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module com { module sun { module star { module configuration { module backend {


/**
  Handles access to a stratum consisting of multiple layers
  in a single configuration data repository

  <p> The interface provides access to data for multiple entities and
     timestamp-checking capabilities for efficient caching.
  </p>

  @see com::sun::star::configuration::backend::XBackendEntities
  @see com::sun::star::util::XTimeStamped
  @see com::sun::star::configuration::backend::XSchemaSupplier
  @see com::sun::star::configuration::backend::XSingleLayerStratum

  @since OOo 1.1.2
*/
published interface XMultiLayerStratum : ::com::sun::star::uno::XInterface
{

    /**
      identifies the layers within this stratum which should be read and
      merged to determine data of a component for an entity


      @param aComponent
                The name of the component to access.

      @param aEntity
                The name of an entity on behalf of which data will be accessed.

      @return
                a list of layer identifiers that can be used to
                retrieve Layer objects.
                <p> The list is ordered by priority. Typically
                   the most general layers (global defaults,
                   entire organization) are first, more specific layers
                   (associated to specific groups or roles) are next
                   and the entity's own data is last.
                </p>

      @throws   com::sun::star::lang::IllegalArgumentException
                if the component identifier is invalid or
                if the entity doesn't exist.

      @throws   com::sun::star::configuration::backend::BackendAccessException
                if an error occurs while accessing the data.

      @see com::sun::star::configuration::backend::XMultiLayerStratum::getLayer()
      @see com::sun::star::configuration::backend::XMultiLayerStratum::getLayers()
      @see com::sun::star::configuration::backend::XMultiLayerStratum::getMultipleLayers()
      @see com::sun::star::configuration::backend::XBackendEntities
    */
    sequence<string> listLayerIds([in] string aComponent,
                                  [in] string aEntity)
        raises (BackendAccessException,
                com::sun::star::lang::IllegalArgumentException) ;


    /**
      identifies the layer which should be modified
      to update data of a component on behalf of an entity.

      <p> The layer id returned is one of the layer ids obtained from
         XMultiLayerStratum::listLayerIds() for the same
         component and entity.
      </p>

      @param aComponent
                The name of the component to access.

      @param aEntity
                The name of an entity on behalf of which data will be accessed.

      @returns
                a layer identifier that can be used to obtain
                an UpdatableLayer object.

      @throws   com::sun::star::lang::IllegalArgumentException
                if the component identifier is invalid or
                if the entity doesn't exist.

      @throws   com::sun::star::lang::NoSupportException
                if the implementation does not support updates.

      @throws   com::sun::star::configuration::backend::BackendAccessException
                if an error occurs while accessing the data.

      @see com::sun::star::configuration::backend::XMultiLayerStratum::getUpdatableLayer()
      @see com::sun::star::configuration::backend::XBackendEntities
    */
    string getUpdateLayerId([in] string aComponent,
                            [in] string aEntity)
        raises (BackendAccessException,
                com::sun::star::lang::NoSupportException,
                com::sun::star::lang::IllegalArgumentException) ;


    /**
      retrieves a layer associated to a layer id, if newer than indicated.

      <p> A timestamp can be provided, which is used to indicate
         a point in time. The layer should be returned only if is modified
         since that time.
      </p>

      @param aLayerId
                identifier of the layers to be accessed.
                <p>Layer ids can be obtained from
                XMultiLayerStratum::listLayerIds() or
                XMultiLayerStratum::getUpdateLayerId().
                </p>

      @param aTimestamp
                a timestamp for the layer.

                <p> An empty timestamp indicates, that the layer should be
                   retrieved irrespective of its modification time.
                </p>
                <p> The format and meaning of a timestamp depends on
                    the implementation. Timestamps can be obtained using
                    com::sun::star::util::XTimeStamped::getTimestamp().
                </p>

      @returns
                a Layer object providing access to the layer data,
                `NULL` if the layer is newer than indicated by the timestamp.

      @throws   com::sun::star::lang::IllegalArgumentException
                if the layer id is invalid or
                if the timestamp is invalid

      @throws   com::sun::star::configuration::backend::BackendAccessException
                if an error occurs while accessing the data.

