/********************************************************************************

* *

* This file is part of IfcOpenShell. *

* *

* IfcOpenShell is free software: you can redistribute it and/or modify *

* it under the terms of the Lesser GNU General Public License as published by *

* the Free Software Foundation, either version 3.0 of the License, or *

* (at your option) any later version. *

* *

* IfcOpenShell is distributed in the hope that it will be useful, *

* but WITHOUT ANY WARRANTY; without even the implied warranty of *

* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *

* Lesser GNU General Public License for more details. *

* *

* You should have received a copy of the Lesser GNU General Public License *

* along with this program. If not, see <http://www.gnu.org/licenses/>. *

* *

********************************************************************************/

/********************************************************************************

* *

* This namespace provides implementations of Argument and Entity that use STL *

* containers for their datatypes and are not just lazy references to the *

* IFC-SPF file. Therefore they can be modified by the client application. *

* *

********************************************************************************/

#ifndef IFCWRITE_H

#define IFCWRITE_H

#include <boost/variant.hpp>

#include <boost/optional.hpp>

#include "../ifcparse/IfcUtil.h"

#include "../ifcparse/IfcParse.h"

namespace IfcWrite {

/// This class is a writable container for attributes. A fundamental

/// difference with the attribute types counterparts defined in the

/// IfcParse namespace is that this class has a Boost.Variant member

/// for storing its value, whereas the IfcParse classes only contain

/// lazy references to byte offsets in the IFC-SPF file.

class IfcWriteArgument : public Argument {

public:

class EnumerationReference {

public:

int data;

const char* enumeration_value;

EnumerationReference(int data, const char* enumeration_value)

: data(data), enumeration_value(enumeration_value) {}

};

class Derived {};

private:

IfcAbstractEntity* entity;

boost::variant<

// A null argument, it will always serialize to $

boost::none_t,

// A derived argument, it will always serialize to *

Derived,

// An integer argument, e.g. 123

int,

// A boolean argument, it will serialize to either .T. or .F.

bool,

// A floating point argument, e.g. 12.3

double,

// A character string argument, e.g. 'IfcOpenShell'

std::string,

// A list of integers, e.g. (1,2,3)

std::vector<int>,

// A list of floats, e.g. (12.3,4.)

std::vector<double>,

// A list of strings, e.g. ('Ifc','Open','Shell')

std::vector<std::string>,

// An enumeration argument, e.g. .USERDEFINED.

// To initialize the argument a string representation

// has to be explicitely passed of the enumeration value

// which is stored internally as an integer. The argument

// itself does not keep track of what schema enumeration

// type is represented.

EnumerationReference,

// An entity instance argument. It will either serialize to

// e.g. #123 or datatype identifier for simple types, e.g.

// IFCREAL(12.3)

IfcUtil::IfcBaseClass*,

// An entity list argument. It will either serialize to

// e.g. (#1,#2,#3) or datatype identifier for simple types,

// e.g. (IFCREAL(1.2),IFCINTEGER(3.))

IfcEntityList::ptr,

// A list of list of entities. E.g. ((#1, #2), (#3))

IfcEntityListList::ptr

> container;

public:

IfcWriteArgument(IfcAbstractEntity* e) : entity(e) {}

template <typename T> const T& as() const {

if (const T* val = boost::get<T>(&container)) {

return *val;

} else {

throw IfcParse::IfcException("Invalid cast");

}

}

template <typename T> void set(const T& t) {

container = t;

}

operator int() const;

operator bool() const;

operator double() const;

operator std::string() const;

operator std::vector<double>() const;

operator std::vector<int>() const;

operator std::vector<std::string>() const;

operator IfcUtil::IfcBaseClass*() const;

operator IfcEntityList::ptr() const;

operator IfcEntityListList::ptr() const;

bool isNull() const;

Argument* operator [] (unsigned int i) const;

std::string toString(bool upper=false) const;

unsigned int size() const;

IfcUtil::ArgumentType type() const;

};

/// A helper class for the creation of IFC GlobalIds.

class IfcGuidHelper {

private:

std::string data;

static bool seeded;

public:

static const unsigned int length = 22;

IfcGuidHelper();

operator std::string() const;

};

// Accumulates all schema instances created from constructors

// This way they can be added in a single batch to the IfcFile

class EntityBuffer {

private:

IfcEntityList::ptr buffer;

static EntityBuffer* i;

static EntityBuffer* instance();

public:

static IfcEntityList::ptr Get();

static void Clear();

static void Add(IfcUtil::IfcBaseClass* e);

};

}

#endif