/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 *
 * ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (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.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
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package com.netscape.nativejsengine;

public class JSContext
{
    private JSContext() {
        // empty
    }
    public static JSContext newContext(JSRuntime runtime) {
        JSContext context = new JSContext();
        context._runtime = runtime;
        if(! context._init())
            return null;
        return context;
    }

    public boolean isValid() {
        return _nativeContext != 0 && _runtime != null;
    }

    // finalization not guaranteed to happen in right order - trust programmer
    public void destroy() {
        _exit();
        _nativeContext = 0;
        _runtime = null;
    }

    public void eval(String s, String filename, int lineno) {
        if(isValid())
            _eval(s, filename, lineno);
    }

    public void load(String filename) {
        if(isValid())
            _load(filename);
    }

    public IErrorSink getErrorSink() {return _errorSink;}
    public IErrorSink setErrorSink(IErrorSink sink) {
        IErrorSink result = _errorSink;
        _errorSink = sink;
        return result;
    }

    public IPrintSink getPrintSink() {return _printSink;}
    public IPrintSink setPrintSink(IPrintSink sink) {
        IPrintSink result = _printSink;
        _printSink = sink;
        return result;
    }

    /*******************************************************************/

    private void _print(String s) {
        if(null != _printSink)
            _printSink.print(s);
    }

    private void _reportError(String msg, String filename, int lineno,
                              String lineBuf, int offset)
    {
        if(null != _errorSink)
            _errorSink.error(msg, filename, lineno, lineBuf, offset);
    }

    private synchronized native boolean _init();
    private synchronized native void _exit();
    private synchronized native void _eval(String s, String filename, int lineno);
    private synchronized native void _load(String filename);

    private long        _nativeContext;
    private JSRuntime   _runtime;
    private IErrorSink  _errorSink;
    private IPrintSink  _printSink;
}