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BUG#: 9928

TITLE: Initial FQL implementation per DMTF specification DSP0212

DESCRIPTION: Commit of initial FQL (Filter Query Language)
implementation including 1) FQL parser and evaluator, 2 FQL integration
into CIMOperationRequestDispatcher.cpp, 3)FQL unit and end-end tests
in FQL/tests/Parser and FQL/tests/clitest and FQL tests added to
cimcli tests in src/Clients/cimcli/tests/Makefile

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#ifndef Pegasus_FQLOperation_h
#define Pegasus_FQLOperation_h

#include <Pegasus/Common/Config.h>
#include <Pegasus/FQL/Linkage.h>

PEGASUS_NAMESPACE_BEGIN

/** Represents FQL operators.

    These operators include the following:

    <ul>
        <li>OR</li>
        <li>AND</li>
        <li>NOT</li>
        <li>=</li>
        <li>&lt;&gt;</li>
        <li>&lt;</li>
        <li>&le;</li>
        <li>&gt;</li>
        <li>&ge;</li>
        <li>IS NULL</li>
        <li>IS NOT NULL</li>
        <li>IS TRUE</li>
        <li>IS NOT TRUE</li>
        <li>IS FALSE</li>
        <li>IS NOT FALSE</li>
    </ul>

    Here's an example of a query that uses some of these operations.

    <pre>
        x &gt; 10 OR y &le; 1.5) OR z = 19 AND name IS NOT NULL
    </pre>

    As the parser recognizes these operations, it adds the corresponding
    FQLOperation enumeration tag to the FQLQueryStatement by
    calling FQLQueryStatement::appendOperation().

    Operators may be converted to string by calling FQLOperationToString().

    Note that in expressions like this one:

    <pre>
        count IS TRUE
    </pre>

    The IS operator is NOT treated as a binary operator (which would take
    count and TRUE as its operands). Instead, the IS operator and TRUE operand
    are combined to form a single unary operation called "IS_TRUE". In this
    way, evaluation may be implemented by more efficiently (the TRUE operand
    is eliminated and therefore need not be handled). Conceptually, the above
    expression is equivalent to the following psuedo expression:

    <pre>
        IS_TRUE(count)
    </pre>

    Note that this technique is applied the following operations (also
    combined to be unary operations).

    <ul>
        <li>FQL_IS_NULL</li>
        <li>FQL_IS_NOT_NULL</li>
        <li>FQL_IS_TRUE</li>
        <li>FQL_IS_NOT_TRUE</li>
        <li>FQL_IS_FALSE</li>
        <li>FQL_IS_NOT_FALSE</li>
    </ul>
*/
enum FQLOperation
{
    FQL_UNKNOWN,
    FQL_OR,
    FQL_AND,
    FQL_NOT,
    FQL_EQ,
    FQL_NE,
    FQL_LT,
    FQL_LE,
    FQL_GT,
    FQL_GE,
    FQL_LIKE,
    FQL_NOT_LIKE,
    FQL_ANY,
    FQL_NOT_ANY,
    FQL_EVERY,
    FQL_NOT_EVERY,
    FQL_IS_NULL,
////  FQL_IS_NOT_NULL,
////  FQL_IS_TRUE,
////  FQL_IS_NOT_TRUE,
////  FQL_IS_FALSE,
////  FQL_IS_NOT_FALSE
};

PEGASUS_FQL_LINKAGE const char* FQLOperationToString(FQLOperation x);

PEGASUS_NAMESPACE_END

#endif /* Pegasus_FQLOperation_h */