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/*
* 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);
}
}
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