Implemented Platform::loadPluginsFromDirectory()

olla/include/openmm/Platform.h

@@ -181,6 +181,16 @@ public:
      *               or relative to a set of standard locations.
      */
     static void loadPluginLibrary(std::string file);
+    /**
+     * Load multiple dynamic libraries (DLLs) which contain OpenMM plugins from a single directory.
+     * This method loops over every file contained in the specified directory and calls loadPluginLibrary()
+     * for each one.  If an error occurs while trying to load a particular file, that file is simply
+     * ignored.
+     *
+     * @param directory    the path to the directory containing libraries to load
+     * @return the names of all files which were successfully loaded as libraries
+     */
+    static std::vector<std::string> loadPluginsFromDirectory(std::string directory);
 private:
 
 // Retarded visual studio compiler complains about being unable to 

olla/src/Platform.cpp

@@ -40,6 +40,7 @@
 #include <sstream>
 #else
 #include <dlfcn.h>
+#include <dirent.h>
 #endif
 #include <set>
 
@@ -151,3 +152,43 @@ void Platform::loadPluginLibrary(string file) {
         throw OpenMMException("Error loading library "+file+": "+dlerror());
 #endif
 }
+
+vector<string> Platform::loadPluginsFromDirectory(string directory) {
+    vector<string> files;
+    char dirSeparator;
+#ifdef _MSC_VER
+    dirSeparator = '\\';
+    WIN32_FIND_DATA fileInfo;
+    string filePattern(directory + dirSeparator + "*");
+    HANDLE findHandle = FindFirstFile(filePattern.c_str(), &fileInfo);
+    if (findHandle != INVALID_HANDLE_VALUE) {
+        do {
+            if (fileInfo.cFileName[0] != '.')
+                files.push_back(string(fileInfo.cFileName));
+        } while (FindNextFile(findHandle, &fileInfo));
+        FindClose(findHandle);
+    }
+#else
+    dirSeparator = '/';
+    DIR* dir;
+    struct dirent *entry;
+    dir = opendir(directory.c_str());
+    if (dir != NULL) {
+        while ((entry = readdir(dir)) != NULL) {
+            if (entry->d_name[0] != '.')
+                files.push_back(string(entry->d_name));
+        }
+        closedir(dir);
+    }
+#endif
+    vector<string> loadedLibraries;
+    for (unsigned int i = 0; i < files.size(); ++i) {
+        try {
+            Platform::loadPluginLibrary(directory+dirSeparator+files[i]);
+            loadedLibraries.push_back(files[i]);
+        } catch (OpenMMException ex) {
+            // Just ignore it.
+        }
+    }
+    return loadedLibraries;
+}