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/**
* Implements a singleton that maintains program resources.
* The single instance is (re)instantiated on demand like:
* Resources *res = Resources::Instance();
*
* 24-05-07,Nigel Brown(EMBL): created.
* 3-7-07, Mark Larkin, modified this class for clustalw
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "ClustalWResources.h"
#include <iostream>
#include "clustalw.h"
#include <fstream>
using namespace std;
namespace clustalw
{
//environment variables
static const char *CLUW_INSTALL_DIR = "CLUW_INSTALL_DIR";
//return the sole instance
ClustalWResources *ClustalWResources::Instance() {
static ClustalWResources instance;
return &instance;
}
ClustalWResources::ClustalWResources()
{
//defaultPath
defaultPath = ".";
//executablePath
executablePath = ".";
//installPath
installPath = ".";
char *env;
if ((env = getenv(CLUW_INSTALL_DIR)) != 0)
{
installPath = string(env);
}
homePath = "";
}
void ClustalWResources::setPathToExecutable(string path)
{
executablePath = dirname(path);
}
string ClustalWResources::dirname(string path)
{
string tempString;
int size = path.size();
tempString = path;
for (int i = size - 1; i > 0; i--)
{
if (tempString[i] == DIRDELIM) // Mark, no standard function in c++
{
tempString.erase(i);
break;
}
}
return tempString;
}
void ClustalWResources::dump()
{
printf("%s => %s [%s]\n%s => %s\n%s => %s\n",
"installPath", installPath.c_str(), CLUW_INSTALL_DIR,
"executablePath", executablePath.c_str(),
"homePath", homePath.c_str()
);
}
string ClustalWResources::findFile(const char *file, const ClustalWResourcePathType where) const
{
return findFile(string(file), where);
}
string ClustalWResources::findFile(const string file, const ClustalWResourcePathType where) const
{
const string *path;
ifstream ifs;
switch (where)
{
case InstallPath:
path = &installPath;
break;
case ExecutablePath:
path = &executablePath;
break;
case HomePath:
path = &homePath;
break;
default:
path = &defaultPath;
break;
}
char delim[1];
delim[0] = DIRDELIM;
delim[1] = 0;
string fileName = *path + string(delim) + file;
ifs.open(fileName.c_str(), ifstream::in);
if (ifs.fail()) {
return string();
}
if (ifs.is_open() && ifs.good())
{
ifs.close();
return fileName;
}
return string(); //not found/readable
}
// Search for a (string) file in a succession of likely locations and
// return the full path as (string).
//
string ClustalWResources::searchPathsForFile(const string fileName) const
{
string file;
while (1) {
file = findFile(fileName, InstallPath);
if (file != "") break;
file = findFile(fileName, ExecutablePath);
if (file != "") break;
file = findFile(fileName, HomePath);
if (file != "") break;
file = findFile(fileName);
if (file != "") break;
file = fileName; // give up
break;
}
return file;
}
}
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