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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;
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import java.awt.Desktop;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.OutputStream;
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import java.io.Writer;
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import java.net.URI;
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import java.net.URISyntaxException;
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import java.net.URL;
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import java.util.ArrayList;
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import java.util.Enumeration;
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import java.util.LinkedHashSet;
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import java.util.List;
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import java.util.Set;
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import java.util.concurrent.CountDownLatch;
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import static org.apidesign.bck2brwsr.launcher.Bck2BrwsrLauncher.copyStream;
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import org.apidesign.vm4brwsr.Bck2Brwsr;
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import org.glassfish.grizzly.PortRange;
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import org.glassfish.grizzly.http.server.HttpHandler;
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import org.glassfish.grizzly.http.server.HttpServer;
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import org.glassfish.grizzly.http.server.NetworkListener;
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import org.glassfish.grizzly.http.server.Request;
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import org.glassfish.grizzly.http.server.Response;
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import org.glassfish.grizzly.http.server.ServerConfiguration;
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/**
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* Lightweight server to launch Bck2Brwsr applications in real browser.
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*/
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public class Bck2BrwsrLauncher {
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private Set<ClassLoader> loaders = new LinkedHashSet<>();
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private List<MethodInvocation> methods = new ArrayList<>();
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public MethodInvocation addMethod(Class<?> clazz, String method) {
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loaders.add(clazz.getClassLoader());
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MethodInvocation c = new MethodInvocation(clazz.getName(), method);
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methods.add(c);
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return c;
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}
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public static void main( String[] args ) throws Exception {
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Bck2BrwsrLauncher l = new Bck2BrwsrLauncher();
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final MethodInvocation[] cases = {
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l.addMethod(Console.class, "welcome"),
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l.addMethod(Console.class, "multiply"),
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};
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l.execute();
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for (MethodInvocation c : cases) {
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System.err.println(c.className + "." + c.methodName + " = " + c.result);
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}
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}
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public void execute() throws URISyntaxException, IOException, InterruptedException {
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final CountDownLatch wait = new CountDownLatch(1);
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final MethodInvocation[] cases = this.methods.toArray(new MethodInvocation[0]);
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HttpServer server = HttpServer.createSimpleServer(".", new PortRange(8080, 65535));
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Res resources = new Res();
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final ServerConfiguration conf = server.getServerConfiguration();
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conf.addHttpHandler(new Page("console.xhtml",
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"org.apidesign.bck2brwsr.launcher.Console", "welcome", "false"
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), "/console");
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conf.addHttpHandler(new VM(resources), "/bck2brwsr.js");
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conf.addHttpHandler(new VMInit(), "/vm.js");
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conf.addHttpHandler(new Classes(resources), "/classes/");
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conf.addHttpHandler(new HttpHandler() {
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int cnt;
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@Override
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public void service(Request request, Response response) throws Exception {
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String id = request.getParameter("request");
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String value = request.getParameter("result");
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if (id != null && value != null) {
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value = value.replace("%20", " ");
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cases[Integer.parseInt(id)].result = value;
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}
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if (cnt >= cases.length) {
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response.getWriter().write("");
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wait.countDown();
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cnt = 0;
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return;
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}
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response.getWriter().write("{"
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+ "className: '" + cases[cnt].className + "', "
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+ "methodName: '" + cases[cnt].methodName + "', "
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+ "request: " + cnt
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+ "}");
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cnt++;
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}
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}, "/data");
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conf.addHttpHandler(new Page("harness.xhtml"), "/");
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server.start();
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NetworkListener listener = server.getListeners().iterator().next();
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int port = listener.getPort();
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URI uri = new URI("http://localhost:" + port + "/execute");
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try {
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Desktop.getDesktop().browse(uri);
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} catch (UnsupportedOperationException ex) {
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String[] cmd = {
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"xdg-open", uri.toString()
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};
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Runtime.getRuntime().exec(cmd).waitFor();
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}
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wait.await();
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}
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static void copyStream(InputStream is, OutputStream os, String baseURL, String... params) throws IOException {
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for (;;) {
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int ch = is.read();
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if (ch == -1) {
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break;
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}
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if (ch == '$') {
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int cnt = is.read() - '0';
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if (cnt == 'U' - '0') {
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os.write(baseURL.getBytes());
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}
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if (cnt < params.length) {
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os.write(params[cnt].getBytes());
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}
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} else {
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os.write(ch);
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}
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}
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}
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private class Res implements Bck2Brwsr.Resources {
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@Override
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public InputStream get(String resource) throws IOException {
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for (ClassLoader l : loaders) {
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URL u = null;
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Enumeration<URL> en = l.getResources(resource);
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while (en.hasMoreElements()) {
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u = en.nextElement();
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}
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if (u != null) {
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return u.openStream();
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}
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}
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throw new IOException("Can't find " + resource);
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}
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}
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private static class Page extends HttpHandler {
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private final String resource;
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private final String[] args;
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public Page(String resource, String... args) {
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this.resource = resource;
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this.args = args;
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}
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@Override
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public void service(Request request, Response response) throws Exception {
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response.setContentType("text/html");
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OutputStream os = response.getOutputStream();
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InputStream is = Bck2BrwsrLauncher.class.getResourceAsStream(resource);
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copyStream(is, os, request.getRequestURL().toString(), args);
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}
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}
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private static class VM extends HttpHandler {
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private final Res loader;
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public VM(Res loader) {
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this.loader = loader;
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}
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@Override
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public void service(Request request, Response response) throws Exception {
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response.setCharacterEncoding("UTF-8");
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response.setContentType("text/javascript");
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Bck2Brwsr.generate(response.getWriter(), loader);
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}
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}
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private static class VMInit extends HttpHandler {
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public VMInit() {
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}
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@Override
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public void service(Request request, Response response) throws Exception {
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response.setCharacterEncoding("UTF-8");
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response.setContentType("text/javascript");
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response.getWriter().append(
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"function ldCls(res) {\n"
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+ " var request = new XMLHttpRequest();\n"
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+ " request.open('GET', 'classes/' + res, false);\n"
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+ " request.send();\n"
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+ " var arr = eval('(' + request.responseText + ')');\n"
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+ " return arr;\n"
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+ "}\n"
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+ "var vm = new bck2brwsr(ldCls);\n");
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}
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}
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private static class Classes extends HttpHandler {
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private final Res loader;
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public Classes(Res loader) {
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this.loader = loader;
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}
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@Override
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public void service(Request request, Response response) throws Exception {
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String res = request.getHttpHandlerPath();
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if (res.startsWith("/")) {
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res = res.substring(1);
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}
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try (InputStream is = loader.get(res)) {
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response.setContentType("text/javascript");
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Writer w = response.getWriter();
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w.append("[");
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for (int i = 0;; i++) {
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int b = is.read();
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if (b == -1) {
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break;
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}
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if (i > 0) {
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w.append(", ");
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}
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if (i % 20 == 0) {
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w.write("\n");
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}
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if (b > 127) {
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b = b - 256;
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}
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w.append(Integer.toString(b));
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}
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w.append("\n]");
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} catch (IOException ex) {
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response.setError();
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response.setDetailMessage(ex.getMessage());
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}
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}
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}
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public static final class MethodInvocation {
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final String className;
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final String methodName;
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String result;
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MethodInvocation(String className, String methodName) {
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this.className = className;
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this.methodName = methodName;
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}
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@Override
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public String toString() {
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return result;
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}
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}
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}
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