How to use

isValid

method

in

org.eclipse.debug.ui.AbstractLaunchConfigurationTab

@Override public boolean isValid(ILaunchConfiguration launchConfig) {
  try {
    return super.isValid(launchConfig) && new File(launchConfig.getAttribute(DSPPlugin.ATTR_DSP_CMD, "/letshopenofileevergetthisname")).canExecute(); //$NON-NLS-1$
  } catch (CoreException e) {
    AcutePlugin.logError(e);
    setErrorMessage(e.getMessage());
    return false;
  }
}

@Override public boolean isValid(ILaunchConfiguration launchConfig) {
  if (!super.isValid(launchConfig)) {
    return false;
  }
  String projectName;
  try {
    projectName = launchConfig.getAttribute(DotnetRunDelegate.PROJECT_FOLDER, ""); //$NON-NLS-1$
    if (projectName.isEmpty()) {
      return false;
    }
    return Tester.isDotnetProject(ResourcesPlugin.getWorkspace().getRoot().getProject(projectName));
  } catch (CoreException e) {
    AcutePlugin.logError(e);
    setErrorMessage(e.getMessage());
    return false;
  }
}

if (!tab.isValid(config)) {
  setErrorMessage(tab.getErrorMessage());
  return false;
  if (!tab.isValid(config)) {
    return false;

@Override
public boolean isValid(ILaunchConfiguration launchConfig) {
  if (fAllTargets == null || isDirty()) {
    if (getErrorMessage() != null && !isDirty()) {
      // error in parsing;
      return false;
    }
    // targets not up to date and no error message...we have not parsed recently
    initializeFrom(launchConfig);
    if (getErrorMessage() != null) {
      // error in parsing;
      return false;
    }
  }
  setErrorMessage(null);
  return super.isValid(launchConfig);
}