java以更实用的方式对目录进行分组
有人能告诉我如何将Scala代码(Java命令式方式)转换成更具功能的方式吗
它是将目录分组,例如总计4GB,将目录/文件细分为4个组,每个组限制1GB,将每个组添加到列表中
object MyMapper {
def main(args: Array[String]) {
var map: Map[String, Long] = Map[String, Long]();
map += ("a" -> 5);
map += ("b" -> 5);
map += ("c" -> 3);
map += ("d" -> 2);
map += ("e" -> 4);
map += ("f" -> 2);
map += ("g" -> 1);
limitMapper(map)
}
def limitMapper(map: Map[String, Long]): Unit = {
var offset = 0L;
var result = Vector[Vector[String]]()
var list = Vector[String]()
val iterator: Iterator[(String, Long)] = map.toVector.iterator
val LIMIT: Int = 10
while (iterator.hasNext) {
val (path, size) = iterator.next()
println((path, size))
offset += size
if (offset > LIMIT) {
offset = size;
result = result :+ list
list = Vector[String]()
}
list = list :+ path
}
//add remaining paths
if (list.size > 0) {
result = result :+ list
list = Vector[String]()
}
println(result)
println(s"LIMIT = $LIMIT")
}
}
Output:
(e,4)
(f,2)
(a,5)
(b,5)
(g,1)
(c,3)
(d,2)
Vector(Vector(e, f), Vector(a, b), Vector(g, c, d))
# 1 楼答案
我不确定这是否是最好的方法。但我会这样做: