source: orxonox.OLD/trunk/src/lib/util/loading/resource_manager.cc @ 8637

/*
   orxonox - the future of 3D-vertical-scrollers

   Copyright (C) 2004 orx

   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 2, or (at your option)
   any later version.

   ### File Specific:
   main-programmer: Benjamin Grauer
   co-programmer: Patrick Boenzli
*/

#define DEBUG_SPECIAL_MODULE DEBUG_MODULE_LOAD

#include "util/loading/resource_manager.h"
#include "substring.h"
#include "debug.h"

#include <algorithm>
#include <assert.h>

// different resource Types
#ifndef NO_MODEL
#include "objModel.h"
#include "primitive_model.h"
#include "md2/md2Model.h"
#endif /* NO_MODEL */
#ifndef NO_TEXTURES
#include "texture.h"
#endif /* NO_TEXTURES */
#ifndef NO_TEXT
#include "font.h"
#endif /* NO_TEXT */
#ifndef NO_AUDIO
#include "sound_buffer.h"
#include "ogg_player.h"
#endif /* NO_AUDIO */
#ifndef NO_SHADERS
#include "shader.h"
#endif /* NO_SHADERS */

// File Handling Includes
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>

using namespace std;

/**
 * @brief standard constructor
*/
ResourceManager::ResourceManager ()
{
  this->setClassID(CL_RESOURCE_MANAGER, "ResourceManager");
  this->setName("ResourceManager");

  this->dataDir = "./";
  this->tryDataDir("./data");
}

//! Singleton Reference to the ResourceManager
ResourceManager* ResourceManager::singletonRef = NULL;

/**
 * @brief standard destructor
*/
ResourceManager::~ResourceManager ()
{
  // deleting the Resources-List
  this->unloadAllByPriority(RP_GAME);

  if (!this->resourceList.empty())
    PRINTF(1)("Not removed all Resources, since there are still %d resources registered\n", this->resourceList.size());

  ResourceManager::singletonRef = NULL;
}

/**
 * @brief sets the data main directory
 * @param dataDir the DataDirectory.
 */
bool ResourceManager::setDataDir(const std::string& dataDir)
{
  File dataDirectory(dataDir);
  if (dataDirectory.isDirectory())
  {
    this->dataDir = dataDirectory.name();

    if (dataDir[dataDir.size()-1] != '/' && dataDir[dataDir.size()-1] != '\\')
    {
      this->dataDir += '/';
    }
    return true;
  }
  else
  {
    PRINTF(1)("%s is not a Directory, and can not be the Data Directory, leaving as %s \n", dataDir.c_str(), this->dataDir.c_str());
    return false;
  }
}

/**
 * @brief sets the data main directory
 * @param dataDir the DataDirectory.
 *
 * this is essentially the same as setDataDir, but it ommits the error-message
 */
bool ResourceManager::tryDataDir(const std::string& dataDir)
{
  File dataDirectory(dataDir);
  if (dataDirectory.isDirectory())
  {
    this->dataDir = dataDirectory.name();

    if (dataDir[dataDir.size()-1] != '/' && dataDir[dataDir.size()-1] != '\\')
    {
      this->dataDir += '/';
    }
    return true;
  }
  return false;
}


/**
 * @brief checks for the DataDirectory, by looking if
 * @param fileInside is iniside of the given directory.
*/
bool ResourceManager::verifyDataDir(const std::string& fileInside)
{
  File dataDirectory(this->dataDir);
  if (!dataDirectory.isDirectory())
  {
    PRINTF(1)("'%s' is not a directory\n", this->dataDir.c_str());
    return false;
  }

