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#ifndef Pegasus_CIMInstanceProvider_h
#define Pegasus_CIMInstanceProvider_h

#include <Pegasus/Common/Config.h>
#include <Pegasus/Provider/CIMProvider.h>

#include <Pegasus/Common/Array.h>
#include <Pegasus/Common/CIMPropertyList.h>
#include <Pegasus/Common/CIMObjectPath.h>
#include <Pegasus/Common/CIMInstance.h>
#include <Pegasus/Provider/Linkage.h>

PEGASUS_NAMESPACE_BEGIN
/** This class defines a set of functions that support the
manipulation of instances of a CIM object class and their
properties.

<p>The Instance Provider is the most common provider, and
is the provider interface used by the CIM Server to perform instance
and property
manipulation requests from CIM clients. Instance providers
may be implemented for any CIM class, including <i>Association</i>
classes.</p>

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

<p><ul>
<li>{@link getInstance getInstance}</li>
<li>{@link enumerateInstances enumerateInstances}</li>
<li>{@link enumerateInstanceNames enumerateInstanceNames}</li>
<li>{@link modifyInstance modifyInstance}</li>
<li>{@link createInstance createInstance}</li>
<li>{@link deleteInstance deleteInstance}</li>
</ul></p>

<p>The Instance 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 CIMInstanceProvider : public virtual CIMProvider
{
public:
    /**
        Constructor.
        The constructor should not do anything.
    */
    CIMInstanceProvider();

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

    /**
        \Label{getInstance}
        Return a single instance.

        <p><tt>getInstance</tt> is called with an
        {@link CIMObjectPath instanceReference} specifying a CIM
        instance to be returned. The provider should determine whether
        the specification corresponds to a valid instance. If so, it will
        construct a <tt>{@link CIMInstance CIMInstance}</tt>
        and deliver this to the CIM Server via the
        <tt>{@link ResponseHandler ResponseHandler}</tt>
        callback. If the specified instance does not exist, this
        function should throw an
        <tt>{@link CIMObjectNotFoundException CIMObjectNotFoundException}.</tt>
        </p>

        <p>A provider can be implemented and registered to perform
        operations for
        several levels of the same line of descent (e.g.,
        CIM_ComputerSystem and CIM_UnitaryComputerSystem). When this
        is done, care must be taken to return the same set of key
        values regardless of which class was specified in the
        operation.</p>

        @param context specifies the client user's context for this operation,
        including the User ID.

        @param instanceReference specifies the fully qualified object path
        of the instance of interest.

        @param includeQualifiers indicates whether the returned instance must
        include the qualifiers for the instance and properties.  Qualifiers may
        be included even if this flag is false.

        @param includeClassOrigin indicates whether the returned instance must
        include the class origin for each of the instance elements.

        @param propertyList if not null, this parameter
        specifies the minimum set of properties required in instances
        returned by this operation. Because
        support for this parameter is optional, the instances may contain
        additional properties not specified in the list.
        NOTE: The provider does NOT receive the client filtering parameter
        localOnly.  This is resolved in the CIMOM into the propertyList so
        that the property list represents the complete set of properties to
        be returned.
        If the propertyList is NULL all properties are returned.  If it is
        nonNULL but empty, no properites are to be returned.

        @param handler a {@link ResponseHandler ResponseHandler} object used
        to deliver results to the CIM Server.

        @exception CIMNotSupportedException
        @exception CIMInvalidParameterException
        @exception CIMObjectNotFoundException
        @exception CIMAccessDeniedException
        @exception CIMOperationFailedException
    */
    virtual void getInstance(
        const OperationContext& context,
        const CIMObjectPath& instanceReference,
        const Boolean includeQualifiers,
        const Boolean includeClassOrigin,
        const CIMPropertyList& propertyList,
        InstanceResponseHandler& handler) = 0;

    /**
        \Label{enumerateInstances}
        Return all instances of the specified class.

