How to use

ISubjectControlContextInformationValidator

in

org.eclipse.jface.contentassist

/**
 * Installs this adapter's information validator on the given context frame.
 *
 * @param frame the context frame
 */
public void installValidator(ContextFrame frame) {
  if (fContentAssistSubjectControl != null) {
    if (frame.fValidator instanceof ISubjectControlContextInformationValidator)
      ((ISubjectControlContextInformationValidator)frame.fValidator).install(frame.fInformation, fContentAssistSubjectControl, frame.fOffset);
  } else
    frame.fValidator.install(frame.fInformation, fViewer, frame.fOffset);
}

/**
 * Installs this adapter's information validator on the given context frame.
 *
 * @param frame the context frame
 */
public void installValidator(ContextFrame frame) {
  if (fContentAssistSubjectControl != null) {
    if (frame.fValidator instanceof ISubjectControlContextInformationValidator)
      ((ISubjectControlContextInformationValidator)frame.fValidator).install(frame.fInformation, fContentAssistSubjectControl, frame.fOffset);
  } else
    frame.fValidator.install(frame.fInformation, fViewer, frame.fOffset);
}