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

Methods

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.