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 
  43 public final class CompilerUtils {
  44     private CompilerUtils() { }
  45 
  46     /**
  47      * Compile all the java sources in {@code <source>/**} to
  48      * {@code <destination>/**}. The destination directory will be created if
  49      * it doesn't exist.
  50      *
  51      * All warnings/errors emitted by the compiler are output to System.out/err.
  52      *
  53      * @return true if the compilation is successful
  54      *
  55      * @throws IOException if there is an I/O error scanning the source tree or
  56      *                     creating the destination directory
  57      */
  58     public static boolean compile(Path source, Path destination, String ... options)
  59         throws IOException
  60     {
  61         JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
  62         StandardJavaFileManager jfm = compiler.getStandardFileManager(null, null, null);
  63 
  64         List<Path> sources
  65             = Files.find(source, Integer.MAX_VALUE,
  66                 (file, attrs) -> (file.toString().endsWith(".java")))
  67                 .collect(Collectors.toList());
  68 
  69         Files.createDirectories(destination);
  70         jfm.setLocation(StandardLocation.CLASS_PATH, Collections.emptyList());
  71         jfm.setLocationFromPaths(StandardLocation.CLASS_OUTPUT,
  72                 Collections.singletonList(destination));
  73 
  74         List<String> opts = Arrays.asList(options);
  75         JavaCompiler.CompilationTask task
  76             = compiler.getTask(null, jfm, null, opts, null,
  77                 jfm.getJavaFileObjectsFromPaths(sources));
  78 
  79         return task.call();
  80     }
  81 }