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#ifndef Pegasus_CIMInstanceQueryProvider_h
#define Pegasus_CIMInstanceQueryProvider_h

#include "CIMInstanceProvider.h"
#include <Pegasus/Query/QueryExpression/QueryExpression.h>

PEGASUS_NAMESPACE_BEGIN

/**
    This class extends then CIMInstanceProvider class enabling query support.

    <p>In addition to
    functions inherited from the
    {@link CIMInstanceProvider CIMInstanceProvider} interface,
    the functions in the Instance Query Provider interface are:</p>

    <p><ul>
    <li>{@link execQuery execQuery}</li>
    </ul></p>

    <p>The Instance Query Provider receives operation requests from
    clients through calls to these functions by the CIM Server. Its
    purpose is to convert these to calls to system services,
    operations on system resources, or whatever platform-specific
    behavior is required to perform the operation modeled by
    the request. The specific requirements for each of the interface
    functions are discussed in their respective sections.</p>
*/

class PEGASUS_PROVIDER_LINKAGE CIMInstanceQueryProvider :
    public CIMInstanceProvider
{
public:
    /**
        Constructor.
        The constructor should not do anything.
    */
    CIMInstanceQueryProvider();

    /**
        Destructor.
        The destructor should not do anything.
    */
    virtual ~CIMInstanceQueryProvider();

    /**
        \Label{execQuery}
        Return all instances of the specified class filtered by the query.

        @param context contains security and locale information relevant
        for the lifetime of this operation.
        @param objectPath contains namespace and classname for which the
        query is to be performed.
        @param query enables access to query details like query statement
        and language.
        @param handler asynchronusly processes the results of this operation.

        @exception CIMNotSupportedException
        @exception CIMAccessDeniedException
        @exception CIMOperationFailedException
    */
    virtual void execQuery(
       const OperationContext& context,
       const CIMObjectPath& objectPath,
       const QueryExpression& query,
       InstanceResponseHandler& handler) = 0;
};

PEGASUS_NAMESPACE_END

#endif