org.apache.solr.search.function.distance
Class VectorDistanceFunction

java.lang.Object
  extended by org.apache.lucene.queries.function.ValueSource
      extended by org.apache.solr.search.function.distance.VectorDistanceFunction
Direct Known Subclasses:
SquaredEuclideanFunction

public class VectorDistanceFunction
extends ValueSource

Calculate the p-norm for a Vector. See http://en.wikipedia.org/wiki/Lp_space

Common cases:

See Also:
for the special case

Field Summary
protected  float oneOverPower
           
protected  float power
           
protected  MultiValueSource source1
           
protected  MultiValueSource source2
           
 
Constructor Summary
VectorDistanceFunction(float power, MultiValueSource source1, MultiValueSource source2)
           
 
Method Summary
 void createWeight(Map context, IndexSearcher searcher)
           
 String description()
           
protected  double distance(int doc, FunctionValues dv1, FunctionValues dv2)
          Calculate the distance
 boolean equals(Object o)
           
 FunctionValues getValues(Map context, AtomicReaderContext readerContext)
           
 int hashCode()
           
protected  String name()
           
 
Methods inherited from class org.apache.lucene.queries.function.ValueSource
getSortField, newContext, toString
 
Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
 

Field Detail

source1

protected MultiValueSource source1

source2

protected MultiValueSource source2

power

protected float power

oneOverPower

protected float oneOverPower
Constructor Detail

VectorDistanceFunction

public VectorDistanceFunction(float power,
                              MultiValueSource source1,
                              MultiValueSource source2)
Method Detail

name

protected String name()

distance

protected double distance(int doc,
                          FunctionValues dv1,
                          FunctionValues dv2)
Calculate the distance

Parameters:
doc - The current doc
dv1 - The values from the first MultiValueSource
dv2 - The values from the second MultiValueSource
Returns:
The distance

getValues

public FunctionValues getValues(Map context,
                                AtomicReaderContext readerContext)
                         throws IOException
Specified by:
getValues in class ValueSource
Throws:
IOException

createWeight

public void createWeight(Map context,
                         IndexSearcher searcher)
                  throws IOException
Overrides:
createWeight in class ValueSource
Throws:
IOException

equals

public boolean equals(Object o)
Specified by:
equals in class ValueSource

hashCode

public int hashCode()
Specified by:
hashCode in class ValueSource

description

public String description()
Specified by:
description in class ValueSource


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