  File testFile(this->dataDir + fileInside);
  return testFile.isFile();
}

#ifndef NO_TEXTURES
/**
 * @brief adds a new Path for Images
 * @param imageDir The path to insert
 * @returns true, if the Path was well and injected (or already existent within the list)
   false otherwise
*/
bool ResourceManager::addImageDir(const std::string& imageDir)
{
  std::string newDir = imageDir;
  if (imageDir[imageDir.size()-1] != '/' && imageDir[imageDir.size()-1] != '\\')
  {
    newDir += '/';
  }
  // check if the param is a Directory
  if (File(newDir).isDirectory())
  {
    // check if the Directory has been added before
    std::vector<std::string>::const_iterator imageDir;
    for (imageDir = this->imageDirs.begin(); imageDir != this->imageDirs.end(); imageDir++)
    {
      if (*imageDir == newDir)
      {
        PRINTF(3)("Path %s already loaded\n", newDir.c_str());
        return true;
      }
    }
    // adding the directory to the List
    this->imageDirs.push_back(newDir);
    return true;
  }
  else
  {
    PRINTF(1)("%s is not a Directory, and can not be added to the Paths of Images\n", newDir.c_str());
    return false;
  }
}
#endif /* NO_TEXTURES */

/**
 * @brief loads resources
 * @param fileName: The fileName of the resource to load
 * @param prio: The ResourcePriority of this resource (will only be increased)
 * @param param0: an additional option to parse (see the constuctors for more help)
 * @param param1: an additional option to parse (see the constuctors for more help)
 * @param param2: an additional option to parse (see the constuctors for more help)
 * @returns a pointer to a desired Resource.
*/
BaseObject* ResourceManager::load(const std::string& fileName, ResourcePriority prio,
                                  const MultiType& param0, const MultiType& param1, const MultiType& param2)
{
  ResourceType tmpType;
#ifndef NO_MODEL
#define __IF_OK
  if (!strncasecmp(fileName.c_str()+(fileName.size()-4), ".obj", 4))
    tmpType = OBJ;
  else if (!strncmp(fileName.c_str()+(fileName.size()-4), ".md2", 4))
    tmpType = MD2;
  else if (!strcasecmp(fileName.c_str(), "cube") ||
            !strcasecmp(fileName.c_str(), "sphere") ||
            !strcasecmp(fileName.c_str(), "plane") ||
            !strcasecmp(fileName.c_str(), "cylinder") ||
            !strcasecmp(fileName.c_str(), "cone"))
    tmpType = PRIM;
#endif /* NO_MODEL */
#ifndef NO_AUDIO
#ifdef __IF_OK
  else
#endif
#define __IF_OK
    if (!strncasecmp(fileName.c_str()+(fileName.size()-4), ".wav", 4))
      tmpType = WAV;
    else if (!strncasecmp(fileName.c_str()+(fileName.size()-4), ".mp3", 4))
      tmpType = MP3;
    else if (!strncasecmp(fileName.c_str()+(fileName.size()-4), ".ogg", 4))
      tmpType = OGG;
#endif /* NO_AUDIO */
#ifndef NO_TEXT
#ifdef __IF_OK
    else
#endif
#define __IF_OK
      if (!strncasecmp(fileName.c_str()+(fileName.size()-4), ".ttf", 4))
        tmpType = TTF;
#endif /* NO_TEXT */
#ifndef NO_SHADERS
#ifdef __IF_OK
      else
#endif
#define __IF_OK
        if (!strncasecmp(fileName.c_str()+(fileName.size()-5), ".vert", 5))
          tmpType = SHADER;
#endif /* NO_SHADERS */
#ifndef NO_TEXTURES
#ifdef __IF_OK
        else
#else
  if
#endif
          tmpType = IMAGE;
#endif /* NO_TEXTURES */
#undef __IF_OK
  return this->load(fileName, tmpType, prio, param0, param1, param2);
}

/**
 * @brief caches a Resource
 *
 * @see load;
 *
 * @brief returns true if ok, false otherwise.
 * This function loads a Resource without applying it to an Object.
 * This is for loading purposes, e.g, when the user is loading a Resource
 * during the initialisation instead of at Runtime.
 */
bool ResourceManager::cache(const std::string& fileName, ResourceType type, ResourcePriority prio,
                            const MultiType& param0, const MultiType& param1, const MultiType& param2)
{
  // searching if the resource was loaded before.
  Resource* tmpResource;
  // check if we already loaded this Resource
  tmpResource = this->locateResourceByInfo(fileName, type, param0, param1, param2);
  // otherwise load it
  if (tmpResource == NULL)
    tmpResource = this->loadResource(fileName, type, prio, param0, param1, param2);
  // return cached pointer.
  if (tmpResource != NULL) // if the resource was loaded before.
  {
    if(tmpResource->prio < prio)
      tmpResource->prio = prio;
    return true;
  }
  else
    return false;
}

