jaroslav@111
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/**
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jaroslav@111
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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.mojo;
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import org.apache.maven.plugin.AbstractMojo;
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import java.io.File;
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import java.io.FileWriter;
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import java.io.IOException;
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import java.net.MalformedURLException;
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import java.net.URL;
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import java.net.URLClassLoader;
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import java.util.ArrayList;
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import java.util.Collection;
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import java.util.List;
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import org.apache.maven.artifact.Artifact;
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import org.apache.maven.plugin.MojoExecutionException;
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import org.apache.maven.plugins.annotations.LifecyclePhase;
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import org.apache.maven.plugins.annotations.Mojo;
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import org.apache.maven.plugins.annotations.Parameter;
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import org.apache.maven.plugins.annotations.ResolutionScope;
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import org.apache.maven.project.MavenProject;
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import org.apidesign.vm4brwsr.Bck2Brwsr;
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import org.apidesign.vm4brwsr.ObfuscationLevel;
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/** Compiles classes into JavaScript. */
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@Mojo(name="j2js",
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requiresDependencyResolution = ResolutionScope.COMPILE,
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defaultPhase=LifecyclePhase.PROCESS_CLASSES
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)
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public class Java2JavaScript extends AbstractMojo {
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public Java2JavaScript() {
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}
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/** Root of the class files */
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@Parameter(defaultValue="${project.build.directory}/classes")
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private File classes;
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/** JavaScript file to generate */
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@Parameter(defaultValue="${project.build.directory}/bck2brwsr.js")
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private File javascript;
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/** Additional classes that should be pre-compiled into the javascript
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* file. By default compiles all classes found under <code>classes</code>
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* directory and their transitive closure.
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*/
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@Parameter
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private List<String> compileclasses;
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@Parameter(defaultValue="${project}")
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private MavenProject prj;
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/**
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* The obfuscation level for the generated JavaScript file.
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*
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* @since 0.5
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*/
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@Parameter(defaultValue="NONE")
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private ObfuscationLevel obfuscation;
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/** Should classes from rt.jar be included? */
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@Parameter(defaultValue = "false")
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private boolean ignoreBootClassPath;
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/**
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* Indicates whether to create an extension library
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* module instead of a standalone JavaScript VM.
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*
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* @since 0.9
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*/
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@Parameter(defaultValue="false")
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private boolean library;
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@Override
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public void execute() throws MojoExecutionException {
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if (!classes.isDirectory()) {
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throw new MojoExecutionException("Can't find " + classes);
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}
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if (javascript == null) {
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throw new MojoExecutionException("Need to define 'javascript' attribute with a path to file to generate");
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}
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List<String> arr = new ArrayList<String>();
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long newest = collectAllClasses("", classes, arr);
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if (compileclasses != null) {
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arr.retainAll(compileclasses);
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arr.addAll(compileclasses);
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}
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if (javascript.lastModified() > newest) {
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return;
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}
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try {
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URLClassLoader url = buildClassLoader(classes, prj.getArtifacts());
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FileWriter w = new FileWriter(javascript);
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Bck2Brwsr c = Bck2Brwsr.newCompiler().
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obfuscation(obfuscation).
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resources(url, ignoreBootClassPath).
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addRootClasses(arr.toArray(new String[0]));
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if (library) {
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c = c.library();
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}
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c.generate(w);
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w.close();
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} catch (IOException ex) {
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throw new MojoExecutionException("Can't compile", ex);
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}
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}
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private static long collectAllClasses(String prefix, File toCheck, List<String> arr) {
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File[] files = toCheck.listFiles();
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if (files != null) {
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long newest = 0L;
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for (File f : files) {
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long lastModified = collectAllClasses(prefix + f.getName() + "/", f, arr);
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if (newest < lastModified) {
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newest = lastModified;
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}
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}
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return newest;
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} else if (toCheck.getName().endsWith(".class")) {
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final String cls = prefix.substring(0, prefix.length() - 7);
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if (!cls.endsWith("package-info")) {
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arr.add(cls);
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}
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return toCheck.lastModified();
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} else {
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return 0L;
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}
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}
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private static URLClassLoader buildClassLoader(File root, Collection<Artifact> deps) throws MalformedURLException {
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List<URL> arr = new ArrayList<URL>();
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arr.add(root.toURI().toURL());
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for (Artifact a : deps) {
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if (a.getFile() != null) {
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arr.add(a.getFile().toURI().toURL());
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}
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}
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return new URLClassLoader(arr.toArray(new URL[0]), Java2JavaScript.class.getClassLoader());
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}
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}
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