xref: /aoo41x/main/offapi/com/sun/star/embed/Storage.idl (revision d1766043)

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#ifndef __com_sun_star_embed_Storage_idl__
#define __com_sun_star_embed_Storage_idl__

#ifndef __com_sun_star_embed_BaseStorage_idl__
#include <com/sun/star/embed/BaseStorage.idl>
#endif

#ifndef __com_sun_star_embed_XEncryptionProtectedSource_idl__
#include <com/sun/star/embed/XEncryptionProtectedSource.idl>
#endif

#ifndef __com_sun_star_embed_XTransactedObject_idl__
#include <com/sun/star/embed/XTransactedObject.idl>
#endif

#ifndef __com_sun_star_embed_XTransactionBroadcaster_idl__
#include <com/sun/star/embed/XTransactionBroadcaster.idl>
#endif

#ifndef __com_sun_star_util_XModifiable_idl__
#include <com/sun/star/util/XModifiable.idl>
#endif

#ifndef __com_sun_star_container_XNameAccess_idl__
#include <com/sun/star/container/XNameAccess.idl>
#endif

#ifndef __com_sun_star_lang_XComponent_idl__
#include <com/sun/star/lang/XComponent.idl>
#endif

#ifndef __com_sun_star_beans_XPropertySet_idl__
#include <com/sun/star/beans/XPropertySet.idl>
#endif


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

 module com {  module sun {  module star {  module embed {

//============================================================================
/** This is a service that allows to get access to a package using storage
	hierarchy.

	<p>
	A root storage should be retrieved by using <type>StorageFactory</type>
	service. Substorages are created through <type>XStorage</type> interface
	of a parent storage.
	</p>
 */
published service Storage
{
	// -----------------------------------------------------------------------
	/** This service describes the base functionality of storages.

		<p>
		Please see below the description of additional requirements for the
		package storage implementation.
		</p>

		<dl>
			<dt>interface <type scope="com::sun::star::lang">XComponent</type>
			</dt>
			<dd>
				<p>
				A root storage is created by <type>StorageFactory</type>
				and is controlled by refcounting. In case refcounting
				is decreased to zero the storage will be disposed
				automatically. It is still strongly recommended that
				a root storage is disposed explicitly since in garbage
				collector based languages the refcounting can be
				decreased too late and resources locked by the storage
				will not be freed until then.
				</p>

				<p>
				A substorage is created by <type>XStorage</type>
				interface of storage. Each time a substorage is opened
				it is locked ( in case it is opened in readonly mode
				it is locked for writing, in case it is opened in
				read-write mode it is locked for reading and writing )
				until it is disposed.  The lifetime of substorage is
				also controlled by refcounting but because of mentioned
				garbage collection specific it is strongly recommended
				to dispose substorages explicitly.
				</p>

				<p>
				In case a storage object is disposed all the elements
				( substorages and substreams ) retrieved from the
				object are disposed. If the storage was opened in
				read-write mode all noncommited changes will be lost.
				</p>
			</dd>
			<dt>interface <type>XStorage</type></dt>
			<dd>
				<dl>
					<dt><method>XStorage::openStreamElement</method></dt>
					<dd>
						<p>
						This method returns <type>StorageStream</type>
						service implementation.
						</p>

						<p>
						If the child stream is an encrypted one a corect
						common storage password should be set through
						<type>XEncryptionProtectedSource</type> interface to
						this storage or to a one of storages in parent
						hierarchy. In case the password is not set or is a
						wrong one an exception will be thrown.
						</p>
					</dd>

					<dt><method>XStorage::openEncryptedStreamElement</method></dt>
					<dd>
						This method allows to specify reading password for the
						stream explicitly. The password will be used to read
						the stream. It is possible to specify a new password
						for stream storing through
						<type>XEncryptionProtectedSource</type> interface. In
						case a new password is not specified an old one will
						be used for storing.
					</dd>

					<dt><method>XStorage::openStorageElement</method></dt>
					<dd>
						This method returns <type>Storage</type> service
						implementation.
					</dd>

					<dt><method>XStorage::cloneStreamElement</method></dt>
					<dd>
						<p>
						This method returns <type>StorageStream</type> service
						implementation.
						</p>

						<p>
						The latest flashed version of the stream will be used.
						The stream can be flashed explicitly by
						<method scope="com::sun::star::io">XOutputStream::flush</method>
						call.
						</p>

						<p>
						A storage flashes on commit all the child streams it
						owns. So in case after the stream is changed neither
						the storage was commited nor the stream was flushed
						explicitly, the changes will not appear in the new
						created stream. This method allows to retrieve copy of
						a child stream even in case it is already opened for
						writing.
						</p>

						<p>
						If the child stream is an encrypted one a corect
						common storage password should be set through
						<type>XEncryptionProtectedSource</type> interface to
						this storage or to a one of storages in parent
						hierarchy. In case the password is not set or is a
						wrong one an exception will be thrown.
						</p>
					</dd>

