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/**
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* Back 2 Browser Bytecode Translator
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* Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. Look for COPYING file in the top folder.
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* If not, see http://opensource.org/licenses/GPL-2.0.
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*/
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package org.apidesign.bck2brwsr.launcher.fximpl;
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import java.io.BufferedReader;
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import java.io.Reader;
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import java.net.URL;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.Collection;
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import java.util.List;
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import java.util.TooManyListenersException;
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import javafx.beans.value.ChangeListener;
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import javafx.scene.web.WebEngine;
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import netscape.javascript.JSObject;
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import org.apidesign.html.boot.spi.Fn;
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import org.netbeans.html.boot.impl.FindResources;
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import org.netbeans.html.boot.impl.FnUtils;
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/**
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*
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* @author Jaroslav Tulach <jtulach@netbeans.org>
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*/
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public final class JVMBridge {
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private final WebEngine engine;
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private final ClassLoader cl;
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private final WebPresenter presenter;
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private static ClassLoader[] ldrs;
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private static ChangeListener<Void> onBck2BrwsrLoad;
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JVMBridge(WebEngine eng) {
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this.engine = eng;
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final ClassLoader p = JVMBridge.class.getClassLoader().getParent();
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this.presenter = new WebPresenter();
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this.cl = FnUtils.newLoader(presenter, presenter, p);
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}
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public static void registerClassLoaders(ClassLoader[] loaders) {
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ldrs = loaders.clone();
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}
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public static void addBck2BrwsrLoad(ChangeListener<Void> l) throws TooManyListenersException {
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if (onBck2BrwsrLoad != null) {
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throw new TooManyListenersException();
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}
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onBck2BrwsrLoad = l;
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}
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public static void onBck2BrwsrLoad() {
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ChangeListener<Void> l = onBck2BrwsrLoad;
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if (l != null) {
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l.changed(null, null, null);
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}
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}
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public Class<?> loadClass(String name) throws ClassNotFoundException {
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Fn.activate(presenter);
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return Class.forName(name, true, cl);
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}
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private final class WebPresenter implements FindResources, Fn.Presenter {
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@Override
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public void findResources(String name, Collection<? super URL> results, boolean oneIsEnough) {
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if (ldrs != null) for (ClassLoader l : ldrs) {
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URL u = l.getResource(name);
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if (u != null) {
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results.add(u);
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}
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}
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}
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@Override
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public Fn defineFn(String code, String... names) {
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StringBuilder sb = new StringBuilder();
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sb.append("(function() {");
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sb.append(" return function(");
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String sep = "";
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for (String n : names) {
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sb.append(sep).append(n);
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sep = ",";
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}
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sb.append(") {\n");
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sb.append(code);
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sb.append("};");
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sb.append("})()");
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JSObject x = (JSObject) engine.executeScript(sb.toString());
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return new JSFn(this, x);
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}
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@Override
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public void displayPage(URL page, Runnable onPageLoad) {
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throw new UnsupportedOperationException("Not supported yet.");
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}
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@Override
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public void loadScript(Reader code) throws Exception {
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BufferedReader r = new BufferedReader(code);
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StringBuilder sb = new StringBuilder();
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for (;;) {
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String l = r.readLine();
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if (l == null) {
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break;
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}
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sb.append(l).append('\n');
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}
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engine.executeScript(sb.toString());
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}
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}
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private static final class JSFn extends Fn {
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private final JSObject fn;
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private JSFn(WebPresenter cl, JSObject fn) {
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super(cl);
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this.fn = fn;
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}
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@Override
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public Object invoke(Object thiz, Object... args) throws Exception {
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try {
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List<Object> all = new ArrayList<Object>(args.length + 1);
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all.add(thiz == null ? fn : thiz);
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all.addAll(Arrays.asList(args));
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Object ret = fn.call("call", all.toArray()); // NOI18N
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return ret == fn ? null : ret;
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} catch (Error t) {
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t.printStackTrace();
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throw t;
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} catch (Exception t) {
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t.printStackTrace();
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throw t;
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}
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}
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}
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}
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