Function (zk 10.0.0 API)

All Known Implementing Classes:

MethodFunction
```
public interface Function
```
Represents a XEL function.

Since:

3.0.0

Author:

tomyeh

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`java.lang.Class<?>[]`	`getParameterTypes()`	Returns an array of Class objects that represent the formal parameter types, in declaration order, of the method represented by this Method object.
`java.lang.Class<?>`	`getReturnType()`	Returns a Class object that represents the formal return type of the method represented by this Method object.
`java.lang.Object`	`invoke(java.lang.Object obj, java.lang.Object... args)`	Invokes this method with the specified arguments.
`java.lang.reflect.Method`	`toMethod()`	Converts this function to a method, or null if unable to convert.

- Method Detail
  - getParameterTypes
```
java.lang.Class<?>[] getParameterTypes()
```
    Returns an array of Class objects that represent the formal parameter types, in declaration order, of the method represented by this Method object.
    Returns an array of length 0 if the underlying method takes no parameters.
  - getReturnType
```
java.lang.Class<?> getReturnType()
```
    Returns a Class object that represents the formal return type of the method represented by this Method object.
  - invoke
```
java.lang.Object invoke(java.lang.Object obj,
                        java.lang.Object... args)
                 throws java.lang.Exception
```
    Invokes this method with the specified arguments.
    
    Parameters:
    
    obj - the object the underlying method is invoked from. It is always null if this function is invoked in an XEL expression. It is reserved for more sophisticated expressions, such as ZK Spreadsheet's expressions.
    
    args - the arguments used for the method call. If null, an Object array with zero length is assumed.
    
    Throws:
    
    java.lang.Exception
  - toMethod
```
java.lang.reflect.Method toMethod()
```
    Converts this function to a method, or null if unable to convert.