Down-integrate from internal code base.

1 files changed, 310 insertions, 0 deletions

diff --git a/src/google/protobuf/reflection_internal.h b/src/google/protobuf/reflection_internal.h
new file mode 100644
index 00000000..e25e193c
--- /dev/null
+++ b/src/google/protobuf/reflection_internal.h
@@ -0,0 +1,310 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// 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.
+
+#ifndef GOOGLE_PROTOBUF_REFLECTION_INTERNAL_H__
+#define GOOGLE_PROTOBUF_REFLECTION_INTERNAL_H__
+
+#include <google/protobuf/reflection.h>
+#include <google/protobuf/repeated_field.h>
+
+namespace google {
+namespace protobuf {
+namespace internal {
+// A base class for RepeatedFieldAccessor implementations that can support
+// random-access efficiently. All iterator methods delegates the work to
+// corresponding random-access methods.
+class RandomAccessRepeatedFieldAccessor : public RepeatedFieldAccessor {
+ public:
+  virtual ~RandomAccessRepeatedFieldAccessor() {}
+
+  virtual Iterator* BeginIterator(const Field* data) const {
+    return PositionToIterator(0);
+  }
+  virtual Iterator* EndIterator(const Field* data) const {
+    return PositionToIterator(this->Size(data));
+  }
+  virtual Iterator* CopyIterator(const Field* data,
+                                 const Iterator* iterator) const {
+    return const_cast<Iterator*>(iterator);
+  }
+  virtual Iterator* AdvanceIterator(const Field* data,
+                                    Iterator* iterator) const {
+    return PositionToIterator(IteratorToPosition(iterator) + 1);
+  }
+  virtual bool EqualsIterator(const Field* data,
+                              const Iterator* a,
+                              const Iterator* b) const {
+    return a == b;
+  }
+  virtual void DeleteIterator(const Field* data, Iterator* iterator) const {
+  }
+  virtual const Value* GetIteratorValue(const Field* data,
+                                        const Iterator* iterator,
+                                        Value* scratch_space) const {
+    return Get(data, static_cast<int>(IteratorToPosition(iterator)),
+               scratch_space);
+  }
+
+ private:
+  static intptr_t IteratorToPosition(const Iterator* iterator) {
+    return reinterpret_cast<intptr_t>(iterator);
+  }
+  static Iterator* PositionToIterator(intptr_t position) {
+    return reinterpret_cast<Iterator*>(position);
+  }
+};
+
+// Base class for RepeatedFieldAccessor implementations that manipulates
+// RepeatedField<T>.
+template<typename T>
+class RepeatedFieldWrapper : public RandomAccessRepeatedFieldAccessor {
+ public:
+  RepeatedFieldWrapper() {}
+  virtual ~RepeatedFieldWrapper() {}
+  virtual bool IsEmpty(const Field* data) const {
+    return GetRepeatedField(data)->empty();
+  }
+  virtual int Size(const Field* data) const {
+    return GetRepeatedField(data)->size();
+  }
+  virtual const Value* Get(const Field* data, int index,
+                          Value* scratch_space) const {
+    return ConvertFromT(GetRepeatedField(data)->Get(index), scratch_space);
+  }
+  virtual void Clear(Field* data) const {
+    MutableRepeatedField(data)->Clear();
+  }
+  virtual void Set(Field* data, int index, const Value* value) const {
+    MutableRepeatedField(data)->Set(index, ConvertToT(value));
+  }
+  virtual void Add(Field* data, const Value* value) const {
+    MutableRepeatedField(data)->Add(ConvertToT(value));
+  }
+  virtual void RemoveLast(Field* data) const {
+    MutableRepeatedField(data)->RemoveLast();
+  }
+  virtual void SwapElements(Field* data, int index1, int index2) const {
+    MutableRepeatedField(data)->SwapElements(index1, index2);
+  }
+
+ protected:
+  typedef RepeatedField<T> RepeatedFieldType;
+  static const RepeatedFieldType* GetRepeatedField(const Field* data) {
+    return reinterpret_cast<const RepeatedFieldType*>(data);
+  }
+  static RepeatedFieldType* MutableRepeatedField(Field* data) {
+    return reinterpret_cast<RepeatedFieldType*>(data);
+  }
+
+  // Convert an object recevied by this accessor to an object to be stored in
+  // the underlying RepeatedField.
