de.gsi.dataset.utils

Class DataSetUtilsHelper

java.lang.Object

de.gsi.dataset.utils.DataSetUtilsHelper

Direct Known Subclasses:

DataSetSerialiser, DataSetUtils

public class DataSetUtilsHelper
extends Object

Small static helper routines to ease the reading of the DataSetUtils class

Author:

rstein

Field Summary

Fields

Modifier and Type	Field and Description
protected static ReentrantLock	BYTE_ARRAY_CACHE_LOCK
protected static WeakHashMap<String,WeakHashMap<Integer,ByteBuffer>>	byteArrayCache
protected static ReentrantLock	STRING_BUFFER_CACHE_LOCK
protected static WeakHashMap<String,WeakHashMap<Integer,StringBuilder>>	stringBuilderCache

Constructor Summary

Constructors

Constructor and Description
DataSetUtilsHelper()

Method Summary

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

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 ReentrantLock BYTE_ARRAY_CACHE_LOCK

byteArrayCache

protected static WeakHashMap<String,WeakHashMap<Integer,ByteBuffer>> byteArrayCache

STRING_BUFFER_CACHE_LOCK

protected static final ReentrantLock STRING_BUFFER_CACHE_LOCK

stringBuilderCache

protected static WeakHashMap<String,WeakHashMap<Integer,StringBuilder>> stringBuilderCache

Constructor Detail

DataSetUtilsHelper

public DataSetUtilsHelper()

Method Detail

getCachedDoubleArray

protected static ByteBuffer getCachedDoubleArray(String arrayName,
                                                 int size)

getCachedStringBuilder

protected static StringBuilder getCachedStringBuilder(String arrayName,
                                                      int size)

integralSimple

protected static double integralSimple(DataSet function)

mean

protected static double mean(double[] data)

Parameters:

data - the input vector

Returns:

average of vector elements

readDoubleArrayFromBuffer

protected static double[] readDoubleArrayFromBuffer(FloatBuffer floatBuffer,
                                                    DoubleBuffer doubleBuffer)

release

protected static void release(String arrayName,
                              ByteBuffer cachedArray)

release

protected static void release(String arrayName,
                              StringBuilder cachedArray)

rootMeanSquare

protected static double rootMeanSquare(double[] data)

Parameters:

data - the input vector

Returns:

un-biased r.m.s. of vector elements

toDoubleArray

public static double[] toDoubleArray(float[] input)

Parameters:

input - float array input

Returns:

double array output

toFloatArray

public static float[] toFloatArray(double[] input)

Parameters:

input - double array input

Returns:

float array output

writeDoubleArrayAsFloatToByteBuffer

protected static void writeDoubleArrayAsFloatToByteBuffer(ByteBuffer byteBuffer,
                                                          double[] doubleBuffer,
                                                          int nSamples)

writeDoubleArrayToByteBuffer

protected static void writeDoubleArrayToByteBuffer(ByteBuffer byteBuffer,
                                                   double[] doubleBuffer,
                                                   int nSamples)