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Inheritance is an object-oriented principle that allows reusing existing code with less modification How it works is that a child class extends a base class A base class is also often referred to as the child class parent The child class can then use the base class instance variables and methods This reuse is called inheritance because child classes inherit the methods and instance variables of its ancestor classes A child classes can extend a parent class functionality And a child class can replace a parent class functionality For instance, all fruit have certain shared characteristics However, different fruit can have different characteristics that specialize a Fruit All fruits have skin, but apple, orange, and pear skins are all a little different Or consider a living

Figure 7-1

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Part VI Connecting Networks 191 from ocean waves, except for the salty water thing If you had to measure the waves in the ocean there would be two things you could record: the height of each wave 16 (amplitude) and the time between each wave (frequency) The number of surfers on Connecting Networks: the wave is irrelevant unless you happen to be a hungry shark Wireless Information can be transmitted by modulating (manipulating) the shape of Connections waves The signal starts off as a simple wave with a constant frequency and amplitude The wave can be manipulated in three basic ways: Creating pulses by turning the wave generation device on and off This is called Pulse Code Modulation (PCM) Morse code relies on this principle It uses groupings of long and short pulses to represent letters Varying the amplitude while holding the frequency constant This is called Amplitude Modulation (AM) Varying the frequency while holding the amplitude constant As you might guess, this is called Frequency Modulation (FM) Can you spot the familiar acronyms The radio can receive amplitude and frequency modulated signals, which it converts to music As everyone who has used a car radio knows, AM signals sound lousy but travel a long distance FM signals sound good, but go out of range much faster Most modern music stations broadcast using FM signals because of the extra quality AM is used for talk radio, which doesn t need the high fidelity As a result, FM and AM might as well stand for Funky Music and Awful Monologues See Figure 16-1 Why do signals go out of range Picture an empty balloon Notice that the rubber is pretty thick Now blow up the balloon The rubber gets thinner and thinner until it finally breaks and the balloon pops The strength (power) of the signal is like the.

organism Both plants and animals are living organisms and both breathe However, a plant breathes carbon dioxide and animals breathe oxygen You can model both these examples using a diagram called a class diagram

The hardware layer represents the physical hardware of the device and is wholly the responsibility of the manufacturer developing the device SymbianOS devices can currently be based on the ARMv5, ARMv6, or ARMv7 architecture, although the layered design allows for a relatively straightforward porting process to other architectures Whatever hardware SymbianOS is operating on, it is only able to take advantage of the facilities exposed through the Hardware Abstraction Layer (HAL)

The Unified Modeling Language (UML) offers a convenient syntax for modeling inheritance Figure 6-1 illustrates a simple class diagram A child class relationship with a parent class is modeled using an arrow with an open arrow The arrow points from the child to the parent In Figure 6-1, a Pear, Orange, and Apple are all children of Fruit You can also, of course, create a more detailed class diagram, much as you did in 5 (Figure 6-2) In Figure 6-2, a LivingOrganism is the parent, while Animal and Plant are children of LivingOrganism A class is modeled as a rectangle The rectangle s top compartment contains the class name The second compartment contains the class instance variables The third compartment contains the class methods Figure 6-3 illustrates another inheritance principle A child class inherits not only from its immediate parent; it also inherits from every ancestor to its root class In Figure 6-3, a Fuji s parent is Apple An Apple s parent is Fruit A Fruit s parent is NSObject NSObject is the root class A Fuji inherits from Apple, Fruit, and NSObject

The Basics:

Hardware Abstraction Layer (HAL)

A parent class is also often referred to as a superclass, and a child class is often referred to as a subclass

Objective-C implements inheritance in an object s interface The following code illustrates:

The HAL sits between the hardware and the kernel to significantly reduce the development effort required to support new platforms Hardware-specific interaction is factored into a Board Support Package (BSP) consisting of concrete implementations of several abstract interfaces consumed by the kernel In this fashion, SymbianOS can run on a wide variety of hardware platforms SymbianOS also provides a set of reference/test BSPs that OEMs can adapt to assist in the rapid development of device-specific code

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