Class DRDAStatement.DrdaParamState

java.lang.Object
org.apache.derby.impl.drda.DRDAStatement.DrdaParamState
Enclosing class:
DRDAStatement
private static class DRDAStatement.DrdaParamState extends Object
This class is used to keep track of the statement's parameters as they are received from the client. It uses arrays to track the DRDA type, the length in bytes and the externalness of each parameter. Arrays of int/byte are used rather than ArrayLists of Integer/Byte in order to re-use the same storage each time the statement is executed.

  • Field Details

    • streamedParameter

      private EXTDTAReaderInputStream streamedParameter

    • typeLstEnd_

      private int typeLstEnd_

    • typeLst_

      private byte[] typeLst_

    • lenLst_

      private int[] lenLst_

    • extLstEnd_

      private int extLstEnd_

    • extLst_

      private int[] extLst_

  • Constructor Details

    • DrdaParamState

      private DrdaParamState()

  • Method Details

    • growArray

      private static Object growArray(Object array)

    • clear

      protected void clear(boolean trim)
      clear resets the arrays so that new parameters will be added at the beginning. No initialization or releasing of storage takes place unless the trim argument is true.
      Parameters:
      trim - - if true; release excess storage

    • addDrdaParam

      protected void addDrdaParam(byte t, int s)
      addDrdaParam adds a new parameter with its DRDA type and byte length. The arrays are automatically grown if needed.
      Parameters:
      t - a byte value, the DRDA type of the parameter being added
      s - an int value, the length in bytes of the parameter being added

    • getDrdaParamCount

      protected int getDrdaParamCount()
      getDrdaParamCount return the number of parameters added so far (since last clear).
      Returns:
      an int value, the number of parameters

    • getDrdaType

      protected byte getDrdaType(int i)
      getDrdaType returns a byte that represents the DRDA type of the ith parameter.
      Parameters:
      i - an int value, a parameter position (zero-based)
      Returns:
      a byte value, the DRDA type

    • getDrdaLen

      protected int getDrdaLen(int i)
      getDrdaLen returns the length in bytes of the ith parameter.
      Parameters:
      i - an int value, a parameter position (zero-based)
      Returns:
      an int value

    • addExtPos

      protected void addExtPos(int p)
      addExtPos marks parameter i as external. The array is grown as needed.
      Parameters:
      p - an int value, a parameter position (zero-based)

    • getExtPosCount

      protected int getExtPosCount()
      getExtPosCount returns the number of parameters marked as external so far (since last clear).
      Returns:
      an int value, the number of external parameters.

    • getExtPos

      protected int getExtPos(int i)
      getExtPos returns the actual parameter position of the ith external parameter.
      Parameters:
      i - an int value, index into the list of external parameters, zero-based
      Returns:
      an int value, the parameter position of the ith external parameter (zero-based)

    • drainStreamedParameter

      protected void drainStreamedParameter() throws IOException
      Read the rest of the streamed parameter if not consumed by the executing statement. DERBY-3085
      Throws:
      IOException

    • setStreamedParameter

      public void setStreamedParameter(EXTDTAReaderInputStream eis)