org.apache.lucene.search

Class DocValuesStats<T>

java.lang.Object

org.apache.lucene.search.DocValuesStats<T>

Direct Known Subclasses:

DocValuesStats.NumericDocValuesStats, DocValuesStats.SortedDocValuesStats, DocValuesStats.SortedNumericDocValuesStats, DocValuesStats.SortedSetDocValuesStats

public abstract class DocValuesStats<T>
extends Object

Holds statistics for a DocValues field.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	DocValuesStats.DoubleDocValuesStats Holds DocValues statistics for a numeric field storing double values.
static class	DocValuesStats.LongDocValuesStats Holds DocValues statistics for a numeric field storing long values.
static class	DocValuesStats.NumericDocValuesStats<T extends Number> Holds statistics for a numeric DocValues field.
static class	DocValuesStats.SortedDocValuesStats Holds statistics for a sorted DocValues field.
static class	DocValuesStats.SortedDoubleDocValuesStats Holds DocValues statistics for a sorted-numeric field storing double values.
static class	DocValuesStats.SortedLongDocValuesStats Holds DocValues statistics for a sorted-numeric field storing long values.
static class	DocValuesStats.SortedNumericDocValuesStats<T extends Number> Holds statistics for a sorted-numeric DocValues field.
static class	DocValuesStats.SortedSetDocValuesStats Holds statistics for a sorted-set DocValues field.

Field Summary

Fields

Modifier and Type	Field and Description
protected String	field
protected T	max
protected T	min

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	DocValuesStats(String field, T initialMin, T initialMax)

Method Summary

Modifier and Type	Method and Description
int	count() The number of documents which have a value of the field.
protected abstract void	doAccumulate(int doc, int count) Called after accumulate(int) was processed and verified that the document has a value for the field.
String	field() The field for which these stats were computed.
protected boolean	init(LeafReaderContext context) Initializes this object with the given reader context.
T	max() The maximum value of the field.
T	min() The minimum value of the field.
int	missing() The number of documents which do not have a value of the field.

Methods inherited from class java.lang.Object

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

Field Detail

field

protected final String field

min

protected T min

max

protected T max

Constructor Detail

DocValuesStats

protected DocValuesStats(String field,
                         T initialMin,
                         T initialMax)

Method Detail

doAccumulate

protected abstract void doAccumulate(int doc,
                                     int count)
                              throws IOException

Called after accumulate(int) was processed and verified that the document has a value for the field. Implementations should update the statistics based on the value of the current document.

Parameters:

doc - the document to read the value of for updating statistics.

count - the updated number of documents with value for this field.

Throws:

IOException

init

protected boolean init(LeafReaderContext context)
                throws IOException

Initializes this object with the given reader context. Returns whether stats can be computed for this segment (i.e. it does have the requested DocValues field).

Throws:

IOException

field

public final String field()

The field for which these stats were computed.

count

public final int count()

The number of documents which have a value of the field.

missing

public final int missing()

The number of documents which do not have a value of the field.

min

public final T min()

The minimum value of the field. Undefined when count() is zero.

max

public final T max()

The maximum value of the field. Undefined when count() is zero.