/**
 * tells the ResourceManager to generate a Copy of the Resource.
 * @brief resourcePointer: The Pointer to the resource to copy
 * @returns the Resource pointed to resourcePointer.
 */
BaseObject* ResourceManager::copy(BaseObject* resourcePointer)
{
  Resource* tmp = locateResourceByPointer(resourcePointer);
  if (tmp!=NULL)
  {
    tmp->count++;
    return tmp->pointer;
  }
  else
    return NULL;
}


/**
 * @brief loads resources
 * @param fileName: The fileName of the resource to load
 * @param type: The Type of Resource to load.
 * @param prio: The ResourcePriority of this resource (will only be increased)
 * @param param0: an additional option to parse (see the constuctors for more help)
 * @param param1: an additional option to parse (see the constuctors for more help)
 * @param param2: an additional option to parse (see the constuctors for more help)
 * @returns a pointer to a desired Resource.
*/
BaseObject* ResourceManager::load(const std::string& fileName, ResourceType type, ResourcePriority prio,
                                  const MultiType& param0, const MultiType& param1, const MultiType& param2)
{

  // searching if the resource was loaded before.
  Resource* tmpResource;
  // check if we already loaded this Resource
  tmpResource = this->locateResourceByInfo(fileName, type, param0, param1, param2);
  // otherwise load it
  if (tmpResource == NULL)
  {
    tmpResource = this->loadResource(fileName, type, prio, param0, param1, param2);
  }
  // return cached pointer.
  if (tmpResource != NULL) // if the resource was loaded before.
  {
    tmpResource->count++;
    if(tmpResource->prio < prio)
      tmpResource->prio = prio;

    return tmpResource->pointer;
  }
  else
    return NULL;
}


/**
 * @brief loads resources for internal purposes
 * @param fileName: The fileName of the resource to load
 * @param type: The Type of Resource to load.
 * @param prio: The ResourcePriority of this resource (will only be increased)
 * @param param0: an additional option to parse (see the constuctors for more help)
 * @param param1: an additional option to parse (see the constuctors for more help)
 * @param param2: an additional option to parse (see the constuctors for more help)
 * @returns a pointer to a desired Resource.
 */
Resource* ResourceManager::loadResource(const std::string& fileName, ResourceType type, ResourcePriority prio,
                                        const MultiType& param0, const MultiType& param1, const MultiType& param2)
{
  // Setting up the new Resource
  Resource* tmpResource = new Resource;
  tmpResource->count = 0;
  tmpResource->type = type;
  tmpResource->prio = prio;
  tmpResource->pointer = NULL;
  tmpResource->name = fileName;

  // creating the full name. (directoryName + FileName)
  std::string fullName = ResourceManager::getFullName(fileName);
  // Checking for the type of resource \see ResourceType
  switch(type)
  {
#ifndef NO_MODEL
    case OBJ:
      if (param0.getType() != MT_NULL)
        tmpResource->param[0] = param0;
      else
        tmpResource->param[0] = 1.0f;

      if(File(fullName).isFile())
        tmpResource->pointer = new OBJModel(fullName, tmpResource->param[0].getFloat());
      else
      {
        PRINTF(2)("File %s in %s does not exist. Loading a cube-Model instead\n", fileName.c_str(), dataDir.c_str());
        tmpResource->pointer = ResourceManager::load("cube", PRIM, prio, tmpResource->param[0].getFloat());
      }
      break;
    case PRIM:
      if (param0 != MT_NULL)
        tmpResource->param[0] = param0;
      else
        tmpResource->param[0] = 1.0f;

