Class DecayFunctionParser<DFB extends DecayFunctionBuilder<DFB>>
- All Implemented Interfaces:
ScoreFunctionParser<DFB>
{
"fieldname1" : {
"origin" = "someValue",
"scale" = "someValue"
},
"multi_value_mode" : "min"
}
"origin" here refers to the reference point and "scale" to the level of
uncertainty you have in your origin.
For example, you might want to retrieve an event that took place around the 20 May 2010 somewhere near Berlin. You are mainly interested in events that are close to the 20 May 2010 but you are unsure about your guess, maybe it was a week before or after that. Your "origin" for the date field would be "20 May 2010" and your "scale" would be "7d".
This class parses the input and creates a scoring function from the parameters origin and scale.
To write a new decay scoring function, create a new class that extends
DecayFunctionBuilder
, setup a PARSER field with this class, and
register them in SearchModule.registerScoreFunctions(java.util.List<org.elasticsearch.plugins.SearchPlugin>)
or SearchPlugin.getScoreFunctions()
See GaussDecayFunctionBuilder.PARSER
for an example.
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Field Summary
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Constructor Summary
ConstructorDescriptionDecayFunctionParser
(BiFunction<String, BytesReference, DFB> createFromBytes) Create the parser using a method reference to a "create from bytes" constructor for the DecayFunctionBuilder. -
Method Summary
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Field Details
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MULTI_VALUE_MODE
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Constructor Details
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DecayFunctionParser
Create the parser using a method reference to a "create from bytes" constructor for the DecayFunctionBuilder. We use a method reference here so each use of this class doesn't have to subclass it.
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Method Details
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fromXContent
Parses bodies of the kind{ "fieldname1" : { "origin" : "someValue", "scale" : "someValue" }, "multi_value_mode" : "min" }
- Specified by:
fromXContent
in interfaceScoreFunctionParser<DFB extends DecayFunctionBuilder<DFB>>
- Throws:
IOException
ParsingException
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