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UNO services to access the configuration database

Functional Overview

This code parses the settings that are described in the officecfg directory, and provides a UNO API that code can use to set and get settings.

Source Overview

configurationprovider.cxx configurationregistry.cxx defaultprovider.cxx services.cxx UNO service implementations.

access.cxx childaccess.cxx rootaccess.cxx UNO objects passed to clients.

components.cxx Central singleton that aggregates all data (reads in the XML files, manages modifications and global notifications).

groupnode.cxx localizedpropertynode.cxx localizedvaluenode.cxx node.cxx propertynode.cxx setnode.cxx Internal representations of data nodes.

parsemanager.cxx parser.hxx valueparser.cxx xcdparser.cxx xcsparser.cxx xcuparser.cxx xmldata.cxx XML file reading.

modifications.cxx writemodfile.cxx Modification management.

broadcaster.cxx Notification management.

additions.hxx update.cxx Extension manager interface.

data.cxx lock.cxx nodemap.cxx partial.cxx path.hxx type.cxx Utilities.

Some Implementation Notes

Mandatory Set Members

- A set member can be marked as "mandatory," meaning that a member of that name must always be present in a set.

- The above definition implies that calling replaceByName on a mandatory set member is OK.

- The XCU format can contain oor:mandatory attributes on nodes. (The XCS format does not support them. In the registrymodifications file, oor:mandatory attributes should never be needed, as being mandatory cannot be controlled via the UNO API.) The XCU reading code only evaluates the oor:mandatory attribute for set members, and ignores it everywhere else.

- Only true sets support mandatory members. A localized property for the "*" locale, though acting much like a set, does not support mandatory members.

- The Registry Format document claims that group extension properties are implicitly mandatory, but at least the new configmgr code does not treat them like that (i.e., they can be removed again).

- For simplicity, setMandatory/getMandatory are available as virtual functions at the base Node, even though they can only make sense for GroupNodes and SetNodes that are set members. The default getMandatory implementation returns NO_LAYER, meaning oor:mandatory is not set to true in any layer. (Returning NO_LAYER simplifies the code, e.g., removeByName does not have to check whether getMandatory is called on a member of a true set to decide whether to forbid removal.)

- When committing changes (made through the UNO API), the "mandatory" status of inserted nodes must be updated (in case the insert is due to a replaceByName, or the "mandatory" flag was added by a concurrent modification of a lower layer). Also, for to-be-removed nodes, removal is ignored for (newly; due to concurrent modification of a lower layer) mandatory nodes (but still recorded in registrymodifications, so may take effect once the lower layer addition is removed again---whether or not that is a good idea).

XcuParser Modification Recording

- XcuParser records modifications when reading user layer data (valueParser_.getLayer() == Data::NO_LAYER).

- oor:finalized and oor:mandatory attributes cannot be set via the UNO API, so it is assumed that user layer data does not contain them (for one, they are not written by writeModFile; for another, the logic to record modifications expects a locprop(modify,fuse) to be followed by one or more value(fuse,remove), which would not necessarily be true if the locprop were only present in the user layer data to flag it as finalized).

- The logic to record modifications considers the top of the XML element stack. In the following list of all possible cases, items marked with an asterisk are recorded: ... group(modify,fuse) - group(modify,fuse) - ... ... group(modify,fuse) - set(modify,fuse) - ... ... group(modify,fuse) - *prop(modify,fuse,replace) - value(fuse) ... group(modify,fuse) - *prop(remove) ... group(modify,fuse) - locprop(modify,fuse) - *value(fuse) ... group(modify,fuse) - locprop(modify,fuse) - *value(remove) ... group(modify,fuse) - *locprop(replace) ... ... set(modify,fuse,replace) - group(modify/fuse) - ... ... set(modify,fuse,replace) - *group(replace/fuse) - ... ... set(modify,fuse,replace) - *group(remove) ... set(modify,fuse,replace) - set(modify/fuse) - ... ... set(modify,fuse,replace) - *set(replace/fuse) - ... ... set(modify,fuse,replace) - *set(remove) Legend: "...": zero or more further items "- ...": one or more further items "modify,fuse" etc.: any of those operations "modify/fuse": a modify or a fuse on an existing member "replace/fuse": a replace or a fuse on a non-existing member