weka.core.scripting
Class Groovy

java.lang.Object
  extended by weka.core.scripting.Groovy
All Implemented Interfaces:
java.io.Serializable, RevisionHandler

public class Groovy
extends java.lang.Object
implements java.io.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: 5953 $
Author:
fracpete (fracpete at waikato dot ac dot nz)
See Also:
Serialized Form

Field Summary
static java.lang.String CLASS_GROOVYCLASSLOADER
          the classname of the Groovy classloader.
 
Constructor Summary
Groovy()
          default constructor, tries to instantiate a Groovy classloader.
 
Method Summary
 java.lang.Object getClassLoader()
          returns the currently used Groovy classloader.
 java.lang.String getRevision()
          Returns the revision string.
static java.lang.Object invoke(java.lang.Object o, java.lang.String methodName, java.lang.Class[] paramClasses, java.lang.Object[] paramValues)
          executes the specified method and returns the result, if any.
 java.lang.Object invoke(java.lang.String methodName, java.lang.Class[] paramClasses, java.lang.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(java.lang.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 java.lang.Object newClassLoader()
          initializes and returns a Groovy Interpreter.
static java.lang.Object newInstance(java.io.File file, java.lang.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 java.lang.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 java.lang.Object getClassLoader()
returns the currently used Groovy classloader.

Returns:
the classloader, can be null

invoke

public java.lang.Object invoke(java.lang.String methodName,
                               java.lang.Class[] paramClasses,
                               java.lang.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 java.lang.Object newClassLoader()
initializes and returns a Groovy Interpreter.

Returns:
the interpreter or null if Groovy classes not present

newInstance

public static java.lang.Object newInstance(java.io.File file,
                                           java.lang.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 java.lang.Object invoke(java.lang.Object o,
                                      java.lang.String methodName,
                                      java.lang.Class[] paramClasses,
                                      java.lang.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 java.lang.String getRevision()
Returns the revision string.

Specified by:
getRevision in interface RevisionHandler
Returns:
the revision

main

public static void main(java.lang.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