FunctionRegistry (Dataflow Library Distribution Project 8.0.0-98 API)

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

All Methods Static Methods Instance Methods Concrete Methods
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 Detail
  - 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