prevent writing XPIP file to an URL

src/fr/inra/pappso/xtandempipeline/XtandemPipelineMain.java

@@ -98,6 +98,7 @@ public class XtandemPipelineMain {
 					in = new XpipFile(urlOfXpipData);
 					logger.info("Starting new main with ProticPort");
 					new Main_Windows(in);
+					
 				} catch (IOException e) {
 					logger.error("unable to open URL "
 							+ urlOfXpipData.toString());

src/fr/inra/pappso/xtandempipeline/class_msms/XpipFile.java

@@ -50,11 +50,13 @@ public class XpipFile {
 	}
 
 	public XpipFile(URL urlOfXpipData) {
+		logger.debug("urlOfXpipData " + urlOfXpipData.toString());
 		if (urlOfXpipData.getProtocol().equals("file")) {
 			File test = new File(urlOfXpipData.getFile());
 			if (test.exists()) {
 				xpipFile = test;
 				urlOfXpipData = null;
+				logger.debug("xpipFile " + xpipFile.getAbsolutePath());
 				return;
 			}
 		}
@@ -88,6 +90,13 @@ public class XpipFile {
 			XtandemPipelineSession session) throws Exception {
 		save_project save = new save_project(session.getIdentificationList(),
 				session.getDataTypeBase(), save_result_and_filtering);
+		if (xpipFile == null) {
+			String message = "Unable to write XPIP data to an URL ("
+					+ urlOfXpipData.toString()
+					+ "). Try \"Save project as\" instead.";
+			logger.debug(message);
+			throw new MSMSException(message);
+		}
 		save.write_data_to(xpipFile);
 		this.modified = false;
 	}