com.hammurapi.extract

Class CompositeExtractorBase<T,V,C>

java.lang.Object

com.hammurapi.extract.ExtractorBase<T,V,C>

com.hammurapi.extract.CompositeExtractorBase<T,V,C>

Type Parameters:

T -

V -

All Implemented Interfaces:

Extractor<T,V,C>

public abstract class CompositeExtractorBase<T,V,C>
extends ExtractorBase<T,V,C>

Base class for composite extractors like +, *, / operations.

Field Summary

Fields

Modifier and Type	Field and Description
protected Extractor<T,V,C>[]	operands

Fields inherited from class com.hammurapi.extract.ExtractorBase

cost, costUnit, initialCost, invocations, nanos, totalCost

Constructor Summary

Constructors

Constructor and Description
CompositeExtractorBase(double initialCost, TimeUnit costUnit, Extractor<T,V,C>... operands)

Method Summary

Methods

Modifier and Type	Method and Description
double	getCost()

Methods inherited from class com.hammurapi.extract.ExtractorBase

compareTo, createCacheEntry, equals, extract, extractInternal

Methods inherited from class java.lang.Object

clone, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface com.hammurapi.extract.Extractor

isContextDependent, parameterIndices

Field Detail

operands

protected Extractor<T,V,C>[] operands

Constructor Detail

CompositeExtractorBase

public CompositeExtractorBase(double initialCost,
                      TimeUnit costUnit,
                      Extractor<T,V,C>... operands)

Method Detail

getCost

public double getCost()

Specified by:

getCost in interface Extractor<T,V,C>

Overrides:

getCost in class ExtractorBase<T,V,C>

Returns:

Extractor evaluation cost. Cost is used for optimization of computation intensive algorithms. E.g. in Store it is used for selection of indices for query operations.