Package org.apache.cassandra.io.sstable.format.bti

Class PartitionIndex.Reader

java.lang.Object

org.apache.cassandra.io.tries.Walker<PartitionIndex.Reader>

org.apache.cassandra.io.sstable.format.bti.PartitionIndex.Reader

All Implemented Interfaces:

AutoCloseable

Enclosing class:

PartitionIndex

public static class PartitionIndex.Reader
extends Walker<PartitionIndex.Reader>

Provides methods to read the partition index trie. Thread-unsafe, uses class members to store lookup state.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.cassandra.io.tries.Walker

Walker.Extractor<RESULT,VALUE>, Walker.PayloadToString, Walker.TransitionBytesCollector

Field Summary

Fields inherited from class org.apache.cassandra.io.tries.Walker

buf, BYTE_COMPARABLE_VERSION, greaterBranch, lesserBranch, nodeType, NONE, position, root

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	Reader(PartitionIndex index)

Method Summary

Modifier and Type	Method	Description
<ResultType> ResultType	ceiling(PartitionPosition key, PartitionIndex.Acceptor<PartitionPosition,ResultType> acceptor)
long	exactCandidate(DecoratedKey key)	Finds a candidate for an exact key search.
<ResultType> ResultType	floor(PartitionPosition key, PartitionIndex.Acceptor<PartitionPosition,ResultType> acceptor)
long	getCurrentIndexPos()
long	getLastIndexPosition()
Long	getSpecificIndexPos(int pos, int bits)
protected int	payloadSize()	To be used only in analysis.

Methods inherited from class org.apache.cassandra.io.tries.Walker

close, dumpTrie, follow, followWithGreater, followWithLesser, getMaxTerm, getMinTerm, go, goMax, goMin, greaterTransition, hasChildren, hasPayload, lastTransition, lesserTransition, nodeSize, nodeTypeOrdinal, payloadFlags, payloadPosition, prefix, prefixAndNeighbours, search, toString, transition, transitionByte, transitionRange

Methods inherited from class java.lang.Object

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

Constructor Details

Reader

protected Reader(PartitionIndex index)

Method Details

exactCandidate

public long exactCandidate(DecoratedKey key)

Finds a candidate for an exact key search. Returns an ifile (if positive) or dfile (if negative, using ~) position. The position returned has a low chance of being a different entry, but only if the sought key is not present in the file.

ceiling

public <ResultType> ResultType ceiling(PartitionPosition key,
 PartitionIndex.Acceptor<PartitionPosition,ResultType> acceptor)
                                throws IOException

Throws:

IOException

floor

public <ResultType> ResultType floor(PartitionPosition key,
 PartitionIndex.Acceptor<PartitionPosition,ResultType> acceptor)
                              throws IOException

Throws:

IOException

getSpecificIndexPos

public Long getSpecificIndexPos(int pos,
 int bits)

getCurrentIndexPos

public long getCurrentIndexPos()

getLastIndexPosition

public long getLastIndexPosition()

payloadSize

protected int payloadSize()

To be used only in analysis.