+  virtual T ConvertToT(const Value* value) const = 0;
+
+  // Convert an object stored in RepeatedPtrField to an object that will be
+  // returned by this accessor. If the two objects have the same type (true
+  // for string fields with ctype=STRING), a pointer to the source object can
+  // be returned directly. Otherwise, data should be copied from value to
+  // scratch_space and scratch_space should be returned.
+  virtual const Value* ConvertFromT(const T& value,
+                                    Value* scratch_space) const = 0;
+};
+
+// Base class for RepeatedFieldAccessor implementations that manipulates
+// RepeatedPtrField<T>.
+template<typename T>
+class RepeatedPtrFieldWrapper : public RandomAccessRepeatedFieldAccessor {
+ public:
+  RepeatedPtrFieldWrapper() {}
+  virtual ~RepeatedPtrFieldWrapper() {}
+  virtual bool IsEmpty(const Field* data) const {
+    return GetRepeatedField(data)->empty();
+  }
+  virtual int Size(const Field* data) const {
+    return GetRepeatedField(data)->size();
+  }
+  virtual const Value* Get(const Field* data, int index,
+                           Value* scratch_space) const {
+    return ConvertFromT(GetRepeatedField(data)->Get(index), scratch_space);
+  }
+  virtual void Clear(Field* data) const {
+    MutableRepeatedField(data)->Clear();
+  }
+  virtual void Set(Field* data, int index, const Value* value) const {
+    ConvertToT(value, MutableRepeatedField(data)->Mutable(index));
+  }
+  virtual void Add(Field* data, const Value* value) const {
+    T* allocated = New(value);
+    ConvertToT(value, allocated);
+    MutableRepeatedField(data)->AddAllocated(allocated);
+  }
+  virtual void RemoveLast(Field* data) const {
+    MutableRepeatedField(data)->RemoveLast();
+  }
+  virtual void SwapElements(Field* data, int index1, int index2) const {
+    MutableRepeatedField(data)->SwapElements(index1, index2);
+  }
+
+ protected:
+  typedef RepeatedPtrField<T> RepeatedFieldType;
+  static const RepeatedFieldType* GetRepeatedField(const Field* data) {
+    return reinterpret_cast<const RepeatedFieldType*>(data);
+  }
+  static RepeatedFieldType* MutableRepeatedField(Field* data) {
+    return reinterpret_cast<RepeatedFieldType*>(data);
+  }
+
+  // Create a new T instance. For repeated message fields, T can be specified
+  // as google::protobuf::Message so we can't use "new T()" directly. In that case, value
+  // should be a message of the same type (it's ensured by the caller) and a
+  // new message object will be created using it.
+  virtual T* New(const Value* value) const = 0;
+
+  // Convert an object received by this accessor to an object that will be
+  // stored in the underlying RepeatedPtrField.
+  virtual void ConvertToT(const Value* value, T* result) const = 0;
+
+  // Convert an object stored in RepeatedPtrField to an object that will be
+  // returned by this accessor. If the two objects have the same type (true
+  // for string fields with ctype=STRING), a pointer to the source object can
+  // be returned directly. Otherwise, data should be copied from value to
+  // scratch_space and scratch_space should be returned.
+  virtual const Value* ConvertFromT(const T& value,
+                                    Value* scratch_space) const = 0;
+};
+
+// Default implementations of RepeatedFieldAccessor for primitive types.
