- java.lang.Object
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- org.apache.lucene.codecs.MultiLevelSkipListWriter
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- org.apache.lucene.codecs.lucene99.Lucene99SkipWriter
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public final class Lucene99SkipWriter extends MultiLevelSkipListWriter
Write skip lists with multiple levels, and support skip within block ints.Assume that docFreq = 28, skipInterval = blockSize = 12
| block#0 | | block#1 | |vInts| d d d d d d d d d d d d d d d d d d d d d d d d d d d d (posting list) ^ ^ (level 0 skip point)
Note that skipWriter will ignore first document in block#0, since it is useless as a skip point. Also, we'll never skip into the vInts block, only record skip data at the start its start point(if it exist).
For each skip point, we will record: 1. docID in former position, i.e. for position 12, record docID[11], etc. 2. its related file points(position, payload), 3. related numbers or uptos(position, payload). 4. start offset.
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Field Summary
Fields Modifier and Type Field Description private CompetitiveImpactAccumulator[]
curCompetitiveFreqNorms
private int
curDoc
private long
curDocPointer
private int
curPayloadByteUpto
private long
curPayPointer
private int
curPosBufferUpto
private long
curPosPointer
private IndexOutput
docOut
private boolean
fieldHasOffsets
private boolean
fieldHasPayloads
private boolean
fieldHasPositions
private ByteBuffersDataOutput
freqNormOut
private boolean
initialized
(package private) long
lastDocFP
(package private) long
lastPayFP
(package private) long
lastPosFP
private int[]
lastSkipDoc
private long[]
lastSkipDocPointer
private long[]
lastSkipPayPointer
private long[]
lastSkipPosPointer
private IndexOutput
payOut
private IndexOutput
posOut
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Fields inherited from class org.apache.lucene.codecs.MultiLevelSkipListWriter
numberOfSkipLevels
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Constructor Summary
Constructors Constructor Description Lucene99SkipWriter(int maxSkipLevels, int blockSize, int docCount, IndexOutput docOut, IndexOutput posOut, IndexOutput payOut)
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description void
bufferSkip(int doc, CompetitiveImpactAccumulator competitiveFreqNorms, int numDocs, long posFP, long payFP, int posBufferUpto, int payloadByteUpto)
Sets the values for the current skip data.private void
initSkip()
void
resetSkip()
Creates new buffers or empties the existing onesvoid
setField(boolean fieldHasPositions, boolean fieldHasOffsets, boolean fieldHasPayloads)
static void
writeImpacts(CompetitiveImpactAccumulator acc, DataOutput out)
protected void
writeSkipData(int level, DataOutput skipBuffer)
Subclasses must implement the actual skip data encoding in this method.-
Methods inherited from class org.apache.lucene.codecs.MultiLevelSkipListWriter
bufferSkip, init, writeChildPointer, writeLevelLength, writeSkip
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Field Detail
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lastSkipDoc
private int[] lastSkipDoc
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lastSkipDocPointer
private long[] lastSkipDocPointer
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lastSkipPosPointer
private long[] lastSkipPosPointer
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lastSkipPayPointer
private long[] lastSkipPayPointer
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docOut
private final IndexOutput docOut
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posOut
private final IndexOutput posOut
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payOut
private final IndexOutput payOut
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curDoc
private int curDoc
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curDocPointer
private long curDocPointer
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curPosPointer
private long curPosPointer
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curPayPointer
private long curPayPointer
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curPosBufferUpto
private int curPosBufferUpto
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curPayloadByteUpto
private int curPayloadByteUpto
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curCompetitiveFreqNorms
private CompetitiveImpactAccumulator[] curCompetitiveFreqNorms
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fieldHasPositions
private boolean fieldHasPositions
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fieldHasOffsets
private boolean fieldHasOffsets
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fieldHasPayloads
private boolean fieldHasPayloads
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initialized
private boolean initialized
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lastDocFP
long lastDocFP
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lastPosFP
long lastPosFP
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lastPayFP
long lastPayFP
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freqNormOut
private final ByteBuffersDataOutput freqNormOut
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Constructor Detail
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Lucene99SkipWriter
public Lucene99SkipWriter(int maxSkipLevels, int blockSize, int docCount, IndexOutput docOut, IndexOutput posOut, IndexOutput payOut)
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Method Detail
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setField
public void setField(boolean fieldHasPositions, boolean fieldHasOffsets, boolean fieldHasPayloads)
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resetSkip
public void resetSkip()
Description copied from class:MultiLevelSkipListWriter
Creates new buffers or empties the existing ones- Overrides:
resetSkip
in classMultiLevelSkipListWriter
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initSkip
private void initSkip()
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bufferSkip
public void bufferSkip(int doc, CompetitiveImpactAccumulator competitiveFreqNorms, int numDocs, long posFP, long payFP, int posBufferUpto, int payloadByteUpto) throws java.io.IOException
Sets the values for the current skip data.- Throws:
java.io.IOException
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writeSkipData
protected void writeSkipData(int level, DataOutput skipBuffer) throws java.io.IOException
Description copied from class:MultiLevelSkipListWriter
Subclasses must implement the actual skip data encoding in this method.- Specified by:
writeSkipData
in classMultiLevelSkipListWriter
- Parameters:
level
- the level skip data shall be writing forskipBuffer
- the skip buffer to write to- Throws:
java.io.IOException
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writeImpacts
public static void writeImpacts(CompetitiveImpactAccumulator acc, DataOutput out) throws java.io.IOException
- Throws:
java.io.IOException
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