      if (tmpResource->name == "cube")
        tmpResource->pointer = new PrimitiveModel(PRIM_CUBE, tmpResource->param[0].getFloat());
      else if (tmpResource->name == "sphere")
        tmpResource->pointer = new PrimitiveModel(PRIM_SPHERE, tmpResource->param[0].getFloat());
      else if (tmpResource->name == "plane")
        tmpResource->pointer = new PrimitiveModel(PRIM_PLANE, tmpResource->param[0].getFloat());
      else if (tmpResource->name == "cylinder")
        tmpResource->pointer = new PrimitiveModel(PRIM_CYLINDER, tmpResource->param[0].getFloat());
      else if (tmpResource->name == "cone")
        tmpResource->pointer = new PrimitiveModel(PRIM_CONE, tmpResource->param[0].getFloat());
      break;
    case MD2:
      if(File(fullName).isFile())
      {
        tmpResource->param[0] = param0;
        tmpResource->param[1] = param1;
        tmpResource->pointer = new MD2Data(fullName, tmpResource->param[0].getCString(), tmpResource->param[1].getFloat());
      }
      break;
#endif /* NO_MODEL */
#ifndef NO_TEXT
    case TTF:
      if (param0 != MT_NULL)
      {
        assert(param0.getInt() >= 0);
        tmpResource->param[0] = param0;
      }
      else
        tmpResource->param[0] = FONT_DEFAULT_RENDER_SIZE;

      if(File(fullName).isFile())
        tmpResource->pointer = new Font(fullName, (unsigned int) tmpResource->param[0].getInt());
      else
        PRINTF(2)("%s does not exist in %s. Not loading Font\n", fileName.c_str(), this->dataDir.c_str());
      break;
#endif /* NO_TEXT */
#ifndef NO_AUDIO
    case WAV:
      if(File(fullName).isFile())
        tmpResource->pointer = new OrxSound::SoundBuffer(fullName);
      break;
    case OGG:
      if (File(fullName).isFile())
        tmpResource->pointer = new OrxSound::OggPlayer(fullName);
      break;
#endif /* NO_AUDIO */
#ifndef NO_TEXTURES
    case IMAGE:
      if (param0 != MT_NULL)
        tmpResource->param[0] = param0;
      else
        tmpResource->param[0] = GL_TEXTURE_2D;
      if(File(fullName).isFile())
      {
        PRINTF(4)("Image %s resides to %s\n", fileName.c_str(), fullName.c_str());
        tmpResource->pointer = new Texture(fullName, tmpResource->param[0].getInt());
      }
      else
      {
        std::vector<std::string>::iterator imageDir;
        for (imageDir = this->imageDirs.begin(); imageDir != this->imageDirs.end(); imageDir++)
        {
          std::string imgName = *imageDir + fileName;
          if(File(imgName).isFile())
          {
            PRINTF(4)("Image %s resides to %s\n", fileName.c_str(), imgName.c_str());
            tmpResource->pointer = new Texture(imgName, tmpResource->param[0].getInt());
            break;
          }
        }
      }
      if(!tmpResource)
        PRINTF(2)("!!Image %s not Found!!\n", fileName.c_str());
      break;
#endif /* NO_TEXTURES */
#ifndef NO_SHADERS
    case SHADER:
      if(File(fullName).isFile())
      {
        if (param0 != MT_NULL)
        {
          MultiType param = param0; /// HACK
          std::string secFullName = ResourceManager::getFullName(param.getCString());
          if (File(secFullName).isFile())
          {
            tmpResource->param[0] = secFullName;
            tmpResource->pointer = new Shader(fullName, secFullName);
          }
        }
        else
        {
          tmpResource->param[0] = param0;
          tmpResource->pointer = new Shader(fullName, "");
        }
      }
      break;
#endif /* NO_SHADERS */
    default:
      tmpResource->pointer = NULL;
      PRINTF(1)("No type found for %s.\n   !!This should not happen unless the Type is not supported yet. JUST DO IT!!\n", tmpResource->name.c_str());
      break;
  }
  if (tmpResource->pointer != NULL)
    this->resourceList.push_back(tmpResource);

  if (tmpResource->pointer != NULL)
    return tmpResource;
  else
  {
    PRINTF(2)("Resource %s could not be loaded\n", fileName.c_str());
    delete tmpResource;
    return NULL;
  }
}

