eclipse - PropertyChangeListener 验证

Question

我正在尝试从 Eclipse 首选项页面实现一个视图，并且在某些字段中，此方法（performStringSubstitution）不起作用，因为 StringFieldEditor 之前进行了验证并且不授予 label.setText（）的权限，我将不胜感激. `

public void propertyChange(PropertyChangeEvent event)
    {

         /*Solve Eclipse variable method (${workspace_loc},${project_loc},...)*/

         String dir = Activator.getDefault().getPreferenceStore()
                                         .getString(event.getNewValue().toString());

         IStringVariableManager manager = VariablesPlugin.getDefault()
                                        .getStringVariableManager();  
          try {
                String solvePathUpdate = manager.performStringSubstitution(dir);
                label.setText(solvePathUpdate);
              }
                catch (CoreException e)
                    {
                        // TODO Auto-generated catch block
                       /* Creating the method print console */

                    }

    }