Design Patterns in .Net

Oct 26, 20092 likes1,267 views

This document discusses several object-oriented programming concepts including: 1. The Singleton pattern which ensures a class has only one instance. It provides a global point of access to the instance. 2. State pattern which allows an object's behavior to change based on its internal state. Context objects delegate work to state objects to change behavior at runtime. 3. Strategy pattern which defines a family of algorithms, puts each of them in a separate class, and makes their objects interchangeable. This allows selection of algorithms at runtime based on context.

public class C {
public C() { … }
}

public class C {
public static C NewC() {
return new C();
}
}

class PersonFactory {
public Person MakePerson(
int age)
{
if (age < 18)
return new Minor();
else
return new Adult();
}
}

string.Format(
“<person name=”{0}”,
name)

XElement(“person”,
XAttribute(“name”, name))
.ToString();

StringBuilder AppendFormat()
AppendLine()

Util.AppendFormatLine(stringBuilder, format, params)

stringBuilder.AppendFormatLine(format, params)

stringBuilder.AppendFormat(“… {0}”, params,
Environment.NewLine)

MemberwizeClone

ICloneable
Clone()

ToString() GetHashCode()

[Serializable]
public abstract class IPrototype<T>
{
public T DeepCopy()
{
MemoryStream stream = new MemoryStream();
BinaryFormatter formatter = new BinaryFormatter();
formatter.Serialize(stream, this);
stream.Seek(0, SeekOrigin.Begin);
T copy = (T)formatter.Deserialize(stream);
stream.Close();
return copy;
}
}

DeepCopy
IPrototype<T>



WeakReference

public class C
{
private C() { /* nothing here */ }

class CMaker {
static CMaker () { }
internal static readonly C instance = new C();
}

public static C Instance {
get { return CMaker.instance; }
}
}

Random
class RandomGenerator {
public Random GetRandom() {
return new Random(); // not what I want
}
}

interface IRandom {
int RandomNumber();
}

RandomGenerator
IRandom

class RandomAdapter:
RandomGenerator, IRandom
{
int RandomNumber() {
return GetRandom().Next();
}
}

– RandomGenerator rg = new RandomGenerator();
Random r = rg.GetRandom();

– IRandom rand = new Adapter();
int n = rand.RandomNumber();

– class C { … }
– class CCollection : Collection<C> { … }

class CContainer {
private Collection<C> items;
}

class Neuron
{ … }

class Layer :
Collection<Neuron>
{ … }

neuron.ConnectTo(otherNeuron);
neuron.ConnectTo(layer);
layer.ConnectTo(neuron);
layer.ConnectTo(otherLayer);

– IEnumerable<T>
yield return this;

ICollection<T>

Card CardInPlay

♣ ♠ ♥ ♦

Rank
Suit
Rank
Suit
Orientation

IEnumerable<T>
yield return
GetEnumerator()

AsyncEnumerator

interface ICarState
{
void Go(Context ctx); // Drive?
}

class Context {
ICarState state;
public void GoGoGo() {
state.Go(this);
state.Go(this); // yeah, right :)
state.Go(this);
}
}

class CrashedState : class MovingState :
ICarState ICarState
{ {
void Go(Context ctx) void Go(Context ctx)
{ {
MessageBox.Show( // driving
“Are you crazy?”); // is that a rock?
}
} // CRASH!
The state ctx.state =
just new CrashedState();
changed! }
}

interface IStrategy
{
void Evaluate(Context ctx);
}

SingleEvaluator, ParralelEvaluator,
GpuEvaluator

class Context {
IStrategy strategy;
Matrix m1, m2;
static void Multiply(Matrix m1, Matrix m2)
{ this.m1 = m1; this.m2 = m2;
if (strategy == null) { // on-demand
if (gpu.pixelShader >= 2.0)
strategy = new GpuStrategy();
else if (Environment.ProcessorCount > 1)
strategy = new ParallelStrategy();
else strategy = new SingleStrategy();
}
strategy.Evaluate(this);
}
}

