Refactor FlagMetadata class to inherit from BaseMetadata

Signed-off-by: André Silva <[email protected]>

src/OpenFeature/Model/BaseMetadata.cs

@@ -0,0 +1,57 @@
+using System;
+using System.Collections.Generic;
+using System.Collections.Immutable;
+
+#nullable enable
+namespace OpenFeature.Model;
+
+public abstract class BaseMetadata
+{
+    private readonly ImmutableDictionary<string, object> _metadata;
+
+    internal BaseMetadata(Dictionary<string, object> metadata)
+    {
+        this._metadata = metadata.ToImmutableDictionary();
+    }
+
+    internal BaseMetadata() : this([])
+    {
+    }
+
+    public virtual bool? GetBool(string key)
+    {
+        return this.GetValue<bool>(key);
+    }
+
+    public virtual int? GetInt(string key)
+    {
+        return this.GetValue<int>(key);
+    }
+
+    public virtual double? GetDouble(string key)
+    {
+        return this.GetValue<double>(key);
+    }
+
+    public virtual string? GetString(string key)
+    {
+        var hasValue = this._metadata.TryGetValue(key, out var value);
+        if (!hasValue)
+        {
+            return null;
+        }
+
+        return value as string ?? throw new InvalidCastException($"Cannot cast {value?.GetType()} to {typeof(string)}");
+    }
+
+    private T? GetValue<T>(string key) where T : struct
+    {
+        var hasValue = this._metadata.TryGetValue(key, out var value);
+        if (!hasValue)
+        {
+            return null;
+        }
+
+        return value is T tValue ? tValue : throw new InvalidCastException($"Cannot cast {value?.GetType()} to {typeof(T)}");
+    }
+}

src/OpenFeature/Model/FlagMetadata.cs

@@ -5,53 +5,13 @@
 #nullable enable
 namespace OpenFeature.Model;
 
-public sealed class FlagMetadata
+public sealed class FlagMetadata : BaseMetadata
 {
-    private readonly ImmutableDictionary<string, object> _metadata;
-
-    public FlagMetadata(Dictionary<string, object> metadata)
-    {
-        this._metadata = metadata.ToImmutableDictionary();
-    }
-
-    public FlagMetadata() : this([])
-    {
-    }
-
-    public bool? GetBool(string key)
-    {
-        return this.GetValue<bool>(key);
-    }
-
-    public int? GetInt(string key)
+    public FlagMetadata()
     {
-        return this.GetValue<int>(key);
     }
 
-    public double? GetDouble(string key)
+    public FlagMetadata(Dictionary<string, object> metadata) : base(metadata)
     {
-        return this.GetValue<double>(key);
-    }
-
-    public string? GetString(string key)
-    {
-        var hasValue = this._metadata.TryGetValue(key, out var value);
-        if (!hasValue)
-        {
-            return null;
-        }
-
-        return value as string ?? throw new InvalidCastException($"Cannot cast {value?.GetType()} to {typeof(string)}");
-    }
-
-    private T? GetValue<T>(string key) where T : struct
-    {
-        var hasValue = this._metadata.TryGetValue(key, out var value);
-        if (!hasValue)
-        {
-            return null;
-        }
-
-        return value is T tValue ? tValue : throw new InvalidCastException($"Cannot cast {value?.GetType()} to {typeof(T)}");
     }
 }