Module org.apache.lucene.core

Package org.apache.lucene.util.fst

Class BytesStore

java.lang.Object

org.apache.lucene.store.DataOutput

org.apache.lucene.util.fst.BytesStore

All Implemented Interfaces:

Accountable, FSTReader

class BytesStore
extends DataOutput
implements FSTReader

Field Summary

Fields

Modifier and Type	Field	Description
private static final long	BASE_RAM_BYTES_USED
private final int	blockBits
private final int	blockMask
private final List<byte[]>	blocks
private final int	blockSize
private byte[]	current
private int	nextWrite

Fields inherited from interface org.apache.lucene.util.Accountable

NULL_ACCOUNTABLE

Constructor Summary

Constructors

Constructor	Description
BytesStore(int blockBits)

Method Summary

Modifier and Type	Method	Description
void	copyBytes(long src, long dest, int len)	Absolute copy bytes self to self, without changing the position.
void	copyBytes(DataInput input, long numBytes)	Copy numBytes bytes from input to ourself.
void	finish()
(package private) int	getBlockBits()
FST.BytesReader	getForwardReader()
long	getPosition()
FST.BytesReader	getReverseBytesReader()	Get the reverse BytesReader for this FST
long	ramBytesUsed()	Return the memory usage of this object in bytes.
void	reverse(long srcPos, long destPos)	Reverse from srcPos, inclusive, to destPos, inclusive.
void	setPosition(long newLen)	Set the position of this BytesStore, truncating or expanding if needed
private void	skipBytes(int len)
String	toString()
void	writeByte(byte b)	Writes a single byte.
void	writeBytes(byte[] b, int offset, int len)	Writes an array of bytes.
(package private) void	writeBytes(long dest, byte[] b, int offset, int len)	Absolute writeBytes without changing the current position.
void	writeTo(long src, byte[] dest, int offset, int len)	Copies bytes from this store to a target byte array.
void	writeTo(DataOutput out)	Writes all of our bytes to the target DataOutput.

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

writeBytes, writeInt, writeLong, writeMapOfStrings, writeSetOfStrings, writeShort, writeString, writeVInt, writeVLong, writeZInt, writeZLong

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.lucene.util.Accountable

getChildResources

Field Details

BASE_RAM_BYTES_USED

private static final long BASE_RAM_BYTES_USED

blocks

private final List<byte[]> blocks

blockSize

private final int blockSize

blockBits

private final int blockBits

blockMask

private final int blockMask

current

private byte[] current

nextWrite

private int nextWrite

Constructor Details

BytesStore

public BytesStore(int blockBits)

Method Details

writeByte

public void writeByte(byte b)

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

See Also:

• DataInput.readByte()

writeBytes

public void writeBytes(byte[] b,
 int offset,
 int len)

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

len - the number of bytes to write

See Also:

• DataInput.readBytes(byte[],int,int)

getBlockBits

int getBlockBits()

writeBytes

void writeBytes(long dest,
 byte[] b,
 int offset,
 int len)

Absolute writeBytes without changing the current position. Note: this cannot "grow" the bytes, so you must only call it on already written parts.

copyBytes

public void copyBytes(DataInput input,
 long numBytes)
               throws IOException

Description copied from class: DataOutput

Copy numBytes bytes from input to ourself.

Overrides:

copyBytes in class DataOutput

Throws:

IOException

copyBytes

public void copyBytes(long src,
 long dest,
 int len)

Absolute copy bytes self to self, without changing the position. Note: this cannot "grow" the bytes, so must only call it on already written parts.

writeTo

public void writeTo(long src,
 byte[] dest,
 int offset,
 int len)

Copies bytes from this store to a target byte array.

reverse

public void reverse(long srcPos,
 long destPos)

Reverse from srcPos, inclusive, to destPos, inclusive.

skipBytes

private void skipBytes(int len)

getPosition

public long getPosition()

setPosition

public void setPosition(long newLen)

Set the position of this BytesStore, truncating or expanding if needed

finish

public void finish()

writeTo

public void writeTo(DataOutput out)
             throws IOException

Writes all of our bytes to the target DataOutput.

Specified by:

writeTo in interface FSTReader

Parameters:

out - the DataOutput

Throws:

IOException - if exception occurred during writing

getForwardReader

public FST.BytesReader getForwardReader()

getReverseBytesReader

public FST.BytesReader getReverseBytesReader()

Description copied from interface: FSTReader

Get the reverse BytesReader for this FST

Specified by:

getReverseBytesReader in interface FSTReader

Returns:

the reverse BytesReader

ramBytesUsed

public long ramBytesUsed()

Description copied from interface: Accountable

Return the memory usage of this object in bytes. Negative values are illegal.

Specified by:

ramBytesUsed in interface Accountable

toString

public String toString()

Overrides:

toString in class Object