FunctionInvoker (Pinot Common 0.12.1 API)

java.lang.Object
- org.apache.pinot.common.function.FunctionInvoker

```
public class FunctionInvoker
extends Object
```
The FunctionInvoker is a wrapper on a java method which supports arguments type conversion and method invocation via reflection.

Constructor Summary

Constructors
Constructor Description

FunctionInvoker(FunctionInfo functionInfo)

Method Summary

Modifier and Type	Method	Description
`void`	`convertTypes(Object[] arguments)`	Converts the type of the given arguments to match the parameter classes.
`Method`	`getMethod()`	Returns the underlying java method.
`Class<?>[]`	`getParameterClasses()`	Returns the class of the parameters.
`PinotDataType[]`	`getParameterTypes()`	Returns the PinotDataType of the parameters for type conversion purpose.
`Class<?>`	`getResultClass()`	Returns the class of the result value.
`Object`	`invoke(Object[] arguments)`	Invoke the function with the given arguments.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - FunctionInvoker
```
public FunctionInvoker(FunctionInfo functionInfo)
```
- Method Detail
  - getMethod
```
public Method getMethod()
```
    Returns the underlying java method.
  - getParameterClasses
```
public Class<?>[] getParameterClasses()
```
    Returns the class of the parameters.
  - getParameterTypes
```
public PinotDataType[] getParameterTypes()
```
    Returns the PinotDataType of the parameters for type conversion purpose. Puts null for the parameter class that does not support type conversion.
  - convertTypes
```
public void convertTypes(Object[] arguments)
```
    Converts the type of the given arguments to match the parameter classes. Leaves the argument as is if type conversion is not needed or supported.
  - getResultClass
```
public Class<?> getResultClass()
```
    Returns the class of the result value.
  - invoke
```
public Object invoke(Object[] arguments)
```
    Invoke the function with the given arguments. The arguments should match the parameter classes. Use convertTypes(Object[]) to convert the argument types if needed before calling this method.