Scala ListBuffer类代码示例

//设置package包名称以及导入依赖的类
import sbt._
import collection.mutable.ListBuffer



object RecordingLogger extends Logger {
  private val buffer = ListBuffer[String]()

  def hasErrors = buffer.nonEmpty

  def readAndClear() = {
    val res = buffer.mkString("\n")
    buffer.clear()
    res
  }

  def clear() {
    buffer.clear()
  }

  def log(level: Level.Value, message: => String) =
    if (level == Level.Error) {
      buffer += message
    }

  // we don't log success here
  def success(message: => String) = ()

  // invoked when a task throws an exception. invoked late, when the exception is logged, i.e.
  // just before returning to the prompt. therefore we do nothing: storing the exception in the
  // buffer would happen *after* the `handleFailure` reads the buffer.
  def trace(t: => Throwable) = ()
} 

//设置package包名称以及导入依赖的类
def init[A](l: List[A]): List[A] = 
  l match { 
    case Nil => sys.error("init of empty list")
    case Cons(_,Nil) => Nil
    case Cons(h,t) => Cons(h,init(t))
  }
def init2[A](l: List[A]): List[A] = {
  import collection.mutable.ListBuffer
  val buf = new ListBuffer[A]
  @annotation.tailrec
  def go(cur: List[A]): List[A] = cur match {
    case Nil => sys.error("init of empty list")
    case Cons(_,Nil) => List(buf.toList: _*)
    case Cons(h,t) => buf += h; go(t)
  }
  go(l)
} 

//设置package包名称以及导入依赖的类
package xyz.hyperreal.energize

import java.sql._

import collection.mutable.ListBuffer

class Relation( env: Environment, rs: ResultSet ) extends Iterable[IndexedSeq[AnyRef]] {
	private val md = rs.getMetaData
	private var cur: List[IndexedSeq[AnyRef]] = _

	val columnCount = md.getColumnCount
	val columns =
		for (i <- 1 to columnCount)
			yield
				Col( md.getTableName(i), nameOut(md.getColumnName(i)) )
	val columnMap = Map( (for (i <- 0 until columnCount) yield (columns(i), i)): _* )
	val rows = {
		val buf = new ListBuffer[IndexedSeq[AnyRef]]

		while (rs.next)
			buf += (for (i <- 1 to columnCount)
				yield
					rs.getObject( i ))

		buf.toList
	}

	def iterator = rows.iterator

	def next =
		if (cur eq null)
			if (rows == Nil)
				false
			else {
				cur = rows
				true
			}
		else if (cur.tail == Nil)
			false
		else {
			cur = cur.tail
			true
		}

	def get( index: Int ) = cur.head( index )

	def get( table: String, column: String ): Option[AnyRef] = {
		columnMap get Col(env.db.desensitize(table), env.db.desensitize(column)) map get
	}

	def getLong( table: String, column: String ) = get( table, column ).get.asInstanceOf[Long]

	override def toString =
		columns.toString + rows
}

case class Col( table: String, name: String ) 

//设置package包名称以及导入依赖的类
package gui.animations

import java.awt.Graphics2D
import java.awt.AlphaComposite

import collection.mutable.ListBuffer
import util.Random

import game_mechanics.path.{Waypoint,CellPos}
import gui._



object SnowAnimation
{
    val rng = new Random()
}

class SnowAnimation( pos : CellPos, radius : Double ) extends Animatable
{
    
    import SnowAnimation._
    val size            = MapPanel.cellsize.toDouble
    val origin          = (pos.toDouble + new Waypoint(0.5,0.5)) * size
    val duration        = 7.0
    timer               = duration
    val particle_amount = 30
    val particles       = new ListBuffer[Waypoint]()
    val fall_distance   = 20

    for( i <- 0 until particle_amount )
    {
        // Uniform disk distribution
        val r      = rng.nextDouble
        val theta  = rng.nextDouble * 2 * Math.PI
        val x      = Math.sqrt( r ) * Math.cos( theta ) * radius * size
        val y      = Math.sqrt( r ) * Math.sin( theta ) * radius * size
        particles += new Waypoint( x + origin.x, y + origin.y - fall_distance )
    }

    override def draw(g: Graphics2D): Unit = {
        g.setColor( Colors.white )
        val alpha = (timer / duration).toFloat
        g.setComposite(
            AlphaComposite.getInstance( AlphaComposite.SRC_OVER, alpha ) )
        val movement = (1.0 - timer / duration) * fall_distance
        for( particle <- particles ) {
            g.drawRect( particle.x.toInt, particle.y.toInt + movement.toInt,
                1, 1 )
        }
    }
} 

