Java™ Platform
Standard Ed. 6

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
<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 occurrs 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:
args - Arguments to pass to the procedure or function
Returns:
The value returned by the procedure or function
Throws:
ScriptException - if an error occurrs 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.

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.

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.

Java™ Platform
Standard Ed. 6

Submit a bug or feature
For further API reference and developer documentation, see Java SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

Copyright 2008 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.


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