Package org.apache.lucene.util.packed

Class DirectMonotonicReader

java.lang.Object

org.apache.lucene.util.LongValues

org.apache.lucene.util.packed.DirectMonotonicReader

All Implemented Interfaces:

Accountable

public final class DirectMonotonicReader
extends LongValues
implements Accountable

Retrieves an instance previously written by DirectMonotonicWriter.

See Also:

DirectMonotonicWriter

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	DirectMonotonicReader.Meta	In-memory metadata that needs to be kept around for DirectMonotonicReader to read data from disk.

Field Summary

Fields

Modifier and Type	Field	Description
private float[]	avgs
private static long	BASE_RAM_BYTES_USED
private int	blockShift
private byte[]	bpvs
private static LongValues	EMPTY	An instance that always returns 0.
private long[]	mins
private int	nonZeroBpvs
private LongValues[]	readers

Fields inherited from class org.apache.lucene.util.LongValues

IDENTITY, ZEROES

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

NULL_ACCOUNTABLE

Constructor Summary

Constructors

Modifier	Constructor	Description
private	DirectMonotonicReader(int blockShift, LongValues[] readers, long[] mins, float[] avgs, byte[] bpvs)

Method Summary

Modifier and Type	Method	Description
long	binarySearch(long fromIndex, long toIndex, long key)	Return the index of a key if it exists, or its insertion point otherwise like Arrays.binarySearch(long[], int, int, long).
long	get(long index)	Get value at index.
private long[]	getBounds(long index)	Get lower/upper bounds for the value at a given index without hitting the direct reader.
static DirectMonotonicReader	getInstance(DirectMonotonicReader.Meta meta, RandomAccessInput data)	Retrieves an instance from the specified slice.
static DirectMonotonicReader.Meta	loadMeta(IndexInput metaIn, long numValues, int blockShift)	Load metadata from the given IndexInput.
long	ramBytesUsed()	Return the memory usage of this object in bytes.

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

Field Detail

BASE_RAM_BYTES_USED

private static final long BASE_RAM_BYTES_USED

EMPTY

private static final LongValues EMPTY

An instance that always returns 0.

blockShift

private final int blockShift

readers

private final LongValues[] readers

mins

private final long[] mins

avgs

private final float[] avgs

bpvs

private final byte[] bpvs

nonZeroBpvs

private final int nonZeroBpvs

Constructor Detail

DirectMonotonicReader

private DirectMonotonicReader(int blockShift,
                              LongValues[] readers,
                              long[] mins,
                              float[] avgs,
                              byte[] bpvs)

Method Detail

loadMeta

public static DirectMonotonicReader.Meta loadMeta(IndexInput metaIn,
                                                  long numValues,
                                                  int blockShift)
                                           throws java.io.IOException

Load metadata from the given IndexInput.

Throws:

java.io.IOException

See Also:

getInstance(Meta, RandomAccessInput)

getInstance

public static DirectMonotonicReader getInstance(DirectMonotonicReader.Meta meta,
                                                RandomAccessInput data)
                                         throws java.io.IOException

Retrieves an instance from the specified slice.

Throws:

java.io.IOException

get

public long get(long index)

Description copied from class: LongValues

Get value at index.

Specified by:

get in class LongValues

getBounds

private long[] getBounds(long index)

Get lower/upper bounds for the value at a given index without hitting the direct reader.

binarySearch

public long binarySearch(long fromIndex,
                         long toIndex,
                         long key)

Return the index of a key if it exists, or its insertion point otherwise like Arrays.binarySearch(long[], int, int, long).

See Also:

Arrays.binarySearch(long[], int, int, long)

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