org.apache.derby.impl.drda
Class DRDAStatement.DrdaParamState

java.lang.Object
  org.apache.derby.impl.drda.DRDAStatement.DrdaParamState

Enclosing class:

DRDAStatement

private static class DRDAStatement.DrdaParamState
extends java.lang.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 Summary

private int[]	extLst_
private int	extLstEnd_
private int[]	lenLst_
private EXTDTAReaderInputStream	streamedParameter
private byte[]	typeLst_
private int	typeLstEnd_

Constructor Summary

private

DRDAStatement.DrdaParamState()

Method Summary

protected void	addDrdaParam(byte t, int s) addDrdaParam adds a new parameter with its DRDA type and byte length.
protected void	addExtPos(int p) addExtPos marks parameter i as external.
protected void	clear(boolean trim) clear resets the arrays so that new parameters will be added at the beginning.
protected void	drainStreamedParameter() Read the rest of the streamed parameter if not consumed by the executing statement.
protected int	getDrdaLen(int i) getDrdaLen returns the length in bytes of the ith parameter.
protected int	getDrdaParamCount() getDrdaParamCount return the number of parameters added so far (since last clear).
protected byte	getDrdaType(int i) getDrdaType returns a byte that represents the DRDA type of the ith parameter.
protected int	getExtPos(int i) getExtPos returns the actual parameter position of the ith external parameter.
protected int	getExtPosCount() getExtPosCount returns the number of parameters marked as external so far (since last clear).
private static java.lang.Object	growArray(java.lang.Object array)
void	setStreamedParameter(EXTDTAReaderInputStream eis)

Methods inherited from class java.lang.Object

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

Field Detail

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 Detail

DRDAStatement.DrdaParamState

private DRDAStatement.DrdaParamState()

Method Detail

growArray

private static java.lang.Object growArray(java.lang.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 java.io.IOException

Read the rest of the streamed parameter if not consumed by the executing statement. DERBY-3085

Throws:

java.io.IOException

setStreamedParameter

public void setStreamedParameter(EXTDTAReaderInputStream eis)