Package de.gsi.dataset.utils

Class DataSetUtilsHelper

  • Direct Known Subclasses:
    DataSetUtils
    public class DataSetUtilsHelper
extends java.lang.Object
    Small static helper routines to ease the reading of the DataSetUtils class
    Author:
    rstein

    • Field Summary

      Fields 
      Modifier and Type Field Description
      protected static java.util.concurrent.locks.ReentrantLock BYTE_ARRAY_CACHE_LOCK  
      protected static java.util.WeakHashMap<java.lang.String,​java.util.WeakHashMap<java.lang.Integer,​java.nio.ByteBuffer>> byteArrayCache  
      protected static java.util.concurrent.locks.ReentrantLock STRING_BUFFER_CACHE_LOCK  
      protected static java.util.WeakHashMap<java.lang.String,​java.util.WeakHashMap<java.lang.Integer,​java.lang.StringBuilder>> stringBuilderCache  

    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method Description
      protected static java.nio.ByteBuffer getCachedDoubleArray​(java.lang.String arrayName, int size)  
      protected static java.lang.StringBuilder getCachedStringBuilder​(java.lang.String arrayName, int size)  
      protected static double integralSimple​(DataSet function)  
      protected static double mean​(double[] data)  
      protected static double[] readDoubleArrayFromBuffer​(java.nio.FloatBuffer floatBuffer, java.nio.DoubleBuffer doubleBuffer)  
      protected static void release​(java.lang.String arrayName, java.lang.StringBuilder cachedArray)  
      protected static void release​(java.lang.String arrayName, java.nio.ByteBuffer cachedArray)  
      protected static double rootMeanSquare​(double[] data)  
      static double[] toDoubleArray​(float[] input)  
      static float[] toFloatArray​(double[] input)  
      protected static void writeDoubleArrayAsFloatToByteBuffer​(java.nio.ByteBuffer byteBuffer, double[] doubleBuffer)  
      protected static void writeDoubleArrayToByteBuffer​(java.nio.ByteBuffer byteBuffer, double[] doubleBuffer)  

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Field Detail

      • BYTE_ARRAY_CACHE_LOCK

        protected static final java.util.concurrent.locks.ReentrantLock BYTE_ARRAY_CACHE_LOCK

      • byteArrayCache

        protected static java.util.WeakHashMap<java.lang.String,​java.util.WeakHashMap<java.lang.Integer,​java.nio.ByteBuffer>> byteArrayCache

      • STRING_BUFFER_CACHE_LOCK

        protected static final java.util.concurrent.locks.ReentrantLock STRING_BUFFER_CACHE_LOCK

      • stringBuilderCache

        protected static java.util.WeakHashMap<java.lang.String,​java.util.WeakHashMap<java.lang.Integer,​java.lang.StringBuilder>> stringBuilderCache

    • Constructor Detail

      • DataSetUtilsHelper

        public DataSetUtilsHelper()

    • Method Detail

      • getCachedDoubleArray

        protected static java.nio.ByteBuffer getCachedDoubleArray​(java.lang.String arrayName,
                                                          int size)

      • release

        protected static void release​(java.lang.String arrayName,
                              java.nio.ByteBuffer cachedArray)

      • getCachedStringBuilder

        protected static java.lang.StringBuilder getCachedStringBuilder​(java.lang.String arrayName,
                                                                int size)

      • release

        protected static void release​(java.lang.String arrayName,
                              java.lang.StringBuilder cachedArray)

      • toFloatArray

        public static float[] toFloatArray​(double[] input)
        Parameters:
        input - double array input
        Returns:
        float array output

      • toDoubleArray

        public static double[] toDoubleArray​(float[] input)
        Parameters:
        input - float array input
        Returns:
        double array output

      • writeDoubleArrayToByteBuffer

        protected static void writeDoubleArrayToByteBuffer​(java.nio.ByteBuffer byteBuffer,
                                                   double[] doubleBuffer)

      • writeDoubleArrayAsFloatToByteBuffer

        protected static void writeDoubleArrayAsFloatToByteBuffer​(java.nio.ByteBuffer byteBuffer,
                                                          double[] doubleBuffer)

      • readDoubleArrayFromBuffer

        protected static double[] readDoubleArrayFromBuffer​(java.nio.FloatBuffer floatBuffer,
                                                    java.nio.DoubleBuffer doubleBuffer)

      • integralSimple

        protected static double integralSimple​(DataSet function)

      • mean

        protected static double mean​(double[] data)
        Parameters:
        data - the input vector
        Returns:
        average of vector elements

      • rootMeanSquare

        protected static double rootMeanSquare​(double[] data)
        Parameters:
        data - the input vector
        Returns:
        un-biased r.m.s. of vector elements