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diff --git a/src/google/protobuf/compiler/javamicro/javamicro_field.cc b/src/google/protobuf/compiler/javamicro/javamicro_field.cc
new file mode 100644
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+++ b/src/google/protobuf/compiler/javamicro/javamicro_field.cc
@@ -0,0 +1,102 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// http://code.google.com/p/protobuf/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: kenton@google.com (Kenton Varda)
+//  Based on original Protocol Buffers design by
+//  Sanjay Ghemawat, Jeff Dean, and others.
+
+#include <google/protobuf/compiler/javamicro/javamicro_field.h>
+#include <google/protobuf/compiler/javamicro/javamicro_helpers.h>
+#include <google/protobuf/compiler/javamicro/javamicro_primitive_field.h>
+#include <google/protobuf/compiler/javamicro/javamicro_enum_field.h>
+#include <google/protobuf/compiler/javamicro/javamicro_message_field.h>
+#include <google/protobuf/stubs/common.h>
+
+namespace google {
+namespace protobuf {
+namespace compiler {
+namespace javamicro {
+
+FieldGenerator::~FieldGenerator() {}
+
+FieldGeneratorMap::FieldGeneratorMap(const Descriptor* descriptor, const Params &params)
+  : descriptor_(descriptor),
+    field_generators_(
+      new scoped_ptr<FieldGenerator>[descriptor->field_count()]),
+    extension_generators_(
+      new scoped_ptr<FieldGenerator>[descriptor->extension_count()]) {
+
+  // Construct all the FieldGenerators.
+  for (int i = 0; i < descriptor->field_count(); i++) {
+    field_generators_[i].reset(MakeGenerator(descriptor->field(i), params));
+  }
+  for (int i = 0; i < descriptor->extension_count(); i++) {
+    extension_generators_[i].reset(MakeGenerator(descriptor->extension(i), params));
+  }
+}
+
+FieldGenerator* FieldGeneratorMap::MakeGenerator(const FieldDescriptor* field, const Params &params) {
+  if (field->is_repeated()) {
+    switch (GetJavaType(field)) {
+      case JAVATYPE_MESSAGE:
+        return new RepeatedMessageFieldGenerator(field, params);
+      case JAVATYPE_ENUM:
+        return new RepeatedEnumFieldGenerator(field, params);
+      default:
+        return new RepeatedPrimitiveFieldGenerator(field, params);
+    }
+  } else {
+    switch (GetJavaType(field)) {
+      case JAVATYPE_MESSAGE:
+        return new MessageFieldGenerator(field, params);
+      case JAVATYPE_ENUM:
+        return new EnumFieldGenerator(field, params);
+      default:
+        return new PrimitiveFieldGenerator(field, params);
+    }
+  }
+}
+
+FieldGeneratorMap::~FieldGeneratorMap() {}
+
+const FieldGenerator& FieldGeneratorMap::get(
+    const FieldDescriptor* field) const {
+  GOOGLE_CHECK_EQ(field->containing_type(), descriptor_);
+  return *field_generators_[field->index()];
+}
+
+const FieldGenerator& FieldGeneratorMap::get_extension(int index) const {
+  return *extension_generators_[index];
+}
+
+}  // namespace javamicro
+}  // namespace compiler
+}  // namespace protobuf
+}  // namespace google