Package 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 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 Details

    • 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.