/*************************************************************************
 *
 *  $RCSfile: XMultiLayerStratum.idl,v $
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 *  $Revision: 1.2 $
 *
 *  last change: $Author: rt $ $Date: 2003/04/17 14:18:35 $
 *
 *  The Contents of this file are made available subject to the terms of
 *  either of the following licenses
 *
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 *  Sun Microsystems Inc., October, 2000
 *
 *  GNU Lesser General Public License Version 2.1
 *  =============================================
 *  Copyright 2000 by Sun Microsystems, Inc.
 *  901 San Antonio Road, Palo Alto, CA 94303, USA
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 *  Sun Industry Standards Source License Version 1.1
 *  =================================================
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#ifndef __com_sun_star_configuration_backend_XMultiLayerStratum_idl__
#define __com_sun_star_configuration_backend_XMultiLayerStratum_idl__

#ifndef __com_sun_star_uno_XInterface_idl__
#include <com/sun/star/uno/XInterface.idl>
#endif 

#ifndef __com_sun_star_configuration_backend_XLayer_idl__
#include <com/sun/star/configuration/backend/XLayer.idl>
#endif 

#ifndef __com_sun_star_configuration_backend_XUpdatableLayer_idl__
#include <com/sun/star/configuration/backend/XUpdatableLayer.idl>
#endif

#ifndef __com_sun_star_configuration_backend_BackendAccessException_idl__
#include <com/sun/star/configuration/backend/BackendAccessException.idl>
#endif

#ifndef __com_sun_star_lang_IllegalArgumentException_idl__
#include <com/sun/star/lang/IllegalArgumentException.idl>
#endif 

#ifndef __com_sun_star_lang_NoSupportException_idl__
#include <com/sun/star/lang/NoSupportException.idl>
#endif 

//============================================================================= 

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 #107954#
*/
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 <type>Layer</type> objects.
                <p> The list ist 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 
         <member>XMultiLayerStratum::listLayerIds()</member> 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 <type>UpdatableLayer</type> 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 
                <member>XMultiLayerStratum::listLayerIds()</member> or  
                <member>XMultiLayerStratum::getUpdateLayerId()</member>. 
                </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 
                    <member scope="com::sun::star::util">XTimeStamped::getTimestamp()</member>.
                </p>

      @returns   
                a <type>Layer</type> 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 
                <member>XMultiLayerStratum::listLayerIds()</member>. 
                </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 
                    <member scope="com::sun::star::util">XTimeStamped::getTimestamp()</member>.
                </p>

      @returns   
                a list of <type>Layer</type> 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 
                <member>XMultiLayerStratum::listLayerIds()</member>. 
                </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 
                    <member scope="com::sun::star::util">XTimeStamped::getTimestamp()</member>.
                </p>

      @returns   
                a list of <type>Layer</type> 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 
                <member>XMultiLayerStratum::getUpdateLayerId()</member>. 
                </p>

      @return   
                an <type>UpdatableLayer</type> 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) ;
    
	//------------------------------------------------------------------------- 
} ;

//============================================================================= 

} ; } ; } ; } ; } ;

#endif 
