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authoreilers <eilers>2005-01-04 14:22:12 (UTC)
committer eilers <eilers>2005-01-04 14:22:12 (UTC)
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Add section for sorting
Diffstat (limited to 'development') (more/less context) (ignore whitespace changes)
-rw-r--r--development/pim/pim_howto/pim_howto.lyx238
1 files changed, 218 insertions, 20 deletions
diff --git a/development/pim/pim_howto/pim_howto.lyx b/development/pim/pim_howto/pim_howto.lyx
index 2b08be8..4571996 100644
--- a/development/pim/pim_howto/pim_howto.lyx
+++ b/development/pim/pim_howto/pim_howto.lyx
@@ -98,69 +98,69 @@ Abstract
The Opie-Pim API provides a powerfull access interface to the PIM (Personal
Information Management) data which contains your contact information, the
dates in your calender tool (in this paper called datebook events) and
your todo events.
Beside providing full featured access to this information, it covers the
real management of this informantion - the access of the databases - from
the user.
\layout Standard
While starting to read the automatically generated API-documentation, the
user may be confused by a lot of unneccessary classes and details which
- makes the quick start not as easy as expected.
- Due to the fact that a user who just want to access data will not need
- most of the details, this paper should help to start to be confortable
- with the details he need to solve his problems.
+ makes the quick start not as easy as possible.
+ Due to the fact that a user will not need most of the details, this paper
+ should help to start to become confortable with those details he need to
+ solve his problems.
\layout Standard
\begin_inset LatexCommand \tableofcontents{}
\end_inset
\layout Chapter
Introduction
\layout Standard
Before starting to jump into the work, we should introduce some specialities
- of the PIM API first.
+ of the PIM API, first.
To know these facts should help to avoid possible irritations and misunderstand
ings:
\layout Enumerate
The PIM-API heavily uses C++ templates (as known as generic classes), but
you don't have to understand very deeple what templates are doing and how
they work! Most of the API works without even seeing the templates.
- In some cases whe have to use them (for instance to use the factory classes)
+ In some cases whe have to use them (for instance to use the factory classes),
but this guide will provide examples which should help to find the path
through.
But it is a good idea to read some short introduction of templates to avoid
unneccessary mistakes.
\layout Enumerate
The PIM-API is split into two parts: The
\emph on
frontend
\emph default
and the
\emph on
backend.
\emph default
While the frontend provides the API for the user, the backend implements
how to access the databases and what to do with the data.
- This paper just focusses the frontend as we just want to access data.
+ As we just want to access data, this paper just focusses the frontend.
Thus, you should ignore all classes which contains something like
\begin_inset Quotes gld
\end_inset
backend
\begin_inset Quotes grd
\end_inset
in its name! Backends are just interessting for people who want to extend
or implement new possiblities about how to access databases, which will
be discussed at the end of this paper.
Currently, you just have to understand that there do exist several backends
@@ -315,25 +315,25 @@ my-app
If the database access-object is is not needed anymore, you have to remove
it by calling
\emph on
delete
\emph default
:
\layout LyX-Code
delete sourceDB;
\layout Section
-Accessing the access-object
+Accessing the Access-Object
\begin_inset LatexCommand \label{sec:Accessing-the-access-object}
\end_inset
\layout Standard
After receiving the access-object, we just have to use its API which is
mainly defined by the common base class
\series bold
OPimAccessTemplate
\series default
@@ -414,26 +414,26 @@ bool save ();
\layout LyX-Code
bool add (const T& t);
\layout LyX-Code
bool remove (const T& t);
\layout LyX-Code
bool replace (const T& t);
\layout Standard
-After receiving an access-object, we have to load the existing dataset,
- which is done by the
+After receiving an access-object, we have to load the existing dataset into
+ the backend, which is done by the
\begin_inset Quotes gld
\end_inset
load()
\begin_inset Quotes grd
\end_inset
operation.
The
\begin_inset Quotes gld
\end_inset
@@ -490,25 +490,25 @@ OPimRecordList
(see
\begin_inset LatexCommand \url{http://www.sra.uni-hannover.de/~eilers/apidocs/pim2/html/classOpie_1_1OPimRecordList.html}
\end_inset
).
\layout LyX-Code
List allRecords ();
\layout Standard
-In fact this
+In fact, this
\emph on
List
\emph default
just contains a list of uid's to take care of memory space.
As every record is identified by an unique identifaction number which is
called UID (Unique IDentification), these numbers just exists once in the
database which is currently on access! To receive the real record, you
have to use the operation
\begin_inset Quotes gld
\end_inset
find()
@@ -574,25 +574,25 @@ Advanced Factory Features
\layout Standard
In the previous chapter we used the operation
\begin_inset Quotes gld
\end_inset
defaultAccess()
\begin_inset Quotes grd
\end_inset
to request an access-object to the dafault backend.
