8156680: jdeps implementation refresh

Reviewed-by: dfuchs

langtools/test/tools/jdeps/lib/CompilerUtils.java

@@ -0,0 +1,139 @@
+/*
+ * 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[] {
+            "-modulesourcepath", 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);
+    }
+}