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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_FQLParser_h
#define Pegasus_FQLParser_h

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

PEGASUS_NAMESPACE_BEGIN

class PEGASUS_FQL_LINKAGE FQLParser
{
public:

    /** Parse the FQL Query statement given by the text parameter
    and initialize the statement parameter accordingly.

    This method is not thread safe. It must be guarded
    with mutexes by the caller.

    @param text null-terminated C-string which points to FQL
                statement.
    @param statement FQLQueryStatement object which holds the
        compiled version of the SELECT statement upon return.
    @exception ParseError if text is not a valid SELECT statement.
    @exception MissingNullTerminator if text argument is not
        terminated with a null.
    */
    static void parse(
        const char* text,
        FQLQueryStatement& statement);

    /** Version of parse() taking an array of characters.
    */
    static void parse(
        const Buffer& text,
        FQLQueryStatement& statement);

    /** Version of parse() taking a string.
    */
    static void parse(
        const String& text,
        FQLQueryStatement& statement);

private:

    /** This method cleans up all the strings which were created by LEX and
        passed to YACC. These strings cannot be cleaned up by YACC actions
        since the actions that clean up certain strings are not always reached
        when errors occur.
    */
    static void cleanup();

    /** Private constructor to avoid user from creating instance of this class.
    */
    FQLParser() { }
};

PEGASUS_NAMESPACE_END

#endif /* Pegasus_FQLParser_h */