ModuleImporter.cc

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// -*- lsst-c++ -*-
/*
 * LSST Data Management System
 * Copyright 2008-2013 LSST Corporation.
 *
 * This product includes software developed by the
 * LSST Project (http://www.lsst.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 LSST License Statement and
 * the GNU General Public License along with this program.  If not,
 * see <http://www.lsstcorp.org/LegalNotices/>.
 */
 
#include "lsst/base/ModuleImporter.h"
 
namespace lsst { namespace base {
 
namespace {
 
class PlaceholderModuleImporter : public ModuleImporter {
public:
    static ModuleImporter const * get() {
        static PlaceholderModuleImporter const instance;
        return &instance;
    }
private:
    PlaceholderModuleImporter() {}
protected:
    virtual bool _import(std::string const & name) const { return false; }
};
 
ModuleImporter const * & getImporterSingleton() {
    static ModuleImporter const * instance = PlaceholderModuleImporter::get();
    return instance;
}
 
} // anonymous
 
bool ModuleImporter::import(std::string const & name) {
    return getImporterSingleton()->_import(name);
}
 
void ModuleImporter::install(ModuleImporter const * importer) {
    getImporterSingleton() = importer;
}
 
}} // namespace lsst::base