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375 lines
6.9 KiB
C++
375 lines
6.9 KiB
C++
//
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// Element.h
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//
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// $Id$
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//
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// Library: MongoDB
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// Package: MongoDB
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// Module: Element
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//
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// Definition of the Element class.
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//
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// Copyright (c) 2012, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// Permission is hereby granted, free of charge, to any person or organization
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// obtaining a copy of the software and accompanying documentation covered by
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// this license (the "Software") to use, reproduce, display, distribute,
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// execute, and transmit the Software, and to prepare derivative works of the
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// Software, and to permit third-parties to whom the Software is furnished to
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// do so, all subject to the following:
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//
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// The copyright notices in the Software and this entire statement, including
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// the above license grant, this restriction and the following disclaimer,
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// must be included in all copies of the Software, in whole or in part, and
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// all derivative works of the Software, unless such copies or derivative
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// works are solely in the form of machine-executable object code generated by
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// a source language processor.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
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// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
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// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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//
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#ifndef MongoDB_Element_INCLUDED
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#define MongoDB_Element_INCLUDED
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#include <string>
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#include <sstream>
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#include <iomanip>
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#include <set>
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#include "Poco/BinaryReader.h"
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#include "Poco/BinaryWriter.h"
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#include "Poco/SharedPtr.h"
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#include "Poco/Timestamp.h"
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#include "Poco/Nullable.h"
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#include "Poco/NumberFormatter.h"
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#include "Poco/DateTimeFormatter.h"
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#include "Poco/MongoDB/MongoDB.h"
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#include "Poco/MongoDB/BSONReader.h"
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#include "Poco/MongoDB/BSONWriter.h"
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namespace Poco {
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namespace MongoDB {
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class MongoDB_API Element
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/// Represents an element of a Document or an Array
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{
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public:
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typedef Poco::SharedPtr<Element> Ptr;
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Element(const std::string& name);
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/// Constructor
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virtual ~Element();
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/// Destructor
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std::string name() const;
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/// Returns the name of the element
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virtual std::string toString(int indent = 0) const = 0;
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/// Returns a string representation of the element.
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virtual int type() const = 0;
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/// Returns the MongoDB type of the element.
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private:
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virtual void read(BinaryReader& reader) = 0;
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virtual void write(BinaryWriter& writer) = 0;
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friend class Document;
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std::string _name;
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};
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inline std::string Element::name() const
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{
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return _name;
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}
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class ElementComparator
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{
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public:
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bool operator()(const Element::Ptr& s1, const Element::Ptr& s2)
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{
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return s1->name() < s2->name();
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}
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};
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typedef std::set<Element::Ptr, ElementComparator> ElementSet;
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template<typename T>
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struct ElementTraits
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{
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};
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// BSON Floating point
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// spec: double
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template<>
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struct ElementTraits<double>
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{
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enum { TypeId = 0x01 };
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static std::string toString(const double& value, int indent = 0)
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{
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return Poco::NumberFormatter::format(value);
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}
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};
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// BSON UTF-8 string
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// spec: int32 (byte*) "\x00"
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// int32 is the number bytes in byte* + 1 (for trailing "\x00"
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template<>
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struct ElementTraits<std::string>
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{
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enum { TypeId = 0x02 };
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static std::string toString(const std::string& value, int indent = 0)
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{
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std::ostringstream oss;
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oss << '"';
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for(std::string::const_iterator it = value.begin(); it != value.end(); ++it)
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{
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switch (*it)
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{
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case '"':
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oss << "\\\"";
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break;
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case '\\':
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oss << "\\\\";
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break;
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case '\b':
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oss << "\\b";
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break;
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case '\f':
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oss << "\\f";
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break;
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case '\n':
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oss << "\\n";
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break;
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case '\r':
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oss << "\\r";
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break;
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case '\t':
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oss << "\\t";
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break;
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default:
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{
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if ( *it > 0 && *it <= 0x1F )
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{
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oss << "\\u" << std::hex << std::uppercase << std::setfill('0') << std::setw(4) << static_cast<int>(*it);
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}
