issue #1 fixed

TaskAndTimeTimJahn.txt

@@ -16,6 +16,9 @@ Nachfolgend die Informationen die du brauchst.
     Für weiterführende Konzepte ist meist leider nur die API Doku 
 		https://eclipse.dev/glsp/documentation/ oder der Code da
         Diese solltest du dir bei Bedarf, wenn du am Issues fixen bist anschauen
+
+		example:
+			https://github.com/eclipse-glsp/glsp-examples/tree/master/project-templates/java-emf-theia
 		
     Der Editor selbst ist in 
 		https://git-st.inf.tu-dresden.de/dineros/framework/pnml-petri-net-editor
@@ -45,6 +48,7 @@ hours:
 01.12.24 8h
 08.12.24 8h
 16.12.24 12h
+22.12.24 12h
 //------------------------------------------------------------------------------------------------------
 
 see https://github.com/eclipse-theia/theia/blob/master/doc/Developing.md#prerequisite_native_keymap
@@ -59,6 +63,13 @@ sudo npm install -g n
 node --version
 sudo n 20.18.0  //theia needs version < 21
 
+===============================================================
+alt. if sudo n does not work (check with node --version):
+
+curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.40.1/install.sh | bash
+nvm install 20
+===============================================================
+
 curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | sudo apt-key add -
 echo "deb https://dl.yarnpkg.com/debian/ stable main" | sudo tee /etc/apt/sources.list.d/yarn.list
 sudo apt update && sudo apt install yarn

glsp-server/.classpath

 <?xml version="1.0" encoding="UTF-8"?>
 <classpath>
-	<classpathentry kind="src" output="target_classes" path="src-gen">
+	<classpathentry kind="src" output="target/classes" path="src-gen">
 		<attributes>
 			<attribute name="optional" value="true"/>
 			<attribute name="maven.pomderived" value="true"/>
@@ -12,19 +12,19 @@
 		</attributes>
 	</classpathentry>
 	<classpathentry kind="con" path="org.eclipse.pde.core.requiredPlugins"/>
-	<classpathentry kind="src" output="target_classes" path="src/main/java">
+	<classpathentry kind="src" output="target/classes" path="src/main/java">
 		<attributes>
 			<attribute name="optional" value="true"/>
 			<attribute name="maven.pomderived" value="true"/>
 		</attributes>
 	</classpathentry>
-	<classpathentry excluding="**" kind="src" output="target_classes" path="src/main/resources">
+	<classpathentry excluding="**" kind="src" output="target/classes" path="src/main/resources">
 		<attributes>
 			<attribute name="maven.pomderived" value="true"/>
 			<attribute name="optional" value="true"/>
 		</attributes>
 	</classpathentry>
-	<classpathentry excluding="**" kind="src" output="target_classes" path="model">
+	<classpathentry excluding="**" kind="src" output="target/classes" path="model">
 		<attributes>
 			<attribute name="maven.pomderived" value="true"/>
 			<attribute name="optional" value="true"/>
@@ -66,5 +66,5 @@
 			<attribute name="test" value="true"/>
 		</attributes>
 	</classpathentry>
-	<classpathentry kind="output" path="target_classes"/>
+	<classpathentry kind="output" path="target/classes"/>
 </classpath>

glsp-server/src/main/java/org/eclipse/glsp/example/javaemf/model/TaskListSourceModelStorage.java

@@ -39,6 +39,7 @@ import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
 import java.io.File;
+import java.io.FileWriter;
 import java.io.IOException;
 import java.util.Collections;
 
@@ -74,7 +75,6 @@ public class TaskListSourceModelStorage extends EMFNotationSourceModelStorage {
     *    not in the source model
     */
 
-   private final URI baseModel = URI.createFileURI(new File("BaseModel.pnml").getAbsolutePath());
 
    @Override
    public void loadSourceModel(final RequestModelAction action) {
@@ -84,20 +84,71 @@ public class TaskListSourceModelStorage extends EMFNotationSourceModelStorage {
 
       ResourceSet resourceSet = getOrCreateEditingDomain().getResourceSet();
 
-      System.err.println("1");
-      System.err.println("\nERROR: URI "+ sourceURI + " empty. \n\t at "+ resourceURI +")\n");
+      try{
+         // check how many bytes the inputstream from the url yields before hitting some interrupt
+         if(0 == resourceSet.getURIConverter().createInputStream(resourceURI).available())
+            setupAndLoadNewModel(resourceSet, resourceURI, action);
 
-      if(!resourceSet.getURIConverter().exists(resourceURI, null))
+         else
+            doLoadSourceModel(resourceSet, resourceURI, action);
+      }
+      catch(IOException e)
       {
-         System.err.println("2");
-         System.err.println("\nERROR: URI "+ sourceURI + " empty. \n\t at "+ resourceURI +")\n");
+         System.err.println("\nIO Exception trying to access uri: "+ resourceURI +"\n");
       }
-      else { 
-         System.err.println("3");
-         doLoadSourceModel(resourceSet, resourceURI, action);
-         System.err.println("4");
+   }
+
+
+   private void setupAndLoadNewModel(final ResourceSet resourceSet, final URI sourceURI,
+      final RequestModelAction action)
+   {
+      /*
+       * this function creates a local file from which to load a default model, 
+       *  then deletes that file after loading is finished
+       * 
+       * the added model will not be saved and the file will be gone, so there will in fact not be a file source
+       * 
+       * to actually create the file save it once
+       * 
+       * possibly the same could be achived by manually building a graphical model and translating it into an empty sorce model
+       *  this would avoid the need for additional files
+       */
+      String fileName = sourceURI.lastSegment();
+      int dotIndex = fileName.lastIndexOf(".");
+      if(dotIndex >= 0)
+         fileName = fileName.substring(0,dotIndex);
+
+      String baseModel = 
+         "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\r\n" + //
+         "<pnml xmi:version=\"2.0\" xmlns:xmi=\"http://www.omg.org/XMI\" xmlns=\"http://www.pnml.org/version-2009/grammar/pnml\">\r\n" + //
+         "  <net id=\""+ fileName +"\"/>\r\n" + //
+         //"  </net>\r\n" + //
+         "</pnml>";
+
+
+      // create a server local tempfile for the model to load from
+      URI modelURI = null;
+      File modelFile = null;
+      try{
+         modelFile = new File("model.tmp");
+         FileWriter modelInput = new FileWriter(modelFile);
+         modelInput.write(baseModel);
+         modelInput.close();
+
+         modelURI = URI.createFileURI(modelFile.getAbsolutePath());
       }
-      System.err.println("5");
+      catch(IOException e)
+      {
+         LOGGER.error("Could not create new resource: " + modelURI, e);
+         throw new GLSPServerException("Could not save model to file: " + modelURI, e);
+      }
+
+      // load the file and set the uri to the intended source
+      doLoadSourceModel(resourceSet, modelURI, action);
+      Resource resource = resourceSet.getResource(modelURI, false);
+      resource.setURI(sourceURI);
+      // cleanup temp file
+      modelFile.delete();
    }
 
    /*