88 lines
3.3 KiB
Java
88 lines
3.3 KiB
Java
/*
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* Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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import javax.tools.JavaCompiler;
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import javax.tools.StandardJavaFileManager;
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import javax.tools.StandardLocation;
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import javax.tools.ToolProvider;
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import java.io.IOException;
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import java.nio.file.Files;
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import java.nio.file.Path;
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import java.util.Arrays;
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import java.util.Collections;
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import java.util.List;
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import java.util.stream.Collectors;
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/**
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* This class consists exclusively of static utility methods for invoking the
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* java compiler.
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*/
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public final class CompilerUtils {
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private CompilerUtils() { }
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/**
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* Compile all the java sources in {@code <source>/**} to
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* {@code <destination>/**}. The destination directory will be created if
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* it doesn't exist.
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*
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* All warnings/errors emitted by the compiler are output to System.out/err.
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*
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* @return true if the compilation is successful
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*
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* @throws IOException
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* if there is an I/O error scanning the source tree or
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* creating the destination directory
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* @throws UnsupportedOperationException
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* if there is no system java compiler
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*/
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public static boolean compile(Path source, Path destination, String ... options)
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throws IOException
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{
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JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
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if (compiler == null) {
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// no compiler available
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throw new UnsupportedOperationException("Unable to get system java compiler. " +
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"Perhaps, jdk.compiler module is not available.");
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}
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StandardJavaFileManager jfm = compiler.getStandardFileManager(null, null, null);
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List<Path> sources
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= Files.find(source, Integer.MAX_VALUE,
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(file, attrs) -> (file.toString().endsWith(".java")))
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.collect(Collectors.toList());
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Files.createDirectories(destination);
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jfm.setLocation(StandardLocation.CLASS_PATH, Collections.EMPTY_LIST);
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jfm.setLocationFromPaths(StandardLocation.CLASS_OUTPUT,
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Arrays.asList(destination));
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List<String> opts = Arrays.asList(options);
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JavaCompiler.CompilationTask task
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= compiler.getTask(null, jfm, null, opts, null,
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jfm.getJavaFileObjectsFromPaths(sources));
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return task.call();
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}
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}
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