/*

 * Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 */

package javax.script;

/**

 * The optional interface implemented by ScriptEngines whose methods allow the invocation of

 * procedures in scripts that have previously been executed.

 *

 * @author  Mike Grogan

 * @author  A. Sundararajan

 * @since 1.6

 */

public interface Invocable  {

    /**

     * Calls a method on a script object compiled during a previous script execution,

     * which is retained in the state of the <code>ScriptEngine</code>.

     *

     * @param name The name of the procedure to be called.

     *

     * @param 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.

     *

     * @param args Arguments to pass to the procedure.  The rules for converting

     * the arguments to scripting variables are implementation-specific.

     *

     * @return 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.

     * @throws NoSuchMethodException if method with given name or matching argument types cannot be found.

     * @throws NullPointerException if the method name is null.

     * @throws IllegalArgumentException if the specified thiz is null or the specified Object is

     * does not represent a scripting object.

     */

    public Object invokeMethod(Object thiz, String name, Object... args)

        throws ScriptException, NoSuchMethodException;

    /**

     * Used to call top-level procedures and functions defined in scripts.

     *

     * @param name of the procedure or function to call

     * @param args Arguments to pass to the procedure or function

     * @return The value returned by the procedure or function

     *

     * @throws ScriptException if an error occurs during invocation of the method.

     * @throws NoSuchMethodException if method with given name or matching argument types cannot be found.

     * @throws NullPointerException if method name is null.

     */

     public Object invokeFunction(String name, Object... args)

        throws ScriptException, NoSuchMethodException;

     /**

     * Returns an implementation of an interface using functions compiled in

     * the interpreter. The methods of the interface

     * may be implemented using the <code>invokeFunction</code> method.

     *

     * @param <T> the type of the interface to return

     * @param clasz The <code>Class</code> object of the interface to return.

     *

     * @return An instance of requested interface - null if the requested interface is unavailable,

     * i. e. if compiled functions in the <code>ScriptEngine</code> cannot be found matching

     * the ones in the requested interface.

     *

     * @throws IllegalArgumentException if the specified <code>Class</code> object

     * is null or is not an interface.

     */

    public <T> T getInterface(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 <code>invokeMethod</code> method.

     *

     * @param <T> the type of the interface to return

     * @param thiz The scripting object whose member functions are used to implement the methods of the interface.

     * @param clasz The <code>Class</code> object of the interface to return.

     *

     * @return An instance of requested interface - null if the requested interface is unavailable,

     * i. e. if compiled methods in the <code>ScriptEngine</code> cannot be found matching

     * the ones in the requested interface.

     *

     * @throws IllegalArgumentException if the specified <code>Class</code> object

     * is null or is not an interface, or if the specified Object is

     * null or does not represent a scripting object.

     */

     public <T> T getInterface(Object thiz, Class<T> clasz);

}