2 * Back 2 Browser Bytecode Translator
3 * Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
5 * This program is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, version 2 of the License.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program. Look for COPYING file in the top folder.
16 * If not, see http://opensource.org/licenses/GPL-2.0.
18 package org.apidesign.bck2brwsr.mojo;
20 import org.apache.maven.plugin.AbstractMojo;
23 import java.io.FileWriter;
24 import java.io.IOException;
25 import java.net.MalformedURLException;
27 import java.net.URLClassLoader;
28 import java.util.ArrayList;
29 import java.util.Collection;
30 import java.util.List;
31 import org.apache.maven.artifact.Artifact;
32 import org.apache.maven.plugin.MojoExecutionException;
33 import org.apache.maven.plugins.annotations.LifecyclePhase;
34 import org.apache.maven.plugins.annotations.Mojo;
35 import org.apache.maven.plugins.annotations.Parameter;
36 import org.apache.maven.project.MavenProject;
37 import org.apidesign.vm4brwsr.Bck2Brwsr;
39 /** Compiles classes into JavaScript. */
40 @Mojo(name="j2js", defaultPhase=LifecyclePhase.PROCESS_CLASSES)
41 public class Java2JavaScript extends AbstractMojo {
42 public Java2JavaScript() {
44 /** Root of the class files */
45 @Parameter(defaultValue="${project.build.directory}/classes")
47 /** JavaScript file to generate */
49 private File javascript;
51 /** Additional classes that should be pre-compiled into the javascript
52 * file. By default compiles all classes found under <code>classes</code>
53 * directory and their transitive closure.
56 private List<String> compileclasses;
58 @Parameter(defaultValue="${project}")
59 private MavenProject prj;
64 public void execute() throws MojoExecutionException {
65 if (!classes.isDirectory()) {
66 throw new MojoExecutionException("Can't find " + classes);
69 List<String> arr = new ArrayList<String>();
70 long newest = collectAllClasses("", classes, arr);
72 if (compileclasses != null) {
73 arr.retainAll(compileclasses);
74 arr.addAll(compileclasses);
77 if (javascript.lastModified() > newest) {
82 URLClassLoader url = buildClassLoader(classes, prj.getDependencyArtifacts());
83 FileWriter w = new FileWriter(javascript);
84 Bck2Brwsr.generate(w, url, arr.toArray(new String[0]));
86 } catch (IOException ex) {
87 throw new MojoExecutionException("Can't compile", ex);
91 private static long collectAllClasses(String prefix, File toCheck, List<String> arr) {
92 File[] files = toCheck.listFiles();
95 for (File f : files) {
96 long lastModified = collectAllClasses(prefix + f.getName() + "/", f, arr);
97 if (newest < lastModified) {
98 newest = lastModified;
102 } else if (toCheck.getName().endsWith(".class")) {
103 final String cls = prefix.substring(0, prefix.length() - 7);
105 return toCheck.lastModified();
111 private static URLClassLoader buildClassLoader(File root, Collection<Artifact> deps) throws MalformedURLException {
112 List<URL> arr = new ArrayList<URL>();
113 arr.add(root.toURI().toURL());
114 for (Artifact a : deps) {
115 if (a.getFile() != null) {
116 arr.add(a.getFile().toURI().toURL());
119 return new URLClassLoader(arr.toArray(new URL[0]), Java2JavaScript.class.getClassLoader());