Apache Commons CLI 选项解析器可以忽略未知的命令行选项吗? [英] Can Apache Commons CLI options parser ignore unknown command-line options?

问题描述

我正在编写一个 Java 应用程序，它接受命令行参数，这些参数是使用 Apache Commons CLI 和 GnuParser 处理的.出于一些不太有趣的原因，我希望它默默地忽略未知的命令行选项，而不是抛出 ParseException，但我没有看到这样做的方法.我看到 GnuParser.parse() 上有一个 stopAtNonOption 布尔选项，但我想要的更像是 ignoreAtNonOption，它会在遇到未知标记后继续处理选项.

I am writing a Java application that takes command line arguments which are processed using Apache Commons CLI with the GnuParser. For reasons that are not interesting to get into, I would like it to silently ignore unknown command line options instead of throwing a ParseException but I don't see a way to do that. I see that there is a stopAtNonOption boolean option on GnuParser.parse() but what I want is more like ignoreAtNonOption where it will keep processing options after encountering an unknown token.

我可以实现我自己的解析器来完成这个，但我很惊讶没有内置这个功能，所以我想我会在走这条路之前检查一下.

I could implement my own parser to accomplish this but I'm surprised there isn't this functionality built in so I thought I'd check before going down that road.

我正在谈论的示例代码:

Example code for what I'm talking about:

try {
  CommandLine commandLine = parser.parse(options, args);
  // stopAtNonOption set to true (below) is also not what I want
  // CommandLine commandLine = parser.parse(options, args, true);
} catch (ParseException e) {
  LOG.error("error parsing arguments", e);
  throw new RuntimeException(e);
}

推荐答案

这对我有用(其他解析器也可以派生):

This works for me (other parsers can be derived, too):

public class ExtendedGnuParser extends GnuParser {

    private boolean ignoreUnrecognizedOption;

    public ExtendedGnuParser(final boolean ignoreUnrecognizedOption) {
        this.ignoreUnrecognizedOption = ignoreUnrecognizedOption;
    }

    @Override
    protected void processOption(final String arg, final ListIterator iter) throws     ParseException {
        boolean hasOption = getOptions().hasOption(arg);

        if (hasOption || !ignoreUnrecognizedOption) {
            super.processOption(arg, iter);
        }
    }

}

这篇关于Apache Commons CLI 选项解析器可以忽略未知的命令行选项吗?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！