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else
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{
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oss << *it;
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}
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break;
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}
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}
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}
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oss << '"';
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return oss.str();
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}
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};
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template<>
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inline void BSONReader::read<std::string>(std::string& to)
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{
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Poco::Int32 size;
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_reader >> size;
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_reader.readRaw(size, to);
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to.erase(to.end() - 1); // remove terminating 0
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}
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template<>
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inline void BSONWriter::write<std::string>(std::string& from)
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{
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_writer << (Poco::Int32) (from.length() + 1);
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writeCString(from);
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}
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// BSON bool
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// spec: "\x00" "\x01"
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template<>
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struct ElementTraits<bool>
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{
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enum { TypeId = 0x08 };
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static std::string toString(const bool& value, int indent = 0)
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{
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return value ? "true" : "false";
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}
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};
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template<>
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inline void BSONReader::read<bool>(bool& to)
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{
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unsigned char b;
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_reader >> b;
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to = b != 0;
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}
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template<>
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inline void BSONWriter::write<bool>(bool& from)
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{
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unsigned char b = from ? 0x01 : 0x00;
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_writer << b;
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}
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// BSON 32-bit integer
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// spec: int32
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template<>
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struct ElementTraits<Int32>
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{
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enum { TypeId = 0x10 };
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static std::string toString(const Int32& value, int indent = 0)
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{
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return Poco::NumberFormatter::format(value);
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}
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};
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// BSON UTC datetime
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// spec: int64
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template<>
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struct ElementTraits<Timestamp>
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{
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enum { TypeId = 0x09 };
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static std::string toString(const Timestamp& value, int indent = 0)
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{
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return DateTimeFormatter::format(value, "%Y-%m-%dT%H:%M:%s%z");
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}
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};
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template<>
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inline void BSONReader::read<Timestamp>(Timestamp& to)
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{
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Poco::Int64 value;
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_reader >> value;
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to = Timestamp::fromEpochTime(value / 1000);
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to += (value % 1000 * 1000);
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}
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template<>
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inline void BSONWriter::write<Timestamp>(Timestamp& from)
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{
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_writer << (from.epochMicroseconds() / 1000);
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}
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typedef Nullable<unsigned char> NullValue;
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// BSON Null Value
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// spec:
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template<>
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struct ElementTraits<NullValue>
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{
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enum { TypeId = 0x0A };
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static std::string toString(const NullValue& value, int indent = 0)
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{
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return "null";
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}
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};
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template<>
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inline void BSONReader::read<NullValue>(NullValue& to)
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{
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}
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template<>
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inline void BSONWriter::write<NullValue>(NullValue& from)
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{
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}
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// BSON 64-bit integer
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// spec: int64
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template<>
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struct ElementTraits<Int64>
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{
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enum { TypeId = 0x12 };
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static std::string toString(const Int64& value, int indent = 0)
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{
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return NumberFormatter::format(value);
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}
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};
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template<typename T>
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class ConcreteElement : public Element
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{
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public:
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ConcreteElement(const std::string& name, const T& init) : Element(name), _value(init)
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{
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}
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virtual ~ConcreteElement()
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{
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}
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T value() const
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{
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return _value;
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}
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std::string toString(int indent = 0) const
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{
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return ElementTraits<T>::toString(_value, indent);
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}
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int type() const
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{
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return ElementTraits<T>::TypeId;
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}
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void read(BinaryReader& reader)
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{
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BSONReader(reader).read(_value);
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}
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void write(BinaryWriter& writer)
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{
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BSONWriter(writer).write(_value);
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}
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private:
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T _value;
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};
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} } // namespace Poco::MongoDB
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#endif // MongoDB_Element_INCLUDED
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