Package org.apache.lucene.util.fst
Class OffHeapFSTStore
java.lang.Object
org.apache.lucene.util.fst.OffHeapFSTStore
- All Implemented Interfaces:
Accountable
,FSTReader
,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.
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Field Summary
Fields inherited from interface org.apache.lucene.util.Accountable
NULL_ACCOUNTABLE
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Constructor Summary
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Method Summary
Modifier and TypeMethodDescriptionGet the reverse BytesReader for this FSTInitialize the FSTStorelong
Return the memory usage of this object in bytes.long
size()
void
writeTo
(DataOutput out) Write this FST to another DataOutputMethods 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
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Constructor Details
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OffHeapFSTStore
public OffHeapFSTStore()
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Method Details
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init
Description copied from interface:FSTStore
Initialize the FSTStore- Specified by:
init
in interfaceFSTStore
- Parameters:
in
- the DataInput to read fromnumBytes
- the number of bytes to read- Returns:
- this FSTStore
- Throws:
IOException
- if exception occurred during reading the DataInput
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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 interfaceAccountable
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size
public long size() -
getReverseBytesReader
Description copied from interface:FSTReader
Get the reverse BytesReader for this FST- Specified by:
getReverseBytesReader
in interfaceFSTReader
- Returns:
- the reverse BytesReader
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writeTo
Description copied from interface:FSTReader
Write this FST to another DataOutput- Specified by:
writeTo
in interfaceFSTReader
- Parameters:
out
- the DataOutput- Throws:
IOException
- if exception occurred during writing
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