public void doSave(@Optional IProgressMonitor monitor) throws IOException, InterruptedException {
		if (monitor == null) {
			monitor = new NullProgressMonitor();
		}
		persistChange(PersistType.UPDATE);
		dirtyable.setDirty(false);
	}

	private void persistChange(final PersistType type) throws IOException, InterruptedException {
		// Uses this format 'testcase name'|'Inbound meta filename'|
		// 'Outbound meta filename'|'Mapping meta filename'|
		// 'Inbound data filename'|'Outbound data filename'
		// maps to Testcase object
		Display display = parent.getDisplay();
		if (!(display==null || display.isDisposed())) {
			display.asyncExec(new Runnable () {
				public void run() {
					FileWriter outputStream = null;
					try {
						outputStream = new FileWriter("../workspace/com.hsbcib.grds.testui/grdstestcase.dat");
					} catch (IOException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					}
					TestCase original = testCaseComposite.getOriginalTestCase();
					TestCase modified = testCaseComposite.getModifiedTestCase();
					List<TestCase> testcases = TestCaseRepositoryFactory.getTestCaseRepository().getAllTestCases();
					BufferedWriter writer = new BufferedWriter(outputStream);
					try {
						boolean madeChange = false;
						String record = "";
						for(int i=0; i<testcases.size(); i++){
							TestCase aCase = testcases.get(i);
							if(original==null) {
								TestCase aNewCase = new TestCase();
								aNewCase.setName("New Case");
								record = makeTestCaseRecord(aNewCase);
								TestCaseRepositoryFactory.getTestCaseRepository().getAllTestCases().add(aNewCase);									
								writer.write(record);
								break;
							} else if(original != null && original.getName().equals(aCase.getName())) {
								if(type==PersistType.DELETE) {
									TestCaseRepositoryFactory.getTestCaseRepository().getAllTestCases().remove(i);
									continue;
								} else if (type==PersistType.UPDATE) {
									if(!madeChange) {
										record = makeTestCaseRecord(modified);
										TestCaseRepositoryFactory.getTestCaseRepository().getAllTestCases().set(i, modified);
										madeChange=true;
									} else {
										record = makeTestCaseRecord(aCase);
										TestCaseRepositoryFactory.getTestCaseRepository().getAllTestCases().set(i, aCase);
									}
								}
							} else {
								record = makeTestCaseRecord(aCase);
							}
							writer.write(record);
						}
						if (type==PersistType.CLONE) {
							String name = modified.getName();
							// This only works up to 10 clone names, but not unique on name anyway
							if(name.substring(name.length()-1, name.length()).matches("\\d")) {
								int cloneno = Integer.parseInt(name.substring(name.length()-1, name.length()));
								modified.setName(name.substring(0,name.length()-1)+Integer.valueOf(++cloneno));
							} else {
								modified.setName(name+"0");
							}					
							record = makeTestCaseRecord(modified);
							TestCaseRepositoryFactory.getTestCaseRepository().getAllTestCases().add(modified);									
							writer.write(record);
						} else if (type==PersistType.CREATE) {
							TestCase aNewCase = new TestCase();
							aNewCase.setName("New Case");
							record = makeTestCaseRecord(aNewCase);
							TestCaseRepositoryFactory.getTestCaseRepository().getAllTestCases().add(aNewCase);									
							writer.write(record);
						}
						writer.close();
					} catch (IOException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					}
				}
			});
		}
	}

TestCaseRepositoryFactory.getTestCaseRepository().getAllTestCases().set

		// Test case name column
		final TableViewerColumn nameColumn = new TableViewerColumn(testCaseViewer, SWT.NONE);
		nameColumn.getColumn().setText("Test Case Name");
		tableColumnLayout.setColumnData(nameColumn.getColumn(), new ColumnWeightData(100));

		ObservableListContentProvider contentProvider = new ObservableListContentProvider();

		testCaseViewer.setContentProvider(contentProvider);

		IObservableMap[] attributes = BeansObservables.observeMaps(
				contentProvider.getKnownElements(), TestCase.class, new String[] { "name" });
		testCaseViewer.setLabelProvider(new ObservableMapLabelProvider(attributes));

		testCaseViewer.setInput(TestCaseRepositoryFactory.getTestCaseRepository().getAllTestCases());

		GridLayoutFactory.fillDefaults().generateLayout(parent);