com.pervasive.datarush.functions

Class ReflectiveFactory

java.lang.Object

com.pervasive.datarush.functions.ReflectiveFactory

All Implemented Interfaces:

EvaluatorFactory

public class ReflectiveFactory
extends Object
implements EvaluatorFactory

A factory creating a fixed class of function evaluator. Construction is done via reflection. To be usable with this factory, the evaluator class must:

• Define a single constructor.
• Take a ScalarSettable or subclass object as the first argument as the result buffer.
• Take the function arguments in the order they were declared in the function description. (ScalarFunctionDescriptor. Varargs are supported with either an array (or vararg) or list as the last argument.

Constructor Summary

Constructors

Constructor and Description
ReflectiveFactory(Class<? extends FunctionEvaluator> clazz) Defines a factory creating evaluators of the specified class.

Method Summary

Methods

Modifier and Type	Method and Description
FunctionEvaluator	contructEvaluator(ScalarSettable result, Object[] arguments) Construct a new evaluator for the associated function with the given arguments, bound to the specified output buffer.

Methods inherited from class java.lang.Object

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

Constructor Detail

ReflectiveFactory

public ReflectiveFactory(Class<? extends FunctionEvaluator> clazz)

Defines a factory creating evaluators of the specified class.

Parameters:

evaluator - the class of the evaluator to create

Method Detail

contructEvaluator

public FunctionEvaluator contructEvaluator(ScalarSettable result,
                                  Object[] arguments)

Description copied from interface: EvaluatorFactory

Construct a new evaluator for the associated function with the given arguments, bound to the specified output buffer.

Specified by:

contructEvaluator in interface EvaluatorFactory

Parameters:

result - the buffer to which the function result is written

arguments - the arguments to the function

Returns:

a new evaluator for the function