poco/MongoDB/src/Document.cpp

//
// Document.cpp
//
// $Id$
//
// Library: MongoDB
// Package: MongoDB
// Module:  Document
//
// Implementation of the Document class.
//
// Copyright (c) 2012, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
//
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//

#include <sstream>

#include "Poco/MongoDB/Document.h"
#include "Poco/MongoDB/Binary.h"
#include "Poco/MongoDB/ObjectId.h"
#include "Poco/MongoDB/Array.h"

namespace Poco
{
namespace MongoDB
{


Document::Document()
{
}

Document::~Document()
{
}

void Document::read(BinaryReader& reader)
{
	int size;
	reader >> size;

	unsigned char type;
	reader >> type;

	while( type != '\0' )
	{
		Element::Ptr element;

		std::string name = BSONReader(reader).readCString();

		switch(type)
		{
		case ElementTraits<double>::TypeId:
			element = new ConcreteElement<double>(name, 0);
			break;
		case ElementTraits<Int32>::TypeId:
			element = new ConcreteElement<Int32>(name, 0);
			break;
		case ElementTraits<std::string>::TypeId:
			element = new ConcreteElement<std::string>(name, "");
			break;
		case ElementTraits<Document::Ptr>::TypeId:
			element = new ConcreteElement<Document::Ptr>(name, new Document());
			break;
		case ElementTraits<Array::Ptr>::TypeId:
			element = new ConcreteElement<Array::Ptr>(name, new Array());
			break;
		case ElementTraits<Binary::Ptr>::TypeId:
			element = new ConcreteElement<Binary::Ptr>(name, new Binary());
			break;
		case ElementTraits<ObjectId::Ptr>::TypeId:
			element = new ConcreteElement<ObjectId::Ptr>(name, new ObjectId());
			break;
		case ElementTraits<bool>::TypeId:
			element = new ConcreteElement<bool>(name, false);
			break;
		case ElementTraits<Poco::Timestamp>::TypeId:
			element = new ConcreteElement<Poco::Timestamp>(name, Poco::Timestamp());
			break;
		case ElementTraits<NullValue>::TypeId:
			element = new ConcreteElement<NullValue>(name, NullValue(0));
			break;
		case ElementTraits<RegularExpression::Ptr>::TypeId:
			element = new ConcreteElement<RegularExpression::Ptr>(name, new RegularExpression());
			break;
		case ElementTraits<JavaScriptCode::Ptr>::TypeId:
			element = new ConcreteElement<JavaScriptCode::Ptr>(name, new JavaScriptCode());
			break;
		case ElementTraits<Int64>::TypeId:
			element = new ConcreteElement<Int64>(name, 0);
			break;
		default:
			{
				std::stringstream ss;
				ss << "Element " << name << " contains an unsupported type " << std::hex << (int) type;
				throw Poco::NotImplementedException(ss.str());
			}
		//TODO: x0F -> JavaScript code with scope
		//		xFF -> Min Key
		//		x7F -> Max Key
		}

		element->read(reader);
		_elements.insert(element);

		reader >> type;
	}
}


std::string Document::toString() const
{
	std::ostringstream oss;
	for(ElementSet::iterator it = _elements.begin(); it != _elements.end(); ++it)
	{
		oss << (*it)->name() << " ";
	}
	return oss.str();
}


void Document::write(BinaryWriter& writer)
{
	if ( _elements.empty() )
	{
		writer << 5;
	}
	else
	{
		std::stringstream sstream;
		Poco::BinaryWriter tempWriter(sstream);
		for(ElementSet::iterator it = _elements.begin(); it != _elements.end(); ++it)
		{
			tempWriter << (unsigned char) (*it)->type();
			BSONWriter(tempWriter).writeCString((*it)->name());
			Element::Ptr element = *it;
			element->write(tempWriter);
		}
		tempWriter.flush();
		
		Poco::Int32 len = 5 + sstream.tellp(); /* 5 = sizeof(len) + 0-byte */
		writer << len;
		writer.writeRaw(sstream.str());
	}
	writer << '\0';
}

void Document::addElement(Element::Ptr element)
{
	_elements.insert(element);
}

}} // Namespace Poco::MongoDB