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Modify HuffmanTree.java and HuffmanNode.java to allow the user to select the value of n 9 to construct an n ary Huffman Tree. Once finished, verify the accuracy of your tree by running it for the English Alphabet for n = 3, 4, 5, 6, 7, 8, 9. For each value of n, compute the average codeword length. Write these in a table (n vs. ACW L(Cn)). / HuffmanTree.java import java.io.FileNotFoundException; import java.io.FileReader; import java.util.ArrayList; import java.util.Scanner; public class HuffmanTree { public static void main(String[] args){ Scanner in = new Scanner(System.in); System.out.print(\"Enter the file name: \"); String fileName = in.nextLine(); ArrayList nodes = new ArrayList<>(); ArrayList temp = new ArrayList<>(); try { Scanner fin = new Scanner(new FileReader(fileName)); String symbol; double prob; while(fin.hasNext()){ symbol = fin.next(); prob = fin.nextDouble(); nodes.add(findInsertIndex(nodes, prob), new HuffmanNode(symbol, prob)); } fin.close(); temp.addAll(nodes); HuffmanNode root = createHuffmanTree(temp); setCodeWords(root); double avg = 0; for (HuffmanNode node : nodes) { System.out.println(node.getS() + \": \" + node.getC() + \": \" + node.getL()); avg += node.getL(); } if(avg != 0) avg /= nodes.size(); System.out.println(\"Average code length is: \" + avg); } catch (FileNotFoundException e) { e.printStackTrace(); } } private static HuffmanNode createHuffmanTree(ArrayList nodes){ HuffmanNode root = null; if(nodes.size() > 0) { HuffmanNode node0, node1, node; while (nodes.size() > 1) { node0 = nodes.get(0); node1 = nodes.get(1); node = new HuffmanNode(null, node0.getP() + node1.getP()); node.setLeft(node0); node.setRight(node1); nodes.remove(0); nodes.remove(0); nodes.add(findInsertIndex(nodes, node.getP()), node); } root = nodes.get(0); } return root; } private static void setCodeWords(HuffmanNode root){ if(root != null){ setCodeWords(root, \"\"); } } private static void setCodeWords(HuffmanNode root, String codeWord){ if(root.getS() != null){ root.setC(codeWord); root.setL(codeWord.length()); } else{ setCodeWords(root.getLeft(), codeWord + \"0\"); setCodeWords(root.getRight(), codeWord + \"1\"); } } private static int findInsertIndex(ArrayList nodes, double prob){ for(int i = 0; i < nodes.size(); ++i){ if(prob < nodes.get(i).getP()){ return i; } } return nodes.size(); } } // HuffmanNode.java public class HuffmanNode { private String S; private double P; private String C; private int L; private HuffmanNode left, right; public HuffmanNode(String s, double p) { S = s; P = p; } public String getS() { return S; } public void setS(String s) { S = s; } public double getP() { return P; } public void setP(double p) { P = p; } public String getC() { return C; } public void setC(String c) { C = c; } public int getL() { return L; } public void setL(int l) { L = l; } public HuffmanNode getLeft() { return left; } public void setLeft(HuffmanNode left) { this.left = left; } public HuffmanNode getRight() { return right; } public void se.

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This Java code defines classes for a money transfer application on a mobile device. It includes classes to handle registration, login, viewing account details, and transferring money between accounts by connecting to a backend server via HTTP requests. User interface elements like text fields, forms, images and lists are created to display registration/login screens, account information, and menus to select different actions.

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Design Patterns in .Net

8. System.Activator

9. public class C { public C() { … } } public class C { public static C NewC() { return new C(); } }

10. private base() this()

11. class PersonFactory { public Person MakePerson( int age) { if (age < 18) return new Minor(); else return new Adult(); } }

12. string.Format( “<person name=”{0}”, name) XElement(“person”, XAttribute(“name”, name)) .ToString();

14. StringBuilder AppendFormat() AppendLine() Util.AppendFormatLine(stringBuilder, format, params) stringBuilder.AppendFormatLine(format, params) stringBuilder.AppendFormat(“… {0}”, params, Environment.NewLine)

16. MemberwizeClone ICloneable Clone() ToString() GetHashCode()

17. [Serializable] public abstract class IPrototype<T> { public T DeepCopy() { MemoryStream stream = new MemoryStream(); BinaryFormatter formatter = new BinaryFormatter(); formatter.Serialize(stream, this); stream.Seek(0, SeekOrigin.Begin); T copy = (T)formatter.Deserialize(stream); stream.Close(); return copy; } }

18. DeepCopy IPrototype<T>   WeakReference

19. new

20. public class C { private C() { /* nothing here */ } class CMaker { static CMaker () { } internal static readonly C instance = new C(); } public static C Instance { get { return CMaker.instance; } } }

21. x:Static

24. Random class RandomGenerator { public Random GetRandom() { return new Random(); // not what I want } } interface IRandom { int RandomNumber(); }

25. RandomGenerator IRandom class RandomAdapter: RandomGenerator, IRandom { int RandomNumber() { return GetRandom().Next(); } }

26. – RandomGenerator rg = new RandomGenerator(); Random r = rg.GetRandom(); – IRandom rand = new Adapter(); int n = rand.RandomNumber();

28. – class C { … } – class CCollection : Collection<C> { … } class CContainer { private Collection<C> items; }

29. class Neuron { … } class Layer : Collection<Neuron> { … } neuron.ConnectTo(otherNeuron); neuron.ConnectTo(layer); layer.ConnectTo(neuron); layer.ConnectTo(otherLayer);

30. – IEnumerable<T> yield return this; ICollection<T>

32. Card CardInPlay ♣ ♠ ♥ ♦ Rank Suit Rank Suit Orientation

34. IA IB A B

36. → →

38. new Bitmap byte[]

39. Reflection.Emit

44. XElement.Parse →

45. IEnumerable<T> yield return GetEnumerator() AsyncEnumerator

49. → →

51. interface ICarState { void Go(Context ctx); // Drive? }

52. class Context { ICarState state; public void GoGoGo() { state.Go(this); state.Go(this); // yeah, right :) state.Go(this); } }

53. class CrashedState : class MovingState : ICarState ICarState { { void Go(Context ctx) void Go(Context ctx) { { MessageBox.Show( // driving “Are you crazy?”); // is that a rock? } } // CRASH! The state ctx.state = just new CrashedState(); changed! } }

56. interface IStrategy { void Evaluate(Context ctx); } SingleEvaluator, ParralelEvaluator, GpuEvaluator

57. class Context { IStrategy strategy; Matrix m1, m2; static void Multiply(Matrix m1, Matrix m2) { this.m1 = m1; this.m2 = m2; if (strategy == null) { // on-demand if (gpu.pixelShader >= 2.0) strategy = new GpuStrategy(); else if (Environment.ProcessorCount > 1) strategy = new ParallelStrategy(); else strategy = new SingleStrategy(); } strategy.Evaluate(this); } }

58. → →

59. StringBuilder

62. 

Design Patterns in .Net

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