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<!DOCTYPE concept
  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
<concept id="GUID-40E64445-CBA3-59E4-A777-937609B311C9" xml:lang="en"><title>Contacts
Model Overview</title><prolog><metadata><keywords/></metadata></prolog><conbody>
<section id="GUID-C4F81B43-D09B-45AE-A616-B77398345918"><title>Purpose</title> <p>The purpose of this document is to give
guidelines on how to use the Contacts Model API most efficiently for a range
of typical operations. The Contacts Model is an engine component that provides
access to contact information stored on a device. Just like a real-world address
book it stores and organises names, telephone numbers, addresses and other
details of individuals and companies. It can be used to add, delete and edit
data as well as providing information to clients, and sorting and searching
contacts. </p> </section>
<section id="GUID-FE10E5CD-4F10-400D-AFDC-A00DDC22F6C7"><title>Architectural Relationships</title> <p>The Contacts Model
is primarily used by messaging, telephony, synchronisation and vCard viewer
clients on a device. </p> <fig id="GUID-79192704-415D-530B-8FEB-F73A5C93D0C2">
<title>              CONTACTS MODEL CLIENTS            </title>
<image href="GUID-5B6634EA-EB78-504E-BC5D-ABA67EEA06DF_d0e123175_href.png" placement="inline"/>
</fig> </section>
<section id="GUID-DF37BEEF-CF1D-42B4-A5E2-B3C8F69B33BD"><title>Description</title> <p>The <xref href="GUID-6A6C7B3B-1E44-3731-956D-590A1122FF6E.dita"><apiname>CContactDatabase</apiname></xref> class
allows clients access to the contact data stored on the device and has the
following functionality: </p> <p><b>Contact database management </b> </p> <p>More than one Contact Database
can exist on a phone, but a default Contact Database is used if no other is
specified. Clients can open, close, alter and delete the Contact Database.
Extra databases can be added as required. The Contact Database can be moved
between drives, and can be compressed in order to save space. </p> <p><b>Contact items management </b> </p> <p>Contact Items are made up of Contact
Fields and can be added to and removed from the database. Items in the database
can be opened, read, sorted and deleted. An item must be opened before it
can be edited. Editing an item often means altering data in one or more fields,
such as name or telephone number. To provide different sorting views Contact
Items can be grouped in categories such as ‘colleagues’ or ‘family’. </p> <p><b>Searching the database </b> </p> <p>Searching <xref href="GUID-6A6C7B3B-1E44-3731-956D-590A1122FF6E.dita"><apiname>CContactDatabase</apiname></xref> implements
searching and sorting and also provides separate phone number matching functions.
These provide a fast way of indexing and looking up phone numbers, for example,
for looking up caller IDs on incoming calls. </p> <p><b>Speed dial functionality </b> </p> <p>The database owns speed dial information.
This is a mapping between a single digit integer and a telephone number. There
may be up to nine speed dial telephone numbers. If a Contact Item is deleted,
its speed dial mapping is removed. </p> <p><b>Notification of changes </b> </p> <p>The database needs to be informed
of data changes made to it. Sometimes a UI-level application may need to respond
to updates made by other clients. The Contacts Model provides an observer
to transmit this information between <xref href="GUID-6A6C7B3B-1E44-3731-956D-590A1122FF6E.dita"><apiname>CContactDatabase</apiname></xref> instances. </p> </section>
</conbody></concept>