Whether this default backend will access the XML, VCard or SQLite database
- type, this is defined by the configuration file
+ type, is defined by the configuration file
\begin_inset Quotes gld
\end_inset
pimaccess.conf
\begin_inset Quotes grd
\end_inset
which is stored in the directory
\begin_inset Quotes gld
\end_inset
Settings
@@ -606,26 +606,26 @@ Settings
defaultAccess()
\begin_inset Quotes grd
\end_inset
.
Therefore it is not a good idea to modify a global setting, if an application
should access a special database type, for instance to move data from one
database to an other.
\layout Standard
-If the developer wants to select a special database type for sure, he has
- to use the oparation
+If the developer wants to select a special database type for sure without
+ unnecessary side effects, he has to use the oparation
\emph on
create()
\emph default
which has the following parameters:
\layout LyX-Code
T * create (OPimGlobal::PimType type, OPimGlobal::DatabaseStyle dbStyle,
const QString &appName, const QString &fileName=QString::null)
\layout Standard
Some paramters are already known, like type and appName (see section
\begin_inset LatexCommand \ref{sec:Instantiate-the-Access}
@@ -750,25 +750,25 @@ In most cases it is not sufficient to receive just a list of all information
searching and sorting in an incremental manner
\begin_inset Foot
collapsed true
\layout Standard
FIXME: matchRegexp() does take a list of uid's.
Therefore it is currently not possible to use it in an incremental manner!
(se)
\end_inset
.
- Therfore it is possible to research a
+ Therefore it is possible to research a
\begin_inset Quotes gld
\end_inset
List
\begin_inset Quotes grd
\end_inset
which was returned by a previous search query and to sort it afterwards.
Before we will take a close look into sorting, we will start with searching.
There exist two different ways of searching:
\layout Enumerate
@@ -909,50 +909,59 @@ Eilers
searchQuery.setHomeZip(
\begin_inset Quotes gld
\end_inset
3*
\begin_inset Quotes grd
\end_inset
);
\layout Standard
-We use a usual
+We use an usual
\begin_inset Quotes gld
\end_inset
OPimContact
\begin_inset Quotes grd
\end_inset
- and fill into two fields the search information.
+ and fill into two fields the query information.
+ All filled fields are taken for the search operation (using an
+\begin_inset Quotes gld
+\end_inset
+
+AND
+\begin_inset Quotes grd
+\end_inset
+
+ operation), the unused ones are simply ignored.
As we just want to search for entries which zip number starts with a
\begin_inset Quotes gld
\end_inset
3
\begin_inset Quotes grd
\end_inset
we use the Wildcard
\begin_inset Quotes gld
\end_inset
*
\begin_inset Quotes grd
\end_inset
- as we would do for finding files in a filesystem.
+ as we would do to find files in a filesystem.
\layout Standard
The next step is to put this query into the operation which is defined like
this:
\layout LyX-Code
List queryByExample (const T& query, int querySettings, const QDateTime
&startperiod=QDateTime())
\layout Standard
The first parameter
\begin_inset Quotes gld
@@ -1010,25 +1019,25 @@ eilers
\begin_inset Quotes grd
\end_inset
,
\begin_inset Quotes gld
\end_inset
eIlers
\begin_inset Quotes grd
\end_inset
, ...).
- Thus we have to use the
+ Thus, we have to use the
\begin_inset Quotes gld
\end_inset
IgnoreCase
\begin_inset Quotes grd
\end_inset
setting which is to combine with the other using an
\begin_inset Quotes gld
\end_inset
or
@@ -1048,25 +1057,25 @@ endperiod
\layout LyX-Code
use namespace Opie;
\layout LyX-Code
[...]
\layout LyX-Code
List found_items = queryByExample( searchQuery, OPimBase::WildCards | OpimBase::
IgnoreCase );
\layout Standard
-This operation may return a list of entries which can be accesses as usual,
+This operation may return a list of entries which can be accessed as above,
using the
\begin_inset Quotes gld
\end_inset
find()
\begin_inset Quotes grd
\end_inset
operation.
\layout Standard
It should be clear at this stage, that this query is very powerful and -
@@ -1164,24 +1173,213 @@ OPimBase::DateDiff
\begin_inset Quotes grd
\end_inset
.
The date and time in the query object is used as the
\series bold
end
\series default
of the interval.
The start will be defined by the last parameter (if nothing is set, the
current date will be taken!).