//设置package包名称以及导入依赖的类
package gui.animations

import collection.mutable.ListBuffer
import util.Random

import java.awt.Graphics2D

import game_mechanics.path.Waypoint
import gui._

class SmokeAnimation(origin: Waypoint) extends Animatable
{
    

    val duration = 2.0
    val rng      = new Random
    timer        = duration

    val particles = new ListBuffer[Waypoint]

    for( i <- 0 until 30 )
    {
        val theta = rng.nextDouble * 2 * Math.PI
        particles += new Waypoint( Math.cos( theta ), Math.sin( theta ) )
    }

    override def draw(g: Graphics2D) : Unit = {
        val interp = 1 - timer / duration
        g.setColor( Colors.lightGrey )
        for( particle <- particles )
        {
            val pos = (origin + particle * interp * 1.5) * MapPanel.cellsize
            g.fillOval(
                pos.x.toInt, pos.y.toInt,
                (MapPanel.cellsize * (1-interp)).toInt,
                (MapPanel.cellsize * (1-interp)).toInt )
        }
    }
} 

//设置package包名称以及导入依赖的类
package gui.animations

import java.awt.Graphics2D
import java.awt.AlphaComposite

import collection.mutable.ListBuffer
import gui._
import util.Random

import game_mechanics.path.{Waypoint,CellPos}



object BuffAnimation
{
    val rng = new Random()
}

class BuffAnimation( pos : CellPos, radius : Double ) extends Animatable
{
    import BuffAnimation._
    val size            = MapPanel.cellsize.toDouble
    val origin          = (pos.toDouble + new Waypoint(0.5,0.5)) * size
    val duration        = 7.0
    timer               = duration
    val particle_amount = 30
    val particles       = new ListBuffer[Waypoint]()
    val fall_distance   = 20

    for( i <- 0 until particle_amount )
    {
        // Uniform disk distribution
        val r      = rng.nextDouble
        val theta  = rng.nextDouble * 2 * Math.PI
        val x      = Math.sqrt( r ) * Math.cos( theta ) * radius * size
        val y      = Math.sqrt( r ) * Math.sin( theta ) * radius * size
        particles += new Waypoint( x + origin.x, y + origin.y - fall_distance )
    }

    override def draw(g: Graphics2D): Unit = {
        g.setColor( Colors.blue )
        val alpha = (timer / duration).toFloat
        g.setComposite(
            AlphaComposite.getInstance( AlphaComposite.SRC_OVER, alpha ) )
        val movement = timer / duration * fall_distance
        for( particle <- particles ) {
            g.drawString( "+",
                particle.x.toInt, particle.y.toInt + movement.toInt )
        }
    }
} 

//设置package包名称以及导入依赖的类
import org.scalatest.FlatSpec
import collection.mutable.ListBuffer

class UsingFixture extends FlatSpec {

  def fixture =
    new {
      val builder = new StringBuilder("ScalaTest is ")
      val buffer = new ListBuffer[String]
    }

  "Testing" should "be easy" in {
    val f = fixture
    f.builder.append("easy!")
    assert(f.builder.toString === "ScalaTest is easy!")
    assert(f.buffer.isEmpty)
    f.buffer += "sweet"
  }

  it should "be fun" in {
    val f = fixture
    f.builder.append("fun!")
    assert(f.builder.toString === "ScalaTest is fun!")
    assert(f.buffer.isEmpty)
  }
} 

//设置package包名称以及导入依赖的类
import org.scalatest.FlatSpec
import org.scalatest.BeforeAndAfter
import collection.mutable.ListBuffer

class UsingBeforeAfter extends FlatSpec with BeforeAndAfter {

  val builder = new StringBuilder
  val buffer = new ListBuffer[String]

  before {
    builder.append("ScalaTest is ")
  }

  after {
    builder.clear()
    buffer.clear()
  }

  "Testing" should "be easy" in {
    builder.append("easy!")
    assert(builder.toString === "ScalaTest is easy!")
    assert(buffer.isEmpty)
    buffer += "sweet"
  }

  it should "be fun" in {
    builder.append("fun!")
    assert(builder.toString === "ScalaTest is fun!")
    assert(buffer.isEmpty)
  }
} 

//设置package包名称以及导入依赖的类
package play.modules.swagger.util

import collection.mutable.ListBuffer
import org.slf4j.{LoggerFactory, Logger}


object SwaggerContext {
  private val LOGGER = LoggerFactory.getLogger("play.modules.swagger.util.SwaggerContext")

  var suffixResponseFormat = true

  private val classLoaders = ListBuffer.empty[ClassLoader]
  registerClassLoader(this.getClass.getClassLoader)

  def registerClassLoader(cl: ClassLoader) = this.classLoaders += cl

  def loadClass(name: String) = {
    var clazz: Class[_] = null

    for (classLoader <- classLoaders.reverse) {
      if(clazz == null) {
        try {
          clazz = Class.forName(name, true, classLoader)
        } catch {
          case e: ClassNotFoundException => LOGGER.debug("Class not found in classLoader " + classLoader)
        }
      }
    }