        <p>A typical implementation of this function will call the
        <tt>{@link processing processing}</tt> function in the
        <tt>{@link ResponseHandler handler}</tt> object, then
        iterate over the system resources representing instances of
        the CIM object, calling <tt>{@link deliver deliver}</tt> on
        each iteration. It must call <tt>deliver</tt> with an
        argument of type <tt>{@link CIMInstance CIMInstance}</tt>.
        Finally, it will call <tt>{@link complete complete}</tt> to
        inform the CIM Server that it has delivered all known instances.</p>

        <p>A provider can be implemented and registered to perform
        operations for several levels of the same line of descent (e.g.,
        CIM_ComputerSystem and CIM_UnitaryComputerSystem). When this
        is done, the provider must return instances <i>only</i>
        for the deepest class for which it is registered, since
        the CIM Server will invoke <tt>enumerateInstances</tt> for all
        classes at and beneath that specified in the
        {@link CIMObjectPath classReference}.</p>

        @param context specifies the client user's context for this operation,
        including the User ID.

        @param classReference specifies the fully qualified object path
        to the class of interest.

        @param includeQualifiers indicates whether the returned instances must
        include the qualifiers for the instance and properties.  Qualifiers may
        be included even if this flag is false.

        @param includeClassOrigin indicates whether the returned instances must
        include the class origin for each of the instance elements.

        @param propertyList If not null, this parameter specifies the minimum
        set of properties required in instances returned by this operation.
        Because support for this parameter is optional, the instances may
        contain additional properties not specified in the list. NOTE: The
        provider does NOT receive the client filtering parameters localOnly
        or deepInheritance.  These are resolved in the CIM Server into the
        propertyList.

        @param handler {@link ResponseHandler ResponseHandler} object for
        delivery of results.

        @exception CIMNotSupportedException
        @exception CIMInvalidParameterException
        @exception CIMObjectNotFoundException
        <br>should never be thrown by this function; if
        there are no instances to return, this function should deliver an empty
        set of instances by calling the
        handler's <tt>{@link processing processing} </tt> and
        <tt>{@link complete complete}</tt> functions without calling
        <tt>{@link deliver deliver}</tt>.

        @exception CIMAccessDeniedException
        @exception CIMOperationFailedException
    */
    virtual void enumerateInstances(
        const OperationContext& context,
        const CIMObjectPath& classReference,
        const Boolean includeQualifiers,
        const Boolean includeClassOrigin,
        const CIMPropertyList& propertyList,
        InstanceResponseHandler& handler) = 0;

    /**
        \Label{enumerateInstanceNames}
        Return all instance names of a single class.

        <p>Like <tt>enumerateInstances</tt>, a typical implementation
        of <tt>enumerateInstanceNames</tt> will call the
        <tt>{@link processing processing}</tt> function in the
        <tt>{@link ResponseHandler handler}</tt> object, then
        iterate over the system resources representing instances of
        the CIM object, calling <tt>{@link deliver deliver}</tt> on
        each iteration. It must call {@link deliver deliver} with an
        argument of type <tt>{@link CIMObjectPath CIMObjectPath}</tt>
        containing the information that uniquely identifies each
        instance.
        Finally, it will call <tt>{@link complete complete}</tt> to
        inform the CIM Server that it has delivered all known instances.</p>

        <p>A provider can be implemented and registered to perform
        operations for several levels of the same line of descent (e.g.,
        CIM_ComputerSystem and CIM_UnitaryComputerSystem). When this
        is done, the provider must return instance names <i>only</i>
        for the deepest class for which it is registered, since
        the CIM Server will invoke <tt>enumerateInstanceNames</tt> for all
        classes at and beneath that specified in the
        {@link CIMObjectPath classReference}.</p>

        @param context specifies the client user's context for this operation,
        including the User ID.

        @param classReference specifies the fully qualified object path to
        the class of interest.

        @param handler {@link ResponseHandler ResponseHandler} object for
        delivery of results.

        @exception CIMNotSupportedException
        @exception CIMInvalidParameterException
        @exception CIMObjectNotFoundException
        @exception CIMAccessDeniedException
        @exception CIMOperationFailedException
    */
    virtual void enumerateInstanceNames(
        const OperationContext& context,
        const CIMObjectPath& classReference,
        ObjectPathResponseHandler& handler) = 0;

    /**
        \Label{modifyInstance}
        Replace the current instance specified in the
        instanceReference parameter.

