How to programatically set String input of TextEdi

Question

What I want: I want to write JUnit tests for my Eclipse editor plug-in. For this I want to set up an instance of my TextEditor extension. Then I want to set the input of this TextEditor from a String, so that the content of the String is the input of the editor instance. Then I want to run some tests and assert that the editor marks errors and so on.

Where I fail: I don't know how to set up the input of the editor from a String. The only function the editor has to do so is setInput(IEditorInput input), but I don't know how to create an ÌEditorInput with a String as it's content.

Is there any possibility to do so and, if not, any other way to set the input of the editor to a given String?

Answer 1

You can either create a (workspace) file as Greg suggested or implement a specialized IEditorInput and open a text editor with this input.

For example:

// uninteresting methods left out for brevity

class StringEditorInput implements IStorageEditorInput {
  @Override
  public boolean exists() {
    return true;
  }

  @Override
  public IStorage getStorage() throws CoreException {
    return new StringStorage();
  }
}

class StringStorage implements IStorage {
  @Override
  public InputStream getContents() throws CoreException {
    return new ByteArrayInputStream( "Hello editor!".getBytes( StandardCharsets.UTF_8 ) );
  }
}

String editorId = "org.eclipse.ui.DefaultTextEditor";
IWorkbenchPage page = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage();
IEditorPart editor = IDE.openEditor( page , new StringEditorInput(), editorId );