Package 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: 13692 $
Author:
fracpete (fracpete at waikato dot ac dot nz)
See Also:

  • Field Summary

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

  • Constructor Summary

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

  • Method Summary

    Modifier and Type
    Method
    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 Details

    • CLASS_GROOVYCLASSLOADER

      public static final String CLASS_GROOVYCLASSLOADER
      the classname of the Groovy classloader.
      See Also:

  • Constructor Details

    • Groovy

      public Groovy()
      default constructor, tries to instantiate a Groovy classloader.

  • Method Details

    • 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