PointValues (Lucene 8.9.0 API)乐学网一站式学习平台

java.lang.Object
- org.apache.lucene.index.PointValues

Direct Known Subclasses:: BKDReader, MutablePointValues

public abstract class PointValues
extends Object

Access to indexed numeric values.

Points represent numeric values and are indexed differently than ordinary text. Instead of an inverted index, points are indexed with datastructures such as KD-trees. These structures are optimized for operations such as range, distance, nearest-neighbor, and point-in-polygon queries.

Basic Point Types

Basic point types in Java and Lucene
Java type	Lucene class
`int`	`IntPoint`
`long`	`LongPoint`
`float`	`FloatPoint`
`double`	`DoublePoint`
`byte[]`	`BinaryPoint`
`BigInteger`	BigIntegerPoint*
`InetAddress`	InetAddressPoint*

* in the lucene-sandbox jar

Basic Lucene point types behave like their java peers: for example IntPoint represents a signed 32-bit Integer, supporting values ranging from Integer.MIN_VALUE to Integer.MAX_VALUE, ordered consistent with Integer.compareTo(Integer). In addition to indexing support, point classes also contain static methods (such as IntPoint.newRangeQuery(String, int, int)) for creating common queries. For example:

   // add year 1970 to document
   document.add(new IntPoint("year", 1970));
   // index document
   writer.addDocument(document);
   ...
   // issue range query of 1960-1980
   Query query = IntPoint.newRangeQuery("year", 1960, 1980);
   TopDocs docs = searcher.search(query, ...);

Geospatial Point Types

Although basic point types such as DoublePoint support points in multi-dimensional space too, Lucene has specialized classes for location data. These classes are optimized for location data: they are more space-efficient and support special operations such as distance and polygon queries. There are currently two implementations:

LatLonPoint: indexes (latitude,longitude) as (x,y) in two-dimensional space.
Geo3DPoint* in lucene-spatial3d: indexes (latitude,longitude) as (x,y,z) in three-dimensional space.

* does not support altitude, 3D here means "uses three dimensions under-the-hood"

Advanced usage

Custom structures can be created on top of single- or multi- dimensional basic types, on top of BinaryPoint for more flexibility, or via custom Field subclasses.

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

Nested Class Summary

Nested Classes
Modifier and Type	Class and Description
`static interface`	`PointValues.IntersectVisitor` We recurse the BKD tree, using a provided instance of this to guide the recursion.
`static class`	`PointValues.Relation` Used by `intersect(org.apache.lucene.index.PointValues.IntersectVisitor)` to check how each recursive cell corresponds to the query.

Field Summary

Fields
Modifier and Type	Field and Description
`static int`	`MAX_DIMENSIONS` Maximum number of dimensions
`static int`	`MAX_INDEX_DIMENSIONS` Maximum number of index dimensions
`static int`	`MAX_NUM_BYTES` Maximum number of bytes for each dimension

Constructor Summary

Constructors
Modifier Constructor and Description

protected PointValues()
Default constructor

Constructors
Modifier	Constructor and Description
`protected`	`PointValues()` Default constructor

Method Summary

All Methods Static Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method and Description
`long`	`estimateDocCount(PointValues.IntersectVisitor visitor)` Estimate the number of documents that would be matched by `intersect(org.apache.lucene.index.PointValues.IntersectVisitor)` with the given `PointValues.IntersectVisitor`.
`abstract long`	`estimatePointCount(PointValues.IntersectVisitor visitor)` Estimate the number of points that would be visited by `intersect(org.apache.lucene.index.PointValues.IntersectVisitor)` with the given `PointValues.IntersectVisitor`.
`abstract int`	`getBytesPerDimension()` Returns the number of bytes per dimension
`abstract int`	`getDocCount()` Returns the total number of documents that have indexed at least one point.
`static int`	`getDocCount(IndexReader reader, String field)` Return the cumulated number of docs that have points across all leaves of the given `IndexReader`.
`abstract byte[]`	`getMaxPackedValue()` Returns maximum value for each dimension, packed, or null if `size(org.apache.lucene.index.IndexReader, java.lang.String)` is `0`
`static byte[]`	`getMaxPackedValue(IndexReader reader, String field)` Return the maximum packed values across all leaves of the given `IndexReader`.
`abstract byte[]`	`getMinPackedValue()` Returns minimum value for each dimension, packed, or null if `size(org.apache.lucene.index.IndexReader, java.lang.String)` is `0`
`static byte[]`	`getMinPackedValue(IndexReader reader, String field)` Return the minimum packed values across all leaves of the given `IndexReader`.
`abstract int`	`getNumDimensions()` Returns how many dimensions are represented in the values
`abstract int`	`getNumIndexDimensions()` Returns how many dimensions are used for the index
`abstract void`	`intersect(PointValues.IntersectVisitor visitor)` Finds all documents and points matching the provided visitor.
`abstract long`	`size()` Returns the total number of indexed points across all documents.
`static long`	`size(IndexReader reader, String field)` Return the cumulated number of points across all leaves of the given `IndexReader`.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - MAX_NUM_BYTES
```
public static final int MAX_NUM_BYTES
```
    Maximum number of bytes for each dimension
    
