LibreOffice
LibreOffice 6.2 SDK API Reference
Exported Interfaces | List of all members
FilterFactory Service Referencepublished

factory to create filter components. More...

import"FilterFactory.idl";

Inheritance diagram for FilterFactory:
XMultiServiceFactory XNameAccess XNameContainer XContainerQuery XFlushable XInterface XElementAccess XNameReplace XInterface XInterface XInterface XNameAccess XElementAccess XInterface

Exported Interfaces

interface com::sun::star::lang::XMultiServiceFactory
 factory interface to create and initialize filter components. More...
 
interface com::sun::star::container::XNameAccess
 provides read access to the complete set of configuration data. More...
 
interface com::sun::star::container::XNameContainer
 provides a write access to the configuration data. More...
 
interface com::sun::star::container::XContainerQuery
 provides search on the configuration data set. More...
 
interface com::sun::star::util::XFlushable
 can be used to perform container changes. More...
 

Additional Inherited Members

- Public Member Functions inherited from XMultiServiceFactory
com::sun::star::uno::XInterface createInstance ([in] string aServiceSpecifier) raises ( com::sun::star::uno::Exception )
 Creates an instance classified by the specified name. More...
 
com::sun::star::uno::XInterface createInstanceWithArguments ([in] string ServiceSpecifier, [in] sequence< any > Arguments) raises ( com::sun::star::uno::Exception )
 Creates an instance classified by the specified name and passes the arguments to that instance. More...
 
sequence< string > getAvailableServiceNames ()
 Provides the available names of the factory to be used to create instances. More...
 
- Public Member Functions inherited from XInterface
any queryInterface ([in] type aType)
 queries for a new interface to an existing UNO object. More...
 
void acquire ()
 increases the reference counter by one. More...
 
void release ()
 decreases the reference counter by one. More...
 
- Public Member Functions inherited from XNameAccess
any getByName ([in] string aName) raises ( com::sun::star::container::NoSuchElementException, com::sun::star::lang::WrappedTargetException )
 
sequence< string > getElementNames ()
 
boolean hasByName ([in] string aName)
 
- Public Member Functions inherited from XElementAccess
type getElementType ()
 
boolean hasElements ()
 
- Public Member Functions inherited from XContainerQuery
XEnumeration createSubSetEnumerationByQuery ([in] string Query)
 creates a sub set of container items which match given query command More...
 
XEnumeration createSubSetEnumerationByProperties ([in] sequence< com::sun::star::beans::NamedValue > Properties)
 creates a sub set of container items which supports searched properties as minimum More...
 
- Protected Member Functions inherited from XNameContainer
void insertByName ([in] string aName, [in] any aElement) raises ( com::sun::star::lang::IllegalArgumentException, com::sun::star::container::ElementExistException, com::sun::star::lang::WrappedTargetException )
 inserts the given element at the specified name. More...
 
void removeByName ([in] string Name) raises ( com::sun::star::container::NoSuchElementException, com::sun::star::lang::WrappedTargetException )
 removes the element with the specified name. More...
 
- Protected Member Functions inherited from XNameReplace
void replaceByName ([in] string aName, [in] any aElement) raises ( com::sun::star::lang::IllegalArgumentException, com::sun::star::container::NoSuchElementException, com::sun::star::lang::WrappedTargetException )
 replaces the element with the specified name with the given element. More...
 
- Protected Member Functions inherited from XContainerQuery
XEnumeration createSubSetEnumerationByQuery ([in] string Query)
 creates a sub set of container items which match given query command More...
 
XEnumeration createSubSetEnumerationByProperties ([in] sequence< com::sun::star::beans::NamedValue > Properties)
 creates a sub set of container items which supports searched properties as minimum More...
 
- Protected Member Functions inherited from XFlushable
void flush ()
 flushes the data of the object to the connected data source. More...
 
void addFlushListener ([in] com::sun::star::util::XFlushListener l)
 adds the specified listener to receive event "flushed." More...
 
void removeFlushListener ([in] com::sun::star::util::XFlushListener l)
 removes the specified listener. More...
 

Detailed Description

factory to create filter components.

After a generic TypeDetection an internal type name will be known. Further a generic com::sun::star::frame::FrameLoader can use this information, to search a suitable filter (may the default filter) at this factory and use it for loading the document into a specified frame.

This factory implements read/write access on the underlying configuration set. and further a validate and flush mechanism for more performance and a special query mode can be used here too.

