Class SingleFunction
- java.lang.Object
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- org.apache.lucene.queries.function.ValueSource
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- org.apache.lucene.queries.function.valuesource.SingleFunction
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- Direct Known Subclasses:
SimpleFloatFunction
public abstract class SingleFunction extends ValueSource
A function with a single argument
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Field Summary
Fields Modifier and Type Field Description protected ValueSourcesource
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Constructor Summary
Constructors Constructor Description SingleFunction(ValueSource source)
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Method Summary
All Methods Instance Methods Abstract Methods Concrete Methods Modifier and Type Method Description voidcreateWeight(Map<Object,Object> context, IndexSearcher searcher)Implementations should propagate createWeight to sub-ValueSources which can optionally store weight info in the context.Stringdescription()description of field, used in explain()booleanequals(Object o)inthashCode()protected abstract Stringname()-
Methods inherited from class org.apache.lucene.queries.function.ValueSource
asDoubleValuesSource, asLongValuesSource, fromDoubleValuesSource, getSortField, getValues, newContext, toString
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Field Detail
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source
protected final ValueSource source
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Constructor Detail
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SingleFunction
public SingleFunction(ValueSource source)
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Method Detail
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name
protected abstract String name()
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description
public String description()
Description copied from class:ValueSourcedescription of field, used in explain()- Specified by:
descriptionin classValueSource
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hashCode
public int hashCode()
- Specified by:
hashCodein classValueSource
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equals
public boolean equals(Object o)
- Specified by:
equalsin classValueSource
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createWeight
public void createWeight(Map<Object,Object> context, IndexSearcher searcher) throws IOException
Description copied from class:ValueSourceImplementations 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:
createWeightin classValueSource- Throws:
IOException
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