fix issue #1440, #1472: wrap BasedFileManager for jdk9

AUTHORS

@@ -20,6 +20,7 @@ Robbert Jan Grootjans <grootjans@gmail.com>
 Roel Spilker <r.spilker@gmail.com>
 Sander Koning <askoning@gmail.com>
 Szymon Pacanowski <spacanowski@gmail.com>
+Takuya Murakami <tmurakam@tmurakam.org>
 Taiki Sugawara <buzz.taiki@gmail.com>
 Thomas Darimont <thomas.darimont@gmail.com>
 Yun Zhi Lin <yun@yunspace.com>

src/core/lombok/javac/apt/LombokFileObjects.java

@@ -22,16 +22,22 @@
 
 package lombok.javac.apt;
 
+import java.io.IOException;
 import java.lang.reflect.Field;
 import java.lang.reflect.Method;
 import java.net.URI;
+import java.nio.charset.Charset;
 import java.nio.file.Path;
 import java.nio.file.Paths;
+import java.util.Iterator;
+import java.util.Set;
 import java.util.concurrent.atomic.AtomicBoolean;
 
+import javax.tools.FileObject;
 import javax.tools.JavaFileManager;
 import javax.tools.JavaFileObject;
 import javax.tools.JavaFileObject.Kind;
+import javax.tools.StandardLocation;
 
 import lombok.core.DiagnosticsReceiver;
 
@@ -120,6 +126,9 @@ static Compiler getCompiler(JavaFileManager jfm) {
 				Class<?> superType = Class.forName("com.sun.tools.javac.file.BaseFileManager");
 				if (superType.isInstance(wrappedManager)) {
 					return new Java9Compiler(wrappedManager);
+				} else {
+					String encoding = getEncodingOf(wrappedManager);
+					return new Java9Compiler(new BaseFileManagerWrapper(wrappedManager, encoding != null ? Charset.forName(encoding) : null));
 				}
 			}
 			catch (Exception e) {}
@@ -142,6 +151,92 @@ static Compiler getCompiler(JavaFileManager jfm) {
 		}
 		throw new IllegalArgumentException(sb.toString());
 	}
+
+	private static String getEncodingOf(JavaFileManager manager) {
+		try {
+			// FileObject may be instance of org.jetbrains.jps.javac.OutputFileObject
+            FileObject fo = manager.getFileForOutput(StandardLocation.CLASS_OUTPUT, "", "dummy", null);
+            Field encodingField = fo.getClass().getDeclaredField("myEncodingName");
+            encodingField.setAccessible(true);
+            return (String)encodingField.get(fo);
+        } catch (Exception e) {
+            return null;
+        }
+	}
+
+	static class BaseFileManagerWrapper extends BaseFileManager {
+		JavaFileManager manager;
+
+		public BaseFileManagerWrapper(JavaFileManager manager, Charset charset) {
+			super(charset);
+			this.manager = manager;
+		}
+
+		@Override
+		public int isSupportedOption(String option) {
+			return manager.isSupportedOption(option);
+		}
+
+		@Override
+		public ClassLoader getClassLoader(Location location) {
+			return manager.getClassLoader(location);
+		}
+
+		@Override
+		public Iterable<JavaFileObject> list(Location location, String packageName, Set<Kind> kinds, boolean recurse) throws IOException {
+			return manager.list(location, packageName, kinds, recurse);
+		}
+
+		@Override
+		public String inferBinaryName(Location location, JavaFileObject file) {
+			return manager.inferBinaryName(location, file);
+		}
+
+		@Override
+		public boolean isSameFile(FileObject a, FileObject b) {
+			return manager.isSameFile(a, b);
+		}
+
+		@Override
+		public boolean handleOption(String current, Iterator<String> remaining) {
+			return manager.handleOption(current, remaining);
+		}
+
+		@Override
+		public boolean hasLocation(Location location) {
+			return manager.hasLocation(location);
+		}
+
+		@Override
+		public JavaFileObject getJavaFileForInput(Location location, String className, Kind kind) throws IOException {
+			return manager.getJavaFileForInput(location, className, kind);
+		}
+
+		@Override
+		public JavaFileObject getJavaFileForOutput(Location location, String className, Kind kind, FileObject sibling) throws IOException {
+			return manager.getJavaFileForOutput(location, className, kind, sibling);
+		}
+
+		@Override
+		public FileObject getFileForInput(Location location, String packageName, String relativeName) throws IOException {
+			return manager.getFileForInput(location, packageName, relativeName);
+		}
+
+		@Override
+		public FileObject getFileForOutput(Location location, String packageName, String relativeName, FileObject sibling) throws IOException {
+			return manager.getFileForOutput(location, packageName, relativeName, sibling);
+		}
+
+		@Override
+		public void flush() throws IOException {
+			manager.flush();
+		}
+
+		@Override
+		public void close() throws IOException {
+			manager.close();
+		}
+	}
 
 	static JavaFileObject createEmpty(Compiler compiler, String name, Kind kind) {
 		return compiler.wrap(new EmptyLombokFileObject(name, kind));

src/stubs/com/sun/tools/javac/file/BaseFileManager.java

@@ -4,5 +4,8 @@
 package com.sun.tools.javac.file;
 
 import javax.tools.JavaFileManager;
+import java.nio.charset.Charset;
 
-public abstract class BaseFileManager implements JavaFileManager{}
+public abstract class BaseFileManager implements JavaFileManager {
+    protected BaseFileManager(Charset charset) {}
+}