Package org.apache.solr.analytics.function.field

Class AnalyticsField

java.lang.Object

org.apache.solr.analytics.function.field.AnalyticsField

All Implemented Interfaces:

AnalyticsValueStream

Direct Known Subclasses:

BooleanField, BooleanMultiField, DateField, DoubleField, DoubleMultiPointField, DoubleMultiTrieField, FloatField, FloatMultiPointField, FloatMultiTrieField, IntField, IntMultiPointField, IntMultiTrieField, LongField, LongMultiPointField, LongMultiTrieField, StringField, StringMultiField

public abstract class AnalyticsField
extends Object
implements AnalyticsValueStream

An analytics wrapper for Solr Fields.

Currently only fields with Doc Values enabled can be used in Analytics queries.

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.solr.analytics.value.AnalyticsValueStream

AnalyticsValueStream.AbstractAnalyticsValueStream, AnalyticsValueStream.ExpressionType

Field Summary

Fields

Modifier and Type	Field	Description
protected String	fieldName
protected static int	initialArrayLength

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	AnalyticsField(String fieldName)

Method Summary

Modifier and Type	Method	Description
abstract void	collect(int doc)	Collect the value(s) of the wrapped field for the given document, and store the value.
AnalyticsValueStream	convertToConstant()	Converts this value to a ConstantValue if it's expression type is AnalyticsValueStream.ExpressionType.CONST.
abstract void	doSetNextReader(org.apache.lucene.index.LeafReaderContext context)	Set the segment reader context
String	getExpressionStr()	Get the expression string of the analytics value stream.
AnalyticsValueStream.ExpressionType	getExpressionType()	Get the type of the expression that this class represents.
String	getName()	Get the name of function or value.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.solr.analytics.value.AnalyticsValueStream

streamObjects

Field Detail

initialArrayLength

protected static final int initialArrayLength

See Also:

Constant Field Values

fieldName

protected final String fieldName

Constructor Detail

AnalyticsField

protected AnalyticsField(String fieldName)

Method Detail

getExpressionStr

public String getExpressionStr()

Description copied from interface: AnalyticsValueStream

Get the expression string of the analytics value stream. Must be unique to the expression. If passed to ExpressionFactory.createExpression(String), the exact same expression should be created.

Specified by:

getExpressionStr in interface AnalyticsValueStream

Returns:

the name of function/value

getName

public String getName()

Description copied from interface: AnalyticsValueStream

Get the name of function or value.

Specified by:

getName in interface AnalyticsValueStream

Returns:

the name of function/value

getExpressionType

public AnalyticsValueStream.ExpressionType getExpressionType()

Description copied from interface: AnalyticsValueStream

Get the type of the expression that this class represents.

Specified by:

getExpressionType in interface AnalyticsValueStream

Returns:

the expression type

convertToConstant

public AnalyticsValueStream convertToConstant()

Description copied from interface: AnalyticsValueStream

Converts this value to a ConstantValue if it's expression type is AnalyticsValueStream.ExpressionType.CONST.

If the value is reduced then no conversion will occur and the value itself will be returned.

Specified by:

convertToConstant in interface AnalyticsValueStream

Returns:

a constant representation of this value

doSetNextReader

public abstract void doSetNextReader(org.apache.lucene.index.LeafReaderContext context)
                              throws IOException

Set the segment reader context

Parameters:

context - segment context

Throws:

IOException - if an error occurs while loading the leaf reader

collect

public abstract void collect(int doc)
                      throws IOException

Collect the value(s) of the wrapped field for the given document, and store the value.

Parameters:

doc - ID of the document to collect

Throws:

IOException - if an error occurs while reading the document.