jaroslav@111: /**
jaroslav@111:  * Back 2 Browser Bytecode Translator
jaroslav@111:  * Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
jaroslav@111:  *
jaroslav@111:  * This program is free software: you can redistribute it and/or modify
jaroslav@111:  * it under the terms of the GNU General Public License as published by
jaroslav@111:  * the Free Software Foundation, version 2 of the License.
jaroslav@111:  *
jaroslav@111:  * This program is distributed in the hope that it will be useful,
jaroslav@111:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
jaroslav@111:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
jaroslav@111:  * GNU General Public License for more details.
jaroslav@111:  *
jaroslav@111:  * You should have received a copy of the GNU General Public License
jaroslav@111:  * along with this program. Look for COPYING file in the top folder.
jaroslav@111:  * If not, see http://opensource.org/licenses/GPL-2.0.
jaroslav@111:  */
jaroslav@109: package org.apidesign.bck2brwsr.mojo;
jaroslav@109: 
jaroslav@109: import org.apache.maven.plugin.AbstractMojo;
jaroslav@109: 
jaroslav@109: import java.io.File;
jaroslav@109: import java.io.FileWriter;
jaroslav@305: import java.io.IOException;
jaroslav@109: import java.net.MalformedURLException;
jaroslav@109: import java.net.URL;
jaroslav@109: import java.net.URLClassLoader;
jaroslav@109: import java.util.ArrayList;
jaroslav@109: import java.util.Collection;
jaroslav@109: import java.util.List;
jaroslav@109: import org.apache.maven.artifact.Artifact;
jaroslav@109: import org.apache.maven.plugin.MojoExecutionException;
jaroslav@109: import org.apache.maven.plugins.annotations.LifecyclePhase;
jaroslav@109: import org.apache.maven.plugins.annotations.Mojo;
jaroslav@109: import org.apache.maven.plugins.annotations.Parameter;
jaroslav@1245: import org.apache.maven.plugins.annotations.ResolutionScope;
jaroslav@109: import org.apache.maven.project.MavenProject;
jaroslav@305: import org.apidesign.vm4brwsr.Bck2Brwsr;
lubomir@849: import org.apidesign.vm4brwsr.ObfuscationLevel;
jaroslav@109: 
jaroslav@109: /** Compiles classes into JavaScript. */
jaroslav@1245: @Mojo(name="j2js", 
jaroslav@1245:     requiresDependencyResolution = ResolutionScope.COMPILE,
jaroslav@1245:     defaultPhase=LifecyclePhase.PROCESS_CLASSES
jaroslav@1245: )
jaroslav@740: public class Java2JavaScript extends AbstractMojo {
jaroslav@740:     public Java2JavaScript() {
jaroslav@109:     }
jaroslav@109:     /** Root of the class files */
jaroslav@109:     @Parameter(defaultValue="${project.build.directory}/classes")
jaroslav@109:     private File classes;
jaroslav@847:     /** JavaScript file to generate */
jaroslav@1371:     @Parameter(defaultValue="${project.build.directory}/bck2brwsr.js")
jaroslav@109:     private File javascript;
lubomir@849: 
jaroslav@847:     /** Additional classes that should be pre-compiled into the javascript 
jaroslav@847:      * file. By default compiles all classes found under <code>classes</code>
jaroslav@847:      * directory and their transitive closure.
jaroslav@847:      */
jaroslav@847:     @Parameter
jaroslav@847:     private List<String> compileclasses;
jaroslav@847:     
jaroslav@109:     @Parameter(defaultValue="${project}")
jaroslav@109:     private MavenProject prj;
lubomir@849: 
lubomir@860:     /**
lubomir@860:      * The obfuscation level for the generated JavaScript file.
lubomir@860:      *
lubomir@860:      * @since 0.5
lubomir@860:      */
lubomir@849:     @Parameter(defaultValue="NONE")
lubomir@849:     private ObfuscationLevel obfuscation;
jaroslav@1365:     
jaroslav@1365:     /** Should classes from rt.jar be included? */
jaroslav@1365:     @Parameter(defaultValue = "false")
jaroslav@1365:     private boolean ignoreBootClassPath;
jaroslav@109: 
lubomir@1104:     /**
jaroslav@1503:      * Indicates whether to create an extension library 
jaroslav@1503:      * module instead of a standalone JavaScript VM.