    if(clazz == null)
      throw new ClassNotFoundException("class " + name + " not found")

    clazz
  }
} 

//设置package包名称以及导入依赖的类
package h3

import h3.Point4d
import collection.mutable.ListBuffer
import Config.NULL_PARENT

class Node(val node_idc: Long, val parent_idc: Long = NULL_PARENT, 
        val depthc: Int = 0, val tree_sizec: Int = 1, val radiusc: Double = 0, 
        val areac: Double = 0) {

    var node_id: Long = node_idc
    var parent: Long = parent_idc
    
    //var children: ListBuffer[Node] = ListBuffer.empty[Node]
    var children: List[Node] = List[Node]()
    var depth: Int = depthc
    var tree_size: Int = tree_sizec
    var radius: Double = radiusc
    var area: Double = areac
    var band: Int = -1
    var theta: Double = 0
    var phi: Double = 0
    var coord: Point4d = new Point4d()
    
    def to_string():String = {
        return s"$node_id, " + 
               s"parent: $parent, " +
               s"children: " + children.map { n => n.node_id } + ", " +
               s"depth: $depth, " +
               s"tree_size: $tree_size, " +
               f"radius: $radius, " + 
               s"area: $area, " + 
               s"band: $band, " + 
               s"theta: $theta, " + 
               s"phi: $phi, " + 
               "coord: " + coord.to_string()
    }
    
} 

//设置package包名称以及导入依赖的类
package emc.rna

import collection.mutable.ListBuffer

object Ribosome {

  type PeptideChain = Seq[AminoAcid]

  
  def decode(rna: RNA, rf: Int = 0): Seq[PeptideChain] = {

    // input parameter rna ia an indexed seq, i.e. immutable
    var started: Boolean = false
    var sequence: ListBuffer[PeptideChain] = ListBuffer.empty
    var chain: ListBuffer[AminoAcid] = ListBuffer.empty

    for (codon <- rna.codons(rf)) codon match {
      case Codon.Start =>
        chain += codon.aminoAcid
        started = true

      case Codon.Stop(_, _, _) =>
        if (started) {
          sequence += chain
          chain = ListBuffer.empty
        }
      case codon: Codon =>
        if (started) {
          chain += codon.aminoAcid
        }
    }

    if (chain.nonEmpty) sequence += chain
    sequence
  }
} 

//设置package包名称以及导入依赖的类
package pl.fermich.analysis.signal

import pl.fermich.analysis.data.DailyPrice
import collection.mutable.ListBuffer
import pl.fermich.analysis.indicator.IndicatorConverters._

case class SignalDetector(val priceData: List[DailyPrice]) {

  def CD_HISTOGRAM(secLong: List[DailyPrice]): List[TradingSignal] = {
    val signals = ListBuffer[TradingSignal]()
    val convs = priceData CONV_DIV secLong

    convs.reduceLeft((c1, c2) => {
      if (c1.value < 0 && c2.value >= 0) signals += TradingSignal(c1.date, SignalType.SELL)
      if (c1.value > 0 && c2.value <= 0) signals += TradingSignal(c1.date, SignalType.BUY)
      c2
    })
    signals.toList
  }

  def TRAILING_STOP(threshold: Double): Option[TradingSignal] = {
    val maxDailyPrices = priceData.scanRight(DailyPrice(0L, 0.0)){ case(currentPrice, lastMaxPrice) =>
      if(currentPrice.value < lastMaxPrice.value) DailyPrice(currentPrice.date, lastMaxPrice.value)
      else currentPrice
    }.init

    val rocs = priceData CONV_DIV_ROC maxDailyPrices
    val trailingStop = rocs.reverse.find(_.value.abs >= threshold)
    trailingStop match {
      case Some(trailingStop) => Some(TradingSignal(trailingStop.date, SignalType.SELL))
      case _ => None
    }
  }

  def BREAKOUT(upperPrices: List[DailyPrice]): List[TradingSignal] = {
    val signals = ListBuffer[TradingSignal]()
    val joined = priceData zip upperPrices

    joined.foreach{ case(price, upPrice) => {
      require(price.date == upPrice.date, "Inconsistent data! Wrong Dates during BREAKOUT search!")
      if (price.value < upPrice.value) signals += TradingSignal(upPrice.date, SignalType.BUY)
    }}
    signals.toList
  }

  def BREAKDOWN(lowerPrices: List[DailyPrice]): List[TradingSignal] = {
    val signals = ListBuffer[TradingSignal]()
    val joined = priceData zip lowerPrices

    joined.foreach{ case(price, lowPrice) => {
      require(price.date == lowPrice.date, "Inconsistent data! Wrong Dates during BREAKDOWN search!")
      if (price.value > lowPrice.value) signals += TradingSignal(lowPrice.date, SignalType.SELL)
    }}
    signals.toList
  }

}