Developers Guide
OfficeDev - Integrating Import and Export Filters

Exported Interfaces

provides search on the configuration data set.

Against simple property search it provides some complex algorithms too. For further information please read the SDK documentation.

provides read access to the complete set of configuration data.

Every container item is specified as a set of properties and will be represented by a sequence< com::sun::star::beans::PropertyValue > structure. Follow properties are supported: (But note: not all of them must be present every time!)

Property Name Value Type Description
Name [string] The internal name is the only value, which makes a container item unique.
UIName [string] It contains the localized name for this filter for the current locale.
UINames [sequence< string >] It contains all available localized names for this filter. The are organized in pairs and represented as a structure of sequence< com::sun::star::beans::PropertyValue >. The name of such property must be interpreted as locale; its value as the localized filter name corresponding to this locale.
Type [string] Every filter is registered for a type. This value contains the internal name of it. (see service TypeDetection for further information)
DocumentService [string] It's the UNO service name of the document type, which can be handled by this filter. (e.g. com::sun::star::text::TextDocument)
FilterService [string] It means the UNO implementation name of the filter component. Note: It really means the implementation instead of the UNO service name. Because it's not possible to distinguish between more than one filters; if all of them uses a generic identifier!
Flags [integer] They describe the filter more specific.
(e.g. they mark it as IMPORT/EXPORT or DEFAULT filter.)
UserData [string] This field contains filter specific configuration data.
FileFormatVersion [integer] It specifies the supported file format version if there exist more than ones.
TemplateName [string] It's the name of a suitable default template.

Note:
All elements of this container will be addressed by his internal name, and it must be an unambiguous value.

provides a write access to the configuration data.

factory interface to create and initialize filter components.

Current behavior

The methods createInstance() or createInstanceWithArguments() of this interface must be called with an internal type name!. This name is used internally to search a suitable (mostly the default) filter for this type then. The found filter will be created, initialized and returned then. Creation of a filter by using its internal filter name directly can be reached by using createInstanceWithArguments() with an optional property "FilterName" only. See the following example:

private com.sun.star.uno.XInterface createFilterDirect( com.sun.star.lang.XMultiServiceFactory xFilterFactory ,
java.lang.String sInternalFilterName )
{
aFilterProp.Name = "FilterName";
aFilterProp.Value = sInternalFilterName;
com.sun.star.uno.Any[] lProps = new com.sun.star.uno.Any[1];
lProps[0] = aFilterProp;
java.lang.Object aFilter = xFilterFactory.createInstanceWithArguments("", lProps);
return (com.sun.star.uno.XInterface)UnoRuntime.queryInterface(com.sun.star.uno.XInterface.class, aFilter);
}

Proposed behavior

Searching of a suitable filter for a given internal type name, must be done by the new interface com::sun::star::container::XContainerQuery, available on this factory too. The factory interface can be used to create filter components by its internal filter name only.

How it can be distinguished?

The new proposed implementation will throw an com::sun::star::container::NoSuchElementException if the first parameter of createInstance() or createInstanceWithArguments() does not match to a valid container (means filter) item. Further it will throw an com::sun::star::lang::IllegalArgumentException if the optional parameter "FilterName" could not be detected inside the argument list of call createInstanceWithArguments().

Initialization of a filter component

Every filter, which was created by this factory can(!) be initialized with its own configuration data and may given optional arguments of the corresponding createInstanceWithArguments() request. To do so the filter instance must support the optional interface com::sun::star::lang::XInitialization. The arguments parameter will have the following structure:

  • sequence< Any >[0] contains a sequence< com::sun::star::beans::PropertyValue >, which represent the configuration data set of this filter. The used properties are the same, as they are available at the container interface of this factory service. (see below)
  • Every following item of the argument list sequence< Any >[1..n] contains the copied argument of the corresponding createInstanceWithArguments() call. That means: Item 0 or the original list was copied as item 1 of the destination list ... etc.

can be used to perform container changes.

Because the complexness of such configuration set can be very high, it seems not very useful to update the underlying configuration layer on every container change request immediately. Another strategy can be to make all changes (adding/changing/removing of items) and call flush at the end. That will validate the whole container and reject inconsistent data sets. Only in case all made changes was correct, they will be written back to the configuration. Further this interface provides the possibility, that interested changes listener can be registered too.


The documentation for this service was generated from the following file: