/* * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ import javax.tools.JavaCompiler; import javax.tools.StandardJavaFileManager; import javax.tools.StandardLocation; import javax.tools.ToolProvider; import java.io.IOException; import java.io.UncheckedIOException; import java.nio.file.FileVisitResult; import java.nio.file.Files; import java.nio.file.Path; import java.nio.file.SimpleFileVisitor; import java.nio.file.attribute.BasicFileAttributes; import java.util.ArrayList; import java.util.Arrays; import java.util.List; import java.util.stream.Collectors; import java.util.stream.Stream; public final class CompilerUtils { private CompilerUtils() { } /** * Compile all the java sources in {@code <source>/**} to * {@code <destination>/**}. The destination directory will be created if * it doesn't exist. * * All warnings/errors emitted by the compiler are output to System.out/err. * * @return true if the compilation is successful * * @throws IOException if there is an I/O error scanning the source tree or * creating the destination directory */ public static boolean compile(Path source, Path destination, String... options) throws IOException { JavaCompiler compiler = ToolProvider.getSystemJavaCompiler(); StandardJavaFileManager jfm = compiler.getStandardFileManager(null, null, null); List<Path> sources = Files.find(source, Integer.MAX_VALUE, (file, attrs) -> (file.toString().endsWith(".java"))) .collect(Collectors.toList()); Files.createDirectories(destination); jfm.setLocationFromPaths(StandardLocation.CLASS_OUTPUT, Arrays.asList(destination)); List<String> opts = Arrays.asList(options); JavaCompiler.CompilationTask task = compiler.getTask(null, jfm, null, opts, null, jfm.getJavaFileObjectsFromPaths(sources)); return task.call(); } /** * Compile the specified module from the given module sourcepath * * All warnings/errors emitted by the compiler are output to System.out/err. * * @return true if the compilation is successful * * @throws IOException if there is an I/O error scanning the source tree or * creating the destination directory */ public static boolean compileModule(Path source, Path destination, String moduleName, String... options) { JavaCompiler compiler = ToolProvider.getSystemJavaCompiler(); StandardJavaFileManager jfm = compiler.getStandardFileManager(null, null, null); try { Files.createDirectories(destination); jfm.setLocationFromPaths(StandardLocation.CLASS_OUTPUT, Arrays.asList(destination)); } catch (IOException e) { throw new UncheckedIOException(e); } Stream<String> opts = Arrays.stream(new String[] { "--module-source-path", source.toString(), "-m", moduleName }); List<String> javacOpts = Stream.concat(opts, Arrays.stream(options)) .collect(Collectors.toList()); JavaCompiler.CompilationTask task = compiler.getTask(null, jfm, null, javacOpts, null, null); return task.call(); } public static void cleanDir(Path dir) throws IOException { if (Files.notExists(dir)) return; Files.walkFileTree(dir, new SimpleFileVisitor<Path>() { @Override public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException { Files.delete(file); return FileVisitResult.CONTINUE; } @Override public FileVisitResult postVisitDirectory(Path dir, IOException e) throws IOException { if (e == null) { Files.delete(dir); return FileVisitResult.CONTINUE; } else { // directory iteration failed throw e; } } }); Files.deleteIfExists(dir); } }