1 UNO services to access the configuration database
3 == Functional Overview ==
5 This code parses the settings that are described in the [[officecfg]]
6 directory, and provides an UNO API that code can use to set and get
11 configurationprovider.cxx
12 configurationregistry.cxx
15 UNO service implementations.
20 UNO objects passed to clients.
23 Central singleton that aggregates all data (reads in the XML files, manages
24 modifications and global notifications).
27 localizedpropertynode.cxx
28 localizedvaluenode.cxx
32 Internal representations of data nodes.
45 Modification management.
48 Notification management.
52 Extension manager interface.
63 == Some Implementation Notes ==
65 === Mandatory Set Members ===
67 - A set member can be marked as "mandatory," meaning that a member of that name
68 must always be present in a set.
70 - The above definition implies that calling replaceByName on a mandatory set
73 - The XCU format can contain oor:mandatory attributes on nodes. (The XCS format
74 does not support them. In the registrymodifications file, oor:mandatory
75 attributes should never be needed, as being mandatory cannot be controlled via
76 the UNO API.) The XCU reading code only evaluates the oor:mandatory attribute
77 for set members, and ignores it everywhere else.
79 - Only true sets support mandatory members. A localized property for the "*"
80 locale, though acting much like a set, does not support mandatory members.
82 - The OpenOffice.org Registry Format document claims that group extension
83 properties are implicitly mandatory, but at least the new configmgr code does
84 not treat them like that (i.e., they can be removed again).
86 - For simplicity, setMandatory/getMandatory are available as virtual functions
87 at the base Node, even though they can only make sense for GroupNodes and
88 SetNodes that are set members. The default getMandatory implementation returns
89 NO_LAYER, meaning oor:mandatory is not set to true in any layer. (Returning
90 NO_LAYER simplifies the code, e.g., removeByName does not have to check whether
91 getMandatory is called on a member of a true set to decide whether to forbid
94 - When committing changes (made through the UNO API), the "mandatory" status of
95 inserted nodes must be updated (in case the insert is due to a replaceByName, or
96 the "mandatory" flag was added by a concurrent modification of a lower layer).
97 Also, for to-be-removed nodes, removal is ignored for (newly; due to concurrent
98 modification of a lower layer) mandatory nodes (but still recorded in
99 registrymodifications, so may take effect once the lower layer addition is
100 removed again---whether or not that is a good idea).
103 === XcuParser Modification Recording ===
105 - XcuParser records modifications when reading user layer data
106 (valueParser_.getLayer() == Data::NO_LAYER).
108 - oor:finalized and oor:mandatory attributes cannot be set via the UNO API, so
109 it is assumed that user layer data does not contain them (for one, they are not
110 written by writeModFile; for another, the logic to record modifications expects
111 a locprop(modify,fuse) to be followed by one or more value(fuse,remove), which
112 would not necessarily be true if the locprop were only present in the user layer
113 data to flag it as finalized).
115 - The logic to record modifications considers the top of the XML element stack.
116 In the following list of all possible cases, items marked with an asterisk are
118 ... group(modify,fuse) - group(modify,fuse) - ...
119 ... group(modify,fuse) - set(modify,fuse) - ...
120 ... group(modify,fuse) - *prop(modify,fuse,replace) - value(fuse)
121 ... group(modify,fuse) - *prop(remove)
122 ... group(modify,fuse) - locprop(modify,fuse) - *value(fuse)
123 ... group(modify,fuse) - locprop(modify,fuse) - *value(remove)
124 ... group(modify,fuse) - *locprop(replace) ...
125 ... set(modify,fuse,replace) - group(modify/fuse) - ...
126 ... set(modify,fuse,replace) - *group(replace/fuse) - ...
127 ... set(modify,fuse,replace) - *group(remove)
128 ... set(modify,fuse,replace) - set(modify/fuse) - ...
129 ... set(modify,fuse,replace) - *set(replace/fuse) - ...
130 ... set(modify,fuse,replace) - *set(remove)
131 Legend: "...": zero or more further items
132 "- ...": one or more further items
133 "modify,fuse" etc.: any of those operations
134 "modify/fuse": a modify or a fuse on an existing member
135 "replace/fuse": a replace or a fuse on a non-existing member