javax.script

Interface Invocable


  • public interface Invocable
    The optional interface implemented by ScriptEngines whose methods allow the invocation of procedures in scripts that have previously been executed.
    Since:
    1.6

    • Method Summary

      Modifier and Type Method and Description
      <T> T getInterface(Class<T> clasz)
      Returns an implementation of an interface using functions compiled in the interpreter.
      <T> T getInterface(Object thiz, Class<T> clasz)
      Returns an implementation of an interface using member functions of a scripting object compiled in the interpreter.
      Object invokeFunction(String name, Object... args)
      Used to call top-level procedures and functions defined in scripts.
      Object invokeMethod(Object thiz, String name, Object... args)
      Calls a method on a script object compiled during a previous script execution, which is retained in the state of the ScriptEngine.

    • Method Detail

      • invokeMethod

        Object invokeMethod(Object thiz,
                    String name,
                    Object... args)
             throws ScriptException,
                    NoSuchMethodException
        Calls a method on a script object compiled during a previous script execution, which is retained in the state of the ScriptEngine.
        Parameters:
        name - The name of the procedure to be called.
        thiz - If the procedure is a member of a class defined in the script and thiz is an instance of that class returned by a previous execution or invocation, the named method is called through that instance.
        args - Arguments to pass to the procedure. The rules for converting the arguments to scripting variables are implementation-specific.
        Returns:
        The value returned by the procedure. The rules for converting the scripting variable returned by the script method to a Java Object are implementation-specific.
        Throws:
        ScriptException - if an error occurs during invocation of the method.
        NoSuchMethodException - if method with given name or matching argument types cannot be found.
        NullPointerException - if the method name is null.
        IllegalArgumentException - if the specified thiz is null or the specified Object is does not represent a scripting object.

      • invokeFunction

        Object invokeFunction(String name,
                      Object... args)
               throws ScriptException,
                      NoSuchMethodException
        Used to call top-level procedures and functions defined in scripts.
        Parameters:
        name - of the procedure or function to call
        args - Arguments to pass to the procedure or function
        Returns:
        The value returned by the procedure or function
        Throws:
        ScriptException - if an error occurs during invocation of the method.
        NoSuchMethodException - if method with given name or matching argument types cannot be found.
        NullPointerException - if method name is null.

      • getInterface

        <T> T getInterface(Class<T> clasz)
        Returns an implementation of an interface using functions compiled in the interpreter. The methods of the interface may be implemented using the invokeFunction method.
        Type Parameters:
        T - the type of the interface to return
        Parameters:
        clasz - The Class object of the interface to return.
        Returns:
        An instance of requested interface - null if the requested interface is unavailable, i. e. if compiled functions in the ScriptEngine cannot be found matching the ones in the requested interface.
        Throws:
        IllegalArgumentException - if the specified Class object is null or is not an interface.

      • getInterface

        <T> T getInterface(Object thiz,
                   Class<T> clasz)
        Returns an implementation of an interface using member functions of a scripting object compiled in the interpreter. The methods of the interface may be implemented using the invokeMethod method.
        Type Parameters:
        T - the type of the interface to return
        Parameters:
        thiz - The scripting object whose member functions are used to implement the methods of the interface.
        clasz - The Class object of the interface to return.
        Returns:
        An instance of requested interface - null if the requested interface is unavailable, i. e. if compiled methods in the ScriptEngine cannot be found matching the ones in the requested interface.
        Throws:
        IllegalArgumentException - if the specified Class object is null or is not an interface, or if the specified Object is null or does not represent a scripting object.