1 /*
   2  * Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 package jdk.test.lib.compiler;
  25 
  26 import javax.tools.JavaCompiler;
  27 import javax.tools.StandardJavaFileManager;
  28 import javax.tools.StandardLocation;
  29 import javax.tools.ToolProvider;
  30 import java.io.IOException;
  31 import java.nio.file.Files;
  32 import java.nio.file.Path;
  33 import java.util.Arrays;
  34 import java.util.Collections;
  35 import java.util.List;
  36 import java.util.stream.Collectors;
  37 
  38 /**
  39  * This class consists exclusively of static utility methods for invoking the
  40  * java compiler.
  41  */
  42 public final class CompilerUtils {
  43     private CompilerUtils() { }
  44 
  45     /**
  46      * Compile all the java sources in {@code <source>/**} to
  47      * {@code <destination>/**}. The destination directory will be created if
  48      * it doesn't exist.
  49      *
  50      * All warnings/errors emitted by the compiler are output to System.out/err.
  51      *
  52      * @return true if the compilation is successful
  53      *
  54      * @throws IOException
  55      *         if there is an I/O error scanning the source tree or
  56      *         creating the destination directory
  57      * @throws UnsupportedOperationException
  58      *         if there is no system java compiler
  59      */
  60     public static boolean compile(Path source, Path destination, String... options)
  61         throws IOException
  62     {
  63         JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
  64         if (compiler == null) {
  65             // no compiler available
  66             throw new UnsupportedOperationException("Unable to get system java compiler. "
  67                     + "Perhaps, jdk.compiler module is not available.");
  68         }
  69         StandardJavaFileManager jfm = compiler.getStandardFileManager(null, null, null);
  70 
  71         List<Path> sources
  72             = Files.find(source, Integer.MAX_VALUE,
  73                 (file, attrs) -> (file.toString().endsWith(".java")))
  74                 .collect(Collectors.toList());
  75 
  76         Files.createDirectories(destination);
  77         jfm.setLocation(StandardLocation.CLASS_PATH, Collections.emptyList());
  78         jfm.setLocationFromPaths(StandardLocation.CLASS_OUTPUT,
  79                 Collections.singletonList(destination));
  80 
  81         List<String> opts = Arrays.asList(options);
  82         JavaCompiler.CompilationTask task
  83             = compiler.getTask(null, jfm, null, opts, null,
  84                 jfm.getJavaFileObjectsFromPaths(sources));
  85 
  86         return task.call();
  87     }
  88 }