com.pervasive.datarush.aggregations

Class AggregationRegistry

java.lang.Object

com.pervasive.datarush.aggregations.AggregationRegistry

public class AggregationRegistry
extends Object

Stores a list of aggregations registered by the AggregationProvider, and provides a method for calling those aggregations.

Method Summary

Modifier and Type	Method and Description
Aggregation	getAggregation(String name, ScalarValuedFunction[] arguments) Invoke an Aggregation by name, using the supplied arguments.
FunctionDescription	getFunctionDescription(String name, int argCount) Create a FunctionDescription for a given aggregation.
Collection<FunctionDescription>	getFunctionDescriptions() Return a list of descriptions of all available aggregations.
Map<String,Collection<FunctionDescription>>	getFunctionDescriptionsByCategory() Returns a list of descriptions of all available aggregations, organized by category.
static AggregationRegistry	getInstance() Get an instance of the AggregationRegistry.

Methods inherited from class java.lang.Object

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

Method Detail

getInstance

public static AggregationRegistry getInstance()

Get an instance of the AggregationRegistry.

Returns:

An instance of the AggregationRegistry

getAggregation

public Aggregation getAggregation(String name,
                                  ScalarValuedFunction[] arguments)

Invoke an Aggregation by name, using the supplied arguments.

Parameters:

name - The registered name of the aggregation.

arguments - The arguments to pass to the aggregation.

Returns:

The Aggregation.

getFunctionDescriptions

public Collection<FunctionDescription> getFunctionDescriptions()

Return a list of descriptions of all available aggregations.

Returns:

getFunctionDescriptionsByCategory

public Map<String,Collection<FunctionDescription>> getFunctionDescriptionsByCategory()

Returns a list of descriptions of all available aggregations, organized by category.

Returns:

getFunctionDescription

public FunctionDescription getFunctionDescription(String name,
                                                  int argCount)

Create a FunctionDescription for a given aggregation.

Parameters:

name - The name of the aggregation

argCount - The number of arguments the aggregation takes

Returns:

The FunctionDescription of the aggregation