org.algernon.lang.shell
Class GenericUnixShellEvaluator

java.lang.Object
  org.algernon.lang.shell.GenericUnixShellEvaluator

All Implemented Interfaces:

ExternalLanguageEvaluator

public class GenericUnixShellEvaluator

extends Object

implements ExternalLanguageEvaluator

Evaluator for java method calls and expressions. User: hewett Date: Dec 10, 2002 Time: 4:30:06 PM

Constructor Summary

GenericUnixShellEvaluator()

Method Summary

Object	evaluateExpression(LispValue expression, Algernon algy) Makes a call to the UNIX shell.
Boolean	toBoolean(Object any, Algernon algy) This method must return a Java Boolean value for any type of Object returned by the evaluateExpression method.

Methods inherited from class java.lang.Object

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

Constructor Detail

GenericUnixShellEvaluator

public GenericUnixShellEvaluator()

Method Detail

toBoolean

public Boolean toBoolean(Object any,
                         Algernon algy)

This method must return a Java Boolean value for any type of Object returned by the evaluateExpression method. For example, null might correspond to Boolean.False,

Specified by:

toBoolean in interface ExternalLanguageEvaluator

Parameters:

any - any Java Object, including null.

Returns:

a Java Boolean instance.

evaluateExpression

public Object evaluateExpression(LispValue expression,
                                 Algernon algy)

Makes a call to the UNIX shell. If the caller returns 0, that typically indicates success.

   (:TEST (:SHELL "ls -l | myTest"))
 

Specified by:

evaluateExpression in interface ExternalLanguageEvaluator

Parameters:

expression - A valid UNIX command line expression.

Returns:

whatever the call returned, turned into a Java Object.