Package org.apache.lucene.store

Class BufferedIndexOutput

java.lang.Object

org.apache.lucene.store.DataOutput

org.apache.lucene.store.IndexOutput

org.apache.lucene.store.BufferedIndexOutput

All Implemented Interfaces:

Closeable, AutoCloseable

Direct Known Subclasses:

FSDirectory.FSIndexOutput

public abstract class BufferedIndexOutput
extends IndexOutput

Base implementation class for buffered IndexOutput.

Field Summary

Fields

Modifier and Type	Field	Description
static final int	DEFAULT_BUFFER_SIZE	The default buffer size in bytes (16384).

Constructor Summary

Constructors

Constructor	Description
BufferedIndexOutput()	Creates a new BufferedIndexOutput with the default buffer size (16384 bytes see DEFAULT_BUFFER_SIZE)
BufferedIndexOutput(int bufferSize)	Creates a new BufferedIndexOutput with the given buffer size.

Method Summary

Modifier and Type	Method	Description
void	close()	Closes this stream to further operations.
void	flush()	Forces any buffered output to be written.
protected abstract void	flushBuffer(byte[] b, int offset, int len)	Expert: implements buffer write.
final int	getBufferSize()	Returns size of the used output buffer in bytes.
long	getFilePointer()	Returns the current position in this file, where the next write will occur.
abstract long	length()	The number of bytes in the file.
void	seek(long pos)	Sets current position in this file, where the next write will occur.
void	writeByte(byte b)	Writes a single byte.
void	writeBytes(byte[] b, int offset, int length)	Writes an array of bytes.

Methods inherited from class org.apache.lucene.store.IndexOutput

setLength

Methods inherited from class org.apache.lucene.store.DataOutput

copyBytes, writeBytes, writeInt, writeLong, writeShort, writeString, writeStringSet, writeStringStringMap, writeVInt, writeVLong

Methods inherited from class java.lang.Object

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

Field Details

DEFAULT_BUFFER_SIZE

public static final int DEFAULT_BUFFER_SIZE

The default buffer size in bytes (16384).

See Also:

• Constant Field Values

Constructor Details

BufferedIndexOutput

public BufferedIndexOutput()

Creates a new BufferedIndexOutput with the default buffer size (16384 bytes see DEFAULT_BUFFER_SIZE)

BufferedIndexOutput

public BufferedIndexOutput(int bufferSize)

Creates a new BufferedIndexOutput with the given buffer size.

Parameters:

bufferSize - the buffer size in bytes used to buffer writes internally.

Throws:

IllegalArgumentException - if the given buffer size is less or equal to 0

Method Details

writeByte

public void writeByte(byte b)
               throws IOException

Description copied from class: DataOutput

Writes a single byte.

The most primitive data type is an eight-bit byte. Files are accessed as sequences of bytes. All other data types are defined as sequences of bytes, so file formats are byte-order independent.

Specified by:

writeByte in class DataOutput

Throws:

IOException

See Also:

• DataInput.readByte()

writeBytes

public void writeBytes(byte[] b,
 int offset,
 int length)
                throws IOException

Description copied from class: DataOutput

Writes an array of bytes.

Specified by:

writeBytes in class DataOutput

Parameters:

b - the bytes to write

offset - the offset in the byte array

length - the number of bytes to write

Throws:

IOException

See Also:

• DataInput.readBytes(byte[],int,int)

flush

public void flush()
           throws IOException

Description copied from class: IndexOutput

Forces any buffered output to be written.

Specified by:

flush in class IndexOutput

Throws:

IOException

flushBuffer

protected abstract void flushBuffer(byte[] b,
 int offset,
 int len)
                             throws IOException

Expert: implements buffer write. Writes bytes at the current position in the output.

Parameters:

b - the bytes to write

offset - the offset in the byte array

len - the number of bytes to write

Throws:

IOException

close

public void close()
           throws IOException

Description copied from class: IndexOutput

Closes this stream to further operations.

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

Specified by:

close in class IndexOutput

Throws:

IOException

getFilePointer

public long getFilePointer()

Description copied from class: IndexOutput

Returns the current position in this file, where the next write will occur.

Specified by:

getFilePointer in class IndexOutput

See Also:

• IndexOutput.seek(long)

seek

public void seek(long pos)
          throws IOException

Description copied from class: IndexOutput

Sets current position in this file, where the next write will occur.

Specified by:

seek in class IndexOutput

Throws:

IOException

See Also:

• IndexOutput.getFilePointer()

length

public abstract long length()
                     throws IOException

Description copied from class: IndexOutput

The number of bytes in the file.

Specified by:

length in class IndexOutput

Throws:

IOException

getBufferSize

public final int getBufferSize()

Returns size of the used output buffer in bytes.