org.apache.lucene.queries.function.valuesource
Class ScaleFloatFunction
java.lang.Object
org.apache.lucene.queries.function.ValueSource
org.apache.lucene.queries.function.valuesource.ScaleFloatFunction
public class ScaleFloatFunction
- extends ValueSource
Scales values to be between min and max.
This implementation currently traverses all of the source values to obtain
their min and max.
This implementation currently cannot distinguish when documents have been
deleted or documents that have no value, and 0.0 values will be used for
these cases. This means that if values are normally all greater than 0.0, one can
still end up with 0.0 as the min value to map from. In these cases, an
appropriate map() function could be used as a workaround to change 0.0
to a value in the real range.
source
protected final ValueSource source
min
protected final float min
max
protected final float max
ScaleFloatFunction
public ScaleFloatFunction(ValueSource source,
float min,
float max)
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
Copyright © 2000-2013 Apache Software Foundation. All Rights Reserved.