/home/master/UCL/VisualizationLibrary/src/vlCore/LoadWriterManager.cpp

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/*  Visualization Library                                                             */
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#include <vlCore/LoadWriterManager.hpp>
#include <vlCore/Log.hpp>
#include <vlCore/Say.hpp>
#include <vlCore/Time.hpp>
#include <vlCore/GZipCodec.hpp>

using namespace vl;

//-----------------------------------------------------------------------------
const ResourceLoadWriter* LoadWriterManager::findLoader(VirtualFile* file) const 
{
  if (file->path().empty())
    Log::warning("findLoader(VirtualFile* file): cannot check the file extension, file->path() is empty!\n");
  return findLoader(file->path());
}
//-----------------------------------------------------------------------------
const ResourceLoadWriter* LoadWriterManager::findWriter(VirtualFile* file) const 
{
  if (file->path().empty())
    Log::warning("findWriter(VirtualFile* file): cannot check the file extension, file->path() is empty!\n");
  return findWriter(file->path());
}
//-----------------------------------------------------------------------------
ref<ResourceDatabase> LoadWriterManager::loadResource(const String& path, bool quick) const 
{
  struct TimerClass
  {
    TimerClass(const String* path): mPath(path)
    {
      mTimer.start();
    }
    ~TimerClass()
    {
      Log::debug( Say("loadResource('%s'): %ns\n") << *mPath << mTimer.elapsed() );
    }
    Time mTimer;
    const String* mPath;
  } timer(&path);

  ref<VirtualFile> file = locateFile(path);

  if (file)
  {
    if (path.endsWith(".gz") || path.endsWith(".GZ"))
    {
      ref<GZipCodec> gz = new GZipCodec;
      gz->setStream(file.get());
      // remove .gz suffix so that correct loader can be picked up
      gz->setPath( file->path().left(-3) );
      file = gz;
    }
    return loadResource(file.get(), quick);
  }
  else
    return NULL;
}
//-----------------------------------------------------------------------------
ref<ResourceDatabase> LoadWriterManager::loadResource(VirtualFile* file, bool quick) const 
{
  const ResourceLoadWriter* loadwriter = findLoader(file);
  if (loadwriter)
  {
    ref<ResourceDatabase> db;
    if (quick)
    {
      // caching the data in the memory provides a huge performance boost
      ref<MemoryFile> memfile = new MemoryFile;
      memfile->allocateBuffer(file->size());
      file->open(OM_ReadOnly);
      file->read(memfile->ptr(),file->size());
      file->close();
      memfile->setPath(file->path());
      db = loadwriter->loadResource(memfile.get());
    }
    else
      db = loadwriter->loadResource(file);
    // load callbacks
    for(size_t i=0; db && i<loadCallbacks().size(); ++i)
      loadCallbacks()[i].get_writable()->operator()(db.get());
    return db;
  }
  else
  {
    Log::error( Say("no ResourceLoadWriter registered to load '%s'.\n") << file->path() );
    return NULL; 
  }
}
//-----------------------------------------------------------------------------
bool LoadWriterManager::writeResource(const String& path, ResourceDatabase* resource) const
{
  const ResourceLoadWriter* loadwriter = findWriter(path);
  if (loadwriter)
  {
    // write callbacks
    for(size_t i=0; i<writeCallbacks().size(); ++i)
      writeCallbacks()[i].get_writable()->operator()(resource);
    // write resource
    return loadwriter->writeResource(path,resource);
  }
  else
  {
    Log::error( Say("no ResourceLoadWriter registered to write '%s'.\n") << path );
    return false; 
  }
}
//-----------------------------------------------------------------------------
bool LoadWriterManager::writeResource(VirtualFile* file, ResourceDatabase* resource) const
{ 
  const ResourceLoadWriter* loadwriter = findWriter(file);
  if (loadwriter)
  {
    // write callbacks
    for(size_t i=0; i<writeCallbacks().size(); ++i)
      writeCallbacks()[i].get_writable()->operator()(resource);
    // write resource
    return loadwriter->writeResource(file,resource);
  }
  else
  {
    Log::error( Say("no ResourceLoadWriter registered to write '%s'.\n") << file->path() );
    return false; 
  }
}
//-----------------------------------------------------------------------------
const ResourceLoadWriter* LoadWriterManager::findLoader(const String& path) const 
{
  String ext = path.extractFileExtension(false).toLowerCase();
  for(size_t i=0; i<loadWriters().size(); ++i)
    if (loadWriters()[i]->canLoad(ext))
      return loadWriters()[i].get();

  return NULL;
}
//-----------------------------------------------------------------------------
const ResourceLoadWriter* LoadWriterManager::findWriter(const String& path) const 
{
  String ext = path.extractFileExtension(false).toLowerCase();
  for(size_t i=0; i<loadWriters().size(); ++i)
    if (loadWriters()[i]->canWrite(ext))
      return loadWriters()[i].get();

  return NULL;
}
//-----------------------------------------------------------------------------
void LoadWriterManager::registerLoadWriter(ResourceLoadWriter* load_writer)
{
  ref<ResourceLoadWriter> lowr = load_writer;
  // remove load writer
  std::vector< ref<ResourceLoadWriter> >::iterator it = std::find( loadWriters().begin(), loadWriters().end(), load_writer );
  if( it != loadWriters().end() )
    loadWriters().erase( it );
  // insert load writer
  loadWriters().push_back( load_writer );
}
//-----------------------------------------------------------------------------
bool vl::canLoad(const String& path)  { return defLoadWriterManager()->canLoad(path);  }
//-----------------------------------------------------------------------------
bool vl::canWrite(const String& path) { return defLoadWriterManager()->canWrite(path); }
//-----------------------------------------------------------------------------
bool vl::canLoad(VirtualFile* file)   { return defLoadWriterManager()->canLoad(file);  }
//-----------------------------------------------------------------------------
bool vl::canWrite(VirtualFile* file)  { return defLoadWriterManager()->canWrite(file); }
//-----------------------------------------------------------------------------
ref<ResourceDatabase> vl::loadResource(const String& path, bool quick) { return defLoadWriterManager()->loadResource(path,quick); }
//-----------------------------------------------------------------------------
ref<ResourceDatabase> vl::loadResource(VirtualFile* file, bool quick)  { return defLoadWriterManager()->loadResource(file,quick); }
//-----------------------------------------------------------------------------
bool vl::writeResource(const String& path, ResourceDatabase* resource) { return defLoadWriterManager()->writeResource(path, resource); }
//-----------------------------------------------------------------------------
bool vl::writeResource(VirtualFile* file, ResourceDatabase* resource) { return defLoadWriterManager()->writeResource(file, resource); }
//-----------------------------------------------------------------------------