jaroslav@1041: /**
jaroslav@1041:  * Back 2 Browser Bytecode Translator
jaroslav@1041:  * Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
jaroslav@1041:  *
jaroslav@1041:  * This program is free software: you can redistribute it and/or modify
jaroslav@1041:  * it under the terms of the GNU General Public License as published by
jaroslav@1041:  * the Free Software Foundation, version 2 of the License.
jaroslav@1041:  *
jaroslav@1041:  * This program is distributed in the hope that it will be useful,
jaroslav@1041:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
jaroslav@1041:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
jaroslav@1041:  * GNU General Public License for more details.
jaroslav@1041:  *
jaroslav@1041:  * You should have received a copy of the GNU General Public License
jaroslav@1041:  * along with this program. Look for COPYING file in the top folder.
jaroslav@1041:  * If not, see http://opensource.org/licenses/GPL-2.0.
jaroslav@1041:  */
jaroslav@1041: package org.apidesign.bck2brwsr.launcher.fximpl;
jaroslav@1041: 
jaroslav@1174: import java.net.URL;
jaroslav@1175: import java.util.ArrayList;
jaroslav@1175: import java.util.Collections;
jaroslav@1175: import java.util.Enumeration;
jaroslav@1175: import java.util.List;
jaroslav@1041: import java.util.TooManyListenersException;
jaroslav@1041: import javafx.beans.value.ChangeListener;
jaroslav@1174: import javafx.scene.web.WebEngine;
jaroslav@1174: import netscape.javascript.JSObject;
jaroslav@1041: 
jaroslav@1041: /**
jaroslav@1041:  *
jaroslav@1041:  * @author Jaroslav Tulach <jtulach@netbeans.org>
jaroslav@1041:  */
jaroslav@1041: public final class JVMBridge {
jaroslav@1174:     private final WebEngine engine;
jaroslav@1174:     private final WebClassLoader cl;
jaroslav@1174:     
jaroslav@1041:     private static ClassLoader[] ldrs;
jaroslav@1041:     private static ChangeListener<Void> onBck2BrwsrLoad;
jaroslav@1174:     
jaroslav@1174:     JVMBridge(WebEngine eng) {
jaroslav@1174:         this.engine = eng;
jaroslav@1179:         this.cl = new WebClassLoader(JVMBridge.class.getClassLoader().getParent());
jaroslav@1174:     }
jaroslav@1041:         
jaroslav@1041:     public static void registerClassLoaders(ClassLoader[] loaders) {
jaroslav@1041:         ldrs = loaders.clone();
jaroslav@1041:     }
jaroslav@1041:     
jaroslav@1041:     public static void addBck2BrwsrLoad(ChangeListener<Void> l) throws TooManyListenersException {
jaroslav@1041:         if (onBck2BrwsrLoad != null) {
jaroslav@1041:             throw new TooManyListenersException();
jaroslav@1041:         }
jaroslav@1041:         onBck2BrwsrLoad = l;
jaroslav@1041:     }
jaroslav@1041: 
jaroslav@1041:     public static void onBck2BrwsrLoad() {
jaroslav@1041:         ChangeListener<Void> l = onBck2BrwsrLoad;
jaroslav@1041:         if (l != null) {
jaroslav@1041:             l.changed(null, null, null);
jaroslav@1041:         }
jaroslav@1041:     }
jaroslav@1041:     
jaroslav@1041:     public Class<?> loadClass(String name) throws ClassNotFoundException {
jaroslav@1174:         return Class.forName(name, true, cl);
jaroslav@1174:     }
jaroslav@1174:     
jaroslav@1174:     private final class WebClassLoader extends JsClassLoader {
jaroslav@1174:         public WebClassLoader(ClassLoader parent) {
jaroslav@1174:             super(parent);
jaroslav@1174:         }
jaroslav@1174: 
jaroslav@1174:         @Override
jaroslav@1174:         protected URL findResource(String name) {
jaroslav@1174:             if (ldrs != null) for (ClassLoader l : ldrs) {
jaroslav@1174:                 URL u = l.getResource(name);
jaroslav@1174:                 if (u != null) {
jaroslav@1174:                     return u;
jaroslav@1174:                 }
jaroslav@1041:             }
jaroslav@1174:             return null;
jaroslav@1041:         }
jaroslav@1175:         
jaroslav@1175:         @Override
jaroslav@1175:         protected Enumeration<URL> findResources(String name) {
jaroslav@1175:             List<URL> arr = new ArrayList<URL>();
jaroslav@1175:             if (ldrs != null) {
jaroslav@1175:                 for (ClassLoader l : ldrs) {
jaroslav@1175:                     URL u = l.getResource(name);
jaroslav@1175:                     if (u != null) {
jaroslav@1175:                         arr.add(u);
jaroslav@1175:                     }
jaroslav@1175:                 }
jaroslav@1175:             }
jaroslav@1175:             return Collections.enumeration(arr);
jaroslav@1175:         }
jaroslav@1174: 
jaroslav@1174:         @Override
jaroslav@1174:         protected Fn defineFn(String code, String... names) {
jaroslav@1174:             StringBuilder sb = new StringBuilder();
jaroslav@1174:             sb.append("(function() {");
jaroslav@1174:             sb.append("  var x = {};");
jaroslav@1174:             sb.append("  x.fn = function(");
jaroslav@1174:             String sep = "";
jaroslav@1174:             for (String n : names) {
jaroslav@1174:                 sb.append(sep).append(n);
jaroslav@1174:                 sep = ",";
jaroslav@1174:             }
jaroslav@1174:             sb.append(") {\n");
jaroslav@1174:             sb.append(code);
jaroslav@1174:             sb.append("};");
jaroslav@1174:             sb.append("return x;");
jaroslav@1174:             sb.append("})()");
jaroslav@1174:             
jaroslav@1174:             JSObject x = (JSObject) engine.executeScript(sb.toString());
jaroslav@1174:             return new JSFn(x);
jaroslav@1041:         }
jaroslav@1174:     }
jaroslav@1174:     
jaroslav@1174:     private static final class JSFn extends Fn {
jaroslav@1174:         private final JSObject fn;
jaroslav@1174: 
jaroslav@1174:         public JSFn(JSObject fn) {
jaroslav@1174:             this.fn = fn;
jaroslav@1174:         }
jaroslav@1174:         
jaroslav@1174:         @Override
jaroslav@1181:         public Object invoke(Object thiz, Object... args) throws Exception {
jaroslav@1179:             try {
jaroslav@1179:                 return fn.call("fn", args); // NOI18N
jaroslav@1179:             } catch (Error t) {
jaroslav@1179:                 t.printStackTrace();
jaroslav@1179:                 throw t;
jaroslav@1179:             } catch (Exception t) {
jaroslav@1179:                 t.printStackTrace();
jaroslav@1179:                 throw t;
jaroslav@1179:             }
jaroslav@1174:         }
jaroslav@1041:     }
jaroslav@1041: }