Move location-like entities to the Semmle.Extraction.CSharp namespace

csharp/extractor/Semmle.Extraction.CSharp/Entities/Base/CachedEntityFactoryExtensions.cs

@@ -0,0 +1,35 @@
+using Microsoft.CodeAnalysis;
+
+namespace Semmle.Extraction
+{
+    public static class CachedEntityFactoryExtensions
+    {
+        /// <summary>
+        /// Creates and populates a new entity, or returns the existing one from the cache,
+        /// based on the supplied cache key.
+        /// </summary>
+        /// <typeparam name="TInit">The type used to construct the entity.</typeparam>
+        /// <typeparam name="TEntity">The type of the entity to create.</typeparam>
+        /// <param name="factory">The factory used to construct the entity.</param>
+        /// <param name="cx">The extractor context.</param>
+        /// <param name="cacheKey">The key used for caching.</param>
+        /// <param name="init">The initializer for the entity.</param>
+        /// <returns>The entity.</returns>
+        public static TEntity CreateEntity<TInit, TEntity>(this CachedEntityFactory<TInit, TEntity> factory, Context cx, object cacheKey, TInit init)
+            where TEntity : CachedEntity => cx.CreateEntity(factory, cacheKey, init);
+
+        /// <summary>
+        /// Creates and populates a new entity from an `ISymbol`, or returns the existing one
+        /// from the cache.
+        /// </summary>
+        /// <typeparam name="TSymbol">The type used to construct the entity.</typeparam>
+        /// <typeparam name="TEntity">The type of the entity to create.</typeparam>
+        /// <param name="factory">The factory used to construct the entity.</param>
+        /// <param name="cx">The extractor context.</param>
+        /// <param name="init">The initializer for the entity.</param>
+        /// <returns>The entity.</returns>
+        public static TEntity CreateEntityFromSymbol<TSymbol, TEntity>(this CachedEntityFactory<TSymbol, TEntity> factory, Context cx, TSymbol init)
+            where TSymbol : ISymbol
+            where TEntity : CachedEntity => cx.CreateEntityFromSymbol(factory, init);
+    }
+}