      @see com::sun::star::util::XTimeStamped
    */
    XLayer getLayer([in] string aLayerId,
                    [in] string aTimestamp)
        raises (BackendAccessException,
                com::sun::star::lang::IllegalArgumentException) ;


    /**
      retrieves the layers associated to a series of layer ids,
      if newer than indicated.
      <p> A timestamp can be provided, which is used to indicate
         a point in time. Only layers that are modified since that time
         should be returned. The same timestamp is used for all layers.
      </p>

      @param aLayerIds
                identifiers of the layers to be accessed.
                <p>Layer ids can be obtained from
                XMultiLayerStratum::listLayerIds().
                </p>

      @param aTimestamp
                a timestamp for all of the layers.
                <p> An empty timestamp indicates, that the layers should be
                   retrieved irrespective of their modification time.
                </p>
                <p> The format and meaning of a timestamp depends on
                    the implementation. Timestamps can be obtained using
                    com::sun::star::util::XTimeStamped::getTimestamp().
                </p>

      @returns
                a list of Layer objects
                providing access to the layer data.
                <p> The list has the same length as aLayerIds. Each layer
                   object is associated to the layer id in the corresponding
                   position.
                </p>
                <p> For layers that are newer than indicated by the
                   timestamp, the list contains a `NULL` element.
                </p>

      @throws   com::sun::star::lang::IllegalArgumentException
                if one of the layer ids is invalid or
                if the timestamp is invalid

      @throws   com::sun::star::configuration::backend::BackendAccessException
                if an error occurs while accessing the data.

      @see com::sun::star::util::XTimeStamped
    */
    sequence<XLayer> getLayers([in] sequence<string> aLayerIds,
                               [in] string aTimestamp)
        raises (BackendAccessException,
                com::sun::star::lang::IllegalArgumentException) ;


    /**
      retrieves the layers associated to a series of layer ids,
      if newer than indicated for each layer.
      <p> For each layer an individual timestamp can be provided,
         which is used to indicate the last known version of the layer.
         Only layers that are modified since that time should be returned.
      </p>

      @param aLayerIds
                identifiers of the layers to be accessed.
                <p>Layer ids can be obtained from
                XMultiLayerStratum::listLayerIds().
                </p>

      @param aTimestamps
                timestamps for each of the layers.

                <p> This list must have the same length as aLayerIds.
                    Timestamps are matched to layer ids by their position.
                </p>
                <p> An empty timestamp indicates, that the associated layer
                   should be retrieved irrespective of its modification time.
                </p>
                <p> The format and meaning of a timestamp depends on
                    the implementation. Timestamps can be obtained using
                    com::sun::star::util::XTimeStamped::getTimestamp().
                </p>

      @returns
                a list of Layer objects
                providing access to the layer data.
                <p> The list has the same length as aLayerIds. Each layer
                   object is associated to the layer id in the corresponding
                   position.
                </p>
                <p> For layers that are newer than indicated by the corresponding
                   timestamp, the list contains a `NULL` element.
                </p>

      @throws   com::sun::star::lang::IllegalArgumentException
                if one of the layer ids is invalid or
                if one of the timestamps is invalid or
                if the lengths of the arguments don't match.

      @throws   com::sun::star::configuration::backend::BackendAccessException
                if an error occurs while accessing the data.

      @see com::sun::star::util::XTimeStamped
      */
    sequence<XLayer> getMultipleLayers([in] sequence<string> aLayerIds,
                                       [in] sequence<string> aTimestamps)
        raises (BackendAccessException,
                com::sun::star::lang::IllegalArgumentException) ;


    /**
      retrieves a writable representation of the layer
      associated to a layer id.

      @param aLayerId
                identifier of the layer to be accessed for writing.
                <p>A layer id for writing can be obtained from
                XMultiLayerStratum::getUpdateLayerId().
                </p>

      @return
                an UpdatableLayer object providing
                write access to the layer

      @throws   com::sun::star::lang::IllegalArgumentException
                if the layer id is invalid.

      @throws   com::sun::star::lang::NoSupportException
                if the implementation does not support updates.

      @throws   com::sun::star::configuration::backend::BackendAccessException
                if an error occurs while accessing the data.
     */
    XUpdatableLayer getUpdatableLayer([in] string aLayerId)
        raises (BackendAccessException,
                com::sun::star::lang::NoSupportException,
                com::sun::star::lang::IllegalArgumentException) ;

} ;


} ; } ; } ; } ; } ;

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