    See Also:
    
    Constant Field Values
  - MAX_DIMENSIONS
```
public static final int MAX_DIMENSIONS
```
    Maximum number of dimensions
    
    See Also:
    
    Constant Field Values
  - MAX_INDEX_DIMENSIONS
```
public static final int MAX_INDEX_DIMENSIONS
```
    Maximum number of index dimensions
    
    See Also:
    
    Constant Field Values
- Constructor Detail
  - PointValues
```
protected PointValues()
```
    Default constructor
- Method Detail
  - size
```
public static long size(IndexReader reader,
                        String field)
                 throws IOException
```
    Return the cumulated number of points across all leaves of the given IndexReader. Leaves that do not have points for the given field are ignored.
    
    Throws:
    
    IOException
    
    See Also:
    
    size()
  - getDocCount
```
public static int getDocCount(IndexReader reader,
                              String field)
                       throws IOException
```
    Return the cumulated number of docs that have points across all leaves of the given IndexReader. Leaves that do not have points for the given field are ignored.
    
    Throws:
    
    IOException
    
    See Also:
    
    getDocCount()
  - getMinPackedValue
```
public static byte[] getMinPackedValue(IndexReader reader,
                                       String field)
                                throws IOException
```
    Return the minimum packed values across all leaves of the given IndexReader. Leaves that do not have points for the given field are ignored.
    
    Throws:
    
    IOException
    
    See Also:
    
    getMinPackedValue()
  - getMaxPackedValue
```
public static byte[] getMaxPackedValue(IndexReader reader,
                                       String field)
                                throws IOException
```
    Return the maximum packed values across all leaves of the given IndexReader. Leaves that do not have points for the given field are ignored.
    
    Throws:
    
    IOException
    
    See Also:
    
    getMaxPackedValue()
  - intersect
```
public abstract void intersect(PointValues.IntersectVisitor visitor)
                        throws IOException
```
    Finds all documents and points matching the provided visitor. This method does not enforce live documents, so it's up to the caller to test whether each document is deleted, if necessary.
    
    Throws:
    
    IOException
  - estimatePointCount
```
public abstract long estimatePointCount(PointValues.IntersectVisitor visitor)
```
    Estimate the number of points that would be visited by intersect(org.apache.lucene.index.PointValues.IntersectVisitor) with the given PointValues.IntersectVisitor. This should run many times faster than intersect(IntersectVisitor).
  - estimateDocCount
```
public long estimateDocCount(PointValues.IntersectVisitor visitor)
```
    Estimate the number of documents that would be matched by intersect(org.apache.lucene.index.PointValues.IntersectVisitor) with the given PointValues.IntersectVisitor. This should run many times faster than intersect(IntersectVisitor).
    
    See Also:
    
    DocIdSetIterator.cost()
  - getMinPackedValue
```
public abstract byte[] getMinPackedValue()
                                  throws IOException
```
    Returns minimum value for each dimension, packed, or null if size(org.apache.lucene.index.IndexReader, java.lang.String) is 0
    
    Throws:
    
    IOException
  - getMaxPackedValue
```
public abstract byte[] getMaxPackedValue()
                                  throws IOException
```
    Returns maximum value for each dimension, packed, or null if size(org.apache.lucene.index.IndexReader, java.lang.String) is 0
    
    Throws:
    
    IOException
  - getNumDimensions
```
public abstract int getNumDimensions()
                              throws IOException
```
    Returns how many dimensions are represented in the values
    
    Throws:
    
    IOException
  - getNumIndexDimensions
```
public abstract int getNumIndexDimensions()
                                   throws IOException
```
    Returns how many dimensions are used for the index
    
    Throws:
    
    IOException
  - getBytesPerDimension
```
public abstract int getBytesPerDimension()
                                  throws IOException
```
    Returns the number of bytes per dimension
    
    Throws:
    
    IOException
  - size
```
public abstract long size()
```
    Returns the total number of indexed points across all documents.
  - getDocCount
```
public abstract int getDocCount()
```
    Returns the total number of documents that have indexed at least one point.

Class PointValues

Basic Point Types

Geospatial Point Types

Advanced usage

Nested Class Summary

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

MAX_NUM_BYTES

MAX_DIMENSIONS

MAX_INDEX_DIMENSIONS

Constructor Detail

PointValues

Method Detail

size

getDocCount

getMinPackedValue

getMaxPackedValue

intersect

estimatePointCount

estimateDocCount

getMinPackedValue

getMaxPackedValue

getNumDimensions

getNumIndexDimensions

getBytesPerDimension

size

getDocCount