org.zkoss.xel

Interface Function

All Known Implementing Classes:

MethodFunction

public interface Function

Represents a XEL function.

Since:

3.0.0

Author:

tomyeh

Method Summary

Modifier and Type	Method and Description
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.
Class<?>	getReturnType() Returns a Class object that represents the formal return type of the method represented by this Method object.
Object	invoke(Object obj, Object... args) Invokes this method with the specified arguments.
Method	toMethod() Converts this function to a method, or null if unable to convert.

Method Detail

getParameterTypes

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

Class<?> getReturnType()

Returns a Class object that represents the formal return type of the method represented by this Method object.

invoke

Object invoke(Object obj,
              Object... args)
       throws 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:

Exception

toMethod

Method toMethod()

Converts this function to a method, or null if unable to convert.