com.sleepycat.util

Class FastOutputStream

java.lang.Object

java.io.OutputStream

com.sleepycat.util.FastOutputStream

All Implemented Interfaces:

java.io.Closeable, java.io.Flushable, java.lang.AutoCloseable

Direct Known Subclasses:

TupleOutput

public class FastOutputStream
extends java.io.OutputStream

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

This class extends OutputStream and its write() methods allow it to be used as a standard output stream. In addition, it provides writeFast() 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
static int	DEFAULT_BUMP_SIZE The default amount that the buffer is increased when it is full.
static int	DEFAULT_INIT_SIZE The default initial size of the buffer if no initialSize parameter is specified.

Constructor Summary

Constructors

Constructor and Description
FastOutputStream() Creates an output stream with default sizes.
FastOutputStream(byte[] buffer) Creates an output stream with a given initial buffer and a default bump size.
FastOutputStream(byte[] buffer, int bumpSize) Creates an output stream with a given initial buffer and a given bump size.
FastOutputStream(int initialSize) Creates an output stream with a default bump size and a given initial size.
FastOutputStream(int initialSize, int bumpSize) Creates an output stream with a given bump size and initial size.

Method Summary

Modifier and Type	Method and Description
void	addSize(int sizeAdded) Skip the given number of bytes in the buffer.
byte[]	getBufferBytes() Returns the buffer owned by this object.
int	getBufferLength() Returns the length used in the internal buffer, i.e., the offset at which data will be written next.
int	getBufferOffset() Returns the offset of the internal buffer.
void	makeSpace(int sizeNeeded) Ensure that at least the given number of bytes are available in the internal buffer.
void	reset()
int	size()
byte[]	toByteArray()
java.lang.String	toString()
java.lang.String	toString(java.lang.String encoding)
void	write(byte[] fromBuf)
void	write(byte[] fromBuf, int offset, int length)
void	write(int b)
void	writeFast(byte[] fromBuf) Equivalent to write(byte[]) but does not throw IOException.
void	writeFast(byte[] fromBuf, int offset, int length) Equivalent to write(byte[],int,int) but does not throw IOException.
void	writeFast(int b) Equivalent to write(int) but does not throw IOException.
void	writeTo(java.io.OutputStream out)

Methods inherited from class java.io.OutputStream

close, flush

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_INIT_SIZE

public static final int DEFAULT_INIT_SIZE

The default initial size of the buffer if no initialSize parameter is specified. This constant is 100 bytes.

See Also:

Constant Field Values

DEFAULT_BUMP_SIZE

public static final int DEFAULT_BUMP_SIZE

The default amount that the buffer is increased when it is full. This constant is zero, which means to double the current buffer size.

See Also:

Constant Field Values

Constructor Detail

FastOutputStream

public FastOutputStream()

Creates an output stream with default sizes.

FastOutputStream

public FastOutputStream(int initialSize)

Creates an output stream with a default bump size and a given initial size.

Parameters:

initialSize - the initial size of the buffer.

FastOutputStream

public FastOutputStream(int initialSize,
                        int bumpSize)

Creates an output stream with a given bump size and initial size.

Parameters:

initialSize - the initial size of the buffer.

bumpSize - the amount to increment the buffer.

FastOutputStream

public FastOutputStream(byte[] buffer)

Creates an output stream with a given initial buffer and a default bump size.

Parameters:

buffer - the initial buffer; will be owned by this object.

FastOutputStream

public FastOutputStream(byte[] buffer,
                        int bumpSize)

Creates an output stream with a given initial buffer and a given bump size.

Parameters:

buffer - the initial buffer; will be owned by this object.

bumpSize - the amount to increment the buffer. If zero (the default), the current buffer size will be doubled when the buffer is full.

Method Detail

size

public int size()

reset

public void reset()

write

public void write(int b)

Specified by:

write in class java.io.OutputStream

write

public void write(byte[] fromBuf)

Overrides:

write in class java.io.OutputStream

write

public void write(byte[] fromBuf,
                  int offset,
                  int length)

Overrides:

write in class java.io.OutputStream

writeTo

public void writeTo(java.io.OutputStream out)
             throws java.io.IOException

Throws:

java.io.IOException

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

toString

public java.lang.String toString(java.lang.String encoding)
                          throws java.io.UnsupportedEncodingException

Throws:

java.io.UnsupportedEncodingException

toByteArray

public byte[] toByteArray()

writeFast

public final void writeFast(int b)

Equivalent to write(int) but does not throw IOException.

Parameters:

b - the byte to write.

See Also:

write(int)

writeFast

public final void writeFast(byte[] fromBuf)

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

Parameters:

fromBuf - the buffer to write.

See Also:

write(byte[])

writeFast

public final void writeFast(byte[] fromBuf,
                            int offset,
                            int length)

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

Parameters:

fromBuf - the buffer to write.

offset - the start offset in the buffer.

length - the number of bytes to write.

See Also:

write(byte[],int,int)

getBufferBytes

public byte[] getBufferBytes()

Returns the buffer owned by this object.

Returns:

the buffer.

getBufferOffset

public int getBufferOffset()

Returns the offset of the internal buffer.

Returns:

always zero currently.

getBufferLength

public int getBufferLength()

Returns the length used in the internal buffer, i.e., the offset at which data will be written next.

Returns:

the buffer length.

makeSpace

public void makeSpace(int sizeNeeded)

Ensure that at least the given number of bytes are available in the internal buffer.

Parameters:

sizeNeeded - the number of bytes desired.

addSize

public void addSize(int sizeAdded)

Skip the given number of bytes in the buffer.

Parameters:

sizeAdded - number of bytes to skip.