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122 lines
4.6 KiB
C++
122 lines
4.6 KiB
C++
// Protocol Buffers - Google's data interchange format
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// Copyright 2008 Google Inc. All rights reserved.
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// https://developers.google.com/protocol-buffers/
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#ifndef GOOGLE_PROTOBUF_UTIL_INTERNAL_STRUCTURED_OBJECTWRITER_H__
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#define GOOGLE_PROTOBUF_UTIL_INTERNAL_STRUCTURED_OBJECTWRITER_H__
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#include <memory>
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#include <thirdparty/protobuf/stubs/casts.h>
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#include <thirdparty/protobuf/stubs/common.h>
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#include <thirdparty/protobuf/util/internal/object_writer.h>
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// Must be included last.
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#include <thirdparty/protobuf/port_def.inc>
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namespace google {
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namespace protobuf {
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namespace util {
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namespace converter {
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// An StructuredObjectWriter is an ObjectWriter for writing
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// tree-structured data in a stream of events representing objects
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// and collections. Implementation of this interface can be used to
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// write an object stream to an in-memory structure, protobufs,
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// JSON, XML, or any other output format desired. The ObjectSource
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// interface is typically used as the source of an object stream.
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//
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// See JsonObjectWriter for a sample implementation of
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// StructuredObjectWriter and its use.
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//
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// Derived classes could be thread-unsafe.
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class PROTOBUF_EXPORT StructuredObjectWriter : public ObjectWriter {
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public:
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~StructuredObjectWriter() override {}
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protected:
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// A base element class for subclasses to extend, makes tracking state easier.
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//
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// StructuredObjectWriter behaves as a visitor. BaseElement represents a node
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// in the input tree. Implementation of StructuredObjectWriter should also
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// extend BaseElement to keep track of the location in the input tree.
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class PROTOBUF_EXPORT BaseElement {
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public:
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// Takes ownership of the parent Element.
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explicit BaseElement(BaseElement* parent)
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: parent_(parent),
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level_(parent == nullptr ? 0 : parent->level() + 1) {}
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virtual ~BaseElement() {}
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// Releases ownership of the parent and returns a pointer to it.
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template <typename ElementType>
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ElementType* pop() {
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return down_cast<ElementType*>(parent_.release());
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}
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// Returns true if this element is the root.
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bool is_root() const { return parent_ == nullptr; }
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// Returns the number of hops from this element to the root element.
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int level() const { return level_; }
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protected:
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// Returns pointer to parent element without releasing ownership.
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virtual BaseElement* parent() const { return parent_.get(); }
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private:
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// Pointer to the parent Element.
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std::unique_ptr<BaseElement> parent_;
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// Number of hops to the root Element.
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// The root Element has nullptr parent_ and a level_ of 0.
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const int level_;
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GOOGLE_DISALLOW_IMPLICIT_CONSTRUCTORS(BaseElement);
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};
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StructuredObjectWriter() {}
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// Returns the current element. Used for indentation and name overrides.
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virtual BaseElement* element() = 0;
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private:
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// Do not add any data members to this class.
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GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(StructuredObjectWriter);
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};
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} // namespace converter
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} // namespace util
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} // namespace protobuf
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} // namespace google
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#include <thirdparty/protobuf/port_undef.inc>
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#endif // GOOGLE_PROTOBUF_UTIL_INTERNAL_STRUCTURED_OBJECTWRITER_H__
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