| /* |
| * Copyright (c) 2015, 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.nio.file.Files; |
| import java.nio.file.Path; |
| import java.util.Arrays; |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.stream.Collectors; |
| |
| /** |
| * This class consists exclusively of static utility methods for invoking the |
| * java compiler. |
| */ |
| |
| 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 |
| * @throws UnsupportedOperationException |
| * if there is no system java compiler |
| */ |
| public static boolean compile(Path source, Path destination, String ... options) |
| throws IOException |
| { |
| JavaCompiler compiler = ToolProvider.getSystemJavaCompiler(); |
| if (compiler == null) { |
| // no compiler available |
| throw new UnsupportedOperationException("Unable to get system java compiler. " + |
| "Perhaps, jdk.compiler module is not available."); |
| } |
| 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.setLocation(StandardLocation.CLASS_PATH, Collections.EMPTY_LIST); |
| 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(); |
| } |
| } |