Module datarush.library

Package com.pervasive.datarush.functions

Class FunctionRegistry

java.lang.Object

com.pervasive.datarush.functions.FunctionRegistry

public class FunctionRegistry
extends Object

Stores a list of functions registered by the FunctionTypeResoultionProvider, and provides a method for calling those functions.

Method Summary

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

Methods inherited from class java.lang.Object

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

Method Details

getInstance

public static FunctionRegistry getInstance()

Get an instance of the FunctionRegistry.

Returns:

An instance of the FunctionRegistry

getFunction

public ScalarValuedFunction getFunction(String name,
 ScalarValuedFunction[] arguments)

Invoke a ScalarValuedFunction by name, using the supplied arguments.

Parameters:

name - The registered name of the function.

arguments - The arguments to pass to the function.

Returns:

The ScalarValuedFunction.

getFunctionDescriptions

public Collection<FunctionDescription> getFunctionDescriptions()

Return a list of descriptions of all available functions.

Returns:

getFunctionDescriptionsByCategory

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

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

Returns:

getFunctionDescription

public FunctionDescription getFunctionDescription(String name,
 int argCount)

Create a FunctionDescription for a given function.

Parameters:

name - The name of the function

argCount - The number of arguments the function takes

Returns:

The FunctionDescription of the function