checkIDs(): Stop generation of error messages after 100 lines

* Works around performance problems with large models that have
  missing/erroneous IDs
* Note that still all deteced problems will be fixed

Issue-Ref: 4180
Issue-Url: af3#4180



Signed-off-by: Simon Barner <barner@fortiss.org>

org.fortiss.tooling.kernel/src/org/fortiss/tooling/kernel/internal/storage/eclipse/.ratings

 AutoUndoCommandStack.java fc326adf66c6cea2354884cdc240da5f2f82689a GREEN
 EMFTransactionalCommand.java ba4b5bead9768b6ce6c955b9238cd96cb722533c GREEN
 EclipseResourceStorageService.java 5e60ef7628ea2ad4113cfebde939341e1b1f6cf2 GREEN
-ModelContext.java 484298fe527a4b83a6dceaef5dd459f874f8b737 GREEN
+ModelContext.java 54e38337ad607ae2aa9a6d96e2365debf1bd507b YELLOW
 NonDirtyingEMFTransactionalCommand.java d288ebe35d22442c603496b0c917fb99a8febeea GREEN

org.fortiss.tooling.kernel/src/org/fortiss/tooling/kernel/internal/storage/eclipse/ModelContext.java

@@ -251,6 +251,8 @@ class ModelContext implements ITopLevelElement, CommandStackListener {
 			msg += resource.getURI().lastSegment() + "\".\n";
 			msg += "Please report this incident since it indicates a programming error ";
 			msg += "that could result in corrupted model files.\n";
+			int count = 0;
+			final int maxErrorMessages = 100;
 			for(Entry<String, Integer> entry : objWithIdProblem.entrySet()) {
 				Integer id = entry.getValue();
 				if(id == null) {
@@ -260,6 +262,11 @@ class ModelContext implements ITopLevelElement, CommandStackListener {
 				}
 				String name = entry.getKey();
 				msg += "element \"" + name + "\"\n";
+				if(count++ >= maxErrorMessages) {
+					msg += "\n\n*** More than " + maxErrorMessages +
+							" IDs have been fixed. Stopping report. Note that all detected problems have been fixed. ***";
+					break;
+				}
 			}
 			error(ToolingKernelActivator.getDefault(), msg);