/*

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   this work for additional information regarding copyright ownership.
   The ASF licenses this file to You under the Apache License, Version 2.0
   (the "License"); you may not use this file except in compliance with
   the License.  You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
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package org.apache.batik.script;

import java.io.IOException;
import java.io.Reader;
import java.io.Writer;

A high level interface that represents an interpreter engine for
a particular scripting language.
Author:
Christophe Jolif
Version:
$Id: Interpreter.java 1733416 2016-03-03 07:07:13Z gadams $/**
 * A high level interface that represents an interpreter engine for
 * a particular scripting language.
 *
 * @author <a href="mailto:cjolif@ilog.fr">Christophe Jolif</a>
 * @version $Id: Interpreter.java 1733416 2016-03-03 07:07:13Z gadams $
 */
public interface Interpreter extends org.apache.batik.i18n.Localizable {

    
Returns the content types of the scripting languages this interpreter
handles.
/**
     * Returns the content types of the scripting languages this interpreter
     * handles.
     */
    String[] getMimeTypes();

    
This method should evaluate a piece of script associated to a given 
description.
Params:
scriptreader – a java.io.Reader on the piece of script
description – description which can be later used (e.g., for error 
       messages).
Returns:
if no exception is thrown during the call, should return the
value of the last expression evaluated in the script/**
     * This method should evaluate a piece of script associated to a given 
     * description.
     *
     * @param scriptreader a <code>java.io.Reader</code> on the piece of script
     * @param description description which can be later used (e.g., for error 
     *        messages).
     * @return if no exception is thrown during the call, should return the
     * value of the last expression evaluated in the script
     */
    Object evaluate(Reader scriptreader, String description)
        throws InterpreterException, IOException;

    
This method should evaluate a piece of script.
Params:
scriptreader – a java.io.Reader on the piece of script
Returns:
if no exception is thrown during the call, should return the
value of the last expression evaluated in the script/**
     * This method should evaluate a piece of script.
     *
     * @param scriptreader a <code>java.io.Reader</code> on the piece of script
     * @return if no exception is thrown during the call, should return the
     * value of the last expression evaluated in the script
     */
    Object evaluate(Reader scriptreader)
        throws InterpreterException, IOException;

    
This method should evaluate a piece of script using a String
instead of a Reader. This usually allows do easily do some
caching.
Params:
script – the piece of script
Returns:
if no exception is thrown during the call, should return the
value of the last expression evaluated in the script/**
     * This method should evaluate a piece of script using a <code>String</code>
     * instead of a <code>Reader</code>. This usually allows do easily do some
     * caching.
     *
     * @param script the piece of script
     * @return if no exception is thrown during the call, should return the
     * value of the last expression evaluated in the script
     */
    Object evaluate(String script)
        throws InterpreterException;

    
This method should register a particular Java Object in
the environment of the interpreter.
Params:
name – the name of the script object to create
object – the Java object/**
     * This method should register a particular Java <code>Object</code> in
     * the environment of the interpreter.
     *
     * @param name the name of the script object to create
     * @param object the Java object
     */
    void bindObject(String name, Object object);

    
This method should change the output Writer that will be
used when output function of the scripting langage is used.
Params:
output – the new out Writer./**
     * This method should change the output <code>Writer</code> that will be
     * used when output function of the scripting langage is used.
     *
     * @param output the new out <code>Writer</code>.
     */
    void setOut(Writer output);

    
This method can dispose resources used by the interpreter when it is
no longer used. Be careful, you SHOULD NOT use this interpreter instance
after calling this method.
/**
     * This method can dispose resources used by the interpreter when it is
     * no longer used. Be careful, you SHOULD NOT use this interpreter instance
     * after calling this method.
     */
    void dispose();
}