more error messages for loading an annotation.

[mussa.git] / alg / sequence.cpp

diff --git a/alg/sequence.cpp b/alg/sequence.cpp
index 147fdce3b7e2c015eb20741964327954f70a924a..452f5f98f204d37bf0f85f173eb1f42fc2a07313 100644 (file)
--- a/alg/sequence.cpp
+++ b/alg/sequence.cpp
@@ -22,6 +22,7 @@
 //                           ---------- sequence.cc -----------
 //                        ----------------------------------------
 #include <boost/filesystem/fstream.hpp>
+#include <boost/filesystem/operations.hpp>
 namespace fs = boost::filesystem;
 
 #include <boost/spirit/core.hpp>
@@ -313,10 +314,18 @@ void Sequence::set_filtered_sequence(const std::string &in_seq,
 void
 Sequence::load_annot(fs::path file_path, int start_index, int end_index)
 {
+  if (not fs::exists(file_path)) {
+    throw mussa_load_error("Annotation File " + file_path.string() + " was not found");
+  }
+  if (fs::is_directory(file_path)) {
+    throw mussa_load_error(file_path.string() +
+            " is a directory, please provide a file for annotations."
+          );
+  }    
   fs::fstream data_stream(file_path, std::ios::in);
   if (!data_stream)
   {
-    throw mussa_load_error("Sequence File: " + file_path.string() + " not found");
+    throw mussa_load_error("Error loading annotation file " + file_path.string());
   }
 
   // so i should probably be passing the parse function some iterators