net.christopherschultz.evaluator.function
Class IJWInvocation

java.lang.Object
  net.christopherschultz.evaluator.StandardFunction
      net.christopherschultz.evaluator.function.IJWInvocation

All Implemented Interfaces:

Function

Direct Known Subclasses:

CallFunction

public class IJWInvocation
extends StandardFunction

Calls a method matching the function's name on the first argument, passing the remaining function arguments as arguments to the object method.

The .NET framework calls this "It Just Works", or IJW, which is where I took this name.

Here's an example of how this works. If you expression is

substring("hello world", 1, 4)

Then by using an IJWInvocation function call, the "hello world" String object will be used to call the "substring" method with the remaining arguments (1 and 4).

Version:

$Revision: 1.5 $ $Date: 2008-06-20 22:58:48 $

Author:

Chris Schultz

Constructor Summary

IJWInvocation()
Creates a new IJWInvocation object.

Method Summary

Object

call(EvaluationContext ec, String functionName, Object[] arguments) Calls this function with standard argument evaluation semantics.

Methods inherited from class net.christopherschultz.evaluator.StandardFunction

call, getExpressionValue, getExpressionValueArray, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

IJWInvocation

public IJWInvocation()

Creates a new IJWInvocation object.

Method Detail

call

public Object call(EvaluationContext ec,
                   String functionName,
                   Object[] arguments)
            throws EvaluationException

Description copied from class: StandardFunction

Calls this function with standard argument evaluation semantics.

Specified by:

call in class StandardFunction

Parameters:

ec - The EvaluationContext in which this function is being called.

functionName - The name of the function being invoked.

arguments - The argument values to pass to this function.

Returns:

The result of the function.

Throws:

EvaluationException - If there is an error during function execution.