package spark

import java.io._

import scala.collection.mutable.ArrayBuffer

object Utils {
  def serialize[T](o: T): Array[Byte] = {
    val bos = new ByteArrayOutputStream
    val oos = new ObjectOutputStream(bos)
    oos.writeObject(o)
    oos.close
    return bos.toByteArray
  }

  def deserialize[T](bytes: Array[Byte]): T = {
    val bis = new ByteArrayInputStream(bytes)
    val ois = new ObjectInputStream(bis)
    return ois.readObject.asInstanceOf[T]
  }

  def deserialize[T](bytes: Array[Byte], loader: ClassLoader): T = {
    val bis = new ByteArrayInputStream(bytes)
    val ois = new ObjectInputStream(bis) {
      override def resolveClass(desc: ObjectStreamClass) =
        Class.forName(desc.getName, false, loader)
    }
    return ois.readObject.asInstanceOf[T]
  }

  def isAlpha(c: Char) = {
    (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z')
  }

  def splitWords(s: String): Seq[String] = {
    val buf = new ArrayBuffer[String]
    var i = 0
    while (i < s.length) {
      var j = i
      while (j < s.length && isAlpha(s.charAt(j))) {
        j += 1
      }
      if (j > i) {
        buf += s.substring(i, j);
      }
      i = j
      while (i < s.length && !isAlpha(s.charAt(i))) {
        i += 1
      }
    }
    return buf
  }
}