Java Module java.scripting Package javax.script Interface Invocable（JDK11）

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.