+template<typename T>
+class RepeatedFieldPrimitiveAccessor : public RepeatedFieldWrapper<T> {
+  typedef void Field;
+  typedef void Value;
+  using RepeatedFieldWrapper<T>::MutableRepeatedField;
+
+ public:
+  RepeatedFieldPrimitiveAccessor() {}
+  virtual ~RepeatedFieldPrimitiveAccessor() {}
+  virtual void Swap(
+      Field* data,
+      const internal::RepeatedFieldAccessor* other_mutator,
+      Field* other_data) const {
+    // Currently RepeatedFieldPrimitiveAccessor is the only implementation of
+    // RepeatedFieldAccessor for primitive types. As we are using singletons
+    // for these accessors, here "other_mutator" must be "this".
+    GOOGLE_CHECK(this == other_mutator);
+    MutableRepeatedField(data)->Swap(MutableRepeatedField(other_data));
+  }
+
+ protected:
+  virtual T ConvertToT(const Value* value) const {
+    return *static_cast<const T*>(value);
+  }
+  virtual const Value* ConvertFromT(const T& value,
+                                    Value* scratch_space) const {
+    return static_cast<const Value*>(&value);
+  }
+};
+
+// Default implementation of RepeatedFieldAccessor for string fields with
+// ctype=STRING.
+class RepeatedPtrFieldStringAccessor : public RepeatedPtrFieldWrapper<string> {
+  typedef void Field;
+  typedef void Value;
+  using RepeatedFieldAccessor::Add;
+
+ public:
+  RepeatedPtrFieldStringAccessor() {}
+  virtual ~RepeatedPtrFieldStringAccessor() {}
+  virtual void Swap(
+      Field* data,
+      const internal::RepeatedFieldAccessor* other_mutator,
+      Field* other_data) const {
+    if (this == other_mutator) {
+      MutableRepeatedField(data)->Swap(MutableRepeatedField(other_data));
+    } else {
+      RepeatedPtrField<string> tmp;
+      tmp.Swap(MutableRepeatedField(data));
+      int other_size = other_mutator->Size(other_data);
+      for (int i = 0; i < other_size; ++i) {
+        Add<string>(data, other_mutator->Get<string>(other_data, i));
+      }
+      int size = Size(data);
+      other_mutator->Clear(other_data);
+      for (int i = 0; i < size; ++i) {
+        other_mutator->Add<string>(other_data, tmp.Get(i));
+      }
+    }
+  }
+
+ protected:
+  virtual string* New(const Value*) const {
+    return new string();
+  }
+  virtual void ConvertToT(const Value* value, string* result) const {
+    *result = *static_cast<const string*>(value);
+  }
+  virtual const Value* ConvertFromT(const string& value,
+                                    Value* scratch_space) const {
+    return static_cast<const Value*>(&value);
+  }
+};
+
+
+class RepeatedPtrFieldMessageAccessor
+    : public RepeatedPtrFieldWrapper<Message> {
+  typedef void Field;
+  typedef void Value;
+
+ public:
+  RepeatedPtrFieldMessageAccessor() {}
+  virtual ~RepeatedPtrFieldMessageAccessor() {}
+  virtual void Swap(
+      Field* data,
+      const internal::RepeatedFieldAccessor* other_mutator,
+      Field* other_data) const {
+    GOOGLE_CHECK(this == other_mutator);
+    MutableRepeatedField(data)->Swap(MutableRepeatedField(other_data));
+  }
+
+ protected:
+  virtual Message* New(const Value* value) const {
+    return static_cast<const Message*>(value)->New();
+  }
+  virtual void ConvertToT(const Value* value, Message* result) const {
+    result->CopyFrom(*static_cast<const Message*>(value));
+  }
+  virtual const Value* ConvertFromT(const Message& value,
+                                    Value* scratch_space) const {
+    return static_cast<const Value*>(&value);
+  }
+};
+}  // namespace internal
+}  // namespace protobuf
+
+}  // namespace google
+#endif  // GOOGLE_PROTOBUF_REFLECTION_INTERNAL_H__