Package weka.core.scripting

Class 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:
    $Revision$
    Author:
    fracpete (fracpete at waikato dot ac dot nz)
    See Also:
    Serialized Form

    • 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)

      • 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