weka.core.scripting

Class Groovy

java.lang.Object

weka.core.scripting.Groovy

All Implemented Interfaces:

Serializable, RevisionHandler

public class Groovy
extends Object
implements Serializable, RevisionHandler

A helper class for Groovy.

In order to use Groovy, the jar containing all the classes must be present in the CLASSPATH. This jar is normally found in the embeddable sub-directory of the Groovy installation.

Tested with Groovy 1.5.7.

Version:

$Revision: 13695 $

Author:

fracpete (fracpete at waikato dot ac dot nz)

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static String	CLASS_GROOVYCLASSLOADER the classname of the Groovy classloader.

Constructor Summary

Constructors

Constructor and Description
Groovy() default constructor, tries to instantiate a Groovy classloader.

Method Summary

Modifier and Type	Method and Description
Object	getClassLoader() returns the currently used Groovy classloader.
String	getRevision() Returns the revision string.
static Object	invoke(Object o, String methodName, Class<?>[] paramClasses, Object[] paramValues) executes the specified method and returns the result, if any.
Object	invoke(String methodName, Class<?>[] paramClasses, Object[] paramValues) executes the specified method on the current interpreter and returns the result, if any.
static boolean	isPresent() returns whether the Groovy classes are present or not, i.e.
static void	main(String[] args) If no arguments are given, it just prints the presence of the Groovy classes, otherwise it expects a Groovy filename to execute.
static Object	newClassLoader() initializes and returns a Groovy Interpreter.
static Object	newInstance(File file, Class<?> template) loads the module and returns a new instance of it as instance of the provided Java class template.

Methods inherited from class java.lang.Object

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

Field Detail

CLASS_GROOVYCLASSLOADER

public static final String CLASS_GROOVYCLASSLOADER

the classname of the Groovy classloader.

See Also:

Constant Field Values

Constructor Detail

Groovy

public Groovy()

default constructor, tries to instantiate a Groovy classloader.

Method Detail

getClassLoader

public Object getClassLoader()

returns the currently used Groovy classloader.

Returns:

the classloader, can be null

invoke

public Object invoke(String methodName,
                     Class<?>[] paramClasses,
                     Object[] paramValues)

executes the specified method on the current interpreter and returns the result, if any.

Parameters:

methodName - the name of the method

paramClasses - the classes of the parameters

paramValues - the values of the parameters

Returns:

the return value of the method, if any (in that case null)

isPresent

public static boolean isPresent()

returns whether the Groovy classes are present or not, i.e. whether the classes are in the classpath or not

Returns:

whether the Groovy classes are available

newClassLoader

public static Object newClassLoader()

initializes and returns a Groovy Interpreter.

Returns:

the interpreter or null if Groovy classes not present

newInstance

public static Object newInstance(File file,
                                 Class<?> template)

loads the module and returns a new instance of it as instance of the provided Java class template.

Parameters:

file - the Groovy module file

template - the template for the returned Java object

Returns:

the Groovy object

invoke

public static Object invoke(Object o,
                            String methodName,
                            Class<?>[] paramClasses,
                            Object[] paramValues)

executes the specified method and returns the result, if any.

Parameters:

o - the object the method should be called from, e.g., a Groovy Interpreter

methodName - the name of the method

paramClasses - the classes of the parameters

paramValues - the values of the parameters

Returns:

the return value of the method, if any (in that case null)

getRevision

public String getRevision()

Returns the revision string.

Specified by:

getRevision in interface RevisionHandler

Returns:

the revision

main

public static void main(String[] args)

If no arguments are given, it just prints the presence of the Groovy classes, otherwise it expects a Groovy filename to execute.

Parameters:

args - commandline arguments