Changeset 1746:874e4bc21435 in lemon-0.x for lemon/error.h

Timestamp:

10/28/05 10:40:42 (19 years ago)

Author:

Balazs Dezso

Branch:

default

Phase:

public

Convert:

svn:c9d7d8f5-90d6-0310-b91f-818b3a526b0e/lemon/trunk@2274

Message:

If the file does not exist LemonReader? throws exception

File:

• lemon/error.h (modified) (1 diff)

lemon/error.h

@@ -325 +325 @@
 
     virtual ~DataFormatError() throw() {}
+  };
+
+  ///\e 
+  class FileOpenError : public IOError {
+  protected:
+    ExceptionMember<std::string> _file;
+
+    mutable ExceptionMember<std::string> _message_holder;
+  public:
+
+    FileOpenError(const FileOpenError &foe) : 
+      IOError(foe), _file(foe._file) {}
+
+    ///\e 
+    explicit FileOpenError(const std::string& file)
+      : _file(file) {}
+
+
+    ///\e 
+    void file(const std::string &file) { _file.set(file); }
+ 
+    /// \brief Returns the filename.
+    ///
+    /// Returns \e null if the filename was not specified.
+    const char* file() const {
+      if (_file.valid() && !_file.get().empty()) {
+        return _file.get().c_str();
+      } else {
+        return 0;
+      }
+    }
+
+    ///\e 
+    virtual const char* what() const throw() {
+      try {
+        std::ostringstream ostr;
+        ostr << exceptionName() << ": ";
+        ostr << "Cannot open file - " << file();
+        _message_holder.set(ostr.str());
+      }
+      catch (...) {}
+      if( _message_holder.valid()) return _message_holder.get().c_str();
+      return exceptionName();
+    }
+
+    virtual const char* exceptionName() const {
+      return "lemon::FileOpenError";
+    }
+
+    virtual ~FileOpenError() throw() {}
   };