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//
// VMime library (http://www.vmime.org)
// Copyright (C) 2002 Vincent Richard <vincent@vmime.org>
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License as
// published by the Free Software Foundation; either version 3 of
// the License, or (at your option) any later version.
//
// This program 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 GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
// Linking this library statically or dynamically with other modules is making
// a combined work based on this library. Thus, the terms and conditions of
// the GNU General Public License cover the whole combination.
//
#ifndef VMIME_HEADERFIELDFACTORY_HPP_INCLUDED
#define VMIME_HEADERFIELDFACTORY_HPP_INCLUDED
#include "vmime/headerField.hpp"
#include "vmime/utility/stringUtils.hpp"
namespace vmime {
/** Creates header field and header field value objects.
*/
class VMIME_EXPORT headerFieldFactory {
protected:
headerFieldFactory();
~headerFieldFactory();
typedef shared_ptr <headerField> (*AllocFunc)(void);
typedef std::map <string, AllocFunc> NameMap;
NameMap m_nameMap;
struct ValueInfo {
typedef shared_ptr <headerFieldValue> (*ValueAllocFunc)(void);
typedef bool (*ValueTypeCheckFunc)(const object&);
ValueAllocFunc allocFunc;
ValueTypeCheckFunc checkTypeFunc;
};
typedef std::map <string, ValueInfo> ValueMap;
ValueMap m_valueMap;
public:
static shared_ptr <headerFieldFactory> getInstance();
#ifndef VMIME_BUILDING_DOC
// TYPE must inherit from BASE_TYPE
template <class BASE_TYPE, class TYPE>
class registerer {
public:
static bool checkType(const object& obj) {
const TYPE* typedObj = dynamic_cast <const TYPE*>(&obj);
return typedObj != NULL;
}
static shared_ptr <BASE_TYPE> creator() {
// Allocate a new object
return shared_ptr <BASE_TYPE>(new TYPE());
}
};
#endif // VMIME_BUILDING_DOC
/** Register a field type.
*
* @param T field class (must inherit from 'headerField')
* @param name field name (eg. "X-MyField")
*/
template <class T>
void registerField(const string& name) {
m_nameMap.insert(
NameMap::value_type(
utility::stringUtils::toLower(name),
®isterer <headerField, T>::creator
)
);
}
/** Register a field value type.
*
* @param T value class (must inherit from 'headerFieldValue')
* @param name field name
*/
template <class T>
void registerFieldValue(const string& name) {
ValueInfo vi;
vi.allocFunc = ®isterer <headerFieldValue, T>::creator;
vi.checkTypeFunc = ®isterer <headerField, T>::checkType;
m_valueMap.insert(
ValueMap::value_type(
utility::stringUtils::toLower(name),
vi
)
);
}
/** Create a new field object for the specified field name.
* If the field name has not been registered, a default type
* is used.
*
* @param name field name
* @param body string that will be parsed to initialize
* the value of the field
* @return a new field object
*/
shared_ptr <headerField> create(const string& name, const string& body = NULL_STRING);
/** Create a new field value for the specified field.
*
* @param fieldName name of the field for which to create value
* @return a new value object for the field
*/
shared_ptr <headerFieldValue> createValue(const string& fieldName);
/** Returns whether the specified value type is valid for the specified field.
*
* @param field header field
* @param value value for this header field
* @return true if the value type is compatible with the header field, or
* false otherwise
*/
bool isValueTypeValid(const headerField& field, const headerFieldValue& value) const;
};
} // vmime
#endif // VMIME_HEADERFIELDFACTORY_HPP_INCLUDED
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