132 lines
3.3 KiB
C++
132 lines
3.3 KiB
C++
// ResourceManager.cxx -- manage finding resources by names/paths
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// Copyright (C) 2010 James Turner
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Library General Public
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// License as published by the Free Software Foundation; either
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// version 2 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Library General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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//
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// $Id$
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#include <assert.h>
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#include <algorithm>
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#include <simgear_config.h>
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#include <simgear/misc/ResourceManager.hxx>
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#include <simgear/debug/logstream.hxx>
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namespace simgear
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{
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static ResourceManager* static_manager = nullptr;
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ResourceProvider::~ResourceProvider()
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{
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// pin to this compilation unit
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}
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ResourceManager::ResourceManager()
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{
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}
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ResourceManager* ResourceManager::instance()
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{
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if (!static_manager) {
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static_manager = new ResourceManager();
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}
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return static_manager;
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}
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ResourceManager::~ResourceManager()
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{
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assert(this == static_manager);
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static_manager = nullptr;
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std::for_each(_providers.begin(), _providers.end(),
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[](ResourceProvider* p) { delete p; });
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}
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/**
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* trivial provider using a fixed base path
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*/
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class BasePathProvider : public ResourceProvider
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{
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public:
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BasePathProvider(const SGPath& aBase, ResourceManager::Priority aPriority) :
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ResourceProvider(aPriority),
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_base(aBase)
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{
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}
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virtual SGPath resolve(const std::string& aResource, SGPath&) const
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{
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SGPath p(_base, aResource);
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return p.exists() ? p : SGPath();
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}
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private:
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SGPath _base;
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};
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void ResourceManager::addBasePath(const SGPath& aPath, Priority aPriority)
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{
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addProvider(new BasePathProvider(aPath, aPriority));
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}
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void ResourceManager::addProvider(ResourceProvider* aProvider)
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{
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assert(aProvider);
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ProviderVec::iterator it = _providers.begin();
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for (; it != _providers.end(); ++it) {
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if (aProvider->priority() > (*it)->priority()) {
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_providers.insert(it, aProvider);
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return;
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}
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}
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// fell out of the iteration, goes to the end of the vec
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_providers.push_back(aProvider);
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}
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void ResourceManager::removeProvider(ResourceProvider* aProvider)
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{
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assert(aProvider);
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auto it = std::find(_providers.begin(), _providers.end(), aProvider);
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if (it == _providers.end()) {
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SG_LOG(SG_GENERAL, SG_DEV_ALERT, "unknown provider doing remove");
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return;
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}
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}
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SGPath ResourceManager::findPath(const std::string& aResource, SGPath aContext)
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{
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if (!aContext.isNull()) {
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SGPath r(aContext, aResource);
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if (r.exists()) {
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return r;
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}
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}
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for (auto provider : _providers) {
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SGPath path = provider->resolve(aResource, aContext);
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if (!path.isNull()) {
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return path;
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}
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}
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return SGPath();
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}
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} // of namespace simgear
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