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diff --git a/tools/aapt2/java/AnnotationProcessor.h b/tools/aapt2/java/AnnotationProcessor.h
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+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef AAPT_JAVA_ANNOTATIONPROCESSOR_H
+#define AAPT_JAVA_ANNOTATIONPROCESSOR_H
+
+#include "util/StringPiece.h"
+
+#include <sstream>
+#include <string>
+
+namespace aapt {
+
+/**
+ * Builds a JavaDoc comment from a set of XML comments.
+ * This will also look for instances of @SystemApi and convert them to
+ * actual Java annotations.
+ *
+ * Example:
+ *
+ * Input XML:
+ *
+ * <!-- This is meant to be hidden because
+ *      It is system api. Also it is @deprecated
+ *      @SystemApi
+ *      -->
+ *
+ * Output JavaDoc:
+ *
+ *  /\*
+ *   * This is meant to be hidden because
+ *   * It is system api. Also it is @deprecated
+ *   * @SystemApi
+ *   *\/
+ *
+ * Output Annotations:
+ *
+ * @Deprecated
+ * @android.annotation.SystemApi
+ *
+ */
+class AnnotationProcessor {
+public:
+    /**
+     * Adds more comments. Since resources can have various values with different configurations,
+     * we need to collect all the comments.
+     */
+    void appendComment(const StringPiece16& comment);
+    void appendComment(const StringPiece& comment);
+
+    /**
+     * Writes the comments and annotations to the stream, with the given prefix before each line.
+     */
+    void writeToStream(std::ostream* out, const StringPiece& prefix);
+
+private:
+    enum : uint32_t {
+        kDeprecated = 0x01,
+        kSystemApi = 0x02,
+    };
+
+    std::stringstream mComment;
+    std::stringstream mAnnotations;
+    bool mHasComments = false;
+    uint32_t mAnnotationBitMask = 0;
+
+    void appendCommentLine(const std::string& line);
+};
+
+} // namespace aapt
+
+#endif /* AAPT_JAVA_ANNOTATIONPROCESSOR_H */