1.1 --- a/vm/src/main/java/org/apidesign/vm4brwsr/Bck2Brwsr.java Tue Feb 26 14:55:55 2013 +0100
1.2 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000
1.3 @@ -1,116 +0,0 @@
1.4 -/**
1.5 - * Back 2 Browser Bytecode Translator
1.6 - * Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
1.7 - *
1.8 - * This program is free software: you can redistribute it and/or modify
1.9 - * it under the terms of the GNU General Public License as published by
1.10 - * the Free Software Foundation, version 2 of the License.
1.11 - *
1.12 - * This program is distributed in the hope that it will be useful,
1.13 - * but WITHOUT ANY WARRANTY; without even the implied warranty of
1.14 - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1.15 - * GNU General Public License for more details.
1.16 - *
1.17 - * You should have received a copy of the GNU General Public License
1.18 - * along with this program. Look for COPYING file in the top folder.
1.19 - * If not, see http://opensource.org/licenses/GPL-2.0.
1.20 - */
1.21 -package org.apidesign.vm4brwsr;
1.22 -
1.23 -import java.io.IOException;
1.24 -import java.io.InputStream;
1.25 -import java.net.URL;
1.26 -import java.util.Enumeration;
1.27 -
1.28 -/** Build your own virtual machine! Use methods in this class to generate
1.29 - * a skeleton JVM in JavaScript that contains pre-compiled classes of your
1.30 - * choice. The generated script defines one JavaScript method that can
1.31 - * be used to bootstrap and load the virtual machine: <pre>
1.32 - * var vm = bck2brwsr();
1.33 - * var main = vm.loadClass('org.your.pkg.Main');
1.34 - * main.main__V_3Ljava_lang_String_2(null);
1.35 - * </pre>
1.36 - * In case one wants to initialize the virtual machine with ability to
1.37 - * load classes lazily when needed, one can provide a loader function to
1.38 - * when creating the virtual machine: <pre>
1.39 - * var vm = bck2brwsr(function(resource) {
1.40 - * return null; // byte[] for the resource
1.41 - * });
1.42 - * </pre>
1.43 - * In this scenario, when a request for an unknown class is made, the loader
1.44 - * function is asked for its byte code and the system dynamically transforms
1.45 - * it to JavaScript.
1.46 - * <p>
1.47 - * Instead of a loader function, one can also provide a URL to a JAR file.
1.48 - * The <code>bck2brwsr</code> system will do its best to download the file
1.49 - * and provide loader function for it automatically.
1.50 - * <p>
1.51 - * One can provide as many loader functions and JAR URL references as necessary.
1.52 - * Then the initialization code would look like:<pre>
1.53 - * var vm = bck2brwsr(url1, url2, fnctn1, url3, functn2);
1.54 - * </pre>
1.55 - * The provided URLs and loader functions will be consulted one by one.
1.56 - *
1.57 - * @author Jaroslav Tulach <jtulach@netbeans.org>
1.58 - */
1.59 -public final class Bck2Brwsr {
1.60 - private Bck2Brwsr() {
1.61 - }
1.62 -
1.63 - /** Generates virtual machine from bytes served by a <code>resources</code>
1.64 - * provider.
1.65 - *
1.66 - * @param out the output to write the generated JavaScript to
1.67 - * @param resources provider of class files to use
1.68 - * @param classes additional classes to include in the generated script
1.69 - * @throws IOException I/O exception can be thrown when something goes wrong
1.70 - */
1.71 - public static void generate(Appendable out, Resources resources, String... classes) throws IOException {
1.72 - StringArray arr = StringArray.asList(classes);
1.73 - arr.add(VM.class.getName().replace('.', '/'));
1.74 - VM.compile(resources, out, arr);
1.75 - }
1.76 -
1.77 - /** Generates virtual machine from bytes served by a class loader.
1.78 - *
1.79 - * @param out the output to write the generated JavaScript to
1.80 - * @param loader class loader to load needed classes from
1.81 - * @param classes additional classes to include in the generated script
1.82 - * @throws IOException I/O exception can be thrown when something goes wrong
1.83 - */
1.84 - public static void generate(Appendable out, final ClassLoader loader, String... classes) throws IOException {
1.85 - class R implements Resources {
1.86 - @Override
1.87 - public InputStream get(String name) throws IOException {
1.88 - Enumeration<URL> en = loader.getResources(name);
1.89 - URL u = null;
1.90 - while (en.hasMoreElements()) {
1.91 - u = en.nextElement();
1.92 - }
1.93 - if (u == null) {
1.94 - throw new IOException("Can't find " + name);
1.95 - }
1.96 - return u.openStream();
1.97 - }
1.98 - }
1.99 - generate(out, new R(), classes);
1.100 - }
1.101 -
1.102 - /** Provider of resources (classes and other files). The
1.103 - * {@link #generate(java.lang.Appendable, org.apidesign.vm4brwsr.Bck2Brwsr.Resources, java.lang.String[])
1.104 - * generator method} will call back here for all classes needed during
1.105 - * translation to JavaScript.
1.106 - */
1.107 - public interface Resources {
1.108 - /** Loads given resource (class or other file like image). The
1.109 - * resource name to load bytes for the {@link String} class
1.110 - * would be <code>"java/lang/String.class"</code>.
1.111 - *
1.112 - * @param resource path to resource to load
1.113 - * @return the input stream for the resource
1.114 - * @throws IOException can be thrown if the loading fails on some error
1.115 - * or the file cannot be found
1.116 - */
1.117 - public InputStream get(String resource) throws IOException;
1.118 - }
1.119 -}