org.apache.lucene.queries.function.valuesource
Class MultiFloatFunction

java.lang.Object
  extended by org.apache.lucene.queries.function.ValueSource
      extended by org.apache.lucene.queries.function.valuesource.MultiFloatFunction
Direct Known Subclasses:
MaxFloatFunction, MinFloatFunction, ProductFloatFunction, SumFloatFunction

public abstract class MultiFloatFunction
extends ValueSource

Abstract ValueSource implementation which wraps multiple ValueSources and applies an extendible float function to their values.


Field Summary
protected  ValueSource[] sources
           
 
Constructor Summary
MultiFloatFunction(ValueSource[] sources)
           
 
Method Summary
 void createWeight(Map context, IndexSearcher searcher)
          Implementations should propagate createWeight to sub-ValueSources which can optionally store weight info in the context.
 String description()
          description of field, used in explain()
 boolean equals(Object o)
           
protected abstract  float func(int doc, FunctionValues[] valsArr)
           
 FunctionValues getValues(Map context, AtomicReaderContext readerContext)
          Gets the values for this reader and the context that was previously passed to createWeight()
 int hashCode()
           
protected abstract  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

sources

protected final ValueSource[] sources
Constructor Detail

MultiFloatFunction

public MultiFloatFunction(ValueSource[] sources)
Method Detail

name

protected abstract String name()

func

protected abstract float func(int doc,
                              FunctionValues[] valsArr)

description

public String description()
Description copied from class: ValueSource
description of field, used in explain()

Specified by:
description in class ValueSource

getValues

public FunctionValues getValues(Map context,
                                AtomicReaderContext readerContext)
                         throws IOException
Description copied from class: ValueSource
Gets the values for this reader and the context that was previously passed to createWeight()

Specified by:
getValues in class ValueSource
Throws:
IOException

createWeight

public void createWeight(Map context,
                         IndexSearcher searcher)
                  throws IOException
Description copied from class: ValueSource
Implementations should propagate createWeight to sub-ValueSources which can optionally store weight info in the context. The context object will be passed to getValues() where this info can be retrieved.

Overrides:
createWeight in class ValueSource
Throws:
IOException

hashCode

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

equals

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


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