jaroslav@1253: /**
jaroslav@1253:  * Back 2 Browser Bytecode Translator
jaroslav@1253:  * Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
jaroslav@1253:  *
jaroslav@1253:  * This program is free software: you can redistribute it and/or modify
jaroslav@1253:  * it under the terms of the GNU General Public License as published by
jaroslav@1253:  * the Free Software Foundation, version 2 of the License.
jaroslav@1253:  *
jaroslav@1253:  * This program is distributed in the hope that it will be useful,
jaroslav@1253:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
jaroslav@1253:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
jaroslav@1253:  * GNU General Public License for more details.
jaroslav@1253:  *
jaroslav@1253:  * You should have received a copy of the GNU General Public License
jaroslav@1253:  * along with this program. Look for COPYING file in the top folder.
jaroslav@1253:  * If not, see http://opensource.org/licenses/GPL-2.0.
jaroslav@1253:  */
jaroslav@1253: package org.apidesign.bck2brwsr.ko2brwsr;
jaroslav@1253: 
jaroslav@1253: import net.java.html.js.JavaScriptBody;
jaroslav@1253: import org.apidesign.html.json.spi.JSONCall;
jaroslav@1253: 
jaroslav@1253: /** Communication with WebSockets for WebView 1.8.
jaroslav@1253:  *
jaroslav@1253:  * @author Jaroslav Tulach <jtulach@netbeans.org>
jaroslav@1253:  */
jaroslav@1253: final class LoadWS {
jaroslav@1253:     private static final boolean SUPPORTED = isWebSocket();
jaroslav@1253:     private final Object ws;
jaroslav@1253:     private final JSONCall call;
jaroslav@1253:     LoadWS(JSONCall first, String url) {
jaroslav@1253:         call = first;
jaroslav@1253:         ws = initWebSocket(this, url);
jaroslav@1253:         if (ws == null) {
jaroslav@1253:             first.notifyError(new IllegalArgumentException("Wrong URL: " + url));
jaroslav@1253:         }
jaroslav@1253:     }
jaroslav@1253:     
jaroslav@1253:     static boolean isSupported() {
jaroslav@1253:         return SUPPORTED;
jaroslav@1253:     }
jaroslav@1253:     
jaroslav@1253:     void send(JSONCall call) {
jaroslav@1253:         push(call);
jaroslav@1253:     }
jaroslav@1253:     
jaroslav@1253:     private synchronized void push(JSONCall call) {
jaroslav@1253:         send(ws, call.getMessage());
jaroslav@1253:     }
jaroslav@1253: 
jaroslav@1253:     void onOpen(Object ev) {
jaroslav@1253:         if (!call.isDoOutput()) {
jaroslav@1253:             call.notifySuccess(null);
jaroslav@1253:         }
jaroslav@1253:     }
jaroslav@1253:     
jaroslav@1253:     
jaroslav@1253:     @JavaScriptBody(args = { "data" }, body = "try {\n"
jaroslav@1253:         + "    return eval('(' + data + ')');\n"
jaroslav@1253:         + "  } catch (error) {;\n"
jaroslav@1253:         + "    return data;\n"
jaroslav@1253:         + "  }\n"
jaroslav@1253:     )
jaroslav@1253:     private static native Object toJSON(String data);
jaroslav@1253:     
jaroslav@1253:     void onMessage(Object ev, String data) {
jaroslav@1253:         Object json = toJSON(data);
jaroslav@1253:         call.notifySuccess(json);
jaroslav@1253:     }
jaroslav@1253:     
jaroslav@1253:     void onError(Object ev) {
jaroslav@1253:         call.notifyError(new Exception(ev.toString()));
jaroslav@1253:     }
jaroslav@1253: 
jaroslav@1253:     void onClose(boolean wasClean, int code, String reason) {
jaroslav@1253:         call.notifyError(null);
jaroslav@1253:     }
jaroslav@1253:     
jaroslav@1253:     @JavaScriptBody(args = {}, body = "if (window.WebSocket) return true; else return false;")
jaroslav@1253:     private static boolean isWebSocket() {
jaroslav@1253:         return false;
jaroslav@1253:     }
jaroslav@1253: 
jaroslav@1253:     @JavaScriptBody(args = { "back", "url" }, javacall = true, body = ""
jaroslav@1253:         + "if (window.WebSocket) {\n"
jaroslav@1253:         + "  try {\n"
jaroslav@1253:         + "    var ws = new window.WebSocket(url);\n"
jaroslav@1253:         + "    ws.onopen = function(ev) {\n"
jaroslav@1253:         + "      back.@org.apidesign.bck2brwsr.ko2brwsr.LoadWS::onOpen(Ljava/lang/Object;)(ev);\n"
jaroslav@1253:         + "    };\n"
jaroslav@1253:         + "    ws.onmessage = function(ev) {\n"
jaroslav@1253:         + "      back.@org.apidesign.bck2brwsr.ko2brwsr.LoadWS::onMessage(Ljava/lang/Object;Ljava/lang/String;)(ev, ev.data);\n"
jaroslav@1253:         + "    };\n"
jaroslav@1253:         + "    ws.onerror = function(ev) {\n"
jaroslav@1253:         + "      back.@org.apidesign.bck2brwsr.ko2brwsr.LoadWS::onError(Ljava/lang/Object;)(ev);\n"
jaroslav@1253:         + "    };\n"
jaroslav@1253:         + "    ws.onclose = function(ev) {\n"
jaroslav@1253:         + "      back.@org.apidesign.bck2brwsr.ko2brwsr.LoadWS::onClose(ZILjava/lang/String;)(ev.wasClean, ev.code, ev.reason);\n"
jaroslav@1253:         + "    };\n"
jaroslav@1253:         + "    return ws;\n"
jaroslav@1253:         + "  } catch (ex) {\n"
jaroslav@1253:         + "    return null;\n"
jaroslav@1253:         + "  }\n"
jaroslav@1253:         + "} else {\n"
jaroslav@1253:         + "  return null;\n"
jaroslav@1253:         + "}\n"
jaroslav@1253:     )
jaroslav@1253:     private static Object initWebSocket(Object back, String url) {
jaroslav@1253:         return null;
jaroslav@1253:     }
jaroslav@1253:     
jaroslav@1253: 
jaroslav@1253:     @JavaScriptBody(args = { "ws", "msg" }, body = ""
jaroslav@1253:         + "ws.send(msg);"
jaroslav@1253:     )
jaroslav@1253:     private void send(Object ws, String msg) {
jaroslav@1253:     }
jaroslav@1253: 
jaroslav@1253:     @JavaScriptBody(args = { "ws" }, body = "ws.close();")
jaroslav@1253:     private static void close(Object ws) {
jaroslav@1253:     }
jaroslav@1253: 
jaroslav@1253:     void close() {
jaroslav@1253:         close(ws);
jaroslav@1253:     }
jaroslav@1253: }