Class DataReader


  • public class DataReader
    extends java.lang.Object
    Reads items with a given data type from a buffer into an array.
    Since:
    20 Jun 2013
    • Constructor Summary

      Constructors 
      Constructor Description
      DataReader​(DataType dataType, int nelPerItem, int nItem)
      Constructor.
    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      java.lang.Object createValueArray()
      Creates a workspace array which can contain a value read for one record.
      int getRecordSize()
      Returns the size in bytes of one record as stored in the data buffer.
      void readValue​(Buf buf, long offset, java.lang.Object valueArray)
      Reads a value from a data buffer into a workspace array.
      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
    • Constructor Detail

      • DataReader

        public DataReader​(DataType dataType,
                          int nelPerItem,
                          int nItem)
        Constructor.
        Parameters:
        dataType - data type
        nelPerItem - number of dataType elements per read item; usually 1 except for character data
        nItem - number of items of given data type in the array, for scalar records it will be 1
    • Method Detail

      • createValueArray

        public java.lang.Object createValueArray()
        Creates a workspace array which can contain a value read for one record. The return value will be an array of a primitive type or String.
        Returns:
        workspace array for this reader
      • readValue

        public void readValue​(Buf buf,
                              long offset,
                              java.lang.Object valueArray)
                       throws java.io.IOException
        Reads a value from a data buffer into a workspace array.
        Parameters:
        buf - data buffer
        offset - byte offset into buf of data start
        valueArray - object created by createValueArray into which results will be read
        Throws:
        java.io.IOException
      • getRecordSize

        public int getRecordSize()
        Returns the size in bytes of one record as stored in the data buffer.
        Returns:
        record size in bytes