Items - DoCustomActionForItem

core/src/Item.cs

@@ -11,5 +11,14 @@ protected Item()
         }
 
         public abstract string ShortDescription { get; }
+
+        public void Do(MessageBus bus, Word verb, Word noun)
+        {
+            this.DoCore(bus, verb, noun);
+        }
+
+        protected virtual void DoCore(MessageBus bus, Word verb, Word noun)
+        {
+        }
     }
 }

core/src/Items.cs

@@ -13,12 +13,19 @@ public sealed class Items
         private readonly MessageBus bus;
         private readonly Dictionary<string, Item> items;
 
+        private IDisposable sub;
+
         public Items(MessageBus bus)
         {
             this.bus = bus;
             this.items = new Dictionary<string, Item>();
         }
 
+        public void Activate()
+        {
+            this.sub = this.bus.Subscribe<SentenceMessage>(m => this.Do(m));
+        }
+
         public void Look()
         {
             foreach (string item in this.items.Values.Select(i => i.ShortDescription))
@@ -47,5 +54,10 @@ private void Output(string text)
         {
             this.bus.Send(new OutputMessage(text));
         }
+
+        private void Do(SentenceMessage sentence)
+        {
+            this.items[sentence.Noun.Primary].Do(this.bus, sentence.Verb, sentence.Noun);
+        }
     }
 }

core/test/ItemsTest.cs

@@ -5,6 +5,7 @@
 namespace Adventure.Test
 {
     using System;
+    using System.Collections.Generic;
     using FluentAssertions;
     using Xunit;
 
@@ -93,9 +94,32 @@ public void DropItemAlreadyExists()
             act.Should().Throw<InvalidOperationException>("Item 'key' already exists.");
         }
 
+        [Fact]
+        public void DoCustomActionForItem()
+        {
+            MessageBus bus = new MessageBus();
+            List<string> messages = new List<string>();
+            bus.Subscribe<OutputMessage>(m => messages.Add(m.Text));
+            Items items = new Items(bus);
+            items.Drop("ball", new TestItem());
+
+            items.Activate();
+            bus.Send(new SentenceMessage(new Word("throw", "TOSS"), new Word("ball", "BASEBALL")));
+
+            messages.Should().ContainSingle().Which.Should().Be("You threw the BASEBALL!");
+        }
+
         private sealed class TestItem : Item
         {
             public override string ShortDescription => "a test item";
+
+            protected override void DoCore(MessageBus bus, Word verb, Word noun)
+            {
+                if (verb.Primary == "throw")
+                {
+                    bus.Send(new OutputMessage($"You threw the {noun}!"));
+                }
+            }
         }
     }
 }