/**
 * @brief unloads a Resource
 * @param pointer: The pointer to free
 * @param prio: the PriorityLevel to unload this resource
 * @returns true if successful (pointer found, and deleted), false otherwise
*/
bool ResourceManager::unload(BaseObject* pointer, ResourcePriority prio)
{
  if (pointer == NULL)
    return false;
  // if pointer is existent. and only one resource of this type exists.
  Resource* tmpResource = this->locateResourceByPointer(pointer);
  if (tmpResource != NULL)
    return unload(tmpResource, prio);
  else
  {
    PRINTF(2)("Resource not Found %p\n", pointer);
    return false;
  }
}

/**
 * @brief unloads a Resource
 * @param resource: The resource to unloade
 * @param prio the PriorityLevel to unload this resource
 * @returns true on success, false otherwise.
*/
bool ResourceManager::unload(Resource* resource, ResourcePriority prio)
{
  if (resource == NULL)
    return false;
  if (resource->count > 0)
    resource->count--;

  if (resource->prio <= prio)
  {
    if (resource->count == 0)
    {
      delete resource->pointer;
      // deleting the List Entry:
      PRINTF(4)("Resource %s safely removed.\n", resource->name.c_str());
      std::vector<Resource*>::iterator resourceIT = std::find(this->resourceList.begin(), this->resourceList.end(), resource);
      this->resourceList.erase(resourceIT);
      delete resource;
    }
    else
      PRINTF(4)("Resource %s not removed, because there are still %d References to it.\n", resource->name.c_str(), resource->count);
  }
  else
    PRINTF(4)("not deleting resource %s because DeleteLevel to high\n", resource->name.c_str());
  return true;
}


/**
 * @brief unloads all alocated Memory of Resources with a pririty lower than prio
 * @param prio The priority to delete
*/
bool ResourceManager::unloadAllByPriority(ResourcePriority prio)
{
  bool removedAll = true;
  unsigned int removeCount;
  for (unsigned int round = 0; round < 3; round++)
  {
    int index = this->resourceList.size() - 1;
    removeCount = 0;
    while (index >= 0)
    {
      if (this->resourceList[index]->prio <= prio)
      {
        if (this->resourceList[index]->count == 0)
          unload(this->resourceList[index], prio);
        else
        {
          if (round == 3)
          {
            PRINTF(2)("unable to unload %s because there are still %d references to it\n",
                      this->resourceList[index]->name.c_str(), this->resourceList[index]->count);
            removedAll = false;
          }
          removeCount++;
        }
      }
      index--;
    }
    if (removeCount == 0) break;
  }
  return removedAll;
}


/**
 * @brief Searches for a Resource by some information
 * @param fileName: The name to look for
 * @param type the Type of resource to locate.
 * @param param0: an additional option to parse (see the constuctors for more help)
 * @param param1: an additional option to parse (see the constuctors for more help)
 * @param param2: an additional option to parse (see the constuctors for more help)
 * @returns a Pointer to the Resource if found, NULL otherwise.
*/
Resource* ResourceManager::locateResourceByInfo(const std::string& fileName, ResourceType type,
    const MultiType& param0, const MultiType& param1, const MultiType& param2) const
{
  std::vector<Resource*>::const_iterator resource;
  for (resource = this->resourceList.begin(); resource != this->resourceList.end(); resource++)
  {
    if ((*resource)->type == type && fileName == (*resource)->name)
    {
      bool match = false;
      switch (type)
      {
#ifndef NO_MODEL
        case PRIM:
        case OBJ:
          if (param0 == MT_NULL)
          {
            if ((*resource)->param[0] == 1.0f)
              match = true;
          }
          else if ((*resource)->param[0] == param0.getFloat())
            match = true;
          break;
        case MD2:
          if (param0 == MT_NULL && ((*resource)->param[0] == "") && param1 == MT_NULL && ((*resource)->param[0] == 1.0f))
              match = true;
          else if ((*resource)->param[0] == ((MultiType)param0).getString() && (*resource)->param[1] == ((MultiType)param1).getFloat())
            match = true;
          break;
#endif /* NO_MODEL */
#ifndef NO_TEXT
        case TTF:
          if (param0 == MT_NULL)
          {
            if ((*resource)->param[0] == FONT_DEFAULT_RENDER_SIZE)
              match = true;
          }
          else if ((*resource)->param[0] == param0.getInt())
            match = true;
          break;
#endif /* NO_TEXT */
#ifndef NO_SHADERS
        case SHADER:
          if (param0 == MT_NULL)
          {
            if ((*resource)->param[0] == "")
              match = true;
          }
          else if ((*resource)->param[0] == ((MultiType)param0).getString())
            match = true;
          break;
#endif /* NO_SHADERS */
#ifndef NO_TEXTURES
        case IMAGE:
          if (param0 == MT_NULL)
          {
            if ((*resource)->param[0] == GL_TEXTURE_2D)
              match = true;
          }
          else if ((*resource)->param[0] ==  param0.getInt())
            match = true;
          break;
#endif /* NO_TEXTURES */
        default:
          match = true;
          break;
      }
      if (match)
      {
        return (*resource);
      }
    }
  }
  return NULL;
}

