xref: /aoo4110/main/offapi/com/sun/star/document/XDocumentRecovery.idl (revision b1cdbd2c)

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#ifndef __offapcom_sun_star_document_XDocumentRecovery_idl__
#define __offapcom_sun_star_document_XDocumentRecovery_idl__

#include <com/sun/star/beans/PropertyValue.idl>
#include <com/sun/star/io/IOException.idl>
#include <com/sun/star/lang/WrappedTargetException.idl>

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

module com { module sun { module star { module document {

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

/** is the interface to be implemented by documents who wish to participate in
    the document emergency-save / recovery process.
 */
interface XDocumentRecovery
{
    /** determines whether the document has been modified since the last call to <member>storeToRecoveryFile</member>.

        <p>If <code>storeToRecoveryFile</code> has not been called before, this method returns whether the document
        has been modified since it has been loaded respectively created.</p>

        <p>When saving a session, either in case of a emergency (when OpenOffice.org crashed), or during a
        periodic session save as configured by the user, <member>storeToRecoveryFile</member> is called for every
        document where <code>wasModifiedSinceLastSave</code> returns <TRUE/>.</p>

        <p>It's allowed to implement this method sloppy, by returning <TRUE/> in cases where it is not sure whether
        the document actually has been modified. So, the most simple implementation could simply delegate this call
        to <member scope="com::sun::star::util">XModifiable::isModified</member>. (Well, actually that's the
        second simple implementation, the <em>most</em> simple one would, still egitimately, always return <TRUE/>.)</p>

        <p>However, in such a case, the document might be saved more often than needed. In particular during the
        periodic session save, this might become a problem when saving is expensive, for a single document
        or the sum of all open documents.</p>
    */
    boolean wasModifiedSinceLastSave();

    /** does an emergency save of the document

        <p>A default implementation of this method could simply delegate this call to
        <member scope="com::sun::star::frame">XStorable::storeToURL</member>.</p>

        @param TargetLocation
            specifies the URL of the location to which the document should be emergency-saved.

        @param MediaDescriptor
            contains additional arguments for the save process, for instance an StatusIndicator.

        @see MediaDescriptor
    */
    void    storeToRecoveryFile(
                [in] string TargetLocation,
                [in] sequence< ::com::sun::star::beans::PropertyValue > MediaDescriptor
            )
            raises  (   ::com::sun::star::io::IOException,
                        ::com::sun::star::lang::WrappedTargetException
                    );

    /** recovers the document after a previous emergency or session save.

        <p>The document itself has previously been created, but <em>not</em> loaded
        (via <member scope="com::sun::star::frame">XLoadable::load</member>) or initialized (via
        <member scope="com::sun::star::frame">XLoadable::initNew</member>).</p>

        <p>Upon successful return, the document must be fully initialized. In particular, the
        caller is not responsible for calling <member scope="com::sun::star::frame">XModel::attachResource</member>.
        Instead, the implementation is responsible to do so, if required.</p>

        <p>A default implementation of this method could simply delegate this call to
        <member scope="::com::sun::star::frame:">XLodable::load</member>, followed by
        <member scope="com::sun::star::frame">XModel::attachResource</member>.</p>

        @param SourceLocation
            specifies the URL of the location to which the document was previously emergency-saved.

        @param SalvagedFile
            specifies the original URL of the file which had been emergency-saved. If this is empty,
            then the file should be recovered from its original location.

        @param MediaDescriptor
            contains additional arguments for the load process, for instance an StatusIndicator.

        @see MediaDescriptor
    */
    void    recoverFromFile(
                [in] string SourceLocation,
                [in] string SalvagedFile,
                [in] sequence< ::com::sun::star::beans::PropertyValue > MediaDescriptor
            )
            raises  (   ::com::sun::star::io::IOException,
                        ::com::sun::star::lang::WrappedTargetException
                    );
};

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

}; }; }; };

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

#endif