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Commit ce127e1

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Add command + update decorator pattern.
1 parent 2b6ad35 commit ce127e1

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16 files changed

+445
-27
lines changed

16 files changed

+445
-27
lines changed

‎Command/Calculator.cs‎

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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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namespace DoFactory.GangOfFour.Command.RealWorld
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{
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/// <summary>
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/// The 'Receiver' class
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/// </summary>
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class Calculator
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{
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private int _curr = 0;
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public void Operation(char @operator, int operand)
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{
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switch (@operator)
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{
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case '+': _curr += operand; break;
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case '-': _curr -= operand; break;
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case '*': _curr *= operand; break;
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case '/': _curr /= operand; break;
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}
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Console.WriteLine(
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"Current value = {0,3} (following {1} {2})",
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_curr, @operator, operand);
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}
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}
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}

‎Command/Command.csproj‎

Lines changed: 9 additions & 2 deletions
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@@ -7,7 +7,7 @@
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<ProjectGuid>{6DA0F093-5190-4814-8729-C9FEABCB4DDF}</ProjectGuid>
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<OutputType>Exe</OutputType>
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<AppDesignerFolder>Properties</AppDesignerFolder>
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<RootNamespace>Command</RootNamespace>
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<RootNamespace>DoFactory.GangOfFour.Command.RealWorld</RootNamespace>
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<AssemblyName>Command</AssemblyName>
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<TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
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<FileAlignment>512</FileAlignment>
@@ -42,12 +42,19 @@
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<Reference Include="System.Xml" />
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</ItemGroup>
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<ItemGroup>
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<Compile Include="Program.cs" />
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<Compile Include="Calculator.cs" />
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<Compile Include="Command\CalculatorCommand.cs" />
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<Compile Include="Command\Command.cs" />
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<Compile Include="Program.RealWordCode.cs" />
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<Compile Include="Properties\AssemblyInfo.cs" />
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<Compile Include="User.cs" />
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</ItemGroup>
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<ItemGroup>
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<None Include="App.config" />
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</ItemGroup>
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<ItemGroup>
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<Content Include="command.gif" />
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</ItemGroup>
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<Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
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<!-- To modify your build process, add your task inside one of the targets below and uncomment it.
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Other similar extension points exist, see Microsoft.Common.targets.

‎Command/Command/CalculatorCommand.cs‎

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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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namespace DoFactory.GangOfFour.Command.RealWorld
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{
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/// <summary>
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/// The 'ConcreteCommand' class
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/// </summary>
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class CalculatorCommand : Command
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{
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private char _operator;
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private int _operand;
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private Calculator _calculator;
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// Constructor
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public CalculatorCommand(Calculator calculator,
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char @operator, int operand)
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{
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this._calculator = calculator;
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this._operator = @operator;
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this._operand = operand;
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}
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// Gets operator
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public char Operator
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{
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set { _operator = value; }
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}
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// Get operand
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public int Operand
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{
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set { _operand = value; }
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}
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// Execute new command
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public override void Execute()
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{
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_calculator.Operation(_operator, _operand);
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}
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// Unexecute last command
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public override void UnExecute()
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{
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_calculator.Operation(Undo(_operator), _operand);
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}
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// Returns opposite operator for given operator
54+
private char Undo(char @operator)
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{
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switch (@operator)
57+
{
58+
case '+': return '-';
59+
case '-': return '+';
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case '*': return '/';
61+
case '/': return '*';
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default:
63+
throw new
64+
ArgumentException("@operator");
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}
66+
}
67+
}
68+
}

‎Command/Command/Command.cs‎

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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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namespace DoFactory.GangOfFour.Command.RealWorld
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{
9+
10+
/// <summary>
11+
/// The 'Command' abstract class
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/// </summary>
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abstract class Command
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{
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public abstract void Execute();
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public abstract void UnExecute();
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}
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}