/**
 * @brief Searches for a Resource by Pointer
 * @param pointer the Pointer to search for
 * @returns a Pointer to the Resource if found, NULL otherwise.
 */
Resource* ResourceManager::locateResourceByPointer(const void* pointer) const
{
  //  Resource* enumRes = resourceList->enumerate();
  std::vector<Resource*>::const_iterator resource;
  for (resource = this->resourceList.begin(); resource != this->resourceList.end(); resource++)
    if (pointer == (*resource)->pointer)
      return (*resource);
  return NULL;
}

std::string ResourceManager::toResourcableString(unsigned int i)
{
/*  int len = strlen(ResourceManager::ResourceTypeToChar(this->resourceList[i]->type));
  len += this->resourceList[i]->name.size();
  if (this->resourceList[i]->param[0].getCString()) len += strlen(this->resourceList[i]->param[0].getCString()) +1;
  if (this->resourceList[i]->param[1].getCString()) len += strlen(this->resourceList[i]->param[1].getCString()) +1;
  if (this->resourceList[i]->param[2].getCString()) len += strlen(this->resourceList[i]->param[2].getCString()) +1;
  len += 10;
  std::string tmp = new char[len];
  tmp[0] = '\0';
  strcat(tmp, ResourceManager::ResourceTypeToChar(this->resourceList[i]->type));
  strcat(tmp,",");
  strcat (tmp, this->resourceList[i]->name);
  if (this->resourceList[i]->param[0].getCString() && this->resourceList[i]->param[0].getCString() != '\0')
  {
    strcat(tmp,",");
    strcat( tmp, this->resourceList[i]->param[0].getCString());
  }
  if (this->resourceList[i]->param[1].getCString() && this->resourceList[i]->param[1].getCString() != '\0')
  {
    strcat(tmp,",");
    strcat( tmp, this->resourceList[i]->param[1].getCString());
  }
  if (this->resourceList[i]->param[2].getCString() && this->resourceList[i]->param[2].getCString() != '\0')
  {
    strcat(tmp,",");
    strcat( tmp, this->resourceList[i]->param[2].getCString());
  }
  return tmp;*/
  return "";
}

/**
 * @brief caches a Resource from a ResourceableString created with the toResourcableString-function
 * @param resourceableString the String to cache the resource from.
 */
bool ResourceManager::fromResourceableString(const std::string& resourceableString)
{
/*  SubString splits(resourceableString, ',');
  splits.debug();
  if (splits.getCount() == 2)
    this->cache(splits[1], ResourceManager::stringToResourceType(splits[0]),
                RP_LEVEL);
  else if (splits.getCount() == 3)
    return this->cache(splits[1], ResourceManager::stringToResourceType(splits[0]),
                RP_LEVEL, splits[2]);
  else if (splits.getCount() == 4)
    return this->cache(splits[1], ResourceManager::stringToResourceType(splits[0]),
                RP_LEVEL, splits[2], splits[3]);
  else if (splits.getCount() == 5)
    return this->cache(splits[1], ResourceManager::stringToResourceType(splits[0]),
                RP_LEVEL, splits[2], splits[3], splits[4]);*/
  return false;
}


