/**

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

  *

  * Copyright 2013-2014 Oracle and/or its affiliates. All rights reserved.

  *

  * Oracle and Java are registered trademarks of Oracle and/or its affiliates.

  * Other names may be trademarks of their respective owners.

  *

  * The contents of this file are subject to the terms of either the GNU

  * General Public License Version 2 only ("GPL") or the Common

  * Development and Distribution License("CDDL") (collectively, the

  * "License"). You may not use this file except in compliance with the

  * License. You can obtain a copy of the License at

  * http://www.netbeans.org/cddl-gplv2.html

  * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the

  * specific language governing permissions and limitations under the

  * License.  When distributing the software, include this License Header

  * Notice in each file and include the License file at

  * nbbuild/licenses/CDDL-GPL-2-CP.  Oracle designates this

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

  * by Oracle in the GPL Version 2 section of the License file that

  * accompanied this code. If applicable, add the following below the

  * License Header, with the fields enclosed by brackets [] replaced by

  * your own identifying information:

  * "Portions Copyrighted [year] [name of copyright owner]"

  *

  * Contributor(s):

  *

  * The Original Software is NetBeans. The Initial Developer of the Original

  * Software is Oracle. Portions Copyright 2013-2014 Oracle. All Rights Reserved.

  *

  * If you wish your version of this file to be governed by only the CDDL

  * or only the GPL Version 2, indicate your decision by adding

  * "[Contributor] elects to include this software in this distribution

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  * single choice of license, a recipient has the option to distribute

  * your version of this file under either the CDDL, the GPL Version 2 or

  * to extend the choice of license to its licensees as provided above.

  * However, if you add GPL Version 2 code and therefore, elected the GPL

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 package org.netbeans.html.ko4j;

 import net.java.html.js.JavaScriptBody;

 import org.apidesign.html.json.spi.JSONCall;

 /** Communication with WebSockets via browser's WebSocket object.

  *

  * @author Jaroslav Tulach <jtulach@netbeans.org>

  */

 final class LoadWS {

     private final Object ws;

     private final JSONCall call;

     LoadWS(JSONCall first, String url) {

         call = first;

         ws = initWebSocket(this, url);

         if (ws == null) {

             first.notifyError(new IllegalArgumentException("Wrong URL: " + url));

         }

     }

     void send(JSONCall call) {

         push(call);

     }

     private synchronized void push(JSONCall call) {

         send(ws, call.getMessage());

     }

     void onOpen(Object ev) {

         if (!call.isDoOutput()) {

             call.notifySuccess(null);

         }

     }

     @JavaScriptBody(args = { "data" }, body = "try {\n"

         + "    return eval('(' + data + ')');\n"

         + "  } catch (error) {;\n"

         + "    return data;\n"

         + "  }\n"

     )

     private static native Object toJSON(String data);

     void onMessage(Object ev, String data) {

         Object json = toJSON(data);

         call.notifySuccess(json);

     }

     void onError(Object ev) {

         call.notifyError(new Exception(ev.toString()));

     }

     void onClose(boolean wasClean, int code, String reason) {

         call.notifyError(null);

     }

     @JavaScriptBody(args = { "back", "url" }, javacall = true, body = ""

         + "if (window.WebSocket) {\n"

         + "  try {\n"

         + "    var ws = new window.WebSocket(url);\n"

         + "    ws.onopen = function(ev) {\n"

         + "      back.@org.netbeans.html.ko4j.LoadWS::onOpen(Ljava/lang/Object;)(ev);\n"

         + "    };\n"

         + "    ws.onmessage = function(ev) {\n"

         + "      back.@org.netbeans.html.ko4j.LoadWS::onMessage(Ljava/lang/Object;Ljava/lang/String;)(ev, ev.data);\n"

         + "    };\n"

         + "    ws.onerror = function(ev) {\n"

         + "      back.@org.netbeans.html.ko4j.LoadWS::onError(Ljava/lang/Object;)(ev);\n"

         + "    };\n"

         + "    ws.onclose = function(ev) {\n"

         + "      back.@org.netbeans.html.ko4j.LoadWS::onClose(ZILjava/lang/String;)(ev.wasClean, ev.code, ev.reason);\n"

         + "    };\n"

         + "    return ws;\n"

         + "  } catch (ex) {\n"

         + "    return null;\n"

         + "  }\n"

         + "} else {\n"

         + "  return null;\n"

         + "}\n"

     )

     private static Object initWebSocket(Object back, String url) {

         return null;

     }

     @JavaScriptBody(args = { "ws", "msg" }, body = ""

         + "ws.send(msg);"

     )

     private void send(Object ws, String msg) {

     }

     @JavaScriptBody(args = { "ws" }, body = "ws.close();")

     private static void close(Object ws) {

     }

     void close() {

         close(ws);

     }

 }