‎Command/Program.RealWordCode.cs‎

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using System;
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using System.Collections.Generic;
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namespace DoFactory.GangOfFour.Command.RealWorld
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{
7+
/// <summary>
8+
/// MainApp startup class for Real-World
9+
/// Command Design Pattern.
10+
/// </summary>
11+
class MainApp
12+
{
13+
/// <summary>
14+
/// Entry point into console application.
15+
/// </summary>
16+
static void Main()
17+
{
18+
// Create user and let her compute
19+
User user = new User();
20+
21+
// User presses calculator buttons
22+
user.Compute('+', 100);
23+
user.Compute('-', 50);
24+
user.Compute('*', 10);
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user.Compute('/', 2);
26+
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// Undo 4 commands
28+
user.Undo(4);
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// Redo 3 commands
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user.Redo(3);
32+
33+
// Wait for user
34+
Console.ReadKey();
35+
}
36+
}
37+
}
38+
/*
39+
OUTPUT:
40+
Current value = 100(following + 100)
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Current value = 50(following - 50)
42+
Current value = 500(following * 10)
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Current value = 250(following / 2)
44+
45+
---- Undo 4 levels
46+
Current value = 500 (following* 2)
47+
Current value = 50(following / 10)
48+
Current value = 100(following + 50)
49+
Current value = 0(following - 100)
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51+
---- Redo 3 levels
52+
Current value = 100 (following + 100)
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Current value = 50(following - 50)
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Current value = 500(following * 10)
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*/

‎Command/Program.cs‎

Lines changed: 0 additions & 15 deletions
This file was deleted.

‎Command/User.cs‎

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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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7+
namespace DoFactory.GangOfFour.Command.RealWorld
8+
{
9+
/// <summary>
10+
/// The 'Invoker' class
11+
/// </summary>
12+
class User
13+
{
14+
// Initializers
15+
private Calculator _calculator = new Calculator();
16+
private List<Command> _commands = new List<Command>();
17+
private int _current = 0;
18+
19+
public void Redo(int levels)
20+
{
21+
Console.WriteLine("\n---- Redo {0} levels ", levels);
22+
// Perform redo operations
23+
for (int i = 0; i < levels; i++)
24+
{
25+
if (_current < _commands.Count - 1)
26+
{
27+
Command command = _commands[_current++];
28+
command.Execute();
29+
}
30+
}
31+
}
32+
33+
public void Undo(int levels)
34+
{
35+
Console.WriteLine("\n---- Undo {0} levels ", levels);
36+
// Perform undo operations
37+
for (int i = 0; i < levels; i++)
38+
{
39+
if (_current > 0)
40+
{
41+
Command command = _commands[--_current] as Command;
42+
command.UnExecute();
43+
}
44+
}
45+
}
46+
47+
public void Compute(char @operator, int operand)
48+
{
49+
// Create command operation and execute it
50+
Command command = new CalculatorCommand(
51+
_calculator, @operator, operand);
52+
command.Execute();
53+
54+
// Add command to undo list
55+
_commands.Add(command);
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_current++;
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}
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}
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}

‎Command/command.gif‎

5.56 KB
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‎Decorator/Book.cs‎

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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
6+
7+
namespace DoFactory.GangOfFour.Decorator.RealWorld
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{
9+
/// <summary>
10+
/// The 'ConcreteComponent' class
11+
/// </summary>
12+
public class Book : LibraryItem
13+
{
14+
private string _author;
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private string _title;
16+
17+
// Constructor
18+
public Book(string author, string title, int numCopies)
19+
{
20+
this._author = author;
21+
this._title = title;
22+
this.NumCopies = numCopies;
23+
}
24+
25+
public override void Display()
26+
{
27+
Console.WriteLine("\nBook ------ ");
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Console.WriteLine(" Author: {0}", _author);
29+
Console.WriteLine(" Title: {0}", _title);
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Console.WriteLine(" # Copies: {0}", NumCopies);
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}
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}
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}

‎Decorator/Borrowable.cs‎

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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
5+
using System.Threading.Tasks;
6+
7+
namespace DoFactory.GangOfFour.Decorator.RealWorld
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{
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/// <summary>
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/// The 'ConcreteDecorator' class
11+
/// </summary>
12+
public class Borrowable : Decorator
13+
{
14+
protected List<string> borrowers = new List<string>();
15+
16+
// Constructor
17+
public Borrowable(LibraryItem libraryItem)
18+
: base(libraryItem)
19+
{
20+
21+
}
22+
23+
public void BorrowItem(string name)
24+
{
25+
borrowers.Add(name);
26+
libraryItem.NumCopies--;
27+
}
28+
29+
public void ReturnItem(string name)
30+
{
31+
borrowers.Remove(name);
32+
libraryItem.NumCopies++;
33+
}
34+
35+
public override void Display()
36+
{
37+
base.Display();
38+
foreach (string borrower in borrowers)
39+
{
40+
Console.WriteLine(" borrower: " + borrower);
41+
}
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}
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}
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}

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