/**
 * @param fileName the Name of the File to check
 * @returns The full name of the file, including the DataDir, and NULL if the file does not exist
 * !!IMPORTANT: this has to be deleted from the outside!!
*/
std::string ResourceManager::getFullName(const std::string& fileName)
{
  if (fileName.empty() || ResourceManager::getInstance()->getDataDir().empty())
    return "";

  std::string retName = ResourceManager::getInstance()->getDataDir() +fileName;
  if (File(retName).isFile() || File(retName).isDirectory())
    return retName;
  else
    return "";
}


/**
 * @brief checks wether a file is in the DataDir.
 * @param fileName the File to check if it is in the Data-Dir structure.
 * @returns true if the file exists, false otherwise
 */
bool ResourceManager::isInDataDir(const std::string& fileName)
{
  if (fileName.empty() || ResourceManager::getInstance()->getDataDir().empty())
    return false;

  bool retVal = false;
  std::string checkFile = ResourceManager::getInstance()->getDataDir() + fileName;

  if (File(checkFile).exists())
    retVal = true;
  else
    retVal = false;
  return retVal;
}


/**
 * @brief outputs debug information about the ResourceManager
 */
void ResourceManager::debug() const
{
  PRINT(0)("=RM===================================\n");
  PRINT(0)("= RESOURCE-MANAGER DEBUG INFORMATION =\n");
  PRINT(0)("======================================\n");
  // if it is not initialized
  PRINT(0)(" Reference is: %p\n", ResourceManager::singletonRef);
  PRINT(0)(" Data-Directory is: %s\n", this->dataDir.c_str());
  PRINT(0)(" List of Image-Directories: ");
  std::vector<std::string>::const_iterator imageDir;
  for (imageDir = this->imageDirs.begin(); imageDir != this->imageDirs.end(); imageDir++)
    PRINT(0)("%s ", (*imageDir).c_str());
  PRINT(0)("\n");

  PRINT(0)("List of all stored Resources:\n");
  std::vector<Resource*>::const_iterator resource;
  for (resource = this->resourceList.begin(); resource != this->resourceList.end(); resource++)

  {
    PRINT(0)("-----------------------------------------\n");
    PRINT(0)("Name: %s; References: %d; Type: %s ", (*resource)->name.c_str(), (*resource)->count, ResourceManager::ResourceTypeToChar((*resource)->type));

    PRINT(0)("gets deleted at ");
    switch((*resource)->prio)
    {
      default:
      case RP_NO:
        PRINT(0)("first posibility (0)\n");
        break;
      case RP_LEVEL:
        PRINT(0)("the end of the Level (1)\n");
        break;
      case RP_CAMPAIGN:
        PRINT(0)("the end of the campaign (2)\n");
        break;
      case RP_GAME:
        PRINT(0)("when leaving the game (3)\n");
        break;
    }
  }



  PRINT(0)("==================================RM==\n");
}


/**
 * @brief converts a ResourceType into the corresponding String
 * @param type the ResourceType to translate
 * @returns the converted String.
 */
const char* ResourceManager::ResourceTypeToChar(ResourceType type)
{
  return ResourceManager::resourceNames[type];
}

/**
 * @brief converts a String into a ResourceType (good for loading)
 * @param resourceType the name of the Type
 * @returns the Number of the Type, or 0 (defautl) if not found.
 */
ResourceType ResourceManager::stringToResourceType(const std::string& resourceType)
{
  for (unsigned int i = 0; i < RESOURCE_TYPE_SIZE; i++)
    if (resourceType == ResourceManager::resourceNames[i])
      return (ResourceType)i;
  return (ResourceType)0;
}

/**
 * The Names of the ResourceTypes
 */
const char* ResourceManager::resourceNames[] =
  {
#ifndef NO_MODEL
    "ObjectModel",
    "PrimitiveModel",
    "MD2-Data",
#endif
#ifndef NO_TEXT
    "Font",
#endif
#ifndef NO_AUDIO
    "Wav",
    "mp3",
    "ogg",
#endif
#ifndef NO_TEXTURES
    "Texture",
#endif
#ifndef NO_SHADERS
    "Shader",
#endif

  };