lubomir@1104:      *
jaroslav@1503:      * @since 0.9
lubomir@1104:      */
lubomir@1104:     @Parameter(defaultValue="false")
jaroslav@1503:     private boolean library;
lubomir@1104: 
jaroslav@109:     @Override
jaroslav@109:     public void execute() throws MojoExecutionException {
jaroslav@109:         if (!classes.isDirectory()) {
jaroslav@109:             throw new MojoExecutionException("Can't find " + classes);
jaroslav@109:         }
jaroslav@1366:         if (javascript == null) {
jaroslav@1366:             throw new MojoExecutionException("Need to define 'javascript' attribute with a path to file to generate");
jaroslav@1366:         }
jaroslav@109: 
jaroslav@109:         List<String> arr = new ArrayList<String>();
jaroslav@134:         long newest = collectAllClasses("", classes, arr);
jaroslav@109:         
jaroslav@847:         if (compileclasses != null) {
jaroslav@847:             arr.retainAll(compileclasses);
jaroslav@847:             arr.addAll(compileclasses);
jaroslav@847:         }
jaroslav@847:         
jaroslav@134:         if (javascript.lastModified() > newest) {
jaroslav@134:             return;
jaroslav@134:         }
jaroslav@109: 
jaroslav@109:         try {
jaroslav@1245:             URLClassLoader url = buildClassLoader(classes, prj.getArtifacts());
jaroslav@109:             FileWriter w = new FileWriter(javascript);
jaroslav@1604:             Bck2Brwsr c = Bck2Brwsr.newCompiler().
jaroslav@874:                 obfuscation(obfuscation).
jaroslav@1365:                 resources(url, ignoreBootClassPath).
jaroslav@1604:                 addRootClasses(arr.toArray(new String[0]));
jaroslav@1604:             if (library) {
jaroslav@1604:                 c = c.library();
jaroslav@1604:             }
jaroslav@1604:             c.generate(w);
jaroslav@109:             w.close();
jaroslav@305:         } catch (IOException ex) {
jaroslav@109:             throw new MojoExecutionException("Can't compile", ex);
jaroslav@109:         }
jaroslav@109:     }
jaroslav@109: 
jaroslav@134:     private static long collectAllClasses(String prefix, File toCheck, List<String> arr) {
jaroslav@109:         File[] files = toCheck.listFiles();
jaroslav@109:         if (files != null) {
jaroslav@134:             long newest = 0L;
jaroslav@109:             for (File f : files) {
jaroslav@134:                 long lastModified = collectAllClasses(prefix + f.getName() + "/", f, arr);
jaroslav@134:                 if (newest < lastModified) {
jaroslav@134:                     newest = lastModified;
jaroslav@134:                 }
jaroslav@109:             }
jaroslav@134:             return newest;
jaroslav@109:         } else if (toCheck.getName().endsWith(".class")) {
jaroslav@847:             final String cls = prefix.substring(0, prefix.length() - 7);
lubomir@988:             if (!cls.endsWith("package-info")) {
lubomir@988:                 arr.add(cls);
lubomir@988:             }
jaroslav@134:             return toCheck.lastModified();
jaroslav@134:         } else {
jaroslav@134:             return 0L;
jaroslav@109:         }
jaroslav@109:     }
jaroslav@109: 
jaroslav@109:     private static URLClassLoader buildClassLoader(File root, Collection<Artifact> deps) throws MalformedURLException {
jaroslav@109:         List<URL> arr = new ArrayList<URL>();
jaroslav@109:         arr.add(root.toURI().toURL());
jaroslav@109:         for (Artifact a : deps) {
jaroslav@847:             if (a.getFile() != null) {
jaroslav@847:                 arr.add(a.getFile().toURI().toURL());
jaroslav@847:             }
jaroslav@109:         }
jaroslav@740:         return new URLClassLoader(arr.toArray(new URL[0]), Java2JavaScript.class.getClassLoader());
jaroslav@109:     }
jaroslav@109: }