Utilities.java 文件源码

/**
 * Creating negation expression.
 */
public static NegationContext createNegationContext(final ExprContext expr) {

  final NegationContext negationContext = new NegationContext(new ExprContext());
  final TerminalNodeImpl notNode = new TerminalNodeImpl(new CommonToken(FOLParser.NOT, "not"));

  // Setting context parents.
  notNode.parent = negationContext;
  expr.parent = negationContext;

  // Adding negation expression's children.
  negationContext.addChild(notNode);
  negationContext.addChild(expr);

  return negationContext;
}