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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.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.project.MavenProject;
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import org.apidesign.vm4brwsr.Bck2Brwsr;
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/** Compiles classes into JavaScript. */
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@Mojo(name="j2js", defaultPhase=LifecyclePhase.PROCESS_CLASSES)
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public class Bck2BrswrMojo extends AbstractMojo {
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public Bck2BrswrMojo() {
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}
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/** Root of the class files */
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@Parameter(defaultValue="${project.build.directory}/classes")
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private File classes;
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/** File to generate. Defaults bootjava.js in the first non-empty
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package under the classes directory */
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@Parameter
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private File javascript;
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@Parameter(defaultValue="${project}")
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private MavenProject prj;
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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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javascript = new File(findNonEmptyFolder(classes), "bootjava.js");
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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 (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.getDependencyArtifacts());
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FileWriter w = new FileWriter(javascript);
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Bck2Brwsr.generate(w, url, arr.toArray(new String[0]));
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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 File findNonEmptyFolder(File dir) throws MojoExecutionException {
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if (!dir.isDirectory()) {
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throw new MojoExecutionException("Not a directory " + dir);
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}
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File[] arr = dir.listFiles();
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if (arr.length == 1 && arr[0].isDirectory()) {
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return findNonEmptyFolder(arr[0]);
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}
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return dir;
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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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arr.add(prefix.substring(0, prefix.length() - 7));
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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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arr.add(a.getFile().toURI().toURL());
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}
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return new URLClassLoader(arr.toArray(new URL[0]), Bck2BrswrMojo.class.getClassLoader());
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}
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}
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