					<dt><method>XStorage::cloneEncryptedStreamElement</method></dt>
					<dd>
						<p>
						This method returns <type>StorageStream</type> service
						implementation.
						</p>

						<p>
						The latest flashed version of the stream will be used.
						The stream can be flashed explicitly by
						<method scope="com::sun::star::io">XOutputStream::flush</method>
						call.
						</p>

						<p>
						A storage flashes on commit all the child streams it
						owns. So in case after the stream is changed neither
						the storage was commited nor the stream was flushed
						explicitly, the changes will not appear in the new
						created stream. This method allows to retrieve copy of
						a child stream even in case it is already opened for
						writing.
						</p>
					</dd>

					<dt><method>XStorage::copyLastCommitTo</method></dt>
					<dd>
						This method gets <type>Storage</type> service
						implementation and fills it in with the latest
						commited version of this storage. So in case the
						storage was not commited after it was changed, the
						changes will not appear in the new created storage.
					</dd>

					<dt><method>XStorage::copyStorageElementLastCommitTo</method></dt>
					<dd>
						<p>
						This method gets <type>Storage</type> service
						implementation and fills it in with the contents of
						the requested substorage. The latest commited version
						of child storage will be used. So in case the child
						storage was not commited after it was changed, the
						changes will not appear in the new created storage.
						</p>

						<p>
						This method allows to retrieve copy of a child storage
						even in case it is already opened for writing.
						</p>
					</dd>

					<dt><method>XStorage::removeStorageElement</method></dt>
					<dd>
						If the element is opened the removing will fail.
					</dd>
				</dl>
			</dd>
			<dt>property URL</dt>
			<dd>
				If the storage is created based on url this property allows
				to retrieve it.
			</dd>
		</dl>

	 */
	service BaseStorage;

	// -----------------------------------------------------------------------
	/** allows to commit or revert changes that were done for the storage.

		<p>
		If a storage is commited all changes made to it will be integrated to
		it's parent storage. This is recursive process, so the last commited
		storage should be the root one. For the package based storages commit
		of a root storage also means flashing to the related medium. If
		a storage is not commited, no changes for it or it's child elements
		will be stored.
		</p>
	 */
	interface ::com::sun::star::embed::XTransactedObject;

	// -----------------------------------------------------------------------
	/** allows to track storage's transaction state.
	 */
	interface ::com::sun::star::embed::XTransactionBroadcaster;

	// -----------------------------------------------------------------------
	/** allows to set password to a root storage.

		<p>
		This interface can be supported by a storage to allow to set
		a common storage password. This password is used as default password
		to decrypt all encrypted streams and to encrypt streams that are
		marked to use common storage password on storing.
		Specifying of the password for a storage allows to use it for the
		whole subtree. Of course substorage can allow to overwrite the common
		storage password for own subtree.
		</p>
	 */
	[optional]
	interface ::com::sun::star::embed::XEncryptionProtectedSource;

	// -----------------------------------------------------------------------
	/** allows to get and set the media type of the storage.
	 */
	[property] string MediaType;

	// -----------------------------------------------------------------------
	/** allows to get and set the version of the format related to the
        MediaType.
	 */
	[property,optional] string Version;

	// -----------------------------------------------------------------------
	/** allows to detect whether mediatype is detected by using fallback
		approach.

		<p>
		Can be set to true if the mediatype can not be detected in standard
		way, but there is a fallback solution allows to do it.
		</p>

		<p>
		Usually means that the document validity is questionable, although
		the package itself is not corrupted. The decision about document
		validity in this case is in application hands. It is up to user of
		the storage to deside whether he accepts the fallback approach for
		an implementation of this service, outputs a warning or an error.
		</p>
	 */
	[property, readonly] boolean MediaTypeFallbackIsUsed;

	// -----------------------------------------------------------------------
	/** allows to detect whether the storage is a root one.
	 */
	[property, readonly] boolean IsRoot;

	// -----------------------------------------------------------------------
	/** allows to detect whether storage is open in "repair package" mode or
		not.
	 */
	[property, optional, readonly] boolean RepairPackage;

	// -----------------------------------------------------------------------
	/** allows to detect if the storage contains encrypted entries.

		<p>
		In case it is set to <TRUE/> the storage itself and/or a tree of
		substorages contain encrypted streams. Usually in case this property
		is supported the implementation supports
		<type>XEncryptionProtectedSource</type> interface.
		</p>
	 */
	[property, optional, readonly] boolean HasEncryptedEntries;

	// -----------------------------------------------------------------------
	/** allows to detect if the storage contains nonencrypted entries.

		<p>
		In case it is set to <TRUE/> the storage itself and/or a tree of
		substorages contains nonencrypted streams. Usually in case this
		property is supported the implementation supports
		<type>XEncryptionProtectedSource</type> interface.
		</p>
	 */
	[property, optional, readonly] boolean HasNonEncryptedEntries;
};

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

}; }; }; };

#endif