Package weka.core.scripting

Class 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: 13695 $
    Author:
    fracpete (fracpete at waikato dot ac dot nz)
    See Also:
    Serialized Form

    • Field Summary

      Fields 
      Modifier and Type Field Description
      static java.lang.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

      All Methods Static Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      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