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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.aot;
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import java.io.BufferedReader;
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import java.io.File;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.InputStreamReader;
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import java.net.URL;
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import java.util.ArrayList;
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import java.util.Enumeration;
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import java.util.HashSet;
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import java.util.List;
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import java.util.Set;
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import java.util.jar.JarEntry;
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import java.util.jar.JarFile;
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import java.util.logging.Level;
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import java.util.logging.Logger;
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import java.util.zip.ZipEntry;
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import org.apidesign.vm4brwsr.Bck2Brwsr;
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/** Utilities to process JAR files and set a compiler
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* up.
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*
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* @since 0.9
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* @author Jaroslav Tulach
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*/
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public final class Bck2BrwsrJars {
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private static final Logger LOG = Logger.getLogger(Bck2BrwsrJars.class.getName());
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private Bck2BrwsrJars() {
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}
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/** Creates new compiler pre-configured from the content of
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* provided JAR file. The compiler will compile all classes.
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* The system understands OSGi manifest entries and will export
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* all packages that are exported in the JAR file. The system
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* also recognizes META-INF/services and makes sure the file names
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* are not mangled.
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*
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* @param c the compiler to {@link Bck2Brwsr#addClasses(java.lang.String...) add classes},
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* {@link Bck2Brwsr#addResources(java.lang.String...) add resources} and
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* {@link Bck2Brwsr#addExported(java.lang.String...) exported objects} to.
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* Can be <code>null</code> - in such case an
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* {@link Bck2Brwsr#newCompiler() empty compiler} is constructed.
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* @param jar the file to process
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* @return newly configured compiler
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* @throws IOException if something goes wrong
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*/
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public static Bck2Brwsr configureFrom(Bck2Brwsr c, File jar) throws IOException {
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final JarFile jf = new JarFile(jar);
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List<String> classes = new ArrayList<>();
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List<String> resources = new ArrayList<>();
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Set<String> exported = new HashSet<>();
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listJAR(jf, classes, resources, exported);
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String cp = jf.getManifest().getMainAttributes().getValue("Class-Path"); // NOI18N
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String[] classpath = cp == null ? new String[0] : cp.split(" ");
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class JarRes extends EmulationResources implements Bck2Brwsr.Resources {
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@Override
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public InputStream get(String resource) throws IOException {
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InputStream is = jf.getInputStream(new ZipEntry(resource));
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return is == null ? super.get(resource) : is;
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}
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}
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return Bck2Brwsr.newCompiler()
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.library(classpath)
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.addClasses(classes.toArray(new String[classes.size()]))
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.addExported(exported.toArray(new String[exported.size()]))
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.addResources(resources.toArray(new String[resources.size()]))
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.resources(new JarRes());
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}
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private static void listJAR(
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JarFile j, List<String> classes,
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List<String> resources, Set<String> keep
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) throws IOException {
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Enumeration<JarEntry> en = j.entries();
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while (en.hasMoreElements()) {
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JarEntry e = en.nextElement();
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final String n = e.getName();
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if (n.endsWith("/")) {
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continue;
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}
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if (n.startsWith("META-INF/maven/")) {
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continue;
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}
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int last = n.lastIndexOf('/');
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String pkg = n.substring(0, last + 1);
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if (pkg.startsWith("java/")) {
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keep.add(pkg);
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}
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if (n.endsWith(".class")) {
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classes.add(n.substring(0, n.length() - 6));
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} else {
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resources.add(n);
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if (n.startsWith("META-INF/services/") && keep != null) {
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BufferedReader r = new BufferedReader(new InputStreamReader(j.getInputStream(e)));
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for (;;) {
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String l = r.readLine();
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if (l == null) {
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break;
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}
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if (l.startsWith("#")) {
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continue;
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}
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keep.add(l.replace('.', '/'));
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}
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}
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}
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}
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String exp = j.getManifest().getMainAttributes().getValue("Export-Package");
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if (exp != null && keep != null) {
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for (String def : exp.split(",")) {
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for (String sep : def.split(";")) {
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keep.add(sep.replace('.', '/') + "/");
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break;
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}
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}
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}
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}
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static class EmulationResources implements Bck2Brwsr.Resources {
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@Override
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public InputStream get(String name) throws IOException {
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Enumeration<URL> en = Bck2BrwsrJars.class.getClassLoader().getResources(name);
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URL u = null;
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while (en.hasMoreElements()) {
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u = en.nextElement();
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}
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if (u == null) {
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LOG.log(Level.WARNING, "Cannot find {0}", name);
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return null;
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}
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if (u.toExternalForm().contains("/rt.jar!")) {
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LOG.log(Level.WARNING, "{0}No bootdelegation for ", name);
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return null;
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}
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return u.openStream();
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}
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}
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}
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