Iterator

PatternsComportamentais/Iterator/Aggregate.cs

@@ -0,0 +1,9 @@
+using System;
+
+namespace Iterator
+{
+    public abstract class Aggregate
+    {
+        public abstract Iterator CreateIterator();
+    }
+}

PatternsComportamentais/Iterator/ConcretAggregate.cs

@@ -0,0 +1,26 @@
+using System;
+using System.Collections;
+
+namespace Iterator
+{
+    public class ConcretAggregate : Aggregate
+    {
+
+        private ArrayList _items = new ArrayList();
+        public override Iterator CreateIterator()
+        {
+            return new ConcretIterator(this);
+        }
+
+        public int Count
+        {
+            get { return _items.Count; }
+        }
+
+        public object this[int index]
+        {
+            get { return _items[index]; }
+            set { _items.Insert(index, value); }
+        }
+    }
+}

PatternsComportamentais/Iterator/ConcretIterator.cs

@@ -0,0 +1,39 @@
+using System;
+
+namespace Iterator
+{
+    public class ConcretIterator : Iterator
+    {
+        private ConcretAggregate _aggregate;
+        private int _current = 0;
+
+        public ConcretIterator(ConcretAggregate aggregate)
+        {
+            this._aggregate = aggregate;
+        }
+
+        public override object CurrentItem()
+        {
+            return _aggregate[_current];
+        }
+
+        public override object First()
+        {
+            return _aggregate[0];
+        }
+
+        public override bool IsDone()
+        {
+            return _current >= _aggregate.Count;
+        }
+
+        public override object Next()
+        {
+            object ret = null;
+            if (_current < _aggregate.Count - 1)
+                ret = _aggregate[++_current];
+
+            return ret;
+        }
+    }
+}

PatternsComportamentais/Iterator/Iterator.cs

@@ -0,0 +1,12 @@
+using System;
+
+namespace Iterator
+{
+    public abstract class Iterator
+    {
+        public abstract object First();
+        public abstract object Next();
+        public abstract bool IsDone();
+        public abstract object CurrentItem();
+    }
+}

PatternsComportamentais/Iterator/Iterator.csproj

@@ -0,0 +1,8 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+  </PropertyGroup>
+
+</Project>

PatternsComportamentais/Iterator/Program.cs

@@ -0,0 +1,29 @@
+using System;
+
+namespace Iterator
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            ConcretAggregate a = new ConcretAggregate();
+
+            a[0] = "Item A";
+            a[1] = "Item B";
+            a[2] = "Item C";
+            a[3] = "Item D";
+
+            Iterator i = a.CreateIterator();
+
+            Console.WriteLine("Iteragindo com a coleção: ");
+
+            object item = i.First();
+
+            while (item!=null)
+            {
+                Console.WriteLine(item);
+                item = i.Next();
+            }
+        }
+    }
+}

PatternsComportamentais/PatternsComportamentais.sln

@@ -9,6 +9,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Command", "Command\Command.
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Interpreter", "Interpreter\Interpreter.csproj", "{3854DE72-2962-43F0-8E6C-3112F6AEE85A}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Iterator", "Iterator\Iterator.csproj", "{DDA2348A-5257-4E65-9400-2C95DE6F6514}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -27,6 +29,10 @@ Global
 		{3854DE72-2962-43F0-8E6C-3112F6AEE85A}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{3854DE72-2962-43F0-8E6C-3112F6AEE85A}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{3854DE72-2962-43F0-8E6C-3112F6AEE85A}.Release|Any CPU.Build.0 = Release|Any CPU
+		{DDA2348A-5257-4E65-9400-2C95DE6F6514}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{DDA2348A-5257-4E65-9400-2C95DE6F6514}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{DDA2348A-5257-4E65-9400-2C95DE6F6514}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{DDA2348A-5257-4E65-9400-2C95DE6F6514}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE