org.apache.lucene.util.fst

Class OffHeapFSTStore

java.lang.Object

org.apache.lucene.util.fst.OffHeapFSTStore

All Implemented Interfaces:

Accountable, FSTStore

public final class OffHeapFSTStore
extends Object
implements FSTStore

Provides off heap storage of finite state machine (FST), using underlying index input instead of byte store on heap

WARNING: This API is experimental and might change in incompatible ways in the next release.

Field Summary

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

NULL_ACCOUNTABLE

Constructor Summary

Constructors

Constructor and Description
OffHeapFSTStore()

Method Summary

Modifier and Type	Method and Description
FST.BytesReader	getReverseBytesReader()
void	init(DataInput in, long numBytes)
long	ramBytesUsed() Return the memory usage of this object in bytes.
long	size()
void	writeTo(DataOutput out)

Methods inherited from class java.lang.Object

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

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

getChildResources

Constructor Detail

OffHeapFSTStore

public OffHeapFSTStore()

Method Detail

init

public void init(DataInput in,
                 long numBytes)
          throws IOException

Specified by:

init in interface FSTStore

Throws:

IOException

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

size

public long size()

Specified by:

size in interface FSTStore

getReverseBytesReader

public FST.BytesReader getReverseBytesReader()

Specified by:

getReverseBytesReader in interface FSTStore

writeTo

public void writeTo(DataOutput out)
             throws IOException

Specified by:

writeTo in interface FSTStore

Throws:

IOException