Made an API for creating a (oracle javac) JavaCompiler which tracks comments on a per Compilation Unit basis. The old way involved making reflective calls and detecting whether you need the 1.6 or the 1.7 variant to do this. These shenanigans are now hidden behind a nice API (lombok.javac.CommentCatcher).

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diff --git a/src/utils/lombok/javac/CommentCatcher.java b/src/utils/lombok/javac/CommentCatcher.java
new file mode 100644
index 00000000..3bd64ec7
--- /dev/null
+++ b/src/utils/lombok/javac/CommentCatcher.java
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+/*
+ * Copyright (C) 2011 The Project Lombok Authors.
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+package lombok.javac;
+
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+import java.util.WeakHashMap;
+
+import com.sun.tools.javac.main.JavaCompiler;
+import com.sun.tools.javac.tree.JCTree.JCCompilationUnit;
+import com.sun.tools.javac.util.Context;
+
+public class CommentCatcher {
+	private final JavaCompiler compiler;
+	private final Map<JCCompilationUnit, List<Comment>> commentsMap;
+	
+	public static CommentCatcher create(Context context) {
+		registerCommentsCollectingScannerFactory(context);
+		JavaCompiler compiler = new JavaCompiler(context);
+		
+		Map<JCCompilationUnit, List<Comment>> commentsMap = new WeakHashMap<JCCompilationUnit, List<Comment>>();
+		setInCompiler(compiler, context, commentsMap);
+		
+		compiler.keepComments = true;
+		compiler.genEndPos = true;
+		
+		return new CommentCatcher(compiler, commentsMap);
+	}
+	
+	private CommentCatcher(JavaCompiler compiler, Map<JCCompilationUnit, List<Comment>> commentsMap) {
+		this.compiler = compiler;
+		this.commentsMap = commentsMap;
+	}
+	
+	public JavaCompiler getCompiler() {
+		return compiler;
+	}
+	
+	public List<Comment> getComments(JCCompilationUnit ast) {
+		List<Comment> list = commentsMap.get(ast);
+		return list == null ? Collections.<Comment>emptyList() : list;
+	}
+	
+	private static void registerCommentsCollectingScannerFactory(Context context) {
+		try {
+			if (JavaCompiler.version().startsWith("1.6")) {
+				Class.forName("lombok.javac.java6.CommentCollectingScannerFactory").getMethod("preRegister", Context.class).invoke(null, context);
+			} else {
+				Class.forName("lombok.javac.java7.CommentCollectingScannerFactory").getMethod("preRegister", Context.class).invoke(null, context);
+			}
+		} catch (Exception e) {
+			if (e instanceof RuntimeException) throw (RuntimeException)e;
+			throw new RuntimeException(e);
+		}
+	}
+	
+	private static void setInCompiler(JavaCompiler compiler, Context context, Map<JCCompilationUnit, List<Comment>> commentsMap) {
+		
+		try {
+			if (JavaCompiler.version().startsWith("1.6")) {
+				Class<?> parserFactory = Class.forName("lombok.javac.java6.CommentCollectingParserFactory");
+				parserFactory.getMethod("setInCompiler",JavaCompiler.class, Context.class, Map.class).invoke(null, compiler, context, commentsMap);
+			} else {
+				Class<?> parserFactory = Class.forName("lombok.javac.java7.CommentCollectingParserFactory");
+				parserFactory.getMethod("setInCompiler",JavaCompiler.class, Context.class, Map.class).invoke(null, compiler, context, commentsMap);
+			}
+		} catch (Exception e) {
+			if (e instanceof RuntimeException) throw (RuntimeException)e;
+			throw new RuntimeException(e);
+		}
+	}
+	
+}