        <p><tt>modifyInstance</tt> sets the values of properties of
        the instance specified by the <tt>instanceReference</tt> parameter
        to those specified in the <tt>instanceObject</tt> parameter, as
        controlled by the <tt>propertyList</tt> parameter. If the
        <tt>propertyList</tt>
        is NULL, then the operation sets all properties. Otherwise,
        it sets only those specified in the <tt>propertyList</tt>.
        Properties specified in the <tt>propertyList</tt> but not present in
        the <tt>instanceObject</tt> are replaced by
        the class default values or left null.</p>

        <p>Ideally, <tt>modifyInstance</tt> is intended to be
        an <i>atomic</i> operation on values of the instance. That is,
        concurrent accesses to the instance by other threads should be
        blocked during the operation, so that all of the affected property
        values can be
        changed without intervening accesses by concurrent requests.
        Otherwise, other requests could obtain intermediate, and
        possibly inconsistent, results.</p>

        <p>If the specified instance does not exist, the provider
        should throw an {@link CIMObjectNotFoundException ObjectNotFound}
        exception.

        @param context specifies the client user's context for this operation,
        including the User ID.

        @param instanceReference specifies the fully qualified object path
        of the instance of interest.

        @param instanceObject contains the partial or complete set of
        properties whose values should be changed.

        @param includeQualifiers indicates whether the instance qualifiers must
        be updated as specified in the modified instance.  If false, no
        qualifiers are explicitly modified by this operation.

        @param propertyList If not null, this parameter specifies the set
        of properties required to be updated in the instance. Support for
        this parameter is NOT optional.  Providers that do not support this
        feature must throw a
        {@link CIMNotSupportedException CIMNotSupportedException} exception.
        NOTE: The provider does NOT receive the client filtering parameters
        localOnly or deepInheritance.  These are resolved in the CIMOM into
        the propertyList.

        @param handler {@link ResponseHandler ResponseHandler} object for
        delivery of results.

        @exception CIMNotSupportedException
        @exception CIMInvalidParameterException
        @exception CIMObjectNotFoundException
        @exception CIMAccessDeniedException
        @exception CIMOperationFailedException
    */
    virtual void modifyInstance(
        const OperationContext& context,
        const CIMObjectPath& instanceReference,
        const CIMInstance& instanceObject,
        const Boolean includeQualifiers,
        const CIMPropertyList& propertyList,
        ResponseHandler& handler) = 0;

    /**
        \Label{createInstance}
        Create a new instance.

        <p>Create a new instance of the specified class as specified
        by the <tt>instanceReference</tt> and <tt>instanceObject</tt>
        parameters.</p>

        @param context specifies the client user's context for this operation,
        including the User ID.

        @param instanceReference Specifies the namespace and class name
        of the instance to create.  The key bindings are not present in
        the instanceReference, because an instance name is not defined
        until after the instance has been created.

        @param instanceObject contains the partial or complete instance to
        create.  If a key property is null, the provider <em>must</em> supply
        a valid value for the property or throw a
        {@link CIMInvalidParameterException CIMInvalidParameterException}.
        If any property value is invalid, the provider should throw a
        {@link CIMInvalidParameterException CIMInvalidParameterException}.

        @param handler {@link ResponseHandler ResponseHandler} object for
        delivery of results.  If the operation is successful, the provider must
        deliver the complete instance name of the created instance.

        @exception CIMNotSupportedException
        @exception CIMInvalidParameterException
        @exception CIMObjectAlreadyExistsException
        @exception CIMAccessDeniedException
        @exception CIMOperationFailedException
    */
    virtual void createInstance(
        const OperationContext& context,
        const CIMObjectPath& instanceReference,
        const CIMInstance& instanceObject,
        ObjectPathResponseHandler& handler) = 0;

    /**
        \Label{deleteInstance}
        Delete the instance specified by the instanceReference parameter.

        @param context specifies the client user's context for this operation,
        including the User ID.

        @param instanceReference specifies the fully qualified object
        path of the instance to delete. If the specified object does
        not exist, the provider should throw an
        {@link CIMObjectNotFoundException ObjectNotFound} exception.

        @param handler {@link ResponseHandler ResponseHandler} object for
        delivery of results.

        @exception CIMNotSupportedException
        @exception CIMInvalidParameterException
        @exception CIMObjectNotFoundException
        @exception CIMAccessDeniedException
        @exception CIMOperationFailedException
    */
    virtual void deleteInstance(
        const OperationContext& context,
        const CIMObjectPath& instanceReference,
        ResponseHandler& handler) = 0;
};

PEGASUS_NAMESPACE_END

#endif