Scala本地返回？ [英] Scala local return?

问题描述

我刚刚发现 return 在下面的闭包将从函数 findPackage

I've just discovered that returns in following closure will return from function findPackage

def findPackage(name: String, suffix: Option[String] = None): Path = {
    logger.debug("Looking for package {} with suffix {}", name, suffix)
    val path: Path = using(Files.newDirectoryStream(appDir)) {dirs =>
        for (val path <- dirs) {
            val matcher = packagePattern.matcher(path.getFileName.toString)
            if (matcher.matches() && matcher.group(1).equals(name))
                if (suffix.isDefined) {
                    if (matcher.group(2) != null && matcher.group(2).equals(suffix.get))
                        return path
                } else
                    return path
        }
        throw new PackageNotFoundException(this, name, suffix)
    }
    logger.debug("Found package is {}", path)
    path
}

我能以某种方式做一个本地回来吗？谢谢。

Can I somehow do a local return please? Thank you.

推荐答案

或者你可以摆脱你的循环，替换为你想做的：find

Or you could get rid of your loop and replace it with what you're trying to do: "find"

def findPackage(name: String, suffix: Option[String] = None): Path = {
    logger.debug("Looking for package {} with suffix {}", name, suffix)

    def matching(path : Path) : Boolean = {
        val matcher = packagePattern.matcher(path.getFileName.toString)
        matcher.matches && matcher.group(1).equals(name) && (!suffix.isDefined || (matcher.group(2) != null && matcher.group(2).equals(suffix.get))
    }

    val path: Path = using(Files.newDirectoryStream(appDir)) {dirs =>
       dirs find matching getOrElse {throw new PackageNotFoundException(this, name, suffix)}
    }

    logger.debug("Found package is {}", path)
    path
}

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