/usr/include/ossim/base/ossimFactoryBaseTemplate.h is in libossim-dev 1.8.16-4ubuntu1.
This file is owned by root:root, with mode 0o644.
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//
// License: See top level LICENSE.txt file.
//
// DESCRIPTION:
// Contains declaration of template class ossimFactory. This is the base
// type for all factories.
//
// SOFTWARE HISTORY:
//>
// 14Jun2001 Oscar Kramer (okramer@imagelinks.com)
// Initial coding.
//<
//*****************************************************************************
// $Id: ossimFactoryBaseTemplate.h 14799 2009-06-30 08:54:44Z dburken $
#ifndef ossimFactory_HEADER
#define ossimFactory_HEADER
#include <ossim/base/ossimConstants.h>
#include <list>
class ossimKeywordlist;
class ossimString;
/*!****************************************************************************
*
* TEMPLATE: ossimFactoryBase
*
* NOTE: This is primarily intended as an interface template only to insure
* that all factories prescribe to a common type. Concrete classes shall
* be derived from an instance of this template as:
*
* class MyFactory : public ossimFactoryBase<MyProductClass>
*
* where MyProductClass is the class type being produced.
*
* This template is applicable to "Registry" type factories that have
* one or more sub-factories. Thus, a common interface is provided
* without the client distinguishing between registries and factories.
*
* EXAMPLE: Refer to the projection factories for a working example of the
* use of this base class template. Specifically, refer to the files:
* - ../ossim_core/projections/factory/ossimProjectionFactory.h
* - ../ossim_core/projections/factory/ossimMapProjectionFactory.h
* - ../ossim_core/projections/factory/ossimSensorModelFactory.h
*
*****************************************************************************/
template <class Product> class OSSIMDLLEXPORT ossimFactoryBase
{
public:
/*!
* METHOD: instance()
* For accessing static singleton instance of concrete factory. The derived
* class implementation of this method invokes the factory's private
* constructor. MUST BE PROVIDED BY CONCRETE DERIVED CLASS as follows:
*
static <ossimFactoryBase-derived class>* instance();
*/
/*!
* PURE VIRTUAL METHODS: create(string), create(keywordlist, prefix)
*
* Attempts to create an instance of the Product given a string or
* keywordlist. It is up to the concrete factory implementation to decide
* how to interpret string. It could conceivably represent a "magic
* number" specification of a product (such as the class name). Or, it could
* be a filename that the factory must open to decide which product
* to instantiate. The derived factory can also define other create methods
* following the model used here.
*
* Returns successfully constructed product or NULL.
*/
virtual Product* create(const ossimString&) const = 0;
virtual Product* create(const ossimKeywordlist& kwl,
const char* prefix) const = 0;
/*!
* PURE VIRTUAL METHOD: getList()
* Returns name list of all products represented by this factory:
*/
virtual std::list<ossimString> getList() const = 0;
/*!
* METHOD: registerFactory()
* Adds sub-factories to this one. Relevant for the case where the
* derived factory maintains a registry of sub-factories.
*/
void registerFactory(ossimFactoryBase<Product>* new_factory)
{ if(new_factory) theRegistry.push_back(new_factory); }
protected:
/*!
* PROTECTED DEFAULT CONSTRUCTOR
* Gives concrete class the opportunity to perform initialization
* tasks since this is called once with first instance() call. If the
* derived factory is to serve as a sub-factory registry, then have the
* derived class' constructor call registerFactory() for all of the default
* sub-factories involved.
*/
ossimFactoryBase() {};
virtual ~ossimFactoryBase() {}
/*!
* Member contains list of sub-factories associated with this factory:
*/
std::list<ossimFactoryBase<Product>*> theRegistry;
};
#endif
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