xflminterface IF_OperandComparer : public XF_RefCount

This class represents an operand comparer.  XFLAIM does not provide an implementation of this interface.  It is up to the application to provide an implementation.  It is a way for an application to plug in a callback mechanism that allows it to provide specialized operators in query expressions.  It is passed into a query via the IF_Query::addOperator method.

Method Summary
RCODE compare - Compare data from two input streams - which are a left operand and a right operand.

 

Method Detail

compare

    RCODE compare(

        IF_PosIStream *    pLeftOperandStream,

        IF_PosIStream *    pRightOperandStream,

        FLMINT *             piCompare);

This method compares data from the two input streams.

    Parameters In:

IF_PosIStream * pLeftOperandStream Input stream that contains the data in the left operand.  Operand data is accessed by calling the appropriate methods on the stream object.
IF_PosIStream * pRightOperandStream Input stream that contains the data in the right operand.  Operand data is accessed by calling the appropriate methods on the stream object.

    Parameters Out:

FLMINT * piCompare Application should return results of comparison here, as follows:
  • -1 - pLeftOperandStream < pRightOperandStream
  • 0 - pLeftOperandStream = pRightOperandStream
  • 1 - pLeftOperandStream > pRightOperandStream

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