.

Method Detail

available

public int available()

Overrides:

available in class java.io.InputStream

markSupported

public boolean markSupported()

Overrides:

markSupported in class java.io.InputStream

mark

public void mark(int readLimit)

Overrides:

mark in class java.io.InputStream

reset

public void reset()

Overrides:

reset in class java.io.InputStream

skip

public long skip(long count)

Overrides:

skip in class java.io.InputStream

read

public int read()

Specified by:

read in class java.io.InputStream

read

public int read(byte[] toBuf)

Overrides:

read in class java.io.InputStream

read

public int read(byte[] toBuf,
                int offset,
                int length)

Overrides:

read in class java.io.InputStream

skipFast

public final void skipFast(int count)

Equivalent to skip() but takes an int parameter instead of a long, and does not check whether the count given is larger than the number of remaining bytes.

Parameters:

count - the number of bytes to skip.

See Also:

skip(long)

readFast

public final int readFast()

Equivalent to read() but does not throw IOException.

Returns:

the next byte of data, or -1 if at the end of the stream.

See Also:

read()

readFast

public final int readFast(byte[] toBuf)

Equivalent to read(byte[]) but does not throw IOException.

Parameters:

toBuf - the buffer into which the data is read.

Returns:

the number of bytes read, or -1 if at the end of the stream.

See Also:

read(byte[])

readFast

public final int readFast(byte[] toBuf,
                          int offset,
                          int length)

Equivalent to read(byte[],int,int) but does not throw IOException.

Parameters:

toBuf - the buffer into which the data is read.

offset - the start offset in array at which the data is written.

length - the maximum number of bytes to read.

Returns:

the number of bytes read, or -1 if at the end of the stream.

See Also:

read(byte[],int,int)

getBufferBytes

public final byte[] getBufferBytes()

Returns the underlying data being read.

Returns:

the underlying data.

getBufferOffset

public final int getBufferOffset()

Returns the offset at which data is being read from the buffer.

Returns:

the offset at which data is being read.

getBufferLength

public final int getBufferLength()

Returns the end of the buffer being read.

Returns:

the end of the buffer.