com.pdmfc.tea.runtime
Class SLambdaFunction

java.lang.Object
  com.pdmfc.tea.runtime.SLambdaFunction

All Implemented Interfaces:

SObjFunction

public class SLambdaFunction
extends java.lang.Object
implements SObjFunction

A function defined inside a Tea program. A function is defined by a list of symbols and a code block. The list of symbols represent its formal parameters. The code block is the function body that is executed when the function is invoked.

The block is executed in a new context. This new context is an imediate descendent of the context where the block was created. Before the block is actually executed, variables named after the formal parameters are created and initialized with the values with which the command was invoked. The return value of the function is the return value of the last statement of the block.

Constructor Summary

SLambdaFunction(SObjSymbol[] argNames, SObjBlock body)
Initializes the new object.

Method Summary

java.lang.Object

exec(SObjFunction func, SContext context, java.lang.Object[] args) Executes the Tea function.

Methods inherited from class java.lang.Object

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

Constructor Detail

SLambdaFunction

public SLambdaFunction(SObjSymbol[] argNames,
                       SObjBlock body)

Initializes the new object.

Parameters:

argNames - List of symbols representing the formal parameters.

body - Block of code, representing the body of the command.

Method Detail

exec

public java.lang.Object exec(SObjFunction func,
                             SContext context,
                             java.lang.Object[] args)
                      throws STeaException

Executes the Tea function. A new context is created, descending from the context where the block was created. Local variables, named after the formal command parameters are initialized with the values received as arguments. This method is supposed to be called with args having at least one element.

Specified by:

exec in interface SObjFunction

Parameters:

context - The context where this command is being invoked.

args - Array with the arguments passed to the command.

func - The SObjFunction that led to call this function. Most of the time is the same as the this object.

Returns:

An Object object.

Throws:

STeaException - Thrown if the number of arguments does not match or if there were any problems executing the function body.