Therefore, it is possible to set a time frame for all searched entries.
+\layout Standard
+
+If you want to do incremental search operations, you may use the special
+
+\begin_inset Quotes gld
+\end_inset
+
+queryByExample()
+\begin_inset Quotes grd
+\end_inset
+
+ which takes a
+\begin_inset Quotes gld
+\end_inset
+
+List
+\begin_inset Quotes grd
+\end_inset
+
+ as the first parameter.
+ The search operation will just occure on this set of uid's!
+\layout Subsection
+
+Sorting
+\layout Standard
+
+To sort a given dataset, you should use the following operation (or one
+ of the others which behave slightly differently):
+\layout LyX-Code
+
+List sorted (const List& list, bool ascending, int sortOrder, int sortFilter,
+ const QArray< UID >& cats);
+\layout Standard
+
+This sort operation takes a list of uid's as returned for instance from
+ a search query.
+ The parameter
+\begin_inset Quotes gld
+\end_inset
+
+ascending
+\begin_inset Quotes grd
+\end_inset
+
+ defines whether the sort should be in an ascending order or not.
+
+\begin_inset Quotes gld
+\end_inset
+
+sortOrder
+\begin_inset Quotes grd
+\end_inset
+
+ is defined by the enumerations
+\begin_inset Quotes gld
+\end_inset
+
+SortOrder
+\begin_inset Quotes grd
+\end_inset
+
+ and
+\begin_inset Quotes gld
+\end_inset
+
+SortOrderBase
+\begin_inset Quotes grd
+\end_inset
+
+ and defines which field should be used to sort (see for
+\series bold
+OPimContactAccess
+\series default
+:
+\begin_inset LatexCommand \url{http://www.sra.uni-hannover.de/~eilers/apidocs/pim2/html/classOpie_1_1OPimContactAccess.html}
+
+\end_inset
+
+, for
+\series bold
+ODateBookAccess
+\series default
+:
+\begin_inset LatexCommand \url{http://www.sra.uni-hannover.de/~eilers/apidocs/pim2/html/classOpie_1_1ODateBookAccess.html}
+
+\end_inset
+
+ and for
+\series bold
+OPimTodoAccess
+\series default
+:
+\begin_inset LatexCommand \url{http://www.sra.uni-hannover.de/~eilers/apidocs/pim2/html/classOpie_1_1OPimTodoAccess.html}
+
+\end_inset
+
+ and for common settings
+\begin_inset LatexCommand \url{http://www.sra.uni-hannover.de/~eilers/apidocs/pim2/html/structOpie_1_1OPimBase.html#w21}
+
+\end_inset
+
+).
+\layout Standard
+
+The
+\begin_inset Quotes gld
+\end_inset
+
+sortFilter
+\begin_inset Quotes grd
+\end_inset
+
+ parameter allows to remove some entries which are not interesting for the
+ result and is defined in the same classes as
+\begin_inset Quotes gld
+\end_inset
+
+sortOrder
+\begin_inset Quotes grd
+\end_inset
+
+ by the enumeration
+\begin_inset Quotes gld
+\end_inset
+
+SortFilter
+\begin_inset Quotes grd
+\end_inset
+
+ and
+\begin_inset Quotes gld
+\end_inset
+
+SortFilterBase
+\begin_inset Quotes grd
+\end_inset
+
+.
+ The list of id's in
+\begin_inset Quotes gld
+\end_inset
+
+cats
+\begin_inset Quotes grd
+\end_inset
+
+ allows to remain just these entries which are included in the list of categorie
+s.
+\layout Standard
+
+The returned list contains the same uid's as given via
+\begin_inset Quotes gld
+\end_inset
+
+list
+\begin_inset Quotes grd
+\end_inset
+
+ (or a subset of it, as the sortFilter and category list removes some entries)
+ with a modified order as
+\begin_inset Quotes gld
+\end_inset
+
+sortOrder
+\begin_inset Quotes grd
+\end_inset
+
+ and
+\begin_inset Quotes gld
+\end_inset
+
+ascending
+\begin_inset Quotes grd
+\end_inset
+
+ dictates.
+\layout Standard
+
+Therefore
+\begin_inset Quotes gld
+\end_inset
+
+sorted()
+\begin_inset Quotes grd
+\end_inset
+
+ is more a combination of search and sort, as just a sort command.
+ But this combination is exactly what the developer needs in most situations.
+
\layout Section
Generic Access: OPimBase and OPimRecord
\begin_inset LatexCommand \label{sec:Generic-Access:-OPimBase}
\end_inset
\layout Section
Caching
\layout Standard